Sycamore CC S-4 27 Dec 13 Registration of securities issued in business combination transactions Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013
Document Information [Line Items]	'
Document Type	'S-4
Amendment Flag	'false
Document Period End Date	30-Sep-13
Trading Symbol	'WLH
Entity Registrant Name	'WILLIAM LYON HOMES
Entity Central Index Key	'0001095996
Entity Filer Category	'Non-accelerated Filer

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Scenario, Previously Reported [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Preferred stock [Member]

Preferred stock [Member]

Senior Secured Term Loan Due 2015

8 1/2% Senior Notes due November 15, 2020 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Common stock, Class A [Member]

Common stock, Class B [Member]

Common stock, Class C [Member]

Common stock, Class D [Member]

Senior Secured Term Loan Due 2015

8 1/2% Senior Notes due November 15, 2020 [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Liabilities not subject to compromise

Liabilities not subject to compromise

Liabilities subject to compromise

Liabilities subject to compromise

Liabilities subject to compromise

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Liabilities not subject to compromise

Liabilities not subject to compromise

Liabilities subject to compromise

Liabilities subject to compromise

Liabilities subject to compromise

ASSETS

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

$81,922,000

$71,075,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$20,061,000

'

'

'

'

'

'

'

'

'

Restricted cash

853,000

853,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

852,000

'

'

'

'

'

'

'

'

'

Receivables

21,655,000

14,789,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,732,000

'

'

'

'

'

'

'

'

'

Real estate inventories

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Owned

640,162,000

421,630,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

398,534,000

'

'

'

'

'

'

'

'

'

Not owned

20,738,000

[1]

39,029,000

[1],[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

47,408,000

[2]

'

'

'

'

'

'

'

'

'

Deferred loan costs, net

8,088,000

7,036,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,810,000

'

'

'

'

'

'

'

'

'

Goodwill

14,209,000

14,209,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intangibles, net of accumulated amortization

3,446,000

4,620,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other assets, net

7,880,000

7,906,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,554,000

'

'

'

'

'

'

'

'

'

Total assets

798,953,000

581,147,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

496,951,000

'

'

'

'

'

'

'

'

'

LIABILITIES AND EQUITY (DEFICIT)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts payable

19,400,000

18,735,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued expenses

60,391,000

41,770,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liabilities from inventories not owned

20,738,000

39,029,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable

35,471,000

13,248,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

74,009,000

'

'

'

'

'

'

'

'

'

Liabilities

461,000,000

437,782,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

666,821,000

'

'

'

'

'

'

'

'

'

Commitments and contingencies

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable convertible preferred stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable convertible preferred stock

'

71,246,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

Equity (deficit):

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock

'

'

'

276,000

85,000

701,000

38,000

38,000

315,000

20,000

160,000

3,000

25,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional paid-in capital

310,376,000

74,168,000

73,113,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48,867,000

'

'

'

'

'

'

'

'

'

Accumulated deficit

-722,000

-11,602,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-228,383,000

'

'

'

'

'

'

'

'

'

Total William Lyon Homes stockholders' equity

309,968,000

62,712,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-179,516,000

'

'

'

'

'

'

'

'

'

Noncontrolling interest

27,985,000

9,407,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,646,000

'

'

'

'

'

'

'

'

'

Total equity

337,953,000

72,119,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-169,870,000

'

'

'

'

'

'

'

'

'

Total liabilities and equity

798,953,000

581,147,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

496,951,000

'

'

'

'

'

'

'

'

'

Secured debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

206,000,000

'

'

'

'

Senior Notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$325,000,000

$325,000,000

$325,000,000

'

'

'

'

'

'

'

'

'

'

$66,704,000

$138,912,000

$77,867,000

[1]

Represents the consolidation of a land banking arrangement. Although the Company is not obligated to purchase the lots, based on certain factors, the Company has determined that it is economically compelled to purchase the lots in the land banking arrangement. Amounts are net of deposits.

[2]

Represents the consolidation of a land banking arrangement which does not obligate the Company to purchase the lots, however, based on certain factors, the Company has determined it is economically compelled to purchase the lots in the land banking arrangement, which has been consolidated. Amounts are net of deposits.

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2011

In Thousands, except Share data, unless otherwise specified

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Scenario, Previously Reported [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Preferred stock [Member]

Preferred stock [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Intangibles, accumulated amortization

$6,930

$5,757

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable convertible preferred stock, par value

$0.01

$0.01

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable convertible preferred stock, shares authorized

0

9,696,970

80,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable convertible preferred stock, shares issued

0

9,334,030

77,005,744

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable convertible preferred stock, shares outstanding

0

9,334,030

77,005,744

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, par value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.01

$0.01

'

Preferred stock, shares authorized

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

10,000,000

'

Preferred stock, shares issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

Preferred stock, shares outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

Common stock, par value

'

'

'

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

'

'

$0.01

Common stock, shares authorized

'

'

'

150,000,000

41,212,121

340,000,000

30,000,000

6,060,606

50,000,000

0

14,545,455

120,000,000

0

3,636,364

30,000,000

'

'

3,000

Common stock, shares issued

'

'

'

27,626,840

8,499,558

70,121,378

3,813,884

3,813,884

31,464,548

0

1,941,859

16,020,338

'

'

'

'

'

'

Common stock, shares outstanding

'

'

'

27,626,840

8,499,558

70,121,378

3,813,884

3,813,884

31,464,548

0

1,941,859

16,020,338

0

302,945

2,499,293

'

'

1,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Operations (USD $)	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010
	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
Operating revenue	'	'	'	'	'	'	'	'
Home sales	$141,352	$76,617	$145,977	$338,434	$244,610	$16,687	$207,055	$266,865
Lots, land and other sales	'	9,325	100,125	3,248	104,325	'	'	17,204
Construction services	9,478	7,045	16,473	21,439	23,825	8,883	19,768	10,629
Revenues	150,830	92,987	262,575	363,121	372,760	25,570	226,823	294,698
Operating costs	'	'	'	'	'	'	'	'
Cost of sales - homes	-107,957	-63,012	-122,155	-267,932	-203,203	-14,598	-184,489	-225,751
Cost of sales - lots, land and other	'	-7,783	-92,975	-2,838	-94,786	'	-4,234	-20,426
Impairment loss on real estate assets	'	'	'	'	'	'	-128,314	-111,860
Construction services	-8,135	-6,410	-15,061	-17,472	-21,416	-8,223	-18,164	-7,805
Sales and marketing	-6,679	-4,172	-8,835	-17,482	-13,928	-1,944	-16,848	-19,746
General and administrative	-10,200	-5,440	-13,925	-28,016	-26,095	-3,302	-22,411	-25,129
Amortization of intangible assets	-191	-1,640	-5,034	-1,173	-5,757	'	'	'
Other	-695	-945	-2,402	-1,746	-2,909	-187	-3,983	-2,740
Operating expenses	-133,857	-89,402	-260,387	-336,659	-368,094	-28,254	-378,443	-413,457
Equity in income of unconsolidated joint ventures	'	'	'	'	'	'	3,605	916
Operating (loss) income	16,973	3,585	2,188	26,462	4,666	-2,684	-148,015	-117,843
(Loss) gain on extinguishment of debt	'	'	975	'	-1,392	'	'	5,572
Interest expense, net of amounts capitalized	-51	-2,491	-7,327	-2,602	-9,127	-2,507	-24,529	-23,653
Other income, net	114	95	1,471	257	1,528	230	838	57
Income (loss) before reorganization items	17,036	1,189	-3,668	24,117	-4,325	-4,961	-171,706	-135,867
Reorganization items, net	'	-712	-1,894	-464	-2,525	233,458	-21,182	'
(Loss) income before (provision) benefit from income taxes	17,036	477	-5,562	23,653	-6,850	228,497	-192,888	-135,867
(Provision) benefit from income taxes	-6,356	-11	-11	-6,366	-11	0	-10	412
Net (loss) income	10,680	466	-5,573	17,287	-6,861	228,497	-192,898	-135,455
Less: Net income attributable to noncontrolling interest	-3,118	-1,218	-2,038	-4,879	-1,998	-114	-432	-1,331
Net (loss) income attributable to William Lyon Homes	7,562	-752	-7,611	12,408	-8,859	228,383	-193,330	-136,786
Preferred stock dividends	0	-755	-1,798	-1,528	-2,743	'	'	'
Net (loss) income available to common stockholders	$7,562	($1,507)	($9,409)	$10,880	($11,602)	$228,383	($193,330)	($136,786)
Income (loss) per common share:	'	'	'	'	'	'	'	'
Basic	$0.24	($0.12)	($0.80)	$0.48	'	$228,383	'	'
Diluted	$0.24	($0.12)	($0.80)	$0.46	'	$228,383	'	'
(Loss) income per common share, basic and diluted	'	($0.01)	'	'	($0.11)	$228,383	($193,330)	($136,786)
Weighted average common shares outstanding:	'	'	'	'	'	'	'	'
Basic	30,975,160	12,408,263	11,716,413	22,569,810	103,037,842	1,000	1,000	1,000
Diluted	31,895,814	12,408,263	11,716,413	23,446,954	103,037,842	1,000	1,000	1,000
Weighted average common shares outstanding, basic and diluted	'	'	'	'	103,037,842	1,000	1,000	1,000

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Equity (USD $)

Total

Predecessor [Member]

Predecessor Before Adjustments [Member]

Successor [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Retained Earnings (Accumulated Deficit) [Member]

Retained Earnings (Accumulated Deficit) [Member]

Non-Controlling Interest [Member]

Non-Controlling Interest [Member]

Non-Controlling Interest [Member]

In Thousands, except Share data

USD ($)

USD ($)

USD ($)

Predecessor [Member]

Predecessor Before Adjustments [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor Before Adjustments [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Successor [Member]

Predecessor [Member]

Predecessor Before Adjustments [Member]

Successor [Member]

USD ($)

USD ($)

Scenario, Previously Reported [Member]

USD ($)

USD ($)

USD ($)

Scenario, Previously Reported [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Balance at Dec. 31, 2009

'

$158,199

'

'

'

'

'

'

$48,867

'

'

'

$101,733

'

$7,599

'

'

Balance Shares at Dec. 31, 2009

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

-135,455

'

'

'

'

'

'

'

'

'

'

-136,786

'

1,331

'

'

Cash contributions by members of consolidated entities

'

6,546

'

'

'

'

'

'

'

'

'

'

'

'

6,546

'

'

Cash distributions to members of consolidated entities

'

-3,913

'

'

'

'

'

'

'

'

'

'

'

'

-3,913

'

'

Balance at Dec. 31, 2010

'

25,377

'

'

'

'

'

'

48,867

'

'

'

-35,053

'

11,563

'

'

Balance Shares at Dec. 31, 2010

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

-11,177

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Mar. 31, 2011

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2010

'

25,377

'

'

'

'

'

'

48,867

'

'

'

-35,053

'

11,563

'

'

Balance Shares at Dec. 31, 2010

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

-192,898

'

'

'

'

'

'

'

'

'

'

-193,330

'

432

'

'

Cash contributions by members of consolidated entities

'

6,605

'

'

'

'

'

'

'

'

'

'

'

'

6,605

'

'

Cash distributions to members of consolidated entities

'

-8,954

'

'

'

'

'

'

'

'

'

'

'

'

-8,954

'

'

Balance at Dec. 31, 2011

'

-169,870

'

'

'

'

'

'

'

'

'

'

-228,383

'

9,646

'

'

Balance at Sep. 30, 2011

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

-130,926

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2011

'

-169,870

'

'

'

'

'

'

48,867

'

'

'

-228,383

'

9,646

'

'

Balance Shares at Dec. 31, 2011

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

228,497

'

'

'

'

'

'

'

'

'

'

-7,201

'

114

'

'

Cash contributions by members of consolidated entities

'

1,825

'

'

'

'

'

'

'

'

'

'

'

'

1,825

'

'

Cash distributions to members of consolidated entities

'

-1,897

'

'

'

'

'

'

'

'

'

'

'

'

-1,897

'

'

Issuance of common stock

'

'

44,115

'

'

924

'

'

'

43,191

'

'

'

'

'

'

'

Issuance of common stock Shares

'

'

'

'

'

92,368

'

'

'

'

'

'

'

'

'

'

'

Cancellation of predecessor common stock

'

'

'

'

-1

'

'

'

'

'

'

'

'

'

'

'

'

Plan of reorganization and fresh start valuation adjustments

'

185,129

'

'

'

'

'

'

'

'

'

'

186,717

'

-1,588

'

'

Elimination of predecessor accumulated deficit

'

'

'

'

'

'

'

'

-48,867

'

'

'

48,867

'

'

'

'

Balance at Feb. 24, 2012

'

-177,029

8,100

52,215

'

'

'

'

48,867

'

'

'

-235,584

'

9,688

8,100

'

Balance Shares at Feb. 24, 2012

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

'

'

-4,982

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Mar. 31, 2012

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Feb. 24, 2012

'

'

'

52,215

'

'

'

'

'

'

'

'

'

'

'

8,100

'

Net (loss) income

'

'

'

-5,573

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock dividends

'

'

'

-1,798

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2012

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Feb. 24, 2012

'

'

'

52,215

'

'

924

'

'

'

43,191

'

'

'

'

8,100

8,100

Balance Shares at Feb. 24, 2012

'

'

'

'

'

'

92,368

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

'

'

-6,861

'

'

'

'

'

'

'

'

'

-8,859

'

'

1,998

Cash contributions by members of consolidated entities

'

'

'

15,313

'

'

'

'

'

'

'

'

'

'

'

'

15,313

Cash distributions to members of consolidated entities

'

'

'

-16,004

'

'

'

'

'

'

'

'

'

'

'

'

-16,004

Issuance of common stock

'

'

'

26,500

'

'

252

'

'

'

26,248

'

'

'

'

'

'

Issuance of common stock Shares

'

'

'

'

'

'

25,239

'

'

'

'

'

'

'

'

'

'

Issuance of restricted stock

'

'

'

'

'

'

25

'

'

'

-25

'

'

'

'

'

'

Issuance of restricted stock Shares

'

'

'

'

'

'

2,499

'

'

'

'

'

'

'

'

'

'

Stock based compensation

'

'

'

3,699

'

'

'

'

'

'

3,699

'

'

'

'

'

'

Preferred stock dividends

'

'

'

-2,743

'

'

'

'

'

'

'

'

'

-2,743

'

'

'

Balance at Dec. 31, 2012

'

'

'

72,119

'

'

146

1,201

'

'

74,168

73,113

'

-11,602

'

'

9,407

Balance Shares at Dec. 31, 2012

'

'

'

'

'

'

14,558

120,106

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2012

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

'

'

-1,288

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2012

'

'

'

72,119

'

'

146

1,201

'

'

74,168

73,113

'

-11,602

'

'

9,407

Balance Shares at Dec. 31, 2012

'

'

'

'

'

'

14,558

120,106

'

'

'

'

'

'

'

'

'

Net (loss) income

'

'

'

17,287

'

'

'

'

'

'

'

'

'

12,408

'

'

4,879

Cash contributions by members of consolidated entities

'

'

'

35,399

'

'

'

'

'

'

'

'

'

'

'

'

35,399

Cash distributions to members of consolidated entities

'

'

'

-21,700

'

'

'

'

'

'

'

'

'

'

'

'

-21,700

Conversion of redeemable convertible preferred stock to Class A common stock

'

'

'

70,386

'

'

93

'

'

'

70,293

'

'

'

'

'

'

Conversion of redeemable convertible preferred stock to Class A common stock, shares

'

'

'

'

'

'

9,334

'

'

'

'

'

'

'

'

'

'

Issuance of common stock, net of offering costs

'

'

'

163,783

'

'

72

'

'

'

163,711

'

'

'

'

'

'

Issuance of common stock, net of offering costs, Shares

'

'

'

'

'

'

7,178

'

'

'

'

'

'

'

'

'

'

Issuance of restricted stock

'

'

'

'

'

'

3

'

'

'

-3

'

'

'

'

'

'

Issuance of restricted stock Shares

80,284

'

'

'

'

'

371

'

'

'

'

'

'

'

'

'

'

Stock based compensation

'

'

'

2,207

'

'

'

'

'

'

2,207

'

'

'

'

'

'

Preferred stock dividends

'

'

'

-1,528

'

'

'

'

'

'

'

'

'

-1,528

'

'

'

Balance at Sep. 30, 2013

'

'

'

337,953

'

'

314

'

'

'

310,376

'

'

-722

'

'

27,985

Balance Shares at Sep. 30, 2013

'

'

'

'

'

'

31,441

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2013

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income

'

'

'

10,680

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of restricted stock Shares

3,996

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock dividends

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2013

'

'

'

$337,953

'

'

'

'

'

'

'

'

'

'

'

'

'

Condense_Consolidated_Statemen

Condense Consolidated Statements Of Cash Flows (USD $)	7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
							Real estate inventories - Owned	Real estate inventories - Owned
Operating activities	'	'	'	'	'	'	'	'
Net (loss) income	($5,573)	$17,287	($6,861)	$228,497	($192,898)	($135,455)	'	'
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:	'	'	'	'	'	'	'	'
Depreciation and amortization	5,640	2,184	6,631	586	3,875	3,718	'	'
Impairment loss on real estate assets	'	'	'	'	128,314	111,860	'	'
Stock based compensation expense	'	2,207	3,699	'	'	'	'	'
Equity in income of unconsolidated joint ventures	'	'	'	'	-3,605	-916	'	'
Loss on sale of property and equipment	'	4	'	'	'	'	'	'
Loss on sale of fixed asset	'	'	'	'	83	122	'	'
Reorganization items:	'	'	'	'	'	'	'	'
Cancellation of debt	'	'	'	-298,831	'	'	'	'
Plan implementation and fresh start adjustments	'	'	'	49,302	'	'	'	'
Write off of deferred loan costs	'	'	'	8,258	'	'	'	'
Accrued professional fees	'	'	'	'	1,000	'	'	'
Loss (gain) on extinguishment of debt	'	'	1,104	'	'	-5,572	'	'
Loss (gain) on extinguishment of debt	-975	'	1,392	'	'	-5,572	'	'
Net changes in operating assets and liabilities:	'	'	'	'	'	'	'	'
Restricted cash	-35	'	-1	'	-211	3,711	'	'
Receivables	-1,514	-6,866	-2,924	941	4,767	-2,205	'	'
Income tax refunds receivable	'	'	'	'	'	107,401	'	'
Real estate inventories	'	'	'	'	'	'	18,151	-66,317
Other assets	616	3,110	605	206	-4,422	15,898	'	'
Accounts payable	1,487	665	7,706	4,618	-1,522	-4,142	'	'
Accrued expenses	6,526	18,784	9,778	-3,851	7,817	-3,984	'	'
Liabilities from real estate inventories not owned	-1,250	-18,291	-7,129	-1,250	'	'	'	'
Net cash (used in) provided by operating activities	55,989	-164,919	49,993	-17,321	-38,651	24,119	'	'
Investing activities	'	'	'	'	'	'	'	'
Investment in and advances to unconsolidated joint ventures	'	'	'	'	'	-194	'	'
Distributions from unconsolidated joint ventures	'	'	'	'	1,435	4,183	'	'
Cash paid for acquisitions, net	'	'	-33,201	'	'	'	'	'
Purchases of property and equipment	-53	-3,359	-312	0	-128	-64	'	'
Net cash (used in) provided by investing activities	-53	-3,359	-33,513	0	1,307	3,925	'	'
Financing activities	'	'	'	'	'	'	'	'
Proceeds from borrowings on notes payable	'	51,444	13,248	'	'	7,087	'	'
Proceeds from issuance of 8 1/2% Senior Notes	'	'	325,000	'	'	'	'	'
Principal payments on notes payable	-62,557	-45,459	-73,676	-616	-11,532	-52,797	'	'
Principal payments on Senior Secured Term Loan	'	'	-235,000	'	'	'	'	'
Principal payments on Senior Subordinated Secured Notes	'	'	-75,916	'	'	'	'	'
Proceeds from reorganization	'	'	'	30,971	'	'	'	'
Proceeds from issuance of convertible preferred stock	'	'	14,000	50,000	'	'	'	'
Proceeds from issuance of common stock	'	179,438	16,000	'	'	'	'	'
Proceeds from debtor in possession financing	'	'	'	5,000	'	'	'	'
Principal payment of debtor in possession financing	'	'	'	-5,000	'	'	'	'
Payment of deferred loan costs	'	-1,792	-7,181	-2,491	'	'	'	'
Net cash paid for repurchase of Senior Notes	'	'	'	'	'	-31,268	'	'
Offering costs related to issuance of common stock	'	-15,655	'	'	'	'	'	'
Payment of preferred stock dividends	-1,114	-2,550	-1,721	'	'	'	'	'
Noncontrolling interest contributions	17,021	35,399	15,313	1,825	6,605	6,546	'	'
Noncontrolling interest distributions	-15,373	-21,700	-16,004	-1,897	-8,954	-3,913	'	'
Net cash (used in) provided by financing activities	-62,023	179,125	-25,937	77,792	-13,881	-74,345	'	'
Net (decrease) increase in cash and cash equivalents	-6,087	10,847	-9,457	60,471	-51,225	-46,301	'	'
Cash and cash equivalents - beginning of period	80,532	71,075	80,532	20,061	71,286	117,587	'	'
Cash and cash equivalents - end of period	74,445	81,922	71,075	80,532	20,061	71,286	'	'
Supplemental disclosures:	'	'	'	'	'	'	'	'
Cash paid for professional fees relating to the reorganization	'	'	3,228	7,813	20,182	'	'	'
Supplemental disclosures of non-cash investing and financing activities:	'	'	'	'	'	'	'	'
Conversion of convertible preferred stock to common stock	'	70,386	'	'	'	'	'	'
Issuance of common stock related to land acquisition	10,500	'	10,500	'	'	'	'	'
Land contributed in lieu of cash for common stock	'	'	'	4,029	'	'	'	'
Distributions of real estate from unconsolidated joint ventures	'	'	'	'	800	'	'	'
Accretion of payable in kind dividends on convertible preferred stock	'	'	860	'	'	'	'	'
Preferred stock dividends, accrued	684	'	162	'	'	'	'	'
Net change in real estate inventories-not owned and liabilities from inventories not owned	'	'	'	'	7,862	10,652	'	'
Issuance of note payable related to land acquisition	'	16,238	'	'	55,000	'	'	'
Accrued purchases of property, plant and equipment	'	142	'	'	'	'	'	'
Accretion of Senior Subordinated Secured Notes for payable in kind interest	$916	'	'	'	'	'	'	'

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2012
Basis of Presentation and Significant Accounting Policies	'
	Note 1—Basis of Presentation and Significant Accounting Policies
	Operations
	William Lyon Homes, a Delaware corporation (“Parent” and together with its subsidiaries, the “Company”), are primarily engaged in designing, constructing and selling single family detached and attached homes in California, Arizona, Nevada and Colorado (under the Village Homes brand).
	Basis of Presentation
	We applied the accounting under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 852 (“ASC 852”), “Reorganizations,” as of February 24, 2012 (see Note 3). Therefore, our consolidated balance sheet as of December 31, 2012, which is referred to as that of the “Successor”, includes adjustments resulting from the reorganization and application of ASC 852 and is not comparable to our balance sheet as of December 31, 2011, which is referred to as that of the “Predecessor”. References to the “Successor” in the consolidated financial statements and the notes thereto refer to the Company after giving effect to the reorganization and application of ASC 852. References to the “Predecessor” refer to the Company prior to the reorganization and application of ASC 852.
	The preparation of the Company’s financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of the assets and liabilities as of December 31, 2012 and 2011 and revenues and expenses for the period from January 1, 2012 through February 24, 2012, period from February 25, 2012 through December 31, 2012, and years ended December 31, 2011 and 2010. Accordingly, actual results could differ from those estimates. The significant accounting policies using estimates include real estate inventories and cost of sales, impairment of real estate inventories, warranty reserves, loss contingencies, sales and profit recognition, accounting for variable interest entities, and fresh start accounting. The current economic environment increases the uncertainty inherent in these estimates and assumptions.
	The consolidated financial statements include the accounts of the Company and all majority-owned and controlled subsidiaries and joint ventures, and certain joint ventures and other entities which have been determined to be variable interest entities in which the Company is considered the primary beneficiary (see Note 5). The accounting policies of the joint ventures are substantially the same as those of the Company. All significant intercompany accounts and transactions have been eliminated in consolidation.
	Real Estate Inventories
	Real estate inventories are carried at cost net of impairment losses, if any. Real estate inventories consist primarily of land deposits, land and land under development, homes completed and under construction, and model homes. All direct and indirect land costs, offsite and onsite improvements and applicable interest and other carrying charges are capitalized to real estate projects during periods when the project is under development. Land, offsite costs and all other common costs are allocated to land parcels benefited based upon relative fair values before construction. Onsite construction costs and related carrying charges (principally interest and property taxes) are allocated to the individual homes within a phase based upon the relative sales value of the homes. The Company relieves its accumulated real estate inventories through cost of sales for the estimated cost of homes sold. Selling expenses and other marketing costs are expensed in the period incurred. A provision for warranty costs relating to the Company’s limited warranty plans is included in cost of sales and accrued expenses at the time the sale of a home is recorded. The Company generally reserves approximately one to one and one quarter percent of the sales price of its homes against the possibility of future charges relating to its one-year limited warranty and similar potential claims. Factors that affect the Company’s warranty liability include the number of homes under warranty, historical and anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the amounts as necessary. Changes in the Company’s warranty liability for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011and 2010 are as follows (in thousands):
		Successor			Predecessor
		Period from			Period from			Year Ended
		February 25			January 1			December  31,
		through			through
		December 31,			February 24,
		2012			2012			2011			2010
	Warranty liability, beginning of period	$	14,000		$	14,314		$	16,341		$	21,365
	Warranty provision during period		2,731			187			2,380			2,574
	Warranty payments during period		(3,216	)		(845	)		(4,699	)		(8,277	)
	Warranty charges related to pre-existing warranties during period		802			199			292			679
	Fresh start adjustment		—			145			—			—
	Warranty liability, end of period	$	14,317		$	14,000		$	14,314		$	16,341
	Interest incurred under the Company’s debt obligations, as more fully discussed in Note 10, is capitalized to qualifying real estate projects under development. Any additional interest charges related to real estate projects not under development are expensed in the period incurred. Interest activity for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011and 2010 are as follows (in thousands):
		Successor			Predecessor
		Period from			Period from			Year Ended
		February 25			January 1			December 31,
		through			through
		December 31,			February 24,
		2012			2012			2011			2010
	Interest incurred	$	30,526		$	7,145		$	61,464		$	62,791
	Less: Interest capitalized		(21,399	)		(4,638	)		(36,935	)		(39,138	)
	Interest expense, net of amounts capitalized	$	9,127		$	2,507		$	24,529		$	23,653
	Cash paid for interest	$	26,560		$	8,924		$	48,018		$	59,748
	Construction Services
	The Company accounts for construction management agreements using the Percentage of Completion Method in accordance with FASB ASC Topic 605 Revenue Recognition (“ASC 605”). Under ASC 605, the Company records revenues and expenses as a contracted project progresses, and based on the percentage of costs incurred to date compared to the total estimated costs of the contract.
	The Company entered into construction management agreements to build, sell and market homes in certain communities. For such services, the Company will receive fees (generally 3 to 5 percent of the sales price, as defined) and may, under certain circumstances, receive additional compensation if certain financial thresholds are achieved.
	Financial Instruments
	Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash investments, receivables, and deposits. The Company typically places its cash investments in investment grade short-term instruments. Deposits, included in other assets, are due from municipalities or utility companies and are generally collected from such entities through fees assessed to other developers. The Company is an issuer of, or subject to, financial instruments with off-balance sheet risk in the normal course of business which exposes it to credit risks. These financial instruments include letters of credit and obligations in connection with assessment district bonds. These off-balance sheet financial instruments are described in more detail in Note 19.
	Cash and Cash Equivalents
	Short-term investments with a maturity of three months or less when purchased are considered cash equivalents. The Company’s cash and cash equivalents balance exceeds federally insurable limits as of December 31, 2012 and 2011. The Company monitors the cash balances in its operating accounts and adjusts the cash balances as appropriate; however, these cash balances could be negatively impacted if the underlying financial institutions fail or are subject to other adverse conditions in the financial markets. To date, the Company has experienced no loss or lack of access to cash in its operating accounts.
	Restricted Cash
	Restricted cash consists of deposits made by the Company to a bank account as collateral for the use of letters of credit to guarantee the Company’s financial obligations under certain other contractual arrangements in the normal course of business.
	Deferred Loan Costs
	Deferred loan costs represent debt issuance cost and are primarily amortized to interest expense using the straight line method which approximates the effective interest method.
	Goodwill
	In accordance with the provisions of ASC 350, Intangibles, Goodwill and Other, goodwill amounts are not amortized, but rather are analyzed for impairment at the reporting segment level. Goodwill is analyzed on an annual basis, or when indicators of impairment exist. We have determined that we have five reporting segments, as discussed in Note 6, and we will perform an annual goodwill impairment analysis during the fourth quarter of each fiscal year, with the first annual testing carried out in the fourth quarter of fiscal year 2012.
	Intangible Assets
	Recorded intangible assets primarily relate to construction management contracts, homes in backlog, and joint venture management fee contracts recorded in conjunction with ASC 852. Such assets were valued based on expected cash flows related to home closings, and the asset is amortized on a per unit basis, as homes under the contracts close.
	Income (loss) per common share
	The Company computes income (loss) per common share in accordance with FASB ASC Topic 260, Earnings per Share, which requires income (loss) per common share for each class of stock to be calculated using the two-class method. The two-class method is an allocation of income (loss) between the holders of common stock and a company’s participating security holders.
	Basic income (loss) per common share is computed by dividing income or loss available to common stockholders by the weighted average number of shares of common stock outstanding. For purposes of determining diluted income (loss) per common share, basic income (loss) per common share is further adjusted to include the effect of potential dilutive common shares outstanding.
	Income Taxes
	Income taxes are accounted for under the provisions of Financial Accounting Standards Board ASC 740, Income Taxes, using an asset and liability approach. Deferred income taxes reflect the net effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, and operating loss and tax credit carryforwards measured by applying currently enacted tax laws. A valuation allowance is provided to reduce net deferred tax assets to an amount that is more likely than not to be realized. ASC 740 prescribes a recognition threshold and a measurement criteria for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be considered “more-likely-than-not” to be sustained upon examination by taxing authorities. The Company has taken positions in certain taxing jurisdictions for which it is more likely than not that previously unrecognized tax benefits will be recognized. In addition, the Company has elected to recognize interest and penalties related to uncertain tax positions in the income tax provision.
	Impact of Recent Accounting Pronouncements
	In 2011, the FASB issued ASU 2011-04, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs. This ASU represents the converged guidance of the FASB and the IASB (the Boards) on fair value measurement and results in common requirements for measuring fair value and for disclosing information about fair value measurements, including a consistent meaning of the term “fair value.” Our adoption of these new provisions of ASU 2011-04 on January 1, 2012 did not have an impact on our consolidated financial statements.
	In 2012, the FASB issued ASU 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment. The amendments permit an entity first to assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with Subtopic 350-30. Previous guidance required an entity to test indefinite-lived intangible assets for impairment, on at least an annual basis, by comparing the fair value of the asset with its carrying amount. If the carrying amount of the intangible asset exceeds its fair value, an entity should recognize an impairment loss in the amount of that excess. An entity has the option not to calculate annually the fair value of an indefinite-lived intangible asset if the entity determines that it is not more likely than not that the asset is impaired. For the year ended December 31, 2012, the Company did not elect to use qualitative assessment option permitted by this amendment; however, the Company anticipates using the qualitative assessment option in future periods.
	Reclassifications
	Certain balances on the financial statements and certain amounts presented in the notes have been reclassified in order to conform to current year presentation.

Emergence_From_Chapter_11

Emergence From Chapter 11	12 Months Ended
	Dec. 31, 2012
Emergence From Chapter 11	'
	Note 2—Emergence from Chapter 11
	On December 19, 2011, William Lyon Homes (the “Company”) and certain of its direct and indirect wholly-owned subsidiaries filed voluntary petitions, under chapter 11 of Title 11 of the United States Code, as amended (the “Chapter 11 Petitions”), in the United States Bankruptcy Court for the District of Delaware (the “Bankruptcy Court”) to seek approval of the Prepackaged Joint Plan of Reorganization (the “Plan”) of the Company and certain of its subsidiaries. The Chapter 11 Petitions were jointly administered under the caption In re William Lyon Homes, et al., Case No. 11-14019 (the “Chapter 11 Cases”). The sole purpose of the Chapter 11 Cases was to restructure the Company’s debt obligations and strengthen its balance sheet.
	On February 10, 2012, the Bankruptcy Court confirmed the Plan. On February 24, 2012, the Company and its subsidiaries consummated the principal transactions contemplated by the Plan, including:
		•	the issuance of 44,793,255 shares of the Company’s new Class A Common Stock, $0.01 par value per share (“Class A Common Stock”) and $75 million aggregate principal amount of 12% Senior Subordinated Secured Notes due 2017 (“Second Lien Notes”) issued by the Company’s wholly-owned subsidiary, William Lyon Homes, Inc. (“Borrower”) in exchange for the claims held by the holders of the formerly outstanding notes of Borrower;
		•	the amendment of the Borrower’s loan agreement with ColFin WLH Funding, LLC and certain other lenders which resulted, among other things, in the increase in the principal amount outstanding under the loan agreement, the reduction in the interest rate payable under the loan agreement, and the elimination of any prepayment penalty under the loan agreement;
		•	the issuance, in exchange for cash and land deposits of $25 million, of 31,464,548 shares of the Company’s new Class B Common Stock, $0.01 par value per share (“Class B Common Stock”) and warrants to purchase 15,737,294 shares of Class B Common Stock;
		•	the issuance of 64,831,831 shares of Parent’s new Convertible Preferred Stock, $0.01 par value per share, or Convertible Preferred Stock, for $50.0 million in cash, and 12,966,366 shares of Parent’s new Class C Common Stock, $0.01 par value per share or Class C Common Stock, for $10.0 million in cash. The aggregate cash consideration of $60 million was apportioned between Common and Preferred in accordance with the Plan; and
		•	the issuance of an additional 3,144,000 shares of Class C Common Stock to Luxor Capital Group LP as a transaction fee in consideration for providing the backstop commitment of the offering of shares of Class C Common Stock and Convertible Preferred Stock in connection with the Plan.

Fresh_Start_Accounting_and_Eff

Fresh Start Accounting and Effects of the Plan	12 Months Ended
	Dec. 31, 2012
Fresh Start Accounting and Effects of the Plan	'
	Note 3—Fresh Start Accounting and Effects of the Plan
	As required by U.S. GAAP, effective as of February 24, 2012, we adopted fresh start accounting following the guidance of ASC 852. Fresh start accounting results in the Company becoming a new entity for financial reporting purposes. Accordingly, our consolidated financial statements for periods prior to February 25, 2012 are not comparable to consolidated financial statements presented on or after February 25, 2012. Fresh start accounting was required upon emergence from Chapter 11 because holders of voting shares immediately before confirmation of the Plan received less than 50% of the emerging entity and the reorganization value of our assets immediately before confirmation of our Plan was less than our post-petition liabilities and allowed claims. Fresh start accounting results in a new basis of accounting and reflects the allocation of our estimated fair value to underlying assets and liabilities. Our estimates of fair value are inherently subject to significant uncertainties and contingencies beyond our reasonable control. Accordingly, there can be no assurance that the estimates, assumptions, valuations, appraisals and financial projections will be realized, and actual results could vary materially. Moreover, the market value of our common stock may differ materially from the equity valuation for accounting purposes under ASC 852. In addition, the cancellation of debt income and the allocation of the attribute reduction for tax purposes is an estimate and will not be finalized until the 2012 tax return is filed. Any change resulting from this estimate could impact deferred taxes.
	Under ASC 852, the Successor Company must determine a value to be assigned to the equity of the emerging company as of the date of adoption of fresh-start accounting, which was February 24, 2012 for the Company, the date the Debtors emerged from Chapter 11. To facilitate the adoption of fresh start accounting, the Company engaged a third-party valuation firm to assist with assessing enterprise value, and the allocation of value to the assets and liabilities of the Company. To calculate enterprise value, the Company used a discounted cash flow analysis, considering a weighted average cost of capital of 16.5%, and utilized a Gordon Growth model with a 3.0% growth rate to calculate terminal value. The analysis resulted in an enterprise value of $485.0 million, which was used as the enterprise value for fresh start accounting. The Company’s total debt was valued at $384.5 million, which consists of the following:
		•		$6.3 million related to a construction note payable with an outstanding principal amount of $6.5 million, which reflects an adjustment of $(0.2) million. The Company discounted the contractual interest and principal payments using a risk adjusted rate of 12.5%.
		•		$56.3 million related to a construction note payable with an outstanding principal amount of $55.0 million, which reflects an adjustment of $1.3 million. The Company discounted the contractual interest and principal payments using a risk adjusted rate of 12.5%.
		•		$2.9 million related to a seller note arrangement that matured on March 1, 2012, 6 days after the plan of reorganization was approved. The payment was made in full, therefore the value of the note was the amount paid.
		•		The remaining debt that was renegotiated as part of the Company’s plan of reorganization, consists of a construction note payable of $9.0 million, the $235.0 million Senior Secured Term Loan and the $75.0 million Senior Subordinated Secured Notes due 2017. In accordance with ASC 820, Fair Value Measurements and Disclosures, fair value is defined as, “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date”. As these debt amounts were negotiated as part of the reorganization by market participants, their carrying value at that date is representative of fair value.
	The enterprise value of the Company was $485.0 million, which includes $384.5 million fair value of debt, as detailed above, and $100.5 million of equity value. The value of each type of equity security was determined using an option pricing model used in accordance with ASC 718, Valuation of Stock Compensation, and treated the redeemable convertible preferred stock, the common stock and the common stock warrants as separate securities. Based on the rights and preferences of each security, the Company valued each security based on a series of five events:
		(i)	liquidation preference of the redeemable convertible preferred stock,
		(ii)	timing of participation of Class A and B shares of common stock,
		(iii)	timing of participation of Class C shares of common stock,
		(iv)	conversion of preferred shares into common shares, and
		(v)	exercise of warrants
	The Company used an option pricing model and the relative rights of the securities to allocate the $100.5 million among the redeemable convertible preferred stock, the common stock and the warrants. Each security was valued based on the relative rights and preferences and a three year term to liquidity event, volatility of 59% based on public company comparables, a risk free rate of .43% based on a three year treasury rate. In addition, the redeemable convertible preferred stock has a dividend yield of 6% and the common stock and warrants have a discount for lack of marketability of 38%. Based on these inputs and the assumptions, the redeemable convertible preferred stock was valued at $56.4 million, the common stock was valued at $43.1 million and the warrants were valued at $1.0 million.
	The estimated enterprise value and the equity value are highly dependent on the achievement of the future financial results contemplated in the projections that were set forth in the disclosure statement to the Plan. The estimates and assumptions made in the valuation are inherently subject to significant uncertainties. The primary assumptions for which there is a reasonable possibility of the occurrence of a variation that would have significantly affected the reorganization value include the assumptions regarding the number of homes sold and homes closed, average sales prices, operating expenses, the amount and timing of construction costs and the discount rate utilized.
	Fresh-start accounting reflects the value of the Successor as determined in the confirmed Plan. Under fresh-start accounting, asset values are remeasured and allocated based on their respective fair values in conformity with the purchase method of accounting for business combinations in FASB ASC Topic 805, “Business Combinations” (“FASB ASC 805”). Liabilities existing as of February 24, 2012, the Effective Date, other than deferred taxes, were recorded at the present value of amounts expected to be paid using appropriate risk adjusted interest rates. Deferred taxes were determined in conformity with applicable accounting standards. Predecessor accumulated depreciation, accumulated amortization and retained deficit were eliminated.
	In conjunction with the adoption of fresh start accounting, certain intangible assets including, the value of the Company’s homes in backlog, construction management contracts and joint venture management fee contracts were recorded at their estimated fair values as of February 24, 2012 in the amount of $9.5 million. The Company’s backlog was valued using the With/Without Method of the Income Approach to estimate the fair value of the backlog. This asset is amortized on a straight line basis, as homes that were in backlog as of February 24, 2012, are closed or the contract is cancelled.
	The construction management contracts and joint venture management fee contracts were valued using the Multi-period Excess Earnings method of the Income Approach to estimate the fair value. Since these assets are valued based on expected cash flows related to home closings, the asset is amortized on a straight line basis, as homes under the contracts close.
	The following fresh start consolidated balance sheet presents the implementation of the Plan and the adoption of fresh start accounting as of the Effective Date. Reorganization adjustments have been recorded within the consolidated balance sheet to reflect the effects of the Plan, including discharge of liabilities subject to compromise and the adoption of fresh start accounting in accordance with ASC 852.
	CONSOLIDATED BALANCE SHEETS
	(in thousands except number of shares and par value per share)
			February 24, 2012
			Predecessor			Plan of			Fresh Start			Successor
						Reorganization			Accounting
						Adjustments			Adjustments
	ASSETS
	Cash and cash equivalents		$	12,787		$	67,746	(a)	$	—		$	80,533
	Restricted cash			852			—			—			852
	Receivables			12,790			—			(996	)(m)		11,794
	Real estate inventories
	Owned			405,632			4,029	(b)		(1,198	)(n)		408,463
	Not owned			46,158			—			—			46,158
	Property & equipment, net			962			—			(421	)(o)		541
	Deferred loan costs			8,258			(5,767	)(c)		—			2,491
	Goodwill			—			—			14,209	(p)		14,209
	Intangibles			—			—			9,470	(q)		9,470
	Other assets			6,307			47	(d)		—			6,354
	Total assets		$	493,746		$	66,055		$	21,064		$	580,865
	LIABILITIES AND EQUITY (DEFICIT)
	Liabilities not subject to compromise
	Accounts payable		$	10,000		$	—		$	—		$	10,000
	Accrued expenses			31,391			—			221	(r)		31,612
	Liabilities from inventories not owned			46,158			—			—			46,158
	Notes payable			78,394			(5,000	)(f)		1,100	(s)		74,494
	Senior Secured Term Loan due January 31, 2015			206,000			29,000	(g)		—			235,000
	Senior Subordinated Secured Notes due February 25, 2017			—			75,000	(h)		—			75,000
				371,943			99,000			1,321			472,264
	Liabilities subject to compromise
	Accrued expenses			15,297			(15,297	)(e)		—			—
	75/8% Senior Notes due December 15, 2012			66,704			(66,704	)(e)		—			—
	103/4% Senior Notes due April 1, 2013			138,964			(138,964	)(e)		—			—
	71/2% Senior Notes due February 15, 2014			77,867			(77,867	)(e)		—			—
				298,832			(298,832	)		—			—
	Redeemable convertible preferred stock			—			56,386	(i)		—			56,386
	Equity (deficit):
	William Lyon Homes stockholders’ equity (deficit)
	Common stock, Class A			—			448	(j)		—			448
	Common stock, Class B			—			315	(j)		—			315
	Common stock, Class C			—			161	(j)		—			161
	Additional paid-in capital			48,867			(21,177	)(k)		15,501	(t)		43,191
	Accumulated deficit			(235,584	)		229,754	(l)		5,830	(u)		—
	Total William Lyon Homes stockholder’s equity (deficit)			(186,717	)		209,501			21,331			44,115
	Noncontrolling interest			9,688			—			(1,588	)(v)		8,100
Total equity (deficit)			(177,029	)		209,501			19,743			52,215
Total liabilities and equity (deficit)		$	493,746		$	66,055		$	21,064		$	580,865
Notes to Plan of Reorganization and Fresh Start Accounting Adjustments:
a	Reflects net cash received of $81.0 million from the issuance of new equity, reduced by the repayment of DIP financing of $5.2 million, payment of financing fees of $2.6 million and other reorganization related costs of $5.4 million.
b	Reflects contribution of land option deposit in lieu of cash for Class B Common Stock.
c	Reflects the write-off of the remaining deferred loan costs of the Old Notes net of capitalization of deferred loan costs related to the Amended Term Loan.
d	Reflects prepaid property taxes to obtain title insurance for the second lien notes. Deferred tax assets are not reflected on the balance sheet as they have been fully reserved.
e	Reflects the extinguishment of liabilities subject to compromise (“LSTC”) at emergence. LSTC was comprised of $283.5 million of Old Notes and $15.3 million of related accrued interest. The holders of the Old Notes received Class A common stock of the Successor entity.
f	Reflects repayment of amounts outstanding under the DIP Credit Agreement pursuant to the Plan.
g	Reflects the additional principal added to the Amended Term Loan, in accordance with the Plan.
h	Reflects the issuance of Senior Subordinated Secured Notes of $75.0 million, in accordance with the Plan.
i	Reflects the fair value of the Convertible Preferred Stock issued pursuant to the Plan. The fair value of the total residual equity interest of $100.5 million was determined based on the enterprise value of $485.0 million determined as of the date of the plan, less the $384.5 million fair value of Long-Term debt. Cash received for the convertible preferred was $50.0 million, however as discussed previously, the Company valued the redeemable convertible preferred stock at $56.4 million.
j	Reflects the issuance of 92.4 million total shares in new common stock at $0.01 par value and the extinguishment of 1,000 shares ($0.01 par) of Old Common Stock, in accordance with the plan (see Note 2 for allocation of shares).
k	Reflects the elimination of $48.9 million of additional paid-in capital (“APIC”) relating to Old Common Stock, offset by $27.7 million of net cash received from the issuance of the Class B and Class C shares of common stock.
l	Reflects the elimination of $235.6 million of accumulated deficit of the Predecessor company in addition to the net impact of Plan adjustments to assets, liabilities and stockholder’s equity.
m	Reflects adjustment of $1.0 million to notes receivable with a book value of $6.2 million to fair value of $5.2 million using the discounted cash flow approach. The Company discounted the future interest to be received at a discount rate of 10%, which is above the stated rate of the note.
n	Reflects adjustment of $1.2 million to real estate inventory using the discounted cash flow approach. The Company used project forecasts and an unlevered discount rate of 20% to arrive at fair value. Certain projects that are held for future development were valued on an “As-Is” Basis using market comparables.
o	Reflects adjustment of $0.4 million to property and equipment with a book value of $1.0 million to fair value of $ $0.6 million, based on the estimated sales value of the assets determined on an “As Is” Basis using market comparables.
p	Goodwill represents the excess of enterprise value upon emergence over fair value of net tangible and identifiable intangible assets acquired.
q	Reflects identifiable intangible assets comprised of $4.6 million relating to construction management contracts, $4.0 million relating to homes in backlog, and $0.8 million relating to joint venture management fees. The value of the construction management contracts and the joint venture management fees was estimated using the discounted cash flows of each related project at a discount rate ranging from 17% to 19%. The value of the backlog contracts was determined using the With/Without method of the income approach and the expected closing date of the home in backlog and the contracted sales price of the home.
r	Reflects adjustments to warranty and construction defect litigation liabilities which were valued based on the estimated costs of warranty spending on homes previously closed plus an estimated margin of 9.4%, plus a reasonable margin required to transfer the liability or to fulfill the obligation.
s	Reflects adjustment of one note payable of $(0.2) million, with a book value of $6.5 million to a fair value of $6.3 million. The Company used a discounted cash flow on contracted interest and principal to be received and a risk adjusted discount rate of 12.5%. Also reflects adjustment of one note payable of $1.3 million, with a book value of $55.0 million to a fair value of $56.3 million. The Company used a discounted cash flow on contracted interest and principal to be received and a risk adjusted discount rate of 12.5%.
t	Reflects the adjustment to a combined common stock and warrants value of $44.1 million for the calculation of fair value under the provisions of fresh start accounting, based on the remaining residual equity interest of $100.5 million, as discussed in note (i) above, less the allocation to convertible preferred of $56.4 million, as also discussed in note (i).
u	Reflects the elimination of a balance in accumulated deficit of $5.8 million to reduce any accumulated deficit or retained earnings in conjunction with fresh start accounting, which requires the successor entity to begin with a zero balance in retained earnings.
v	Reflects adjustment of $1.6 million to minority interest in a consolidated entity with a book value of $9.7 million to fair value of $8.1 million. The Company used a discounted cash flow approach to the project and the estimated cash to be distributed to the minority member of the entity, using a discount rate of 17.8%.
Reconciliation of enterprise value to the reorganized value of the Company’s assets and determination of goodwill (in thousands):
Total enterprise value		$	485,000
Add: liabilities (excluding debt and equity)			87,765
Add: noncontrolling interest			8,100
Reorganization value of assets			580,865
Fair value of assets (excluding goodwill)			566,656
Reorganization value in excess of fair value (goodwill)		$	14,209

Reorganization_Items

Reorganization Items	12 Months Ended
	Dec. 31, 2012
Reorganization Items	'
	Note 4—Reorganization Items
	In accordance with authoritative accounting guidance issued by the FASB, separate disclosure is required for reorganization items, such as certain expenses, provisions for losses and other charges directly associated with or resulting from the reorganization and restructuring of the business, which have been realized or incurred during the Chapter 11 Cases. Reorganization items were comprised of the following (in thousands):
		Successor			Predecessor
		Period from			Period from
		February 25			January 1
		through			through
		December 31,			February 24,			Year Ended
		2012			2012			December 31,
								2011			2010
	Cancellation of debt	$	—		$	298,831		$	—		$	—
	Plan implementation and fresh start valuation adjustments		—			(49,302	)		—			—
	Professional fees		(2,525	)		(7,813	)		(21,182	)		—
	Write-off of Old Notes deferred loan costs		—			(8,258	)		—			—
	Total reorganization items, net	$	(2,525	)	$	233,458		$	(21,182	)	$	—

Variable_Interest_Entities_and

Variable Interest Entities and Noncontrolling Interests	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Variable Interest Entities and Noncontrolling Interests	'	'
	Note 2—Variable Interest Entities and Noncontrolling Interests	Note 5—Variable Interest Entities and Noncontrolling Interests
	During the nine months ended September 30, 2013, the Company formed two joint ventures, Lyon Whistler, LLC and Brentwood Palmilla Owner, LLC, and during the year ended December 31, 2012, the Company formed one joint venture, Lyon Branches, LLC, for the purpose of land development and homebuilding activities which we have determined to be VIEs. The Company, as the managing member, has the power to direct the activities of the VIEs since it manages the daily operations and has exposure to the risks and rewards of the VIEs, which is based on the division of income and loss per the joint venture agreements. Therefore, the Company is the primary beneficiary of the joint ventures, and the VIEs were consolidated as of September 30, 2013 and December 31, 2012.	The Company accounts for variable interest entities in accordance with ASC 810, Consolidation (“ASC 810”). Under ASC 810, a variable interest entity (“VIE”) is created when: (a) the equity investment at risk in the entity is not sufficient to permit the entity to finance its activities without additional subordinated financial support provided by other parties, including the equity holders; (b) the entity’s equity holders as a group either (i) lack the direct or indirect ability to make decisions about the entity, (ii) are not obligated to absorb expected losses of the entity or (iii) do not have the right to receive expected residual returns of the entity; or (c) the entity’s equity holders have voting rights that are not proportionate to their economic interests, and the activities of the entity involve or are conducted on behalf of the equity holder with disproportionately few voting rights. If an entity is deemed to be a VIE pursuant to ASC 810, the enterprise that has both (i) the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and (ii) the obligation to absorb the expected losses of the entity or right to receive benefits from the entity that could be potentially significant to the VIE is considered the primary beneficiary and must consolidate the VIE. In accordance with ASC 810, we perform ongoing reassessments of whether an enterprise is the primary beneficiary of a VIE.
	As of September 30, 2013, the assets of the consolidated VIEs totaled $68.5 million, of which $3.3 million was cash and $61.0 million was real estate inventories. The liabilities of the consolidated VIEs totaled $21.8 million, primarily comprised of notes payable of $19.2 million, accounts payable and accrued liabilities.	Joint Ventures
	As of December 31, 2012, the assets of the consolidated VIEs totaled $24.7 million, of which $1.1 million was cash and $20.4 million was real estate inventories. The liabilities of the consolidated VIEs totaled $6.4 million, primarily comprised of accounts payable and accrued liabilities. The Company recorded a $1.6 million valuation adjustment to the noncontrolling interest account on one VIE in accordance with the adoption of ASC 852.	As of December 31, 2012 and 2011, the Company had two and one joint ventures, respectively, which were deemed to be VIEs under ASC 810 for which the Company is considered the primary beneficiary. The Company manages the joint ventures, by using its sales, development and operations teams and has significant control over these projects and therefore the power to direct the activities that most significantly impact the joint venture’s performance, in addition to being obligated to absorb expected losses or receive benefits from the joint venture, and therefore the Company is deemed to be the primary beneficiary of these VIEs.
		These joint ventures are each engaged in homebuilding and land development activities. Certain of these joint ventures have not obtained construction financing from outside lenders, but are financing their activities through equity contributions from each of the joint venture partners. The Company has no rights, nor does the Company have any obligation with respect to the liabilities of the VIEs, and none of the Company’s assets serve as collateral for the creditors of these VIEs. The assets of the joint ventures are the sole collateral for the liabilities of the joint ventures and as such, the creditors and equity investors of these joint ventures have no recourse to assets of the Company held outside of these joint ventures. Creditors of these VIEs have no recourse against the general credit of the Company. The liabilities of each VIE are restricted to the assets of each VIE. Additionally, the creditors of the Company have no access to the assets of the VIEs. Income allocations and cash distributions to the Company are based on predetermined formulas between the Company and their joint venture partners as specified in the applicable partnership or operating agreements. The Company generally receives, after partners’ priority returns and return of partners’ capital, approximately 50% of the profits and cash flows from the joint ventures.
		During the year ended December 31, 2012, the Company formed a joint venture, Lyon Branches, LLC, for the purpose of land development and homebuilding activities. The Company, as the managing member, has the power to direct the activities of the VIE since it manages the daily operations and has exposure to the risks and rewards of the VIE, as based on the division of income and loss per the joint venture agreement. Therefore, the Company is the primary beneficiary of the joint venture, and the VIE was consolidated as of December 31, 2012.
		As of December 31, 2012, the assets of the consolidated VIEs totaled $24.7 million, of which $1.1 million was cash and $20.4 was real estate inventories. The liabilities of the consolidated VIEs totaled $6.4 million, primarily comprised of accounts payable and accrued liabilities. The Company recorded a $1.6 million valuation adjustment to the noncontrolling interest account on one VIE in accordance with the adoption of ASC 852.
		As of December 31, 2011, the assets of the consolidated VIEs totaled $14.0 million, of which $2.1 million was cash and $8.7 million was real estate inventories. The liabilities of the consolidated VIEs totaled $1.3 million, primarily comprised of accounts payable and accrued liabilities.

Segment_Information

Segment Information	9 Months Ended																	12 Months Ended
	Sep. 30, 2013																	Dec. 31, 2012
Segment Information	'																	'
	Note 3—Segment Information																	Note 6—Segment Information
	The Company operates one principal homebuilding business. In accordance with FASB ASC Topic 280, Segment Reporting (“ASC 280”), the Company has determined that each of its operating divisions is an operating segment.																	The Company operates one principal homebuilding business. In accordance with FASB ASC Topic 280, Segment Reporting (“ASC 280”), the Company has determined that each of its operating divisions is an operating segment.
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision-maker in deciding how to allocate resources and in assessing performance. The Company’s Executive Chairman, Chief Executive Officer and Chief Operating Officer have been identified as the chief operating decision makers. The Company’s chief operating decision makers direct the allocation of resources to operating segments based on the profitability and cash flows of each respective segment.																	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision-maker in deciding how to allocate resources and in assessing performance. The Company’s Executive Chairman, Chief Executive Officer and Chief Operating Officer have been identified as the chief operating decision makers. The Company’s chief operating decision makers direct the allocation of resources to operating segments based on the profitability and cash flows of each respective segment.
																		The Company’s homebuilding operations design, construct and sell a wide range of homes designed to meet the specific needs in each of its markets. In accordance with the aggregation criteria defined by ASC 280, the Company’s homebuilding operating segments have been grouped into five reportable segments: Southern California, consisting of an operating division with operations in Orange, Los Angeles, San Bernardino and San Diego counties; Northern California, consisting of an operating division with operations in Contra Costa, Sacramento, San Joaquin, Santa Clara, Solano and Placer counties; Arizona, consisting of operations in the Phoenix, Arizona metropolitan area; Nevada, consisting of operations in the Las Vegas, Nevada metropolitan area; and Colorado, consisting of operations in the Denver, Colorado metropolitan area, Fort Collins, and Granby, Colorado. Colorado does not meet the quantitative requirements for segment reporting per ASC 280, however management believes that information about the segment is useful to readers of the financial statements.
	The Company’s homebuilding operations design, construct and sell a wide range of homes designed to meet the specific needs in each of its markets. In accordance with the aggregation criteria defined by ASC 280, the Company’s homebuilding operating segments have been grouped into five reportable segments: Southern California, consisting of an operating division with operations in Orange, Los Angeles, San Bernardino and San Diego counties; Northern California, consisting of an operating division with operations in Contra Costa, San Joaquin and Santa Clara counties; Arizona, consisting of operations in the Phoenix, Arizona metropolitan area; Nevada, consisting of operations in the Las Vegas, Nevada metropolitan area; and Colorado, consisting of operations in the Denver, Colorado metropolitan area, Fort Collins, and Granby, Colorado markets.
	Corporate develops and implements strategic initiatives and supports the Company’s operating divisions by centralizing key administrative functions such as finance and treasury, information technology, risk management and litigation and human resources.																	Corporate develops and implements strategic initiatives and supports the Company’s operating divisions by centralizing key administrative functions such as finance and treasury, information technology, risk management and litigation and human resources.
	Segment financial information relating to the Company’s operations was as follows (in thousands):																	Segment financial information relating to the Company’s operations was as follows (in thousands):
			Successor												Predecessor					Successor			Predecessor
			Three			Three			Nine			Period from			Period from					Period from			Period from			Year Ended December 31,
			Months  Ended			Months  Ended			Months  Ended			February 25			January 1					25-Feb			1-Jan
			September 30,			September 30,			September 30,			through			through					through			through
			2013			2012			2013			September 30,			February  24,					December 31,			February 24,
												2012			2012					2012			2012			2011			2010
	Operating revenue:																	Operating revenue:
	Southern California		$	49,681		$	36,097		$	105,231		$	68,187		$	7,759		Southern California		$	116,619		$	7,759		$	130,737		$	206,241
	Northern California			27,790			26,181			56,115			131,747			11,014		Northern California			154,684			11,014			54,141			56,095
	Arizona			31,253			17,157			86,431			38,634			4,316		Arizona			58,714			4,316			20,074			16,595
	Nevada			23,920			13,552			56,421			24,007			2,481		Nevada			37,307			2,481			21,871			15,767
	Colorado			18,186			—			58,923			—			—		Colorado			5,436			—			—			—
	Total operating revenue		$	150,830		$	92,987		$	363,121		$	262,575		$	25,570		Total operating revenue		$	372,760		$	25,570		$	226,823		$	294,698
			Successor												Predecessor					Successor			Predecessor
			Three			Three			Nine			Period from			Period from					Period from			Period from			Year Ended December 31,
			Months  Ended			Months  Ended			Months  Ended			February 25			January 1					February 25			January 1
			September 30,			September 30,			September 30,			through			through					through			through
			2013			2012			2013			September 30,			February  24,					December 31,			February 24,
												2012			2012					2012			2012			2011			2010
	Net income (loss):																	(Loss) income before (provision) benefit from income taxes:
	Southern California		$	10,027		$	889		$	15,453		$	(1,840	)	$	(19,131	)	Southern California		$	3,345		$	(19,131	)	$	(26,406	)	$	(83,176	)
	Northern California			4,706			4,577			8,740			12,169			6,195		Northern California			16,179			6,195			(6,307	)		(41	)
	Arizona			4,224			353			9,032			64			9,928		Arizona			2,073			9,928			(95,184	)		(26,887	)
	Nevada			3,355			1			5,881			(1,637	)		(1,738	)	Nevada			(1,146	)		(1,738	)		(30,500	)		(21,449	)
	Colorado			209			—			1,654			—			—		Colorado			130			—			—			—
	Corporate (1)			(11,841	)		(5,354	)		(23,473	)		(14,329	)		233,243		Corporate			(27,431	)		233,243			(34,491	)		(4,314	)
	Net income (loss)		$	10,680		$	466		$	17,287		$	(5,573	)	$	228,497		(Loss) income before (provision)		$	(6,850	)	$	228,497		$	(192,888	)	$	(135,867	)
																		benefit from income taxes
																		(Loss) income before (provision) benefit from income taxes includes the following pretax inventory impairment charges recorded in the following segments (in thousands):
			Successor
			September 30,			December 31,
			2013			2012														Successor			Predecessor
	Homebuilding assets:																			Period from			Period from			Year Ended			Year Ended
	Southern California		$	281,967		$	195,688													February 25			January 1			December 31,			December 31,
	Northern California			130,616			31,293													through			through			2011			2010
	Arizona			169,581			173,847													December 31,			February 24,
	Nevada			76,353			51,141													2012			2012
	Colorado			36,769			37,668											Southern California		$	—		$	—		$	17,962		$	70,801
	Corporate (2)			103,667			91,510											Northern California			—			—			2,074			3,103
																		Arizona			—			—			87,607			22,409
	Total homebuilding assets		$	798,953		$	581,147											Nevada			—			—			20,671			15,547
																		Colorado			—			—			—			—
	-1	Includes the Company’s consolidated Provision for income taxes of approximately $6.4 million and $6.4 million for the three and nine months ended September 30, 2013.																Total impairment loss on real estate assets		$	—		$	—		$	128,314		$	111,860
	-2	Comprised primarily of cash and cash equivalents, receivables, deferred loan costs, and other assets.
																				Successor			Predecessor
																				December 31,
																				2012			2011
																		Homebuilding assets:
																		Southern California		$	195,688		$	182,781
																		Northern California			31,293			105,298
																		Arizona			173,847			129,920
																		Nevada			51,141			42,183
																		Colorado			37,668			—
																		Corporate (1)			91,510			36,769
																		Total homebuilding assets		$	581,147		$	496,951
																		-1	Comprised primarily of cash and cash equivalents, receivables, deferred loan costs, and other assets.

Real_Estate_Inventories

Real Estate Inventories	9 Months Ended						12 Months Ended
	Sep. 30, 2013						Dec. 31, 2012
Real Estate Inventories	'						'
	Note 4—Real Estate Inventories						Note 7—Real Estate Inventories
	Real estate inventories consist of the following (in thousands):						Real estate inventories consist of the following (in thousands):
			Successor						Successor		Predecessor
			September 30,		December 31,				December 31,
			2013		2012				2012		2011
	Real estate inventories owned:						Real estate inventories owned:
	Land deposits		$	40,816	$	31,855	Land deposits		$	31,855	$	26,939
	Land and land under development			439,401		318,327	Land and land under development			318,327		267,348
	Homes completed and under construction			138,500		50,847	Homes completed and under construction			50,847		90,824
	Model homes			21,445		20,601	Model homes			20,601		13,423
	Total		$	640,162	$	421,630	Total		$	421,630	$	398,534
	Real estate inventories not owned: (1)						Real estate inventories not owned: (1)
	Other land options contracts — land banking arrangement		$	20,738	$	39,029	Other land options contracts — land banking arrangement		$	39,029	$	47,408
	-1	Represents the consolidation of a land banking arrangement. Although the Company is not obligated to purchase the lots, based on certain factors, the Company has determined that it is economically compelled to purchase the lots in the land banking arrangement. Amounts are net of deposits.					-1	Represents the consolidation of a land banking arrangement which does not obligate the Company to purchase the lots, however, based on certain factors, the Company has determined it is economically compelled to purchase the lots in the land banking arrangement, which has been consolidated. Amounts are net of deposits.
	As of February 24, 2012, the Company made fair value adjustments to inventory in accordance with fresh start accounting. During the nine months ended September 30, 2013, and the period from February 25, 2012 through September 30, 2012, the Company did not record any impairments.						The Company accounts for its real estate inventories under FASB ASC 360 Property, Plant, & Equipment (“ASC 360”).
							ASC 360 requires impairment losses to be recorded on real estate inventories when indicators of impairment are present and the undiscounted cash flows estimated to be generated by real estate inventories are less than the carrying amount of such assets. Indicators of impairment include a decrease in demand for housing due to softening market conditions, competitive pricing pressures, which reduce the average sales price of homes including an increase in sales incentives offered to buyers, slowing sales absorption rates, decreases in home values in the markets in which the Company operates, significant decreases in gross margins and a decrease in project cash flows for a particular project.
							For land, construction in progress, completed inventory, including model homes, and inventories not owned, the Company estimates expected cash flows at the project level by maintaining current budgets using recent historical information and current market assumptions. The Company updates project budgets and cash flows of each real estate project on a quarterly basis to determine whether the estimated remaining undiscounted future cash flows of the project are more or less than the carrying amount (net book value) of the asset. If the undiscounted cash flows are more than the net book value of the project, then there is no impairment. If the undiscounted cash flows are less than the net book value of the asset, then the asset is deemed to be impaired and is written-down to its fair value.
							Fair value represents the amount at which an asset could be bought or sold in a current transaction between willing parties (i.e., other than a forced or liquidation sale). Management determines the estimated fair value of each project by determining the present value of estimated future cash flows at discount rates that are commensurate with the risk of each project and each domain, market or sub-market or may use recent appraisals if they more accurately reflect fair value. The estimation process involved in determining if assets have been impaired and in the determination of fair value is inherently uncertain because it requires estimates of future revenues and costs, as well as future events and conditions. Estimates of revenues and costs are supported by the Company’s budgeting process, and are based on recent sales in backlog, pricing required to get the desired pace of sales, pricing of competitive projects, incentives offered by competitors and current estimates of costs of development and construction or current appraisals.
							The Company engaged a third-party valuation firm to assist with the analysis of the fair value of the entity, and respective assets and liabilities in connection with its reorganization. In conjunction with the valuation of all of the assets of the Company, the Company re-set value on certain land holdings in the early stages of development, based on: (i) “as-is” development stages of the property instead of a discounted cash flow approach, (ii) relative comparables on similar stage properties that had recently sold, on a per acre basis, and (iii) location of the property, among other factors. Since the valuation was completed near December 31, 2011, management used such valuation to evaluate the book value as of December 31, 2011.
							Under the provisions of FASB ASC 360, the Company is required to make certain assumptions to estimate undiscounted future cash flows of a project, which include: (i) estimated sales prices, including sales incentives, (ii) anticipated sales absorption rates and sales volume, (iii) project costs incurred to date and the estimated future costs of the project based on the project budget, (iv) the carrying costs related to the time a project is actively selling until it closes the final unit in the project, and (v) alternative strategies including selling the land to a third-party or temporarily suspending development at the project. Each project has different assumptions and is based on management’s assessment of the current market conditions that exist in each project location. The Company’s assumptions include moderate absorption increases in certain projects beginning in 2013. In addition, the Company has assumed some moderate reduction in sales incentives in certain projects in certain markets beginning in 2013.
							The assumptions and judgments used by the Company in the estimation process to determine the future undiscounted cash flows of a project and its fair value are inherently uncertain and require a substantial degree of judgment. The realization of the Company’s real estate inventories is dependent upon future uncertain events and market conditions. Due to the subjective nature of the estimates and assumptions used in determining the future cash flows of a project, actual results could differ materially from current estimates.
							Management assesses land deposits for impairment when estimated land values are deemed to be less than the agreed upon contract price. The Company considers changes in market conditions, the timing of land purchases, the ability to renegotiate with land sellers, the terms of the land option contracts in question, the availability and best use of capital, and other factors. The Company records abandoned land deposits and related pre-acquisition costs in cost of sales-lots, land and other in the consolidated statements of operations in the period that it is abandoned.
							As of February 24, 2012, the Company made fair value adjustments to inventory in accordance with fresh start accounting. During the period from February 25, 2012 through December 31, 2012, the Company did not record any impairments.
							During the year ended December 31, 2011, the Company recorded impairment loss on real estate assets of $128.3 million. The impairment loss related to land under development and homes completed and under construction recorded during the year ended December 31, 2011, resulted from (i) in certain projects, a decrease in home sales prices related to increased incentives and (ii) a decrease in sales absorption rates which increased the length of time of the project and increased period costs related to the project. The impairment loss related to land held for future development or sold incurred during the year ended December 31, 2011, resulted from the reduced value of the land in the project. The Company values land held for future development using, (i) projected cash flows with the strategy of selling the land, on a finished or unfinished basis, or building out the project, (ii) considering recent, legitimate offers received, (iii) prices for land in recent comparable sales transactions, and other factors. For three of the Company’s projects which are entitled land categorized as “land held for future development” in the table above, the Company engaged a third-party valuation firm to value the land of each project, on an as-is basis, using several factors including the existing land sale market and market comparables as a barometer for each project.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2012
Goodwill	'
	Note 8—Goodwill
	Goodwill of $14.2 million at December 31, 2012 represents the excess of our enterprise value upon emergence over the fair value of our net tangible and identifiable intangible assets. The Company recorded goodwill of $14.2 million as of February 24, 2012 in connection with fresh start accounting (refer to Notes 2, 3, and 4 for further details relating to fresh start accounting and valuation of goodwill).
	Goodwill by operating segment as of December 31, 2012 and 2011 is as follows (in thousands):
		Successor		Predecessor
		December 31,
		2012		2011
	Southern California	$	4,885	$	—
	Northern California		1,916		—
	Arizona		5,951		—
	Nevada		1,457		—
	Colorado		—		—
	Total goodwill	$	14,209	$	—

Intangibles

Intangibles	12 Months Ended
	Dec. 31, 2012
Intangibles	'
	Note 9—Intangibles
	The carrying value and accumulated amortization of intangible assets at December 31, 2012, by major intangible asset category, is as follows (in thousands):
		Successor
		December 31, 2012
		Carrying		Accumulated			Net
		Value		Amortization			Carrying
							Amount
	Construction management contracts	$	4,640	$	(1,295	)	$	3,345
	Homes in backlog		4,937		(4,169	)		768
	Joint venture management fee contracts		800		(293	)		507
	Total intangibles	$	10,377	$	(5,757	)	$	4,620
	Amortization expense related to intangible assets for the period from February 25, 2012 through December 31, 2012 was $5.8 million. There was no amortization expense related to intangible assets for the period from January 1, 2012 through February 24, 2012 or prior, since intangible assets of $9.5 million were recorded in conjunction with ASC 852 and intangible assets of $0.9 million were recorded in conjunction with the purchase of Village Homes on December 7, 2012.
	Estimated future amortization expense related to intangible assets is as follows (in thousands):
		Total
		Amortization
	2013	$	1,725
	2014		1,244
	2015		1,651
	Total	$	4,620
	The weighted average remaining useful life of intangible assets as of December 31, 2012 is 24 months.

Senior_Notes_and_Secured_Indeb

Senior Notes and Secured Indebtedness	9 Months Ended																			12 Months Ended
	Sep. 30, 2013																			Dec. 31, 2012
Senior Notes and Secured Indebtedness	'																			'
	Note 5—Senior Notes and Secured Indebtedness																			Note 10—Senior Notes and Secured Indebtedness
																				Notes payable consist of the following (in thousands):
		Successor
		September 30,			December 31,																Successor			Predecessor
		2013			2012																December 31,
	Senior notes:																				2012			2011
	8 1/2% Senior Notes due November 15, 2020	$	325,000		$	325,000														Notes payable:
	Notes payable:																			Notes payable	$	13,248		$	74,009
	Revolving lines of credit	$	—		$	—
	Construction notes payable		19,233			13,248														Senior Notes:
	Seller financing		16,238			—														8  1/2% Senior Notes due November 15, 2020		325,000			—
																				Senior Secured Term Loan due Janaury 31, 2015		—			206,000
	Total notes payable	$	35,471		$	13,248														7  5/8% Senior Notes due December 15, 2012		—			66,704
																				10  3/4% Senior Notes due April 1, 2013		—			138,912
	Total senior notes and notes payable	$	360,471		$	338,248														7  1/2% Senior Notes due February 15, 2014		—			77,867
																				Total Senior Notes		325,000			489,483
	As of September 30, 2013, the maturities of the Notes payable and 8 1/2% Senior Notes are as follows (in thousands):
																				Total notes payable and Senior Notes	$	338,248		$	563,492
	Year Ending December 31,																			The maturities of the Notes Payable and 8 ½ Senior Notes are as follows as of December 31, 2012 (in thousands):
	2013	$	—
	2014		1,762
	2015		14,476																	Year Ended December 31,
	2016		19,233																	2013	$	—
	2017		—																	2014		—
	Thereafter		325,000																	2015		13,248
																				2016		—
		$	360,471																	2017		—
																				Thereafter		325,000
	Senior Notes
	8 1/2% Senior Notes Due 2020																				$	338,248
	On November 8, 2012, William Lyon Homes, Inc., a California corporation and wholly-owned subsidiary of the Company (“California Lyon”) completed its offering of 8 1/2% Senior Notes due 2020, or the New Notes, in an aggregate principal amount of $325 million. The New Notes were issued at 100% of their aggregate principal amount. The Company used the net proceeds from the sale of the New Notes, together with cash on hand, to refinance the Company’s (i) $235 million 10.25% Senior Secured Term Loan due 2015, (ii) approximately $76 million in aggregate principal amount of 12% Senior Subordinated Secured Notes due 2017, (iii) approximately $11 million in principal amount of project related debt, and (iv) to pay accrued and unpaid interest thereon.
	As of both September 30, 2013 and December 31, 2012, the outstanding principal amount of the New Notes was $325 million. The New Notes bear interest at an annual rate of 8.5% per annum and is payable semiannually in arrears on May 15 and November 15, and mature on November 15, 2020. The New Notes are senior unsecured obligations of California Lyon and are unconditionally guaranteed on a senior subordinated secured basis by Parent and by certain of Parent’s existing and future restricted subsidiaries. The New Notes and the guarantees rank senior to all of California Lyon’s and the guarantors’ existing and future unsecured senior debt and senior in right of payment to all of California Lyon’s and the guarantors’ future subordinated debt. The New Notes and the guarantees are and will be effectively junior to any of California Lyon’s and the guarantors’ existing and future secured debt.																			8.5% Senior Notes Due 2020
	On or after November 15, 2016, California Lyon may redeem all or a portion of the New Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of the principal amount) set forth below plus accrued and unpaid interest to the applicable redemption date, if redeemed during the 12-month period beginning on November 15 of the years indicated below:																			On November 8, 2012, William Lyon Homes, Inc., a California corporation and wholly-owned subsidiary of the Company (“California Lyon”) completed its offering of 8.5% Senior Notes due 2020, or the New Notes, in an aggregate principal amount of $325 million. The New Notes were issued at 100% of their aggregate principal amount. The Company used the net proceeds from the sale of the New Notes, together with cash on hand, to refinance the Company’s (i) $235 million 10.25% Senior Secured Term Loan due 2015 (“Amended Term Loan”), (ii) approximately $76 million in aggregate principal amount of 12% Senior Subordinated Secured Notes due 2017 (“Old Notes”), (iii) approximately $11 million in principal amount of project related debt, and (iv) to pay accrued and unpaid interest thereon.
																				As of December 31, 2012, the outstanding principal amount of the New Notes is $325 million. The New Notes bear interest at an annual rate of 8.5% per annum and is payable semiannually in arrears on May 15 and November 15, commencing on May 15, 2013, and mature on November 15, 2020. The New Notes are senior unsecured obligations of California Lyon and are unconditionally guaranteed on a senior subordinated secured basis by Parent and by certain of Parent’s existing and future restricted subsidiaries. The New Notes and the guarantees rank senior to all of California Lyon’s and the guarantors’ existing and future unsecured senior debt and senior in right of payment to all of California Lyon’s and the guarantors’ future subordinated debt. The New Notes and the guarantees are and will be effectively junior to any of California Lyon’s and the guarantors’ existing and future secured debt.
																				On or after November 15, 2016, California Lyon may redeem all or a portion of the New Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of the principal amount) set forth below plus accrued and unpaid interest to the applicable redemption date, if redeemed during the 12-month period beginning on November 15 of the years indicated below:
	Year	Percentage
	2016		104.25	%
	2017		102.125	%																Year	Percentage
	2018 and thereafter		100	%																2016		104.25	%
	Prior to November 15, 2016, the New Notes may be redeemed in whole or in part at a redemption price equal to 100% of the principal amount plus a “make-whole” premium, and accrued and unpaid interest to, the redemption date.																			2017		102.125	%
	In addition, any time prior to November 15, 2015, California Lyon may, at its option on one or more occasions, redeem New Notes in an aggregate principal amount not to exceed 35% of the aggregate principal amount of the New Notes issued prior to such date at a redemption price (expressed as a percentage of principal amount) of 108.5%, plus accrued and unpaid interest to the redemption date, with an amount equal to the net cash proceeds from one or more equity offerings.																			2018 and thereafter		100	%
	The indenture governing the New Notes (the “Indenture”) contains covenants that limit the ability of the Company and its restricted subsidiaries to, among other things: (i) incur or guarantee certain additional indebtedness; (ii) pay dividends or make other distributions or repurchase stock; (iii) make certain investments; (iv) sell assets; (v) incur liens; (vi) enter into agreements restricting the ability of the Company’s restricted subsidiaries to pay dividends or transfer assets; (vii) enter into transactions with affiliates; (viii) create unrestricted subsidiaries; and (viii) consolidate, merge or sell all or substantially all of the Company’s and California Lyon’s assets. These covenants are subject to a number of important exceptions and qualifications as described in the Indenture. The Company was in compliance with all such covenants as of September 30, 2013.																			Prior to November 15, 2016 the New Notes may be redeemed in whole or in part at a redemption price equal to 100% of the principal amount plus a “make-whole” premium, and accrued and unpaid interest to, the redemption date.
																				In addition, any time prior to November 15, 2015, California Lyon may, at its option on one or more occasions, redeem New Notes in an aggregate principal amount not to exceed 35% of the aggregate principal amount of the New Notes issued prior to such date at a redemption price (expressed as a percentage of principal amount) of 108.5%, plus accrued and unpaid interest to the redemption date, with an amount equal to the net cash proceeds from one or more equity offerings.
	Notes Payable																			The indenture governing the New Notes (the “Indenture”) contains covenants that limit the ability of the Company and its restricted subsidiaries to, among other things: (i) incur or guarantee certain additional indebtedness; (ii) pay dividends or make other distributions or repurchase stock; (iii) make certain investments; (iv) sell assets; (v) incur liens; (vi) enter into agreements restricting the ability of the Company’s restricted subsidiaries to pay dividends or transfer assets; (vii) enter into transactions with affiliates; (viii) create unrestricted subsidiaries; and (viii) consolidate, merge or sell all or substantially all of the Company’s and California Lyon’s assets. These covenants are subject to a number of important exceptions and qualifications as described in the Indenture. The Company is in compliance with all such covenants as of December 31, 2012.
	Revolving Lines of Credit																			Amended Senior Secured Term Loan
	On August 7, 2013, California Lyon and Parent entered into a credit agreement providing for a revolving credit facility of up to $100 million (the “Revolver”). The Revolver will mature on August 5, 2016, unless terminated earlier pursuant to the terms of the Revolver. The Revolver contains an uncommitted accordion feature under which its aggregate principal amount can be increased to up to $125 million under certain circumstances, as well as a sublimit of $50 million for letters of credit. The Revolver contains various covenants, including financial covenants relating to tangible net worth, leverage, liquidity and interest coverage, as well as a limitation on investments in joint ventures and non-guarantor subsidiaries.																			Prior to completing its offering of the New Notes, California Lyon was a party to that certain Amended and Restated Senior Secured Term Loan Agreement (the “Amended Term Loan Agreement”), dated February 25, 2012. The Senior Secured Term Loan was renegotiated into the terms below in conjunction with the Plan of Reorganization as discussed in Notes 2, 3, and 4.
	The Revolver contains customary events of default, subject to cure periods in certain circumstances, that would result in the termination of the commitment and permit the lenders to accelerate payment on outstanding borrowings and require cash collateralization of letters of credit, including: nonpayment of principal, interest and fees or other amounts; violation of covenants; inaccuracy of representations and warranties; cross default to certain other indebtedness; unpaid judgments; and certain bankruptcy and other insolvency events. If a change in control of the Company occurs, the lenders may terminate the commitment and require that California Lyon repay outstanding borrowings under the Revolver and cash collateralize letters of credit. Interest rates on borrowings generally will be based on either LIBOR or a base rate, plus the applicable spread. The commitment fee on the unused portion of the Facility currently accrues at an annual rate of 0.50%.																			The Amended Term Loan Agreement provided for a first lien secured term loan of $235.0 million, secured by substantially all of the assets of California Lyon, Parent (excluding stock in California Lyon) and certain wholly-owned subsidiaries of Parent. The Amended Term Loan was guaranteed by Parent and certain wholly-owned subsidiaries of Parent.
	Borrowings under the Revolver, the availability of which is subject to a borrowing base formula, are required to be guaranteed by the Company and certain of the Company’s wholly-owned subsidiaries, are secured by a pledge of all equity interests held by such guarantors, and may be used for general corporate purposes. As of September 30, 2013, the Revolver was undrawn.																			The Amended Term Loan bore interest at a rate of 10.25% per annum. Prior to its repayment in conjunction with the New Notes offering, the Amended Term Loan was scheduled to mature on January 31, 2015. In addition, there was no pre-payment penalty associated with the Amended Term Loan.
	On March 5, 2013, California Lyon entered into a Revolving Line of Credit Loan Agreement (the “CB&T Loan Agreement”), with California Bank & Trust (“CB&T”), providing for a revolving line of credit of $30.0 million (the “CB&T Loan”). The CB&T Loan, as amended, provides California Lyon with funds for the development of residential lots, the construction of existing and future residential home projects within the states of California, Arizona, Nevada and Colorado, the issuance of letters of credit for the payment of costs incurred or associated with those projects and other general corporate purposes. In connection with the execution of the CB&T Loan Agreement, California Lyon issued a promissory note (the “CB&T Promissory Note”), and together with the CB&T Loan Agreement and any ancillary documents and agreements executed pursuant to the CB&T Loan Agreement, (the “CB&T Loan Documents”), in favor of CB&T. California Lyon’s obligations under the CB&T Loan are secured by, among other things, a first lien on and security interest in all the real and personal property comprising each qualified project that is secured by the CB&T Loan. Borrowings under the CB&T Loan Agreement bore interest, payable monthly, at California Lyon’s option of either (i) a fixed rate at LIBOR plus 3.00% per annum or (ii) a variable rate at the Prime Rate, as adjusted by CB&T in accordance with the CB&T Loan Agreement, plus 1.00% per annum. The floor interest rate for borrowings under the CB&T Loan Agreement range from 4.25% to 5.00%, depending on California Lyon’s total debt to tangible net worth ratio. Beginning on March 5, 2015, the maximum amount available under the CB&T Loan would have been reduced by $7.5 million every 90 days until the CB&T Loan matures. The CB&T Loan was scheduled to mature on March 5, 2016.
	All outstanding borrowings under the CB&T Loan may, at the option of CB&T, be accelerated and become immediately due and payable in the event of a default under the CB&T Loan Documents, which includes, among other things, the following events (subject to certain cure periods, as applicable): (i) the failure by California Lyon to pay any monetary amount when due under any CB&T Loan Document; (ii) the breach of certain covenants under the CB&T Loan Documents; (iii) any representations contained in the CB&T Loan Documents being materially misleading or false when made; (iv) defaults under certain other monetary obligations; (v) bankruptcy matters; (vi) litigation or proceedings that could constitute a material adverse change on California Lyon or a qualified project or (vii) certain judgments. The CB&T Loan Documents also contained negative covenants which restrict or limit California Lyon from, among other things, the following: (a) consolidating or merging with any person unless California Lyon is the surviving entity; (b) changing its fiscal year or accounting methods; (c) changing the character of California Lyon’s business; (d) suffering any change in the legal or beneficial ownership of any capital stock in California Lyon; (e) making loans or advances; (f) granting or continuing liens; (g) incurring debt and (h) acquiring assets.																			The Company recognized a loss of $1.9 million upon the early extinguishment of the Amended Term Loan related to unamortized debt issuance costs. The loss is included in (loss) gain on extinguishment of debt in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012.
	In March 2013, one of the outstanding construction loans payable and its underlying collateral was rolled into the CB&T Loan. In July 2013, the Company repaid all of the outstanding balance of the CB&T loan. On October 30, 2013, the Company terminated the CB&T Loan.																			Senior Secured Term Loan
																				Prior to the Plan of Reorganization, as discussed in Notes 2, 3, and 4, California Lyon was a party to a certain Senior Secured Term Loan Agreement (the “Term Loan Agreement”), dated October 20, 2009. As of December 31, 2011, the Term Loan outstanding balance was $206.0 million.
	Construction Notes Payable																			The Term Loan had interest at a rate of 14.0% and was scheduled to mature on October 20, 2014. However, California Lyon had also agreed that, upon any repayment of any portion of the principal amount under the Term Loan (whether or not at maturity), California Lyon would also pay an exit fee equal to the difference (if positive) between (x) the interest that would have been accrued and been then payable on the repaid portion if the interest rate under the Term Loan Agreement were 15.625% and (y) the internal rate of return realized by the Lenders on such repaid portion, taking into account all cash amounts actually received by the Lenders with respect thereto, including the loan fee and interest payments, other than any make whole payments described below.
	In June 2013, the Company entered into a construction note payable agreement. The agreement has total availability under the facility of $28.0 million, to be drawn for land development and construction on one of its joint venture projects. The loan matures in June 2016 and bears interest at the prime rate +0.5%, with a rate floor of 4.0%, which was the interest rate as of September 30, 2013. As of September 30, 2013, the Company had borrowed $19.2 million under this facility. The loan will be repaid with proceeds from home closings of the project, is secured by the underlying project, and is guaranteed by the Company.																			Upon any prepayment of any portion of the Term Loan prior to its scheduled maturity (other than any prepayment required in connection with a payment of all or any portion of the outstanding principal balance of any of the indentures governing the Term Loan), the Term Loan Agreement provided that California Lyon make a “make whole payment” equal to an amount, if positive, of the present value of all future payments of interest which would become due with respect to such prepaid amount from the date of prepayment thereof through and including the maturity date, discounted at a rate of 14%.
	In September 2012, the Company entered into two construction notes payable agreements. The first agreement has total availability under the facility of $19.0 million, to be drawn for land development and construction on one of its wholly-owned projects. The loan had an original maturity date in September 2015 and bore interest at the prime rate +1.0%, with a rate floor of 5.0%. In March 2013, this loan and the underlying collateral was rolled into the CB&T Loan Agreement, defined and discussed above. As of December 31, 2012, the Company had borrowed $7.8 million under this facility.																			The Company was in technical default of the term loan as of December 31, 2011, due to (a) expiration of the tangible net worth covenant waiver on October 27, 2011 and (b) a cross default under the senior notes indentures. The term loan was restructured into the Amended Term Loan as described above.
	The second September 2012 construction note payable agreement has total availability under the facility of $17.0 million, to be drawn for land development and construction on one of its joint venture projects. The loan matures in March 2015 and bears interest at prime rate +1%, with a rate floor of 5.0%, which was the interest rate as of September 30, 2013. During the three months ended September 30, 2013, the Company repaid the entire outstanding balance under this loan. At December 31, 2012, the Company had borrowed $5.4 million under this facility.																			Senior Subordinated Secured Notes
	Seller Financing																			Prior to completing its offering of New Notes as discussed above, pursuant to the terms of the Plan, on February 25, 2012, California Lyon issued $75.0 million principal amount of 12% Senior Subordinated Secured Notes, or the Old Notes, due February 25, 2017, in exchange for the claims held by the holders of the formerly outstanding Senior Notes of California Lyon. California Lyon received no net proceeds from this issuance.
	At September 30, 2013, the Company had $16.2 million of notes payable outstanding related to two land acquisitions for which seller financing was provided. The first note had a balance of $1.7 million as of September 30, 2013, bears interest at 3% per annum, is secured by the underlying land, and matures in March 2014. The second note had a balance of $14.5 million as of September 30, 2013, bears interest at 7% per annum, is secured by the underlying land, and matures in May 2015.																			Cash interest of 8% on the outstanding principal amount of the Old Notes was due in semi-annual installments in arrears on June 15 and December 15 of each year. The remaining interest of 4% on the outstanding principal amount of the Old Notes was payable in kind semi-annually in arrears by increasing the principal amount of the Old Notes.
	GUARANTOR AND NON-GUARANTOR FINANCIAL STATEMENTS																			The Old Notes were redeemable at the option of California Lyon at any time, in whole or in part, at a redemption price equal to 100% of the principal amount redeemed, plus accrued and unpaid interest, if any.
	The following consolidating financial information includes:																			As described above, California Lyon used a portion of the proceeds from the sale of the New Notes to refinance the Old Notes. The Old Notes were paid off as of December 31, 2012. The Company recognized a loss of $0.3 million upon the early extinguishment of the Old Notes related to an early tender premium. The loss is included in (loss) gain on extinguishment of debt in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012.
	(1) Consolidating balance sheets as of September 30, 2013 and December 31, 2012; consolidating statements of operations for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012; and consolidating statements of cash flows for the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, of (a) William Lyon Homes, as the parent, or “Delaware Lyon”, (b) William Lyon Homes, Inc., as the subsidiary issuer, or “California Lyon”, (c) the guarantor subsidiaries, (d) the non-guarantor subsidiaries and (e) William Lyon Homes, Inc. on a consolidated basis; and
	(2) Elimination entries necessary to consolidate Delaware Lyon, with William Lyon Homes, Inc. and its guarantor and non-guarantor subsidiaries.																			Senior Notes
	Delaware Lyon owns 100% of all of its guarantor subsidiaries and all guarantees are full and unconditional, joint and several. As a result, in accordance with Rule 3-10 (d) of Regulation S-X promulgated by the SEC, no separate financial statements are required for these subsidiaries as of September 30, 2013 and December 31, 2012, and for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, 2012, and the period from January 1, 2012 through February 24, 2012.																			On December 31, 2011, the Senior Notes had the following principal amounts outstanding (in thousands):
CONDENSED CONSOLIDATING BALANCE SHEET
(Unaudited)																				December 31,
September 30, 2013 (Successor)																				2011
(in thousands)																			7  5/8% Senior Notes due December 15, 2012	$	66,704
																			10  3/4% Senior Notes due April 1, 2013		138,912
																			7  1/2% Senior Notes due February 15, 2014		77,867
	Unconsolidated
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated				$	283,483
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
ASSETS																			7 5/8% Senior Notes
Cash and cash equivalents	$	—		$	77,976		$	313		$	3,633		$	—		$	81,922		On November 22, 2004, California Lyon issued $150.0 million principal amount of the 7 5/8% Senior Notes. Of the initial $150.0 million, $66.7 million in aggregate principal amount remained outstanding as of December 31, 2011.
Restricted cash		—			853			—			—			—			853		10 3/4% Senior Notes
Receivables		—			15,979			1,323			4,353			—			21,655		On March 17, 2003, California Lyon issued $250.0 million of the 10 3/4% Senior Notes at a price of 98.493% to the public, resulting in net proceeds to the Company of approximately $246.2 million. The redemption price reflected a discount to yield 11% under the effective interest method, and the notes have been reflected net of the unamortized discount in the consolidated balance sheet. Of the initial $250.0 million, $138.9 million aggregate principal amount remained outstanding as of December 31, 2011.
Real estate inventories																			10  3/4% Senior Notes Indenture Interest Payment Default
Owned		—			574,987			1,839			63,336			—			640,162		On October 31, 2011, California Lyon did not make the scheduled interest payment on the 10 3/4% Senior Notes within the 30-day grace period specified in the 10 3/4% Senior Notes Indenture, resulting in an event of default under the 10 3/4% Senior Notes Indenture, and a cross-default under the Term Loan Agreement. In the event that Holders of the 10 3/4% Senior Notes exercised their right to accelerate the 10 3/4% Senior Notes, a cross-default under the other prepetition indentures would have resulted. Since the Company was in negotiations with certain holders of the Senior Notes to reorganize and restructure the debt of the Company, the holders did not exercise their right to accelerate the 10 3/4% Senior Notes.
Not owned		—			20,738			—			—			—			20,738		7 1/2% Senior Notes
Deferred loan costs		—			8,088			—			—			—			8,088		On February 6, 2004, California Lyon issued $150.0 million principal amount of the 7 1/2% Senior Notes, resulting in net proceeds to the Company of approximately $147.6 million. Of the initial $150.0 million, $77.9 million aggregate principal amount remained outstanding as of December 31, 2011.
Goodwill		—			14,209			—			—			—			14,209		During the year ended December 31, 2010, the Company redeemed, in privately negotiated transactions, $37.3 million principal amount of its outstanding Senior Notes at a cost of $31.3 million, plus accrued interest. The net gain resulting from the redemptions, after giving effect to amortization of related deferred loan costs, was $5.6 million, and is included in (loss) gain on extinguishment of debt in the consolidated statement of operations for the year ended December 31, 2010.
Intangibles		—			3,446			—			—			—			3,446
Other assets		—			6,672			863			345			—			7,880		Notes Payable
Investments in subsidiaries		309,968			31,144			—			—			(341,112	)		—		Construction Notes Payable
Intercompany receivables		—			—			220,142			18,865			(239,007	)		—		In September 2012, the Company entered into two construction notes payable agreements. The first agreement has total availability under the facility of $19.0 million, to be drawn for land development and construction on one of its wholly-owned projects. The loan matures in September 2015 and bears interest at the Prime Rate + 1.0%, with a rate floor of 5.0%, which was the effective interest rate as of December 31, 2012. As of December 31, 2012, the Company had borrowed $7.8 million under this facility. The loan will be repaid with proceeds from home closings of the project and is secured by the underlying project. The second agreement has total availability under the facility of $17.0 million, to be drawn for land development and construction on one of its joint venture projects, which is consolidated in accordance with ASC 810 (See Note 5 for further discussion). The loan matures in March 2015 and bears interest at Prime + 1%, with a rate floor of 5.0%, which was the effective interest rate as of December 31, 2012. As of December 31, 2012, the Company had borrowed $5.4 million under this facility. The loan will be repaid with proceeds from home closings of the project and is secured by the underlying project.
																			At December 31, 2011, the Company had two construction notes payable totaling $16.0 million. One of the notes totaling $9.0 million matured in January 2012, with interest at rates based on either LIBOR or prime with an interest rate floor of 6.5%. However, in conjunction with the Plan, the construction note payable was renegotiated to mature January 2013 with an option to extend for one year to December 2013. Interest on the note was paid monthly at a rate based on LIBOR or prime, with a floor of 5.5%, and the principal was repaid ratably in quarterly installments, beginning March 31, 2012 and continuing through maturity. In November 2012, the construction note was paid in full with proceeds from the New Notes.
Total assets	$	309,968		$	754,092		$	224,480		$	90,532		$	(580,119	)	$	798,953		The other construction note had a remaining balance at December 31, 2011 of $7.0 million, and was not renegotiated in conjunction with the Plan. The note had a maturity date in May 2015 and required monthly interest payments at a fixed rate of 10.0%, with quarterly principal payments of $500,000. In November 2012, the construction note was paid in full with proceeds from the New Notes. The Company recognized a loss of $0.2 million upon the early extinguishment of the note related to the unamortized debt discount. The loss is included in (loss) gain on extinguishment of debt in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012.
																			Land Acquisition Note Payable
LIABILITIES AND EQUITY																			In October 2011, the Company secured an acquisition note payable in conjunction with the acquisition of a parcel of land in Northern California. The acquisition price of the land was $56.0 million, and the loan was for $55.0 million. The note was scheduled to mature in October 2012, and carried an interest rate of 1.5% per month, which was paid monthly on the loan. As part of the Company’s adoption of ASC 852, the loan was valued at $56.3 million as of February 24, 2012, the confirmation date of the plan. In May 2012, the Company sold the parcel of land and repaid the note in full recognizing a gain on extinguishment of debt of $1.0 million, net of amortization expense of $0.3 million. The gain is included in (loss) gain on extinguishment of debt in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012.
Accounts payable	$	—		$	16,185		$	1,005		$	2,210		$	—		$	19,400		Seller Financing
Accrued expenses		—			59,535			777			79			—			60,391		At December 31, 2011, the Company had $3.0 million of notes payable outstanding related to a land acquisition for which seller financing was provided. The note bore interest at 7% and matured in March 2012. In March 2012, the seller note was paid in full.
Liabilities from inventories not owned		—			20,738			—			—			—			20,738
Notes payable		—			14,476			1,762			19,233			—			35,471		GUARANTOR AND NON-GUARANTOR FINANCIAL STATEMENTS
8  1/2% Senior Notes		—			325,000			—			—			—			325,000		The following consolidating financial information includes:
Intercompany payables		—			229,125			—			9,881			(239,006	)		—		(1) Consolidating balance sheets as of December 31, 2012 and 2011; consolidating statements of operations for the period from February 25, 2012 through December 31, 2012, the period from January 1, 2012 through February 24, 2012, and the years ended December 31, 2011 and 2010; and consolidating statements of cash flows for the period from February 25, 2012 through December 31, 2012, the period from January 1, 2012 through February 24, 2012, and the years ended December 31, 2011 and 2010, of (a) William Lyon Homes, as the parent, or “Delaware Lyon”, (b) William Lyon Homes, Inc., as the subsidiary issuer, or “California Lyon”, (c) the guarantor subsidiaries, (d) the non-guarantor subsidiaries and (e) William Lyon Homes, Inc. on a consolidated basis; and
																			(2) Elimination entries necessary to consolidate Delaware Lyon, with William Lyon Homes, Inc. and its guarantor and non-guarantor subsidiaries.
Total liabilities		—			665,059			3,544			31,403			(239,006	)		461,000		William Lyon Homes owns 100% of all of its guarantor subsidiaries and all guarantees are full and unconditional, joint and several. As a result, in accordance with Rule 3-10 (d) of Regulation S-X promulgated by the SEC, no separate financial statements are required for these subsidiaries as of December 31, 2012 and 2011, and for the period from February 25, 2012 through December 31, 2012, the period from January 1, 2012 through February 24, 2012, and the years ended December 31, 2011 and 2010.
Equity
William Lyon Homes stockholders’ equity		309,968			89,033			220,936			31,144			(341,113	)		309,968		CONSOLIDATING BALANCE SHEET
Noncontrolling interest		—			—			—			27,985			—			27,985		December 31, 2012 (Successor)
																			(in thousands)
Total liabilities and equity	$	309,968		$	754,092		$	224,480		$	90,532		$	(580,119	)	$	798,953
																				Unconsolidated
CONDENSED CONSOLIDATING BALANCE SHEET																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
December 31, 2012 (Successor)																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
(in thousands)																			ASSETS
																			Cash and cash equivalents	$	—		$	69,376		$	65		$	1,634		$	—		$	71,075
																			Restricted cash		—			853			—			—			—			853
	Unconsolidated																		Receivables		—			11,278			296			3,215			—			14,789
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			Real estate inventories
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			Owned		—			398,952			13			22,665			—			421,630
ASSETS																			Not owned		—			39,029			—			—			—			39,029
Cash and cash equivalents	$	—		$	69,376		$	65		$	1,634		$	—		$	71,075		Deferred loan costs		—			7,036			—			—			—			7,036
Restricted cash		—			853			—			—			—			853		Goodwill		—			14,209			—			—			—			14,209
Receivables		—			11,278			296			3,215			—			14,789		Intangibles		—			4,620			—			—			—			4,620
Real estate inventories																			Other assets		—			7,437			146			323			—			7,906
Owned		—			398,952			13			22,665			—			421,630		Investments in subsidiaries		62,712			22,148			—			—			(84,860	)		—
Not owned		—			39,029			—			—			—			39,029		Intercompany receivables		—			—			207,239			18,935			(226,174	)		—
Deferred loan costs		—			7,036			—			—			—			7,036
Goodwill		—			14,209			—			—			—			14,209		Total assets	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147
Intangibles		—			4,620			—			—			—			4,620
Other assets		—			7,437			146			323			—			7,906
Investments in subsidiaries		62,712			22,148			—			—			(84,860	)		—		LIABILITIES AND EQUITY (DEFICIT)
Intercompany receivables		—			—			207,239			18,935			(226,174	)		—		Accounts payable	$	—		$	17,998		$	39		$	698		$	—		$	18,735
																			Accrued expenses		—			41,505			213			52			—			41,770
Total assets	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147		Liabilities from inventories not owned		—			39,029			—			—			—			39,029
																			Notes payable		—			7,809			—			5,439			—			13,248
LIABILITIES AND EQUITY (DEFICIT)																			8 1/2% Senior Notes		—			325,000			—			—			—			325,000
Accounts payable	$	—		$	17,998		$	39		$	698		$	—		$	18,735		Intercompany payables		—			217,146			—			9,028			(226,174	)		—
Accrued expenses		—			41,505			213			52			—			41,770
Liabilities from inventories not owned		—			39,029			—			—			—			39,029		Total liabilities		—			648,487			252			15,217			(226,174	)		437,782
Notes payable		—			7,809			—			5,439			—			13,248
8  1/2% Senior Notes		—			325,000			—			—			—			325,000		Redeemable convertible preferred stock		—			71,246			—			—			—			71,246
Intercompany payables		—			217,146			—			9,028			(226,174	)		—		Equity (deficit)
																			William Lyon Homes stockholders’ equity (deficit)		62,712			(144,795	)		207,507			22,148			(84,860	)		62,712
Total liabilities		—			648,487			252			15,217			(226,174	)		437,782		Noncontrolling interest		—			—			—			9,407			—			9,407
Redeemable convertible preferred stock		—			71,246			—			—			—			71,246
Equity (deficit)																			Total liabilities and equity (deficit)	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147
William Lyon Homes stockholders’ equity (deficit)		62,712			(144,795	)		207,507			22,148			(84,860	)		62,712
Noncontrolling interest		—			—			—			9,407			—			9,407
Total liabilities and equity (deficit)	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147		CONSOLIDATING BALANCE SHEET
																			(DEBTOR-IN-POSSESSION)
																			December 31, 2011 (Predecessor)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			(in thousands)
(Unaudited)
Three Months Ended September 30, 2013 (Successor)
(in thousands)																				Unconsolidated
																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	Unconsolidated																		ASSETS
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			Cash and cash equivalents	$	—		$	14,333		$	47		$	5,681		$	—		$	20,061
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			Restricted cash		—			852			—			—			—			852
Operating revenue																			Receivables		—			9,897			310			3,525			—			13,732
Sales	$	—		$	76,178		$	48,487		$	16,687		$	—		$	141,352		Real estate inventories
Construction services		—			9,478			—			—			—			9,478		Owned		—			278,939			—			119,595			—			398,534
Management fees		—			456			—			—			(456	)		—		Not owned		—			47,408			—			—			—			47,408
																			Deferred loan costs, net		—			8,810			—			—			—			8,810
		—			86,112			48,487			16,687			(456	)		150,830		Other assets, net		—			6,671			159			724			—			7,554
																			Investments in subsidiaries		(179,516	)		(85,714	)		—			—			265,230			—
Operating costs																			Intercompany receivables		—			—			203,517			12			(203,529	)		—
Cost of sales		—			(55,968	)		(40,519	)		(11,926	)		456			(107,957	)
Construction services		—			(8,135	)		—			—			—			(8,135	)	Total assets	$	(179,516	)	$	281,196		$	204,033		$	129,537		$	61,701		$	496,951
Sales and marketing		—			(4,108	)		(2,256	)		(315	)		—			(6,679	)
General and administrative		—			(9,473	)		(726	)		(1	)		—			(10,200	)	LIABILITIES AND (DEFICIT) EQUITY
Amortization of intangible assets		—			(191	)		—			—			—			(191	)	Liabilities not subject to compromise
Other		—			(695	)		—			—			—			(695	)	Accounts payable	$	—		$	1,436		$	—		$	—		$	—		$	1,436
																			Accrued expenses		—			2,082			—			—			—			2,082
		—			(78,570	)		(43,501	)		(12,242	)		456			(133,857	)	Liabilities from inventories not owned		—			47,408			—			—			—			47,408
Income from subsidiaries		12,716			5,804			—			—			(18,520	)		—		Notes payable		—			3,010			—			70,999			—			74,009
																			Senior Secured Term Loan		—			206,000			—			—			—			206,000
Operating income		12,716			13,346			4,986			4,445			(18,520	)		16,973		Intercompany payables		—			71,459			—			132,070			(203,529	)		—
Interest expense, net of amounts capitalized		—			(51	)		—			—			—			(51	)
Other income (expense), net		—			423			(9	)		(300	)		—			114				—			331,395			—			203,069			(203,529	)		330,935
																			Liabilities subject to compromise
Income before provision for income taxes		12,716			13,718			4,977			4,145			(18,520	)		17,036		Accounts payable		—			2,560			38			1,348			—			3,946
Provision for income taxes		—			(6,356	)		—			—			—			(6,356	)	Accrued expenses		—			47,051			218			1,188			—			48,457
																			7 5/8% Senior Notes		—			66,704			—			—			—			66,704
Net income		12,716			7,362			4,977			4,145			(18,520	)		10,680		10 3/4% Senior Notes		—			138,912			—			—			—			138,912
Less: Net income attributable to noncontrolling interest		—			—			—			(3,118	)		—			(3,118	)	7 1/2% Senior Notes		—			77,867			—			—			—			77,867
Net income attributable to William Lyon Homes		12,716			7,362			4,977			1,027			(18,520	)		7,562				—			333,094			256			2,536			—			335,886
Preferred stock dividends		—			—			—			—			—			—
																			Total liabilities		—			664,489			256			205,605			(203,529	)		666,821
Net income available to common stockholders	$	12,716		$	7,362		$	4,977		$	1,027		$	(18,520	)	$	7,562
																			(Deficit) equity
																			William Lyon Homes stockholders’ (deficit) equity		(179,516	)		(383,293	)		203,777			(85,714	)		265,230			(179,516	)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			Noncontrolling interest		—			—			—			9,646			—			9,646
(Unaudited)
Three Months Ended September 30, 2012 (Successor)																			Total liabilities and (deficit) equity	$	(179,516	)	$	281,196		$	204,033		$	129,537		$	61,701		$	496,951
(in thousands)
																			CONSOLIDATING STATEMENT OF OPERATIONS
	Unconsolidated																		Period from February 25, 2012 through
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			December 31, 2012 (Successor)
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			(in thousands)
Operating revenue
Sales	$	—		$	68,008		$	10,629		$	7,305		$	—		$	85,942
Construction services		—			7,045			—			—			—			7,045			Unconsolidated
Management fees		—			278			—			—			(278	)		—			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
		—			75,331			10,629			7,305			(278	)		92,987		Operating revenue
																			Sales	$	—		$	198,108		$	47,989		$	102,838		$	—		$	348,935
Operating costs																			Construction services		—			23,825			—			—			—			23,825
Cost of sales		—			(57,050	)		(8,912	)		(5,111	)		278			(70,795	)	Management fees		—			534			—			—			(534	)		—
Construction services		—			(6,410	)		—			—			—			(6,410	)
Sales and marketing		—			(3,219	)		(643	)		(310	)		—			(4,172	)			—			222,467			47,989			102,838			(534	)		372,760
General and administrative		—			(5,368	)		(70	)		(2	)		—			(5,440	)
Amortization of intangible assets					(1,640	)											(1,640	)	Operating costs
Other		—			(588	)		—			(357	)		—			(945	)	Cost of sales		—			(163,083	)		(41,516	)		(93,924	)		534			(297,989	)
																			Construction services		—			(21,416	)		—			—			—			(21,416	)
		—			(74,275	)		(9,625	)		(5,780	)		278			(89,402	)	Sales and marketing		—			(10,705	)		(2,617	)		(606	)		—			(13,928	)
(Loss) income from subsidiaries		(752	)		1,158			—			—			(406	)		—		General and administrative		—			(25,872	)		(221	)		(2	)		—			(26,095	)
																			Amortization of intangible assets		—			(5,757	)		—			—			—			(5,757	)
Operating (loss) income		(752	)		2,214			1,004			1,525			(406	)		3,585		Other		—			(3,027	)		(2	)		120			—			(2,909	)
Interest expense, net of amounts capitalized		—			(2,350	)		—			(141	)		—			(2,491	)
Other income (expense), net		—			160			(53	)		(12	)		—			95				—			(229,860	)		(44,356	)		(94,412	)		534			(368,094	)
(Loss) income before reorganization items and provision for income taxes		(752	)		24			951			1,372			(406	)		1,189		(Loss) income from subsidiaries		(8,859	)		11,681			—			—			(2,822	)		—
Reorganization items, net		—			(712	)		—			—			—			(712	)
																			Operating (loss) income		(8,859	)		4,288			3,633			8,426			(2,822	)		4,666
(Loss) income before provision for income taxes		(752	)		(688	)		951			1,372			(406	)		477		Loss on extinguishment of debt		—			(1,392	)		—			—			—			(1,392	)
Provision for income taxes		—			(11	)		—			—			—			(11	)	Interest expense, net of amounts capitalized		—			(9,227	)		—			100			—			(9,127	)
																			Other income (expense), net		—			618			(61	)		971			—			1,528
Net (loss) income		(752	)		(699	)		951			1,372			(406	)		466
Less: Net income attributable to noncontrolling interest		—						—			(1,218	)		—			(1,218	)	(Loss) income before reorganization items and provision for income taxes		(8,859	)		(5,713	)		3,572			9,497			(2,822	)		(4,325	)
																			Reorganization items, net		—			(3,073	)		1			547			—			(2,525	)
Net (loss) income attributable to William Lyon Homes		(752	)		(699	)		951			154			(406	)		(752	)
Preferred stock dividends		(755	)		—			—			—			—			(755	)	(Loss) income before provision for income taxes		(8,859	)		(8,786	)		3,573			10,044			(2,822	)		(6,850	)
																			Provision for income taxes		—			(11	)		—			—			—			(11	)
Net (loss) income available to common stockholders	$	(1,507	)	$	(699	)	$	951		$	154		$	(406	)	$	(1,507	)
																			Net (loss) income		(8,859	)		(8,797	)		3,573			10,044			(2,822	)		(6,861	)
																			Less: Net income attributable to noncontrolling interest		—			—			—			(1,998	)		—			(1,998	)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
(Unaudited)																			Net (loss) income attributable to William Lyon Homes		(8,859	)		(8,797	)		3,573			8,046			(2,822	)		(8,859	)
Nine Months Ended September 30, 2013 (Successor)																			Preferred stock dividends		(2,743	)		—			—			—			—			(2,743	)
(in thousands)
																			Net (loss) income available to common stockholders	$	(11,602	)	$	(8,797	)	$	3,573		$	8,046		$	(2,822	)	$	(11,602	)
	Unconsolidated
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			CONSOLIDATING STATEMENT OF OPERATIONS
Operating revenue																			Period from January 1, 2012 through
Sales	$	—		$	173,032		$	142,105		$	26,545		$	—		$	341,682		February 24, 2012 (Predecessor)
Construction services		—			21,439			—			—			—			21,439		(in thousands)
Management fees		—			(727	)		—			—			727			—
		—			193,744			142,105			26,545			727			363,121			Unconsolidated
																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Operating costs																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Cost of sales		—			(132,270	)		(119,051	)		(18,722	)		(727	)		(270,770	)	Operating revenue
Construction services		—			(17,472	)		—			—			—			(17,472	)	Home sales	$	—		$	10,024		$	4,316		$	2,347		$	—		$	16,687
Sales and marketing		—			(9,826	)		(6,867	)		(789	)		—			(17,482	)	Construction services		—			8,883			—			—			—			8,883
General and administrative		—			(26,162	)		(1,835	)		(19	)		—			(28,016	)	Management fees		—			110			—			—			(110	)		—
Amortization of intangible assets		—			(1,173	)		—			—			—			(1,173	)
Other		—			(1,744	)		(2	)		—			—			(1,746	)			—			19,017			4,316			2,347			(110	)		25,570
		—			(188,647	)		(127,755	)		(19,530	)		(727	)		(336,659	)	Operating costs
Income from subsidiaries		17,562			13,800			—			—			(31,362	)		—		Cost of sales — homes		—			(8,819	)		(3,820	)		(2,069	)		110			(14,598	)
																			Construction services		—			(8,223	)		—			—			—			(8,223	)
Operating income		17,562			18,897			14,350			7,015			(31,362	)		26,462		Sales and marketing		—			(1,496	)		(260	)		(188	)		—			(1,944	)
Interest expense, net of amounts capitalized		—			(2,476	)		(126	)		—			—			(2,602	)	General and administrative		—			(3,246	)		(56	)		—			—			(3,302	)
Other income (expense), net		—			1,184			(20	)		(907	)		—			257		Other		—			(16	)		—			(171	)		—			(187	)
Income before reorganization items and provision for income taxes		17,562			17,605			14,204			6,108			(31,362	)		24,117				—			(21,800	)		(4,136	)		(2,428	)		110			(28,254	)
Reorganization items, net		—			(464	)		—			—			—			(464	)
																			Income from subsidiaries		228,383			11,536			—			—			(239,919	)		—
Income before provision for income taxes		17,562			17,141			14,204			6,108			(31,362	)		23,653
Provision for income taxes		—			(6,366	)		—			—			—			(6,366	)	Operating income (loss)		228,383			8,753			180			(81	)		(239,919	)		(2,684	)
																			Interest expense, net of amounts capitalized		—			(2,407	)		—			(100	)		—			(2,507	)
Net income		17,562			10,775			14,204			6,108			(31,362	)		17,287		Other income (expense), net		—			266			(25	)		(11	)		—			230
Less: Net income attributable to noncontrolling interest		—			—			—			(4,879	)		—			(4,879	)
																			Income (loss) before reorganization items and provision for income taxes		228,383			6,612			155			(192	)		(239,919	)		(4,961	)
Net income attributable to William Lyon Homes		17,562			10,775			14,204			1,229			(31,362	)		12,408		Reorganization items		—			221,796			(1	)		11,663			—			233,458
Preferred stock dividends		(1,528	)		—			—			—			—			(1,528	)
																			Income before provision for income taxes		228,383			228,408			154			11,471			(239,919	)		228,497
Net income available to common stockholders	$	16,034		$	10,775		$	14,204		$	1,229		$	(31,362	)	$	10,880		Provision for income taxes		—			—			—			—			—			—
																			Net income		228,383			228,408			154			11,471			(239,919	)		228,497
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			Less: Net income attributable to noncontrolling interest		—			—			—			(114	)		—			(114	)
(Unaudited)
Period from February 25, 2012 through																			Net income attributable to William Lyon Homes	$	228,383		$	228,408		$	154		$	11,357		$	(239,919	)	$	228,383
September 30, 2012 (Successor)
(in thousands)
																			CONSOLIDATING STATEMENT OF OPERATIONS
																			(DEBTOR-IN-POSSESSION)
	Unconsolidated																		Year Ended December 31, 2011 (Predecessor)
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			(in thousands)
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Operating revenue
Sales	$	—		$	111,159		$	32,105		$	102,838		$	—		$	246,102			Unconsolidated
Construction services		—			16,473			—			—			—			16,473			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Management fees		—			534			—			—			(534	)		—			Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
																			Operating revenue
		—			128,166			32,105			102,838			(534	)		262,575		Home sales	$	—		$	176,992		$	19,954		$	10,109		$	—		$	207,055
																			Construction services		—			19,768			—			—			—			19,768
Operating costs																			Management fees		—			468			—			—			(468	)		—
Cost of sales		—			(94,003	)		(27,737	)		(93,924	)		534			(215,130	)
Construction services		—			(15,061	)		—			—			—			(15,061	)			—			197,228			19,954			10,109			(468	)		226,823
Sales and marketing		—			(6,493	)		(1,679	)		(663	)		—			(8,835	)
General and administrative		—			(13,733	)		(186	)		(6	)		—			(13,925	)	Operating costs
Amortization of intangible assets		—			(5,034	)		—			—			—			(5,034	)	Cost of sales		—			(162,148	)		(18,225	)		(8,818	)		468			(188,723	)
Other		—			(1,713	)		(2	)		(687	)		—			(2,402	)	Impairment loss on real estate assets		—			(70,742	)		—			(57,572	)		—			(128,314	)
																			Construction services		—			(18,164	)		—			—			—			(18,164	)
		—			(136,037	)		(29,604	)		(95,280	)		534			(260,387	)	Sales and marketing		—			(14,528	)		(1,318	)		(1,002	)		—			(16,848	)
(Loss) income from subsidiaries		(7,611	)		8,620			—			—			(1,009	)		—		General and administrative		—			(22,070	)		(340	)		(1	)		—			(22,411	)
																			Other		—			(2,979	)		—			(1,004	)		—			(3,983	)
Operating (loss) income		(7,611	)		749			2,501			7,558			(1,009	)		2,188
Interest expense, net of amounts capitalized		—			(6,970	)		—			(357	)		—			(7,327	)			—			(290,631	)		(19,883	)		(68,397	)		468			(378,443	)
Other income, net		—			562			(45	)		954			—			1,471
																			Equity in income of unconsolidated joint ventures		—			3,605			—			—			—			3,605
(Loss) income before reorganization items and provision for income taxes		(7,611	)		(5,659	)		2,456			8,155			(1,009	)		(3,668	)	Loss from subsidiaries		(193,330	)		(59,588	)		—			—			252,918			—
Reorganization items, net		—			(1,895	)		1			—			—			(1,894	)
																			Operating (loss) income		(193,330	)		(149,386	)		71			(58,288	)		252,918			(148,015	)
(Loss) income before provision for income taxes		(7,611	)		(7,554	)		2,457			8,155			(1,009	)		(5,562	)	Interest expense, net of amounts capitalized		—			(23,639	)		—			(890	)		—			(24,529	)
Provision for income taxes		—			(11	)		—			—			—			(11	)	Other income (expense), net		—			1,018			(131	)		(49	)		—			838
Net (loss) income		(7,611	)		(7,565	)		2,457			8,155			(1,009	)		(5,573	)	Loss before reorganization items and provision for income taxes		(193,330	)		(172,007	)		(60	)		(59,227	)		252,918			(171,706	)
Less: Net income attributable to noncontrolling interest		—			—			—			(2,038	)		—			(2,038	)	Reorganization items		—			(21,182	)		—			—			—			(21,182	)
Net (loss) income attributable to William Lyon Homes		(7,611	)		(7,565	)		2,457			6,117			(1,009	)		(7,611	)	Loss before provision for income taxes		(193,330	)		(193,189	)		(60	)		(59,227	)		252,918			(192,888	)
Preferred stock dividends		(1,798	)		—			—			—			—			(1,798	)	Provision for income taxes		—			(10	)		—			—			—			(10	)
Net (loss) income available to common stockholders	$	(9,409	)	$	(7,565	)	$	2,457		$	6,117		$	(1,009	)	$	(9,409	)	Net loss		(193,330	)		(193,199	)		(60	)		(59,227	)		252,918			(192,898	)
																			Less: Net income attributable to noncontrolling interest		—			—			—			(432	)		—			(432	)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			Net loss attributable to William Lyon Homes	$	(193,330	)	$	(193,199	)	$	(60	)	$	(59,659	)	$	252,918		$	(193,330	)
(Unaudited)
Period from January 1, 2012 through
February 24, 2012 (Predecessor)																			CONSOLIDATING STATEMENT OF OPERATIONS
(in thousands)																			Year Ended December 31, 2010 (Predecessor)
																			(in thousands)
	Unconsolidated
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated				Unconsolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Operating revenue																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Home sales	$	—		$	10,024		$	4,316		$	2,347		$	—		$	16,687		Operating revenue
Construction services		—			8,883			—			—			—			8,883		Sales	$	—		$	263,864		$	16,595		$	3,610		$	—		$	284,069
Management fees		—			110			—			—			(110	)		—		Construction services		—			10,629			—			—			—			10,629
																			Management fees		—			165			—			—			(165	)		—
		—			19,017			4,316			2,347			(110	)		25,570
																					—			274,658			16,595			3,610			(165	)		294,698
Operating costs
Cost of sales — homes		—			(8,819	)		(3,820	)		(2,069	)		110			(14,598	)	Operating costs																	—
Construction services		—			(8,223	)		—			—			—			(8,223	)	Cost of sales		—			(228,542	)		(16,167	)		(1,633	)		165			(246,177	)
Sales and marketing		—			(1,496	)		(260	)		(188	)		—			(1,944	)	Impairment loss on real estate assets		—			(111,860	)		—			—			—			(111,860	)
General and administrative		—			(3,246	)		(56	)		—			—			(3,302	)	Construction services		—			(7,805	)		—			—			—			(7,805	)
Other		—			(16	)		—			(171	)		—			(187	)	Sales and marketing		—			(17,953	)		(1,208	)		(585	)		—			(19,746	)
																			General and administrative		—			(24,795	)		(313	)		(21	)		—			(25,129	)
		—			(21,800	)		(4,136	)		(2,428	)		110			(28,254	)	Other		—			(2,740	)		—			—			—			(2,740	)
Income from subsidiaries		228,383			11,536			—			—			(239,919	)		—
																					—			(393,695	)		(17,688	)		(2,239	)		165			(413,457	)
Operating income (loss)		228,383			8,753			180			(81	)		(239,919	)		(2,684	)
Interest expense, net of amounts capitalized		—			(2,407	)		—			(100	)		—			(2,507	)	Equity in income of unconsolidated joint ventures		—			916			—			—			—			916
Other income (expense), net		—			266			(25	)		(11	)		—			230		(Loss) income from subsidiaries		(136,786	)		(1,053	)		12			—			137,827			—
Income (loss) before reorganization items and provision for income taxes		228,383			6,612			155			(192	)		(239,919	)		(4,961	)	Operating (loss) income		(136,786	)		(119,174	)		(1,081	)		1,371			137,827			(117,843	)
Reorganization items, net		—			221,796			(1	)		11,663			—			233,458		Gain on extinguishment of debt		—			5,572			—			—			—			5,572
																			Interest expense, net of amounts capitalized		—			(23,653	)		—			—			—			(23,653	)
Net income		228,383			228,408			154			11,471			(239,919	)		228,497		Other income (expense), net		—			280			(235	)		12			—			57
Less: Net income attributable to noncontrolling interest		—			—			—			(114	)		—			(114	)
																			(Loss) income before benefit from income taxes		(136,786	)		(136,975	)		(1,316	)		1,383			137,827			(135,867	)
Net income attributable to William Lyon Homes	$	228,383		$	228,408		$	154		$	11,357		$	(239,919	)	$	228,383		Benefit from income taxes		—			412			—			—			—			412
																			Net (loss) income		(136,786	)		(136,563	)		(1,316	)		1,383			137,827			(135,455	)
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																			Less: Net income attributable to noncontrolling interest		—			—			—			(1,331	)		—			(1,331	)
(Unaudited)
Nine Months Ended September 30, 2013 (Successor)																			Net (loss) income attributable to William Lyon Homes	$	(136,786	)	$	(136,563	)	$	(1,316	)	$	52		$	137,827		$	(136,786	)
(in thousands)
																			CONSOLIDATING STATEMENT OF CASH FLOWS
	Unconsolidated																		Period from February 25, 2012 through
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			December 31, 2012 (Successor)
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			(in thousands)
Operating activities
Net cash (used in) provided by operating activities	$	—		$	(142,959	)	$	12,221		$	(34,181	)	$	—		$	(164,919	)
																				Unconsolidated
Investing activities																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Purchases of property and equipment		—			(3,299	)		(57	)		(3	)		—			(3,359	)		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Investments in subsidiaries		—			4,804			—			—			(4,804	)		—		Operating activities
																			Net cash (used in) provided by operating activities	$	—		$	(72,014	)	$	3,579		$	118,428		$	—		$	49,993
Net cash provided by(used in) investing activities		—			1,505			(57	)		(3	)		(4,804	)		(3,359	)
																			Investing activities
Financing activities																			Cash paid for acquisitions, net		—			(33,201	)		—			—			—			(33,201	)
Proceeds from borrowings on notes payable		—			16,790			1,762			32,892			—			51,444		Purchases of property and equipment		—			(271	)		(20	)		(21	)		—			(312	)
Principal payments on notes payable		—			(26,360	)		—			(19,099	)		—			(45,459	)	Investments in subsidiaries		—			(84,828	)		—			—			84,828			—
Payment of deferred loan costs		—			(1,792	)		—			—			—			(1,792	)
Proceeds from issuance of common stock		—			179,438			—			—			—			179,438		Net cash used in investing activities		—			(118,300	)		(20	)		(21	)		84,828			(33,513	)
Offering costs related to issuance of common stock		—			(15,655	)		—			—			—			(15,655	)
Payment of preferred stock dividends		—			(2,550	)		—			—			—			(2,550	)	Financing activities
Noncontrolling interest contributions		—			—			—			35,399			—			35,399		Proceeds from borrowings on notes payable		—			7,809			—			5,439			—			13,248
Noncontrolling interest distributions		—			—			—			(21,700	)		—			(21,700	)	Proceeds from issurance of 8 1/2% Senior Notes		—			325,000			—			—			—			325,000
Advances to affiliates		—			—			(776	)		7,768			(6,992	)		—		Principal payments on notes payable		—			(3,994	)		—			(69,682	)		—			(73,676	)
Intercompany receivables/payables		—			183			(12,902	)		923			11,796			—		Principal payments on Senior Secured Term Loan		—			(235,000	)		—			—			—			(235,000	)
																			Principal payments on Senior Subordinated Secured Notes		—			(75,916	)		—			—			—			(75,916	)
Net cash provided by (used in) financing activities		—			150,054			(11,916	)		36,183			4,804			179,125		Proceeds from issuance of convertible preferred stock		—			14,000			—			—			—			14,000
																			Proceeds from issuance of common stock		—			16,000			—			—			—			16,000
Net increase in cash and cash equivalents		—			8,600			248			1,999			—			10,847		Payment of deferred loan costs		—			(7,181	)		—			—			—			(7,181	)
Cash and cash equivalents at beginning of period		—			69,376			65			1,634			—			71,075		Payment of preferred stock dividends		—			(1,721	)		—			—			—			(1,721	)
																			Noncontrolling interest contributions		—			—			—			15,313			—			15,313
Cash and cash equivalents at end of period	$	—		$	77,976		$	313		$	3,633		$	—		$	81,922		Noncontrolling interest distributions		—			—			—			(16,004	)		—			(16,004	)
																			Advances to affiliates		—			—			3			78,817			(78,820	)		—
																			Intercompany receivables/payables		—			144,535			(3,549	)		(134,978	)		(6,008	)		—
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
(Unaudited)																			Net cash provided (used in) by financing activities		—			183,532			(3,546	)		(121,095	)		(84,828	)		(25,937	)
Period from February 25, 2012 through
September 30, 2012 (Successor)																			Net (decrease) increase in cash and cash equivalents		—			(6,782	)		13			(2,688	)		—			(9,457	)
(in thousands)																			Cash and cash equivalents at beginning of period		—			76,158			52			4,322			—			80,532
																			Cash and cash equivalents at end of period	$	—		$	69,376		$	65		$	1,634		$	—		$	71,075
	Unconsolidated
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			CONSOLIDATING STATEMENT OF CASH FLOWS
Operating activities																			Period from January 1, 2012 through
Net cash (used in) provided by operating activities	$	—		$	(14,494	)	$	2,546		$	67,937		$	—		$	55,989		February 24, 2012 (Predecessor)
																			(in thousands)
Investing activities
Purchases of property and equipment		—			(24	)		(13	)		(16	)		—			(53	)
Investments in subsidiaries		—			(3,837	)		—			—			3,837			—			Unconsolidated
																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Net cash (used in) provided by investing activities		—			(3,861	)		(13	)		(16	)		3,837			(53	)		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
																			Operating activities
Financing activities																			Net cash (used in) provided by operating activities	$	—		$	(13,638	)	$	181		$	(3,864	)	$	—		$	(17,321	)
Payment of preferred stock dividends		—			(1,114	)		—			—			—			(1,114	)
Principal payments on notes payable		—			(4,157	)		—			(58,400	)		—			(62,557	)	Investing activities
Noncontrolling interest contributions		—			—			—			17,021			—			17,021		Purchases of property and equipment		—			(419	)		(3	)		422			—			—
Noncontrolling interest distributions		—			—			—			(15,373	)		—			(15,373	)	Investments in subsidiaries		—			183			—			—			(183	)		—
Advances to affiliates		—			—			1			(3,306	)		3,305			—
Intercompany receivables/payables		—			19,087			(2,530	)		(9,415	)		(7,142	)		—		Net cash (used in) provided by investing activities		—			(236	)		(3	)		422			(183	)		—
Net cash provided by (used in) financing activities		—			13,816			(2,529	)		(69,473	)		(3,837	)		(62,023	)	Financing activities
																			Principal payments on notes payable		—			(116	)		—			(500	)		—			(616	)
Net (decrease) increase in cash and cash equivalents		—			(4,539	)		4			(1,552	)		—			(6,087	)	Proceeds from reorganization		—			30,971			—			—			—			30,971
Cash and cash equivalents at beginning of period		—			76,158			52			4,322			—			80,532		Proceeds from issuance of convertible preferred stock		—			50,000			—			—			—			50,000
																			Proceeds from debtor in possession financing		—			5,000			—			—			—			5,000
Cash and cash equivalents at end of period	$	—		$	71,619		$	56		$	2,770		$	—		$	74,445		Principal payment of debtor in possession financing		—			(5,000	)		—			—			—			(5,000	)
																			Payment of deferred loan costs		—			(2,491	)		—			—			—			(2,491	)
																			Noncontrolling interest contributions		—			—			—			1,825			—			1,825
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																			Noncontrolling interest distributions		—			—			—			(1,897	)		—			(1,897	)
(Unaudited)																			Advances to affiliates		—			—			—			(4	)		4			—
Period from January 1, 2012 through																			Intercompany receivables/payables		—			(2,665	)		(173	)		2,659			179			—
February 24, 2012 (Predecessor)
(in thousands)																			Net cash provided by (used in) financing activities		—			75,699			(173	)		2,083			183			77,792
																			Net increase (decrease) in cash and cash equivalents		—			61,825			5			(1,359	)		—			60,471
	Unconsolidated																		Cash and cash equivalents at beginning of period		—			14,333			47			5,681			—			20,061
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			Cash and cash equivalents at end of period	$	—		$	76,158		$	52		$	4,322		$	—		$	80,532
Operating activities
Net cash (used in) provided by operating activities	$	—		$	(13,638	)	$	181		$	(3,864	)	$	—		$	(17,321	)
																			CONSOLIDATING STATEMENT OF CASH FLOWS
Investing activities																			(DEBTOR-IN-POSSESSION)
Purchases of property and equipment		—			(419	)		(3	)		422			—			—		Year Ended December, 2011 (Predecessor)
Investments in subsidiaries		—			183			—			—			(183	)		—		(in thousands)
Net cash (used in) provided by investing activities		—			(236	)		(3	)		422			(183	)		—
																				Unconsolidated
Financing activities																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Principal payments on notes payable		—			(116	)		—			(500	)		—			(616	)		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Proceeds from reorganization		—			30,971			—			—			—			30,971		Operating activities
Proceeds from issuance of convertible preferred stock		—			50,000			—			—			—			50,000		Net cash provided by (used in) operating activities	$	—		$	127,757		$	87		$	(166,495	)	$	—		$	(38,651	)
Proceeds from debtor in possession financing		—			5,000			—			—			—			5,000
Principal payment of debtor in possession financing		—			(5,000	)		—			—			—			(5,000	)	Investing activities
Payment of deferred loan costs		—			(2,491	)		—			—			—			(2,491	)	Distributions from unconsolidated joint ventures		—			1,435			—			—			—			1,435
Noncontrolling interest contributions		—			—			—			1,825			—			1,825		Purchases of property and equipment		—			725			(131	)		(722	)		—			(128	)
Noncontrolling interest distributions		—			—			—			(1,897	)		—			(1,897	)	Investments in subsidiaries		—			29,412			—			—			(29,412	)		—
Advances to affiliates		—			—			—			(4	)		4			—
Intercompany receivables/payables		—			(2,665	)		(173	)		2,659			179			—		Net cash provided by (used in) investing activities		—			31,572			(131	)		(722	)		(29,412	)		1,307
Net cash provided by (used in) financing activities		—			75,699			(173	)		2,083			183			77,792		Financing activities
																			Principal payments on notes payable		—			(82,531	)		—			70,999			—			(11,532	)
Net increase (decrease) in cash and cash equivalents		—			61,825			5			(1,359	)		—			60,471		Noncontrolling interest contributions		—			—			—			6,605			—			6,605
Cash and cash equivalents at beginning of period		—			14,333			47			5,681			—			20,061		Noncontrolling interest distributions		—			—			—			(8,954	)		—			(8,954	)
																			Advances to affiliates		—			—			(3	)		(29,341	)		29,344			—
Cash and cash equivalents at end of period	$	—		$	76,158		$	52		$	4,322		$	—		$	80,532		Intercompany receivables/payables		—			(131,964	)		(37	)		131,933			68			—
																			Net cash (used in) provided by financing activities		—			(214,495	)		(40	)		171,242			29,412			(13,881	)
																			Net (decrease) increase in cash and cash equivalents		—			(55,166	)		(84	)		4,025			—			(51,225	)
																			Cash and cash equivalents at beginning of period		—			69,499			131			1,656			—			71,286
																			Cash and cash equivalents at end of period	$	—		$	14,333		$	47		$	5,681		$	—		$	20,061
																			CONSOLIDATING STATEMENT OF CASH FLOWS
																			Year Ended December 30, 2010 (Predecessor)
																			(in thousands)
																				Unconsolidated
																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
																			Operating activities
																			Net cash provided by (used in) operating activities	$	—		$	27,863		$	(1,245	)	$	(2,499	)	$	—		$	24,119
																			Investing activities
																			Investment in and advances to unconsolidated joint ventures		—			(194	)		—			—			—			(194	)
																			Distributions from unconsolidated joint venture		—			4,183			—			—			—			4,183
																			Purchases of property and equipment		—			101			(165	)		—			—			(64	)
																			Investments in subsidiaries		—			(361	)		12			—			349			—
																			Net cash provided by (used in) investing activities		—			3,729			(153	)		—			349			3,925
																			Financing activities
																			Proceeds from borrowings on notes payable		—			7,087			—			—			—			7,087
																			Principal payments on notes payable		—			(52,797	)		—			—			—			(52,797	)
																			Net cash paid for repurchase of Senior Notes		—			(31,268	)		—			—			—			(31,268	)
																			Noncontrolling interest contributions		—			—			—			6,546			—			6,546
																			Noncontrolling interest distributions		—			—			—			(3,913	)		—			(3,913	)
																			Advances to affiliates		—			—			(19	)		(744	)		763			—
																			Intercompany receivables/payables		—			(362	)		1,437			37			(1,112	)		—
																			Net cash (used in) provided by financing activities		—			(77,340	)		1,418			1,926			(349	)		(74,345	)
																			Net (decrease) increase in cash and cash equivalents		—			(45,748	)		20			(573	)		—			(46,301	)
																			Cash and cash equivalents at beginning of period		—			115,247			111			2,229			—			117,587
																			Cash and cash equivalents at end of period	$	—		$	69,499		$	131		$	1,656		$	—		$	71,286

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended											12 Months Ended
	Sep. 30, 2013											Dec. 31, 2012
Fair Value of Financial Instruments	'											'
	Note 6—Fair Value of Financial Instruments											Note 11—Fair Value of Financial Instruments
	In accordance with FASB ASC Topic 820, Fair Value Measurements and Disclosure (“ASC 820”), the Company is required to disclose the estimated fair value of financial instruments. As of September 30, 2013 and December 31, 2012, the Company used the following assumptions to estimate the fair value of each type of financial instrument for which it is practicable to estimate:											In accordance with FASB ASC Topic 820 Fair Value Measurements and Disclosure, (“ASC 820”) the Company is required to disclose the estimated fair value of financial instruments. As of December 31, 2012 and 2011, the Company used the following assumptions to estimate the fair value of each type of financial instrument for which it is practicable to estimate:
		•		8  1/2% Senior Notes—The 8  1/2% Senior Notes are traded over the counter and their fair values were based upon quotes from industry sources.									•		Notes Payable—The carrying amount is a reasonable estimate of fair value of the notes payable because the loans were entered into during the final quarter of the year and/or the outstanding balance at year end is expected to be repaid within one year;
		•		Notes Payable—The carrying amount is a reasonable estimate of fair value of the notes payable because the loans were either entered into during the current or prior quarter, market rates are unchanged and/or the outstanding balance at quarter end is expected to be repaid within one year;									•		8  1/2 Senior Notes—The 8  1/2 Senior Notes are traded over the counter and their fair values were based upon quotes from industry sources;
	The following table excludes cash and cash equivalents, restricted cash, receivables and accounts payable, which had fair values approximating their carrying amounts due to the short maturities and liquidity of these instruments. The estimated fair values of financial instruments are as follows (in thousands):
													•		Senior Secured Term Loan—The face amount of the term loan as of December 31, 2011 is $206.0 million. However, the renegotiated principal amount of the loan in accordance with the joint plan of reorganization is $235.0 million. Since the joint plan of reorganization was filed on December 19, 2011, the renegotiated amount of the term loan is a reasonable fair value as of December 31, 2011; and
			Successor										•		Old Senior Notes Payable—The Senior Notes were traded over the counter and their fair values were based upon quotes from industry sources, as of December 31, 2011.
			September 30, 2013					December 31, 2012				The following table excludes cash and cash equivalents, restricted cash, receivables and accounts payable, which had fair values approximating their carrying amounts due to the short maturities and liquidity of these instruments. The estimated fair values of financial instruments are as follows (in thousands):
			Carrying			Fair		Carrying		Fair
			Amount			Value		Amount		Value
	Financial liabilities:													Successor								Predecessor
	8   1/2% Senior Notes due 2020		$	325,000		$	342,875	$	325,000	$	338,000			December 31, 2012								December 31, 2011
	Notes payable		$	35,471		$	35,471	$	13,248	$	13,248			Carrying			Fair					Carrying		Fair
	ASC 820 establishes a framework for measuring fair value, expands disclosures regarding fair value measurements and defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 requires the Company to maximize the use of observable market inputs, minimize the use of unobservable market inputs and disclose in the form of an outlined hierarchy the details of such fair value measurements. The Company used Level 3 to measure the fair value of its Notes Payable, and Level 2 to measure the fair value of its 81 /2 % Senior Notes. ASC 820 specifies a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. The three levels of the hierarchy are as follows:													Amount			Value					Amount		Value
												Financial liabilities:
		•		Level 1—quoted prices for identical assets or liabilities in active markets;								Notes payable		$	13,248		$	13,248				$	74,009	$	74,009
												8 1/2% Senior Notes due 2020		$	325,000		$	338,000				$	—	$	—
		•		Level 2—quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and								Senior Secured Term Loan due 2015		$	—		$	—				$	206,000	$	235,000
												7 5/8% Senior Notes due 2012		$	—		$	—				$	66,704	$	20,469
		•		Level 3—valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.								10 3/4% Senior Notes due 2013		$	—		$	—				$	138,912	$	40,614
	The following table represents a reconciliation of the beginning and ending balance for the Company’s Level 3 fair value measurements:											7 1/2% Senior Notes due 2014		$	—		$	—				$	77,867	$	21,742
												ASC 820 establishes a framework for measuring fair value, expands disclosures regarding fair value measurements and defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 requires the Company to maximize the use of observable market inputs, minimize the use of unobservable market inputs and disclose in the form of an outlined hierarchy the details of such fair value measurements. The Company used Level 3 to measure the fair value of its Notes Payable, and Senior Secured Term Loan, and Level 2 to measure the fair value of its 81/2 Senior Notes and Old Senior Notes Payable. ASC 820 specifies a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. The three levels of the hierarchy are as follows:
			Notes										•		Level 1—quoted prices for identical assets or liabilities in active markets;
			Payable
			(in thousands)										•		Level 2—quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and
	Fair value at December 31, 2012		$	13,248
	Repayments of principal (1)			(45,459	)								•		Level 3—valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
	Borrowings of principal (2)			67,682								The following table represents a reconciliation of the beginning and ending balance for the Company’s Level 3 fair value measurements:
	Increase in value during the period			—
	Fair value at September 30, 2013		$	35,471													Senior
														Notes			Secured
														Payable			Term Loan
	-1	Represents the actual amount of principal repaid												(in thousands)
	-2	Represents the actual amount of principal borrowed										Fair Value at December 31, 2011 (Predecessor)		$	74,009		$	235,000
												Change in balance related to plan of reorganization (1)			—			—
												Repayments of principal (2)			(74,009	)		(235,000	)
												Borrowings of principal (3)			13,248			—
												Increase in value during the period			—			—
												Fair Value at December 31, 2012 (Successor)		$	13,248		$	—
												-1	Change is representative of payoff of the loan for the value reported at December 31, 2011, and not the face amount of the notes that were eliminated in accordance with the joint plan of reorganization.
												-2	Represents the actual amount of principal repaid
												-3	Represents the actual amount of principal borrowed
												Non-financial Instruments
												The Company adopted FASB ASC Topic 820 in 2008, however, disclosure of certain non-financial portions of the statement were deferred until the 2009 reporting period. These non-financial homebuilding assets are those assets for which the Company recorded valuation adjustments during 2011 on a nonrecurring basis. See Note 7, “Real Estate Inventories” for further discussion of the valuation of real estate inventories.
												The following table summarizes the fair-value measurements of its non-financial assets for the year ended December 31, 2011:
														Fair Value			Fair Value at			Impairment
														Hierarchy			Measurement			Charges
																	Date(1)			for the Year Ended
																				December 31,
																				2011(1)
														(in thousands)
												Land under development and homes completed and under construction(2)			Level 3		$	94,751		$	34,835
												Inventory held for future development(3)			Level 3		$	74,146		$	93,479
												-1	Amounts represent the aggregate fair values for communities where the Company recognized noncash inventory impairment charges during the year ended December 31, 2011.
												-2	In accordance with FASB ASC 360-10-35, inventory under this caption with a carrying value of $129.6 million was written down to its fair value of $94.8 million, resulting in total impairments of $34.8 million for the year ended December 31, 2011.
												-3	In accordance with FASB ASC 360-10-35, inventory under this caption with a carrying value of $167.6 million was written down to its fair value of $74.1 million, resulting in total impairments of $93.5 million for the year ended December 31, 2011.
												Fair values determined to be Level 3 include the use of internal assumptions, estimates and financial forecasts. Valuations of these items are therefore sensitive to the assumptions used. Fair values represent the Company’s best estimates as of the measurement date, based on conditions existing and information available at the date of issuance of the consolidated financial statements. Subsequent changes in conditions or information available may change assumptions and estimates, as outlined in more detail within “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” Fair values determined using Level 3 inputs, were primarily based on the estimated future cash flows discounted for inherent risk associated with each asset. These discounted cash flows are impacted by: the risk-free rate of return; expected risk premium based on estimated land development; construction and delivery timelines; market risk from potential future price erosion; cost uncertainty due to development or construction cost increases; and other risks specific to the asset or conditions in the market in which the asset is located at the time the assessment is made.
												In addition, for the year ended December 31, 2011, the Company engaged a third-party valuation advisor to assess values of market comparables on land held for future development. These factors are specific to each community and may vary among communities.

Related_Party_Transactions

Related Party Transactions	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Related Party Transactions	'	'
	Note 7—Related Party Transactions	Note 12—Related Party Transactions
	For the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through September 30, 2012, the Company incurred reimbursable on-site labor costs of $0, $77,000, $1,000, $27,000 and $254,000, respectively, for providing customer service to real estate projects developed by entities controlled by General William Lyon and William H. Lyon. At September 30, 2013 and December 31, 2012, $200 and $7,000, respectively, was due to the Company for reimbursable on-site labor costs.	For the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through December 31, 2012, the Company incurred reimbursable on-site labor costs of $27,000 and $276,000, respectively, and for the year ended December 31, 2011 and 2010, the Company incurred reimbursable on-site labor costs of $318,000 and $217,000, respectively, for providing customer service to real estate projects developed by entities controlled by William Lyon and William H. Lyon. At December 31, 2012 and December 31, 2011, $7,000 and $24,000, respectively, was due to the Company for reimbursable on-site labor costs, all of which was paid.
	Effective April 1, 2011, upon approval by the Company’s board of directors at that time, the Company and an entity controlled by General William Lyon and William H. Lyon entered into a Human Resources and Payroll Services contract to provide that the affiliate will pay the Company a base monthly fee of $21,335 and a variable monthly fee equal to $23 multiplied by the number of active employees employed by such entity (which will initially result in a variable monthly fee of approximately $8,000). The amended contract also provides that the Company will be reimbursed by such affiliate for a pro rata share of any bonuses paid to the Company’s Human Resources staff (other than any bonus paid to the Vice President of Human Resources). The Company believes that the compensation being paid to it for the services provided to the affiliate is at a market rate of compensation, and that as a result of the fees that are paid to the Company under this contract, the overall cost to the Company of its Human Resources department will be reduced. The Company earned fees of $59,000, $52,000 and $179,000, during the three months ended September 30, 2012, the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through September 30, 2012, respectively, related to this agreement. This contract expired on August 31, 2012 and was not renewed, therefore there were no fees in 2013. Any future services provided to the affiliate will be on an as needed basis and will be paid for based on an hourly rate.	Effective April 1, 2011 upon approval by the Company’s board of directors at that time, the Company and an entity controlled by General William Lyon and William H. Lyon entered into a Human Resources and Payroll Services contract to provide that the affiliate will pay the Company a base monthly fee of $21,335 and a variable monthly fee equal to $23 multiplied by the number of active employees employed by such entity (which will initially result in a variable monthly fee of approximately $8,000). The amended contract also provides that the Company will be reimbursed by such affiliate for a pro rata share of any bonuses paid to the Company’s Human Resources staff (other than any bonus paid to the Vice President of Human Resources). The Company believes that the compensation being paid to it for the services provided to the affiliate is at a market rate of compensation, and that as a result of the fees that are paid to the Company under this contract, the overall cost to the Company of its Human Resources department will be reduced. The Company earned fees of $52,000 and $180,000, during the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through December 31, 2012, respectively, and fees of $362,000 and $426,000 during the year ended December 31, 2011 and 2010, respectively, related to this agreement. This contract expired on August 31, 2012 and was not renewed. Any future services provided to the affiliate will be on an as needed basis and will be paid for based on an hourly rate.
	On September 3, 2009, Presley CMR, Inc., a California corporation (“Presley CMR”) and a wholly owned subsidiary of California Lyon, entered into an Aircraft Purchase and Sale Agreement (“PSA”) with an affiliate of General William Lyon to sell an aircraft (the “Aircraft”). The PSA provided for an aggregate purchase price for the Aircraft of $8.3 million, (which value was the appraised fair market value of the Aircraft), which consisted of: (i) cash in the amount of $2.1 million to be paid at closing and (ii) a promissory note from the affiliate in the amount of $6.2 million. The note is secured by the Aircraft. As part of the Company’s fresh start accounting, the note was adjusted to its fair value of $5.2 million. The discount on the fresh start adjustment is amortized over the remaining life of the note. The note requires semiannual interest payments to California Lyon of approximately $132,000. The note is due in September 2016.	On September 3, 2009, Presley CMR, Inc., a California corporation (“Presley CMR”) and wholly owned subsidiary of California Lyon, entered into an Aircraft Purchase and Sale Agreement (“PSA”) with an affiliate of General William Lyon to sell an aircraft. The PSA provided for an aggregate purchase price for the Aircraft of $8.3 million, (which value was the appraised fair market value of the Aircraft), which consisted of: (i) cash in the amount of $2.1 million to be paid at closing and (ii) a promissory note from the affiliate in the amount of $6.2 million. The note is secured by the Aircraft. As part of the Company’s fresh start accounting, the note was adjusted to its fair value of $5.2 million. The discount on the fresh start adjustment is amortized over the remaining life of the note. The note requires semiannual interest payments to California Lyon of approximately $132,000. The note is due in September 2016.
	For the three months ended September 30, 2012, the nine months ended September 30, 2013, the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through September 30, 2012, the Company incurred charges of $197,000, $197,000, $118,000 and $472,000, respectively, related to rent on its corporate office, from a trust of which William H. Lyon is the sole beneficiary. The lease expired in March 2013 and the Company relocated its corporate office upon expiration of the lease. The Company has entered into a lease for the new location with an unrelated third party.	For the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through December 31, 2012, the Company incurred charges of $118,000 and $668,000, respectively, and for the year ended December 31, 2011 and 2010, the Company incurred charges of $786,000 and $786,000, respectively, related to rent on its corporate office, from a trust of which William H. Lyon is the sole beneficiary. The current lease expires in March 2013 and the Company has decided to relocate its corporate office upon expiration of the lease. The Company has entered into a lease for the new location with an unrelated third party.

Income_Taxes

Income Taxes	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Income Taxes	'	'
	Note 8—Income Taxes	Note 13—Income Taxes
	Since inception, the Company has operated solely within the United States.	On December 19, 2011, the Parent and certain of its subsidiaries filed voluntary petitions under Chapter 11 of Title 11 of the United States Code in the U.S. Bankruptcy Court for the District of Delaware. On February 25, 2012, the group of companies emerged from the Chapter 11 bankruptcy proceedings.
	On December 19, 2011, the Parent and certain of its subsidiaries filed voluntary petitions under Chapter 11 of Title 11 of the United States Code in the U.S. Bankruptcy Court for the District of Delaware. On February 25, 2012, the group of companies emerged from the Chapter 11bankruptcy proceedings.	The following summarizes the (provision) benefit from income taxes (in thousands):
	In connection with the Company’s emergence from the Chapter 11 bankruptcy proceedings, the Company experienced an “ownership change” as defined in Section 382 of the Internal Revenue Code, or the IRC, as of February 25, 2012. Section 382 of the IRC contains rules that limit the ability of a company that undergoes an “ownership change” to utilize its net operating loss carryforwards and certain built-in losses or deductions recognized during the five-year period after the ownership change. The Company is able to retain a portion of its U.S. federal and state net operating loss and tax credit carryforwards, or the “Tax Attributes”, in connection with the ownership change. However the IRC, Sections 382 and 383 provide an annual limitation with respect to the ability of a corporation to utilize its Tax Attributes against future U.S. taxable income in the event of a change in ownership. In the Company’s situation, the limitation under the IRC will generally be based on the value of the equity (for purposes of the applicable tax rules) on or immediately following the time of emergence. As a result, the Company’s future U.S. taxable income may not be fully offset by the Tax Attributes if such income exceeds the Company’s annual limitation, and the Company may incur a tax liability with respect to such income. In addition, subsequent changes in ownership for purposes of the IRC could further diminish the Company’s ability to utilize Tax Attributes.
	In addition to the impact on Tax Attributes listed above, the Company also is subject to Tax Attribute reduction pursuant to various provisions contained in IRC Section 108(e) related to the Company’s issuance of 44,793,255 shares of Parent’s new Class A Common Stock, $0.01 par value per share and a $75 million principal amount 12% Senior Subordinated Secured Note due 2017, issued by California Lyon in conjunction with the Company’s restructure, in exchange for the claims held by the holders of the formerly outstanding notes of California Lyon. These transactions resulted in Cancellation of Debt (COD) income for income tax purposes of approximately $203 million. IRC Section 108(a)(1)(A) provides that COD income is excluded from gross income when the discharge occurs in a Title 11 case under the jurisdiction of the bankruptcy court. However, pursuant to IRC Section 108(b)(1), if COD income is excluded due to the application of the bankruptcy exception, the amount of excluded COD income must generally be applied to reduce certain tax attributes of the debtor. In general, such attributes would normally be reduced in the following order: (1) net operating losses (current and carryforward); (2) general business tax credits; (3) minimum tax credits; (4) capital loss carryovers; (5) tax basis of the taxpayer’s assets; (6) passive activity losses & credit carryovers; and (7) foreign tax credit carryovers. This Tax Attribute reduction occurred on January 1, 2013.
	Under a provision of the federal tax code finalized in July 2013, the Company employed a tax strategy in its 2012 federal tax return to utilize its federal NOLs by electing to accelerate the recognition of a deferred gain, resulting in positive taxable income and a tax liability for the 2012 tax year. This additional liability and tax provision of approximately $1.2 million was recognized during the three months ended September 30, 2013, with the filing of the 2012 tax return.		Successor			Predecessor
	At September 30, 2013, the Company had no remaining federal net operating loss carryforwards, and $52.5 million remaining state net operating loss carryforwards. State net operating loss carryforwards begin to expire in 2015. In addition, as of September 30, 2013, the Company had unused federal and state built-in losses of $59.6 million and $37.3 million, respectively. The 5 year testing period for built-in losses expires in 2017 and the unused built-in loss carry-forwards begin to expire in 2033.		Period from			Period from				Year Ended
	The Company’s effective income tax rate was 37.3% and 0% for the three months ended September 30, 2013 and 2012, respectively. The effective income tax rate was 26.9% and 0%, respectively, for the nine months ended September 30, 2013 and 2012. The primary drivers of the effective tax rate includes the Company’s positive operating results and estimated domestic production activities deduction, and the one-time election described above related to the filing of the 2012 Federal tax return.		February 25			1-Jan				December 31,
	In assessing the benefits of the deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers taxable income in carry back years, the scheduled reversal of deferred tax liabilities, tax planning strategies and projected future taxable income in making this assessment. As of September 30, 2013, due to uncertainties surrounding the realization of the cumulative federal and state deferred tax assets, the Company has a full valuation allowance against the deferred tax assets. In connection with the Company’s Tax Attribute reduction discussed above, the Company also reduced its valuation allowance on the remaining tax attributes. The valuation allowance as of September 30, 2013 and December 31, 2012, was $117.0 million and $200.0 million, respectively.		through			through
	Effective January 1, 2007, the Company adopted the provisions of FASB Interpretation No. 48, “Accounting for Uncertainty in Income Taxes—an interpretation of FASB Statement No. 109” (“FIN 48”) which is now codified as FASB ASC Topic 740, Income Taxes (“ASC 740”). ASC 740 prescribes a recognition threshold and a measurement criteria for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be considered more likely than not to be sustained upon examination by taxing authorities. The Company has taken positions in certain taxing jurisdictions for which it is more likely than not that previously unrecognized tax benefits will be recognized. The Company records interest and penalties related to uncertain tax positions as a component of the provision for income taxes. At January 1, 2008, and for the periods ended December 31, 2008 through September 30, 2013, the Company had no unrecognized tax benefits.		December 31,			February 24,
	The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Company is subject to U.S. federal income tax examination for calendar tax years ended 2009 through 2012. The Company is subject to various state income tax examinations for calendar tax years ended 2008 through 2012.		2012			2012				2011				2010
		Current
		Interest on uncertain tax provisions	$	—		$	—			$	—			$	75
		Federal		—			—				—				347
		State		(11	)		—				(10	)			(10	)
			$	(11	)	$	—			$	(10	)		$	412
		Income taxes differ from the amounts computed by applying the applicable federal statutory rates due to the following (in thousands):
			Successor					Predecessor
			Period from					Period from				Year Ended
			February 25					1-Jan				December 31,
			through					through
			December 31,					February 24,
			2012					2012				2011				2010
		Benefit (provision) for federal income taxes at the statuatory rate	$	3,098				$	(79,935	)		$	67,662			$	48,019
		Provision for state income taxes, net of federal income tax benefits		(7	)				—				(6	)			(6	)
		Valuation allowance		(2,195	)				(14,991	)			(66,265	)			(47,949	)
		Nondeductible items-reorganization costs		(709	)				94,925				(1,379	)			—
		Nondeductible items-other		(194	)				(3	)			(22	)			—
		Other		(4	)				4				—				348
			$	(11	)			$	—			$	(10	)		$	412
		Temporary differences giving rise to deferred income taxes consist of the following (in thousands):
			December 31,
			2012			2011
		Deferred tax assets
		Impairment and other reserves	$	73,947		$	102,216
		Compensation deductible for tax purposes when paid		987			970
		State income tax provisions deductible when paid for federal tax purposes		4			3
		Effect of book/tax differences for joint ventures		1,002			1,563
		Effect of book/tax differences for capitalized interest/general and administrative		—			891
		Other		318			318
		AMT credit carryover		2,698			2,698
		Unused recognized built-in loss		16,349			—
		Net operating loss		113,314			99,586
		Valuation allowance		(200,048	)		(202,322	)
				8,571			5,923
		Deferred tax liabilities
		Effect of book/tax differences for joint ventures		(5,597	)		(5,923	)
		Effect of book/tax differences for capitalized interest/general and administrative		(2,974	)		—
				(8,571	)		(5,923	)
			$	—		$	—
		At December 31, 2012, the Company had gross federal and state net operating loss carryforwards totaling approximately $243.8 million and $508.3 million, respectively. Federal net operating loss carryforwards begin to expire in 2028 and state net operating loss carryforwards begin to expire in 2013. In addition, as of December 31, 2012, the Company had unused federal and state built-in losses of $42.1 million and $27.9 million, respectively, which expire in 2017.
		In connection with the Company’s emergence from the Chapter 11 bankruptcy proceedings, the Company experienced an “ownership change” as defined in Section 382 of the Internal Revenue Code, or the IRC, as of February 25, 2012. Section 382 of the IRC contains rules that limit the ability of a company that undergoes an “ownership change” to utilize its net operating loss carryforwards and certain built-in losses or deductions recognized during the five-year period after the ownership change. The Company is able to retain a portion of its U.S. federal and state net operating loss and tax credit carryforwards, or the “Tax Attributes”, in connection with the ownership change. However the IRC, Sections 382 and 383 provide an annual limitation with respect to the ability of a corporation to utilize its Tax Attributes against future U.S. taxable income in the event of a change in ownership. In the Company’s situation, the limitation under the IRC will generally be based on the value of the equity (for purposes of the applicable tax rules) on or immediately following the time of emergence. As a result, the Company’s future U.S. taxable income may not be fully offset by the Tax Attributes if such income exceeds the Company’s annual limitation, and the Company may incur a tax liability with respect to such income. In addition, subsequent changes in ownership for purposes of the IRC could further diminish the Company’s ability to utilize Tax Attributes.
		In assessing the benefits of the deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers taxable income in carry back years, the scheduled reversal of deferred tax liabilities, tax planning strategies and projected future taxable income in making this assessment. As of December 31, 2012, due to uncertainties surrounding the realization of the cumulative federal and state deferred tax assets, the Company has a full valuation allowance against the deferred tax assets. The valuation allowance for the years ended December 31, 2012, 2011 and 2010 was $200.0 million, $202.3 million and $125.8 million, respectively.
		Effective January 1, 2007, the Company adopted the provisions of FASB Interpretation No. 48, “Accounting for Uncertainty in Income Taxes—an interpretation of FASB Statement No. 109” (“FIN 48”) which is now codified as FASB ASC 740, Income Taxes. FASB ASC 740 prescribes a recognition threshold and a measurement criteria for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be considered more likely than not to be sustained upon examination by taxing authorities. The Company has taken positions in certain taxing jurisdictions for which it is more likely than not that previously unrecognized tax benefits will be recognized. The Company records interest and penalties related to uncertain tax positions as a component of the provision for income taxes. At January 1, 2008, and for the years ended December 31, 2008 through December 31, 2012, the Company has no unrecognized tax benefits.
		In compliance with the Company’s election to recognize interest income (expense) and penalties related to uncertain tax positions in the income tax provision, $75,000 of interest income related to the income tax refund receivable, recorded under the provisions of FASB ASC 740, is included in the benefit from income taxes for the twelve months ended December 31, 2010.
		The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Company is subject to U.S. federal income tax examination for calendar tax years ending 2009 through 2012. The Company is subject to various state income tax examinations for calendar tax years ending 2008 through 2012.

Business_Combination

Business Combination	9 Months Ended									12 Months Ended
	Sep. 30, 2013									Dec. 31, 2012
Business Combination	'									'
	Note 9—Business Combination									Note 14—Business Combination
	The Company acquired 100.00% of various entities which operate under the Village Homes brand (“Village Homes”) in the Denver metropolitan area, Fort Collins, and Granby, Colorado markets on December 7, 2012. The purchase price was $33.2 million in cash and the acquisition has been accounted for as a business combination in accordance with FASB ASC Topic 805, Business Combinations. Village Homes immediately began operating as a division of the Company, as its Colorado segment. The Village Homes brand was established in 1984 and has been a leading developer and builder of move-up homes, selling more than 10,000 homes in the Denver area over the past 25 years. The acquisition of Village Homes allowed the Company to expand into the Denver market, one of the largest and fastest growing housing markets in the United States, adding a fifth region while diversifying the Company’s existing portfolio. The acquisition eliminated lead-time and start-up costs of expanding into a new market, and provided a platform that can grow significantly without the need for additional general and administrative expenses.									The Company acquired 100% of various entities which operate under the Village Homes brand (“Village Homes”) in the Denver metropolitan area, Fort Collins, and Granby, Colorado markets on December 7, 2012. The purchase price was $33.2 million in cash and the acquisition has been accounted for as a business combination in accordance with FASB ASC Topic 805, Business Combinations. Village Homes immediately began operating as a division of the Company, as its Colorado segment. The Village Homes brand was established in 1984 and has been a leading developer and builder of move-up homes, selling more than 10,000 homes in the Denver area over the past 25 years. The acquisition of Village Homes allowed the Company to expand into the Denver market, one of the largest and fastest growing housing markets in the United States, adding a fifth region while diversifying the Company’s existing portfolio. The acquisition eliminated lead-time and start-up costs of expanding into a new market, and provided a platform that can grow significantly without the need for additional general and administrative expenses.
	The assets and liabilities acquired through the purchase of Village Homes were as follows (in thousands):									The assets and liabilities acquired through the purchase of Village Homes were as follows (in thousands):
	Real estate inventories owned	$	32,923							Real estate inventories owned	$	32,923
	Other assets, net		1,463							Other assets, net		1,463
	Intangibles		907							Intangibles		907
	Receivables		70							Receivables		70
	Accounts payable		(1,029	)						Accounts payable		(1,029	)
	Accrued expenses		(1,133	)						Accrued expenses		(1,133	)
	Cash paid for acquisitions, net	$	33,201							Cash paid for acquisitions, net	$	33,201
	For the three months ended September 30, 2012, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, the below unaudited pro forma information has been prepared to give effect to the Village Homes acquisition as if it occurred on January 1, 2012 (in thousands except number of shares and per share data):
										In connection with the acquisition of Village Homes, the Company incurred acquisition related expenses of $0.2 million which are included in general and administrative expense in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012.
										Since acquisition, Village Homes contributed $5.4 million in home sales revenue and $0.01 million in net income which is included in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012.
		(unaudited)								For the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011, the below unaudited pro forma information has been prepared to give effect to the Village Homes acquisition as if it occurred on January 1, 2011 (in thousands except number of shares and per share data):
		Successor						Predecessor
		Three			Period from			Period from
		Months			February  25			January  1			(unaudited)
		Ended			through			through			Successor			Predecessor
		September 30,			September  30,			February  24,			Period from			Period from		Year Ended
		2012			2012			2012			February 25			January 1		December 31,
	Revenues	$	104,479		$	283,090		$	28,521		through			through		2011
	Net (loss) income available to common stockholders	$	(872	)	$	(9,267	)	$	227,912		December 31,			February 24,
	(Loss) income per common share, basic and diluted	$	(0.07	)	$	(0.79	)	$	227,912		2012			2012
	Weighted average common shares outstanding, basic and diluted		12,408,263			11,716,413			1,000	Revenue	$	405,635		$	28,521	$	261,933
	The pro forma results are not necessarily indicative of the operating results that would have been obtained had the acquisitions occurred at the beginning of the periods presented, nor are they necessarily indicative of future operating results.									Net (loss) income available to common stockholders	$	(9,617	)	$	228,074	$	(189,457	)
										(Loss) income per common share, basic and diluted	$	(0.09	)	$	228,074	$	(189,457	)
										Weighted average common shares outstanding, basic and diluted		103,037,842			1,000		1,000
										The pro forma results are not necessarily indicative of the operating results that would have been obtained had the acquisitions occurred at the beginning of the periods presented, nor are they necessarily indicative of future operating results.

Loss_Income_Per_Common_Share

(Loss) Income Per Common Share	9 Months Ended														12 Months Ended
	Sep. 30, 2013														Dec. 31, 2012
(Loss) Income Per Common Share	'														'
	Note 10—Income (Loss) Per Common Share														Note 15—(Loss) Income Per Common Share
	Basic and diluted income (loss) per common share for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012 were calculated as follows (in thousands, except number of shares and per share amounts):														Basic and diluted (loss) income per common share for the period from February 25, 2012 through December 31, 2012, the period from January 1, 2012 through February 24, 2012 and the year ended December 31, 2011 and 2010 were calculated as follows (in thousands, except number of shares and per share amounts):
			Successor										Predecessor				Successor			Predecessor
			Three		Three			Nine		Nine			Period from				Period from			Period from		Year Ended
			Months Ended		Months  Ended			Months Ended		Months Ended			January 1				February 25			January 1		December 31,
			September 30,		September 30,			September  30,		September  30,			through				through			through
			2013		2012			2013		2012			February  24,				December 31,			February 24,
													2012				2012			2012		2011			2010
	Basic weighted average number of common shares outstanding			30,975,160		12,408,263			22,569,810		11,716,413			1,000	Basic weighted average number of shares outstanding			103,037,842			1,000		1,000			1,000
	Effect of dilutive securities:														Effect of dilutive securities:
	Stock options, unvested common shares, and warrants (1)			920,654		—			877,144		—			N/A	Preferred shares, stock options, and warrants (1)			—			N/A		N/A			N/A
	Diluted average shares outstanding			31,895,814		12,408,263			23,446,954		11,716,413			1,000	Diluted average shares outstanding			103,037,842			1,000		1,000			1,000
	Net income (loss) available to common stockholders		$	7,562	$	(1,507	)	$	10,880	$	(9,409	)	$	228,383	Net (loss) income available to common stockholders		$	(11,602	)	$	228,383	$	(193,330	)	$	(136,786	)
	Basic income (loss) per common share		$	0.24	$	(0.12	)	$	0.48	$	(0.80	)	$	228,383
	Dilutive income (loss) per common share		$	0.24	$	(0.12	)	$	0.46	$	(0.80	)	$	228,383	Basic (loss) income per common share		$	(0.11	)	$	228,383	$	(193,330	)	$	(136,786	)
	Antidilutive securities not included in the calculation of diluted income (loss) per common share (weighted average):														Dilutive (loss) income per common share		$	(0.11	)	$	228,383	$	(193,330	)	$	(136,786	)
	Preferred shares			N/A		7,858,404			N/A		7,858,404			N/A	Antidilutive securities not included in the calculation of diluted (loss) income per common share (weighted average):
	Warrants			N/A		1,907,551			N/A		1,907,551			N/A	Preferred shares			68,002,529			N/A		N/A			N/A
															Vested stock options			3,171,535			N/A		N/A			N/A
	-1	For periods with a net loss, all potentially dilutive shares related to the preferred shares, unvested common shares, and warrants were excluded from the diluted loss per common share calculations because the effect of their inclusion would be antidilutive, or would decrease the reported loss per common share.													Unvested stock options			1,585,767			N/A		N/A			N/A
															Warrants			15,737,294			N/A		N/A			N/A
															-1	For periods with a net loss, all potentially dilutive shares related to the preferred shares, options to acquire common stock, and warrants were excluded from the diluted loss per common share calculations because the effect of their inclusion would be antidilutive, or would decrease the reported loss per common share.

Redeemable_Convertible_Preferr

Redeemable Convertible Preferred Stock	12 Months Ended
	Dec. 31, 2012
Redeemable Convertible Preferred Stock	'
	Note 16—Redeemable Convertible Preferred Stock
	As of December 31, 2012, there were 77,005,744 shares of Convertible Preferred Stock, $0.01 par value per share, or the Convertible Preferred Stock, outstanding, of which 64,831,831 shares were issued in accordance with our plan of reorganization, in exchange for aggregate cash consideration of $50.0 million. In conjunction with the application of fresh start accounting, the fair value of the Convertible Preferred Stock was $56.4 million upon emergence.
	On October 12, 2012, the Company entered into a Subscription Agreement between the Company and WLH Recovery Acquisition LLC, a Delaware limited liability company and investment vehicle managed by affiliates of Paulson & Co. Inc. (“Paulson”), pursuant to which, the Company issued to Paulson (i) 15,238,095 shares of Class A Common Stock, for $16.0 million in cash and (ii) 12,173,913 shares of the Company’s Convertible Preferred Stock, for $14.0 million in cash, for an aggregate purchase price of $30.0 million.
	Our Second Amended and Restated Certificate of Incorporation (the “Charter”) authorizes the issuance of up to 80,000,000 shares of redeemable convertible preferred stock, in one or more series and with such rights, preferences, privileges and restrictions, including voting rights, redemption provisions (including sinking fund provisions), dividend rights, dividend rates, liquidation rates, liquidation preferences and conversion rights, as our board of directors may determine without further action by the holders of common stock.
	Holders of our Convertible Preferred Stock are entitled to receive cumulative dividends at a rate of 6% per annum consisting of (i) cash dividends at the rate of 4% paid quarterly in arrears, and (ii) accreting dividends accruing at the rate of 2% per annum (the “Convertible Preferred Dividends”). During the period from February 25, 2012 through December 31, 2012, the company recorded preferred stock dividends of $2.7 million. During the period from February 25, 2012 through December 31, 2012, $1.7 million was paid in cash and $0.9 million of accreting dividends are included in Convertible Preferred Stock as of December 31, 2012.
	In the event that the Corporation declares or pays any dividends upon any Common Stock (whether payable in cash, securities, other property or otherwise), the Corporation shall also declare and pay to the holders of the Convertible Preferred Stock at the same time that it declares and pays such dividends to the holders of such Common Stock the dividends declared and paid with respect to such Common Stock as if all of the outstanding Convertible Preferred Stock had been converted into such Common Stock immediately prior to the record date for such dividend, or if no record date is fixed, the date as of which the record holders of such Common Stock entitled to such dividends are to be determined.
	Upon the occurrence of the Conversion Date (as defined in the Charter), each share of Convertible Preferred Stock will automatically convert into such number of fully paid and non-assessable shares of Class A Common Stock as is determined by dividing the Convertible Preferred Original Issue Price (as defined in the Charter) by the then applicable Convertible Preferred Conversion Price (as defined in the Charter). In connection with any such conversion, the Company will also pay (i) any accrued but unpaid Convertible Preferred Dividends on any shares of Convertible Preferred Stock being converted (including, without limitation, any accreting dividends not previously paid), which amounts will be paid in cash out of funds legally available therefore if such payment would not violate any covenants imposed by agreements entered into in good faith governing the indebtedness of the Company and its subsidiaries, or, to the extent not so permitted or so available, in shares of Class A Common Stock, based on the fair market value of such common stock at such time, and (ii) in cash, the value of any fractional share of Class A Common Stock otherwise issuable to any such Convertible Preferred Stockholder.
	To the extent not previously converted to common stock, the Company will redeem all the outstanding shares of Convertible Preferred Stock on the fifteenth anniversary of the date of first issuance at a price per share payable in cash and equal to the Convertible Preferred Original Issue Price plus accrued and unpaid Convertible Preferred Dividends in respect thereof.
	The Company initially recorded the redeemable convertible preferred stock at its fair value based on the option pricing model stated above in Note 3. Since the initial measurement and recording of the redeemable convertible preferred stock is greater than its redemption value, the Company would assess the probability of redemption at each reporting date. As of December 31, 2012, the preferred stock is not currently redeemable and ultimate redemption is not currently probable, since the redemption would only occur if the preferred stock is still outstanding in 15 years. In addition, the preferred stock will likely convert to common shares prior to that date. At such time that redemption was deemed probable, the Company would adjust the carrying value to its redemption value with the offsetting adjustment to additional paid in capital. Further, upon a conversion of the preferred into common shares, the carrying value of the preferred stock would be reclassified to common stock and additional paid in capital on that date. The redemption value of the redeemable convertible preferred stock as of December 31, 2012 was $64.0 million, excluding the accreted dividends of $0.9 million.

Equity

Equity	12 Months Ended
	Dec. 31, 2012
Equity	'
	Note 17—Equity
	Common Stock
	As of December 31, 2012, we had 120,105,557 shares of common stock outstanding. In conjunction with the Plan as discussed in Notes 2, 3 and 4, the Company issued the following shares of common stock: (i) 44,793,255 shares of Class A, $0.01 par value per share, in exchange for old senior notes claims, as described above, (ii) 31,464,548 shares of Class B, $0.01 par value per share, in exchange for aggregate consideration of $25 million, and a warrant to purchase 15,737,294 shares of Class B Common Stock, at $2.07 per share, (iii) 12,966,366 shares of Class C, $0.01 par value per share, in exchange for cash consideration of $10.0 million, and (iv) the issuance of an additional 3,144,000 shares of Class C Common Stock to Luxor Capital Group LP as a transaction fee in consideration for providing the backstop commitment of the offering of Class C shares and shares of Convertible Preferred Stock in connection with the Plan. In December 2012, an affiliate of Luxor Capital Group LP elected to convert 90,028 shares of its Class C Common Stock into 90,028 shares of Class A Common Stock.
	On June 28, 2012, the Company consummated the purchase of certain real property (comprising of approximately 165 acres) in San Diego County, California; San Bernardino County, California; Maricopa County, Arizona; and Clark County, Nevada, representing seven separate residential for sale developments, comprising of over 1,000 lots. The aggregate purchase price of the property was $21.5 million. The Company paid $11.0 million cash, and issued 10,000,000 shares of Class A Common Stock, to investment vehicles managed by affiliates of Colony Capital, LLC as consideration for the property.
	On October 1, 2012, the Company approved the grant of an aggregate of 3,120,000 restricted shares of Class D common stock of the Company, and an aggregate of 4,757,302 options to purchase shares of Class D common stock of the Company, of which 1,115,302 represent “five-year” options and 3,642,000 represent “ten-year” options to certain officers of California Lyon. In addition, the Company granted 256,500 shares of Restricted Stock to its non-employee directors, which were fully vested on the date of grant.
	On October 12, 2012, the Company entered into a Subscription Agreement between the Company and WLH Recovery Acquisition LLC, a Delaware limited liability company and investment vehicle managed by affiliates of Paulson & Co. Inc. (“Paulson”), pursuant to which, the Company issued to Paulson (i) 15,238,095 shares of Class A Common Stock, for $16.0 million in cash and (ii) 12,173,913 shares of the Company’s Convertible Preferred Stock, for $14.0 million in cash, for an aggregate purchase price of $30.0 million.
	Upon the occurrence of the Conversion Date, each share of Class C Common Stock will automatically convert into one share of Class A Common Stock, and each share of Class B Common Stock will automatically convert into one share of Class A Common Stock, if a majority of the shares of Class B Common Stock then outstanding vote in favor of such conversion. If, at any time (whether before, on or after the Conversion Date),
	any share of Class B Common Stock is not owned, beneficially or of record, by either General William Lyon or William H. Lyon, their sibling, spouses and lineal descendants, any entities wholly owned by one or more of the foregoing persons, or any trusts or other estate planning vehicles for the benefit of any of the foregoing, then such share of Class B Common Stock will automatically convert into one share of Class A Common Stock.
	All of our outstanding shares of common stock have been validly issued and fully paid and are non-assessable. The rights of the holders of common stock will be subject to, and may be adversely affected by, the rights of the holders of preferred stock. Holders of our common stock have no preference, exchange, sinking fund, redemption or appraisal rights and have no preemptive rights to subscribe for any of our securities.
	With the exception of the dividends to be paid out to holders of our Convertible Preferred Stock, the Company does not intend to declare or pay cash dividends in the foreseeable future. Any determination to pay dividends to holders of our common stock will be at the discretion of our board of directors. The payment of cash dividends is restricted under the terms of our Amended and Restated Senior Secured Term Loan Agreement and the indenture governing the Notes.
	In conjunction with the adoption of fresh start accounting, the Company allocated the fair market value of the common stock of $43.1 million as of February 24, 2012.
	Warrants
	The holders of Class B Common Stock hold warrants to purchase 15,737,294 shares of Class B Common Stock at an exercise price of $2.07 per share. The expiration date of the Class B Warrants is February 24, 2017. The Warrants were assigned a value of $1.0 million in conjunction with the adoption of fresh start accounting and are recorded in additional paid-in capital.

Stock_Based_Compensation

Stock Based Compensation

9 Months Ended

12 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Stock Based Compensation

'

'

Note 11—Stock Based Compensation

Note 18—Stock Based Compensation

We account for share-based awards in accordance with ASC Topic 718, Compensation-Stock Compensation, which requires the fair value of stock-based compensation awards to be amortized as an expense over the vesting period. Stock-based compensation awards are valued at the fair value on the date of grant. Compensation expense for awards with performance based conditions is recognized over the vesting period once achievement of the performance condition is deemed probable.

In 2012, the Company adopted the William Lyon Homes 2012 Equity Incentive Plan (the “Plan”). The Plan was approved by the Board of Directors and the Company’s stockholders, and is administered by the Compensation Committee of the Board. The provisions of the Plan allow for a variety of stock-based compensation awards, including stock options, stock appreciation rights, or SARs, restricted stock awards, restricted stock unit awards, deferred stock awards, deferred stock unit awards, dividend equivalent awards, stock payment awards and performance awards and other stock-based awards, to certain executives, directors, and non-executives of California Lyon. The Company believes that such awards provide a means of compensation to attract and retain qualified employees and better align the interests of our employees with those of our stockholders. Option awards are granted with an exercise price equal to the market price at the date of grant.

During the three and nine months ended September 30, 2013, the Company granted 3,996 and 80,284, respectively, shares of restricted stock. No performance based restricted stock was issued during the three months ended September 30, 2013, however, 291,444 shares were issued during the nine months ended September 30, 2013.

Under the plan, 13,699,565 shares of the Company’s Class D common stock have been reserved for issuance. In 2012, the Company granted an aggregate of 2,499,293 restricted shares of Class D common stock of the Company, and an aggregate of 4,757,302 stock options to purchase shares of Class D common stock of the Company, of which 1,115,302 represent “five-year” options and 3,642,000 represent “ten-year” options.

Each of the performance based restricted stock awards vests as follows: One-third of the shares of performance based restricted stock will vest on each of the first, second and third anniversaries of the grant date, subject to the Company’s achievement of a pre-established return on equity target as of the end of the 2013 fiscal year and each officer’s continued service through each vesting date. As of September 30, 2013, the Company considers the current performance condition to be probable, thus $1.0 million of compensation expense has been recognized for these awards to date.

The five-year options are subject to mandatory exercise upon the earlier of an initial public offering (“IPO”) of the Company, or five years, provided, that if the IPO occurs prior to the applicable vesting date of the options, such options will be exercised upon the applicable vesting date. The five-year options and ten-year options will be incentive stock options to the maximum extent permitted by law. Each of the restricted stock and option awards vests as follows: 50% of the shares and options vested on October 1, 2012, the date of grant, with the remaining 50% of the shares and options vesting in three equal installments on each of December 31, 2012, 2013 and 2014, subject to the recipient’s continued employment through the applicable vesting date and accelerated vesting as set forth in the applicable award agreement. In addition, the Company granted 256,500 shares of Restricted Stock to its non-employee directors, which were fully vested on the date of grant.

Each of the restricted stock awards vests as follows: 50% of the shares of restricted stock will vest on each of the first and second anniversaries of the grant date. In addition, the Company granted 0 and 40,998 shares of restricted stock to its non-employee directors during the three and nine months ended September 30, 2013, respectively, which have a one year vesting schedule, with 25% vesting each quarter.

The Company uses the fair value method of accounting for stock options granted to employees which requires us to measure the cost of employee services received in exchange for the stock options, based on the grant date fair value of the award. The fair value of the awards is estimated using the Black-Scholes option-pricing model. The resulting cost is recognized on a straight line basis over the period during which an employee is required to provide service in exchange for the award, usually the vesting period.

Stock based compensation expense during the three and nine months ended September 30, 2013 was $0.9 million and $2.2 million, respectively.

The fair value of each employee option awarded was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions.

Period from

February 25, 2012

through December 31,

2012

2011

2010

Expected dividend yield

0

%

N/A

N/A

Risk-free interest rate

0.55

%

N/A

N/A

Expected volatility

79

%

N/A

N/A

Expected life (in years)

4.73

N/A

N/A

The Black-Scholes option-pricing model requires inputs such as the risk-free interest rate, expected term and expected volatility. Further, the forfeiture rate also affects the amount of aggregate compensation. These inputs are subjective and generally require significant judgment.

The risk-free interest rate that we use is based on the United States Treasury yield in effect at the time of grant for zero coupon United States Treasury notes with maturities approximating each grant’s expected life. Given our limited history with employee grants, we use the “simplified” method in estimating the expected term for our employee grants. The “simplified” method is calculated as the average of the time-to-vesting and the contractual life of the options. Our expected volatility is derived from the historical volatilities of several unrelated public companies within the homebuilding industry, because we have no trading history on our common stock. When making the selections of our peer companies within the homebuilding industry to be used in the volatility calculation, we also considered the stage of development, size and financial leverage of potential comparable companies. We estimate our forfeiture rate based on an analysis of our actual forfeitures, of which we had none, and will continue to evaluate the appropriateness of the forfeiture rate based on actual forfeiture experience, analysis of employee turnover behavior and other factors.

Summary of Stock Option Activity

Stock option activity under the Plan at December 31, 2012 and changes during the period from February 25, 2012 through December 31, 2012 were as follows (there is no activity in prior periods as the options were granted in the fourth quarter of 2012):

Period from February 25, 2012 through

December 31, 2012

Options

Weighted

Weighted

Aggregate

Average

Average

Intrinsic

Exercise

Remaining

Value

Price

Contractual

Life (in years)

Options outstanding at beginning of year

—

N/A

N/A

N/A

Granted (1)

4,757,302

$

1.05

4.48

$

—

Exercised

—

N/A

N/A

N/A

Cancelled

—

N/A

N/A

N/A

Options outstanding at end of year

4,757,302

$

1.05

4.48

$

—

Options vested and expected to vest

4,757,302

$

1.05

4.48

$

—

Options exercisable at end of year (2)

3,171,535

$

1.05

4.48

$

—

Price range of options exercised

N/A

Price range of options outstanding

$

1.05

Total shares available for future grants at end of year

6,442,970

-1

The weighted average grant date fair value of the stock options was $0.64.

-2

The fair value of shares vested during the period from February 25, 2012 through December 31, 2012 was $2.0 million.

The following table summarizes information associated with stock options granted to executives, directors, and non-executives that are vested and expected to vest in future reporting periods:

Period from February 25, 2012 through

December 31, 2012

Number of

Weighted

Weighted

Aggregate

Shares

Average

Average

Intrinsic

Exercise

Remaining

Value

Price

Contractual

Life (in years)

Executives

4,467,892

$

1.05

Directors

—

N/A

Non-Executives

289,410

$

1.05

Total

4,757,302

$

1.05

4.48

$

—

The following table summarizes information associated with stock options granted to executives, directors, and non-executives that are exercisable at December 31, 2012:

Period from February 25, 2012 through

December 31, 2012

Number of

Weighted

Weighted

Aggregate

Shares

Average

Average

Intrinsic

Exercise

Remaining

Value

Price

Contractual

Life (in years)

Executives

2,978,595

$

1.05

Directors

—

N/A

Non-Executives

192,940

$

1.05

Total

3,171,535

$

1.05

4.48

$

—

Summary of Nonvested (Restricted) Shares Activity

Period from February 25, 2012

through December 31, 2012

Number of

Weighted

Shares

Average Grant

Date Fair Value

Non-vested shares at beginning of year

—

N/A

Granted

2,499,293

$

1.05

Vested

1,592,965

$

1.05

Cancelled

—

$

1.05

Non-vested shares at end of year

906,328

$

1.05

In conjunction with the issuance of the equity grants in October 2012, the Company recorded stock based compensation expense of $3.7 million which is included in general and administrative expense in the consolidated statement of operations for the period from February 25, 2012 through December 31, 2012, and expects to record approximately $1.0 million per year thereafter. There was no stock based compensation expense recognized in the years ended December 31, 2011 and 2010. As of December 31, 2012, $2.0 million of total unrecognized stock based compensation expense is expected to be recognized as an expense by the Company in the future over a weighted average period of two years. The total value of restricted stock awards which fully vested during the period from February 25, 2012 through December 31, 2012 was $1.7 million. There is no recognized tax benefit for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 25, 2012 and the year ended December 31, 2011, and 2010.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended					12 Months Ended
	Sep. 30, 2013					Dec. 31, 2012
Commitments and Contingencies	'					'
	Note 12—Commitments and Contingencies					Note 19—Commitments and Contingencies
	The Company’s commitments and contingent liabilities include the usual obligations incurred by real estate developers in the normal course of business. In the opinion of management, these matters will not have a material effect on the Company’s condensed consolidated financial position, results of operations or cash flows.					The Company’s commitments and contingent liabilities include the usual obligations incurred by real estate developers in the normal course of business. In the opinion of management, these matters will not have a material effect on the Company’s consolidated financial position, results of operations or cash flows.
						The Company is a defendant in various lawsuits related to its normal business activities. We believe that the accruals we have recorded for probable and reasonably estimable losses with respect to these proceedings are adequate and that, as of December 31, 2012, it was not reasonably possible that an additional material loss had been incurred in an amount in excess of the estimated amounts already recognized on our consolidated financial statements. We evaluate our accruals for litigation and regulatory proceedings at least quarterly and, as appropriate, adjust them to reflect (i) the facts and circumstances known to us at the time, including information regarding negotiations, settlements, rulings and other relevant events and developments; (ii) the advice and analyses of counsel; and (iii) the assumptions and judgment of management. Similar factors and considerations are used in establishing new accruals for proceedings as to which losses have become probable and reasonably estimable at the time an evaluation is made. Based on our experience, we believe that the amounts that may be claimed or alleged against us in these proceedings are not a meaningful indicator of our potential liability. The outcome of any of these proceedings, including the defense and other litigation-related costs and expenses we may incur, however, is inherently uncertain and could differ significantly from the estimate reflected in a related accrual, if made. Therefore, it is possible that the ultimate outcome of any proceeding, if in excess of a related accrual or if no accrual had been made, could be material to our consolidated financial statements.
	The Company is a defendant in various lawsuits related to its normal business activities. We believe that the accruals we have recorded for probable and reasonably estimable losses with respect to these proceedings are adequate and that, as of September 30, 2013, it was not reasonably possible that an additional material loss had been incurred in an amount in excess of the estimated amounts already recognized on our condensed consolidated financial statements.					We have non-cancelable operating leases primarily associated with our office facilities. Rent expense under cancelable and non-cancelable operating leases totaled $2.6 million, $0.7 million, $4.4 million and $4.4 million in the period from February 25, 2012 through December 31, 2012, the period from January 1, 2012 through February 24, 2012 and the years ended December 31, 2011 and 2010, respectively, and is included in general and administrative expense in our consolidated statements of operations for the respective periods. The table below shows the future minimum payments under non-cancelable operating leases at December 31, 2012 (in thousands).
	We have non-cancelable operating leases primarily associated with our office facilities. Rent expense under cancelable and non-cancelable operating leases totaled $0.4 million, $0.7 million, $1.3 million, $2.1 million, and $0.7 million, in the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, respectively, and is included in general and administrative expense in our consolidated statements of operations for the respective periods. The table below shows the future minimum payments under non-cancelable operating leases at September 30, 2013 (in thousands).
						Year Ended December 31
	Year Ending December 31					2013		$	1,349
	2013	$	370			2014			1,260
	2014		1,393			2015			618
	2015		731			2016			556
	2016		671			2017			580
	2017		697			Thereafter			2,654
	Thereafter		2,734
						Total		$	7,017
	Total	$	6,596
						In some jurisdictions in which the Company develops and constructs property, assessment district bonds are issued by municipalities to finance major infrastructure improvements. As a land owner benefited by these improvements, the Company is responsible for the assessments on its land. When properties are sold, the assessments are either prepaid or the buyers assume the responsibility for the related assessments. Assessment district bonds issued after May 21, 1992 are accounted for under the provisions of EITF 91-10, “Accounting for Special Assessment and Tax Increment Financing Entities” issued by the Emerging Issues Task Force of the Financial Accounting Standards Board on May 21, 1992, now codified as FASB ASC Topic 970-470, Real Estate—Debt, and recorded as liabilities in the Company’s consolidated balance sheet, if the amounts are fixed and determinable.
	As of September 30, 2013 and December 31, 2012, the Company had $0.9 million and $0.9 million, respectively, in deposits as collateral for outstanding surety bonds to guarantee the Company’s financial obligations under certain contractual arrangements in the normal course of business. The standby letters of credit were secured by cash as reflected as restricted cash on the accompanying consolidated balance sheet.					As of December 31, 2012, the Company had $0.9 million in deposits as collateral for outstanding irrevocable standby letters of credit to guarantee the Company’s financial obligations under certain contractual arrangements in the normal course of business. The standby letters of credit were secured by cash as reflected as restricted cash on the accompanying consolidated balance sheet. The beneficiary may draw upon these letters of credit in the event of a contractual default by the Company relating to each respective obligation. These letters of credit generally have a stated term of 12 months and have varying maturities throughout 2013, at which time the Company may be required to renew to coincide with the term of the respective arrangement.
	The Company also had outstanding performance and surety bonds of $48.4 million at September 30, 2013, related principally to its obligations for site improvements at various projects. The Company does not believe that draws upon these bonds, if any, will have a material effect on the Company’s financial position, results of operations or cash flows. As of September 30, 2013, the Company had $92.4 million, of project commitments relating to the construction of projects.					The Company also had outstanding performance and surety bonds of $64.4 million at December 31, 2012 related principally to its obligations for site improvements at various projects. The Company does not believe that draws upon these bonds, if any, will have a material effect on the Company’s financial position, results of operations or cash flows. As of December 31, 2012, the Company had $60.9 million of project commitments relating to the construction of projects.
	See Note 5 for additional information relating to the Company’s guarantee arrangements.					The Company has provided unsecured environmental indemnities to certain lenders, joint venture partners and land sellers. In each case, the Company has performed due diligence on the potential environmental risks including obtaining an independent environmental review from outside environmental consultants. These indemnities obligate the Company to reimburse the guaranteed parties for damages related to environmental matters. There is no term or damage limitation on these indemnities; however, if an environmental matter arises, the Company could have recourse against other previous owners.
	In addition to the land bank agreement discussed below, the Company has entered into various purchase option agreements with third parties to acquire land. As of September 30, 2013, the Company has made non-refundable deposits of $25.4 million. The Company is under no obligation to purchase the land, but would forfeit remaining deposits if the land were not purchased. The total remaining purchase price under the option agreements is $238.6 million as of September 30, 2013.					See Note 10 for additional information relating to the Company’s guarantee arrangements.
	Land Banking Arrangements					In addition to the land bank agreements discussed below, the Company has entered into various purchase option agreements with third parties to acquire land. As of December 31, 2012, the Company has made non-refundable deposits of $3.8 million. The Company is under no obligation to purchase the land, but would forfeit remaining deposits if the land were not purchased. The total purchase price under the option agreements is $97.1 million as of December 31, 2012.
	The Company enters into purchase agreements with various land sellers. As a method of acquiring land in staged takedowns, thereby minimizing the use of funds from the Company’s available cash or other corporate financing sources and limiting the Company’s risk, the Company transfers the Company’s right in such purchase agreements to entities owned by third parties (“land banking arrangements”). These entities use equity contributions and/or incur debt to finance the acquisition and development of the land. The entities grant the Company an option to acquire lots in staged takedowns. In consideration for this option, the Company makes a non-refundable deposit of 15% to 25% of the total purchase price. The Company is under no obligation to purchase the balance of the lots, but would forfeit existing deposits of $14.7 million and could be subject to penalties if the lots were not purchased. The Company does not have legal title to these entities or their assets and has not guaranteed their liabilities. These land banking arrangements help the Company manage the financial and market risk associated with land holdings.					Land Banking Arrangements
	The Company participates in one land banking arrangement, which is not a VIE in accordance with ASC 810, but which is consolidated in accordance with FASB ASC Topic 470, Debt (“ASC 470”). Under the provisions of ASC 470, the Company has determined it is economically compelled, based on certain factors, to purchase the land in the land banking arrangement. The Company has recorded the remaining purchase price of the land of $20.7 million and $39.0 million, which is included in real estate inventories not owned and liabilities from inventories not owned in the accompanying consolidated balance sheet as of September 30, 2013 and December 31, 2012, respectively, and represents the remaining net cash to be paid on the remaining land takedowns.					The Company enters into purchase agreements with various land sellers. As a method of acquiring land in staged takedowns, thereby minimizing the use of funds from the Company’s available cash or other corporate financing sources and limiting the Company’s risk, the Company transfers the Company’s right in such purchase agreements to entities owned by third parties (“land banking arrangements”). These entities use equity contributions and/or incur debt to finance the acquisition and development of the land. The entities grant the Company an option to acquire lots in staged takedowns. In consideration for this option, the Company makes a non-refundable deposit of 15% to 25% of the total purchase price. The Company is under no obligation to purchase the balance of the lots, but would forfeit existing deposits and could be subject to penalties if the lots were not purchased. The Company does not have legal title to these entities or their assets and has not guaranteed their liabilities. These land banking arrangements help the Company manage the financial and market risk associated with land holdings. ASC 810 requires the consolidation of the assets, liabilities and operations of the Company’s land banking arrangements that are VIEs, of which none existed at December 31, 2012.
						The Company participates in one land banking arrangement, which is not a VIE in accordance with ASC 810, but which is consolidated in accordance with FASB ASC Topic 470, Debt (“ASC 470”). Under the provisions of ASC 470, the Company has determined it is economically compelled, based on certain factors, to purchase the land in the land banking arrangement. The Company has recorded the remaining purchase price of the land of $39.0 million, which is included in real estate inventories not owned and liabilities from inventories not owned in the accompanying consolidated balance sheet as of December 31, 2012, and represents the remaining net cash to be paid on the remaining land takedowns.
	Summary information with respect to the Company’s land banking arrangements is as follows as of the periods presented (dollars in thousands):					In 2012, the Company made additional deposits of $2.5 million. In conjunction with the deposits, the Company reduced real estate inventories not owned and liabilities from inventories not owned in the amount of $2.5 million.
						Summary information with respect to the Company’s land banking arrangements is as follows as of the periods presented (dollars in thousands):
		Successor
		September 30,		December 31,				Successor		Predecessor
		2013		2012				December 31,
	Total number of land banking projects		1		1			2012		2011
						Total number of land banking projects			1		1
	Total number of lots		610		610
						Total number of lots (1)			610		625
	Total purchase price	$	161,465	$	161,465
						Total purchase price		$	161,465	$	161,465
	Balance of lots still under option and not purchased:
	Number of lots		105		199	Balance of lots still under option and not purchased:
						Number of lots			199		225
	Purchase price	$	20,738	$	39,029
						Purchase price		$	39,029	$	47,408
	Forfeited deposits if lots are not purchased	$	14,737	$	27,734
						Forfeited deposits if lots are not purchased		$	27,734	$	25,234
						-1	Total number of lots in the land banking project was reduced by 15 as of December 31, 2012 as compared to December 31, 2011 because of a change in product mix in future projects.

Subsequent_Events

Subsequent Events	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Subsequent Events	'	'
	Note 13—Subsequent Events	Note 20—Subsequent Events
	No events have occurred subsequent to September 30, 2013, other than that listed below, that has required recognition or disclosure in the Company’s financial statements.	No events have occurred subsequent to December 31, 2012, other than that listed below, that have required recognition or disclosure in the Company’s financial statements.
	Issuance of Additional 8.5% Senior Notes Due November 15, 2020	On May 21, 2013, the Company completed its initial public offering of 10,005,000 shares of Class A Common Stock, which consisted of 7,177,500 shares sold by the Company and 2,827,500 shares sold by the selling stockholder. The 10,005,000 shares in the offering were sold at a price to the public of $25.00 per share. The Company raised total net proceeds of approximately $165.0 million in the offering, after deducting the underwriting discount and estimated offering expenses. The Company did not receive any proceeds from the sale of shares by the selling stockholder.
	On October 24, 2013, California Lyon completed the sale to certain purchasers of an additional $100.0 million in aggregate principal amount of its 8.5% Senior Notes due 2020 (the “Additional Notes”) at an issue price of 106.5% of their aggregate principal amount, plus accrued interest from and including May 15, 2013, in a private placement, resulting in net proceeds of approximately $104.7 million. The Additional Notes were issued pursuant to an indenture, dated as of November 8, 2012 (as amended or supplemented, the “Indenture”), by and among California Lyon, Parent, the subsidiary guarantors party thereto (together with Parent, the “Guarantors”) and U.S. Bank National Association, as trustee, under which California Lyon previously issued $325.0 million in aggregate principal amount of its 8.5% Senior Notes due 2020 (the “Existing Notes” and, together with the Additional Notes, the “Notes”). The Additional Notes and the Existing Notes will be treated as a single class for all purposes under the Indenture and will have identical terms to the Existing Notes (see Note 5 for terms of Existing Notes).	In connection with the offering, the Company completed a common stock recapitalization which included a 1-for-8.25 reverse stock split of its Class A Common Stock (the “Class A Reverse Split”), the conversion of all outstanding shares of the Company’s Class C Common Stock, Class D Common Stock and Convertible Preferred Stock into Class A Common Stock on a one-for-one basis and as automatically adjusted for the Class A Reverse Split, and a 1-for-8.25 reverse stock split of its Class B Common Stock. Upon completion of the offering, the Company had 27,623,629 shares of Class A Common Stock outstanding, excluding shares issuable upon exercise of outstanding stock options, and 3,813,885 shares of Class B Common Stock outstanding, excluding shares underlying a warrant to purchase additional shares of Class B Common Stock. The warrant was amended to extend the term from five years to ten years, and the Warrant will now expire on February 24, 2022.
	The Company and Parent intend to use the net proceeds from the issuance of the Additional Notes for general corporate purposes, including the acquisition and development of land and home construction.	The tables below show the proforma effect of the 1-for-8.25 reverse stock split as of and for the Successor periods presented. The 1-for-8.25 reverse stock split should not be retroactively applied to the Predecessor periods as the Company’s reorganization was a recapitalization event, thus the Predecessor period is not meant to be comparable with the Successor period.
	Closure of CB&T Loan
	On October 30, 2013 the Company terminated its $30.0 million revolving credit facility with California Bank & Trust (see Note 5 for terms of the CB&T Loan). The Company had repaid all balances owed under this facility during July of 2013, and had no amounts outstanding as of September 30, 2013. The CB&T Loan was originally scheduled to mature on March 5, 2016.
			December 31, 2012
			Before			After
			stock split			stock split
		William Lyon Homes shares outstanding
		Common stock, Class A		70,121,378			8,499,558
		Common stock, Class B		31,464,548			3,813,885
		Common stock, Class C		16,020,338			1,941,859
		Common stock, Class D		2,499,293			302,945
		Total number of shares outstanding		120,105,557			14,558,246
			Period from February 25
			through December 31, 2012
			Before			After
			stock split			stock split
		(Loss) income per common share, basic and diluted	$	(0.11	)	$	(0.93	)
		Weighted average common shares outstanding, basic and diluted		103,037,842			12,489,435

Unaudited_Summarized_Quarterly

Unaudited Summarized Quarterly Financial Information	12 Months Ended
	Dec. 31, 2012
Unaudited Summarized Quarterly Financial Information	'
	Note 21— Unaudited Summarized Quarterly Financial Information
	Summarized unaudited quarterly financial information for the years ended December 31, 2012 and 2011 is as follows (in thousands except per share data):
		Predecessor					Successor
		Period from					Period from
		January 1					February 25
		through					through				Three Months Ended
		February  24,					March  31,				June 30,				September 30,			December 31,
		2012					2012				2012				2012			2012
	Sales	$	16,687				$	15,109			$	145,051			$	85,942		$	102,833
	Cost of sales		(14,598	)				(13,063	)			(131,272	)			(70,795	)		(82,859	)
	Gross profit		2,089					2,046				13,779				15,147			19,974
	Other income, costs and expenses, net		226,408					(7,028	)			(14,836	)			(14,681	)		(21,262	)
	Net income (loss)		228,497					(4,982	)			(1,057	)			466			(1,288	)
	Net income (loss) available to common stockholders	$	228,383				$	(5,351	)		$	(2,550	)		$	(1,507	)	$	(2,194	)
	Income (loss) per common share, basic and diluted	$	228,383				$	(0.06	)		$	(0.03	)		$	(0.01	)	$	(0.02	)
		Predecessor
		Three Months Ended
		March 31,			June 30,				September 30,				December 31,
		2011			2011				2011				2011
	Sales	$	36,574		$	57,795			$	53,703			$	58,983
	Cost of sales		(31,885	)		(51,121	)			(46,645	)			(59,072	)
	Gross profit (loss)		4,689			6,674				7,058				(89	)
	Other income, costs and expenses, net		(15,866	)		(17,759	)			(46,758	)			(130,837	)
	Net loss		(11,177	)		(11,095	)			(39,700	)			(130,926	)
	Net loss attributable to William Lyon Homes	$	(11,225	)	$	(11,171	)		$	(39,634	)		$	(131,300	)
	Loss per common share, basic and diluted	$	(11,225	)	$	(11,171	)		$	(39,634	)		$	(131,300	)

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Basis of Presentation and Significant Accounting Policies	'
	Note 1—Basis of Presentation and Significant Accounting Policies
	Operations
	William Lyon Homes, a Delaware corporation (“Parent” and together with its subsidiaries, the “Company”), are primarily engaged in designing, constructing, marketing and selling single-family detached and attached homes in California, Arizona, Nevada and Colorado (under the Village Homes brand).
	Initial Public Offering
	On May 21, 2013, the Company completed its initial public offering of 10,005,000 shares of Class A Common Stock, which consisted of 7,177,500 shares sold by the Company and 2,827,500 shares sold by the selling stockholder. The 10,005,000 shares in the offering were sold at a price to the public of $25.00 per share. The Company raised total net proceeds of approximately $163.8 million in the offering, after deducting the underwriting discount and offering expenses. The Company did not receive any proceeds from the sale of shares by the selling stockholder.
	The Company’s authorized capital stock consists of 190,000,000 shares, 150,000,000 of which are designated as Class A Common Stock with a par value of $0.01 per share, 30,000,000 of which are designated as Class B Common Stock with a par value of $0.01 per share and 10,000,000 of which are designated as preferred stock with a par value of $0.01 per share.
	In connection with the initial public offering, Parent completed a common stock recapitalization which included a 1-for-8.25 reverse stock split of its Class A Common Stock (the “Class A Reverse Split”), the conversion of all outstanding shares of Parent’s Class C Common Stock, Class D Common Stock and Convertible Preferred Stock into Class A Common Stock on a one-for-one basis and as automatically adjusted for the Class A Reverse Split, and a 1-for-8.25 reverse stock split of its Class B Common Stock. The effect of the reverse stock split is retroactively applied to the Condensed Consolidated Balance Sheet as of December 31, 2012, the Condensed Consolidated Statements of Operations for the three months ended September 30, 2012, and the period from February 25, 2012 through September 30, 2012, and the Condensed Consolidated Statement of Equity, presented herein. Upon completion of the initial public offering, Parent had 27,623,629 shares of Class A Common Stock outstanding, excluding shares issuable upon exercise of outstanding stock options and restricted shares that have been granted but were unvested, and 3,813,884 shares of Class B Common Stock outstanding, excluding shares underlying a warrant to purchase additional shares of Class B Common Stock. The warrant was amended to extend the term from five years to ten years, and the warrant will now expire on February 24, 2022. The change to the warrant had no corresponding impact on the financial statements.
	Basis of Presentation
	The preparation of the Company’s financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of the assets and liabilities as of September 30, 2013 and December 31, 2012 and revenues and expenses for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through September 30, 2012. Accordingly, actual results could differ from those estimates. The significant accounting policies using estimates include real estate inventories and cost of sales, impairment of real estate inventories, warranty reserves, loss contingencies, sales and profit recognition, accounting for variable interest entities, valuation of deferred tax assets, and fresh start accounting. The current economic environment increases the uncertainty inherent in these estimates and assumptions.
	The condensed consolidated financial statements include the accounts of the Company and all majority-owned and controlled subsidiaries and joint ventures, and certain joint ventures and other entities which have been determined to be variable interest entities (“VIEs”) in which the Company is considered the primary beneficiary (see Note 2). The accounting policies of the joint ventures are substantially the same as those of the Company. All significant intercompany accounts and transactions have been eliminated in consolidation.
	We applied the accounting under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 852 (“ASC 852”), “Reorganizations,” as of February 24, 2012. Therefore, our consolidated balance sheet as of December 31, 2012, which is referred to as that of the “Successor”, includes adjustments resulting from the reorganization and application of ASC 852. References to the “Successor” in the condensed consolidated financial statements and the notes thereto refer to the Company after giving effect to the reorganization and application of ASC 852. References to the “Predecessor” refer to the Company prior to the reorganization and application of ASC 852.
	The condensed consolidated financial statements were prepared from our books and records without audit and include all adjustments (consisting of only normal recurring accruals) necessary to present a fair statement of results for the interim periods presented. Readers of this quarterly report should refer to our audited consolidated financial statements as of December 31, 2012, and for the periods from January 1, 2012 through February 24, 2012 and February 25, 2012 through December 31, 2012, which are included in our 2012 Annual Report on Form 10-K, as certain disclosures that would substantially duplicate those contained in the audited financial statements have not been included in this report.
	Real Estate Inventories
	The Company accounts for its real estate inventories under FASB ASC Topic 360 Property, Plant, & Equipment (“ASC 360”). Real estate inventories are carried at cost net of impairment losses and fresh start accounting adjustments, if any. Real estate inventories consist primarily of land deposits, land and land under development, homes completed and under construction, and model homes. All direct and indirect land costs, offsite and onsite improvements and applicable interest and other carrying charges are capitalized to real estate projects during periods when the project is under development. Land, offsite costs and all other common costs are allocated to land parcels benefited based upon relative fair values before construction. Onsite construction costs and related carrying charges (principally interest and property taxes) are allocated to the individual homes within a phase based upon the relative sales value of the homes. The Company relieves its accumulated real estate inventories through cost of sales for the estimated cost of homes sold. Selling expenses and other marketing costs are expensed in the period incurred.
	ASC 360 requires impairment losses to be recorded on real estate inventories when indicators of impairment are present and the undiscounted cash flows estimated to be generated by real estate inventories are less than the carrying amount of such assets. Indicators of impairment include a decrease in demand for housing due to softening market conditions, competitive pricing pressures, which reduce the average sales price of homes including an increase in sales incentives offered to buyers, slowing sales absorption rates, decreases in home values in the markets in which the Company operates, significant decreases in gross margins and a decrease in project cash flows for a particular project.
	Management assesses land deposits for impairment when estimated land values are deemed to be less than the agreed upon contract price. The Company considers changes in market conditions, the timing of land purchases, the ability to renegotiate with land sellers, the terms of the land option contracts in question, the availability and best use of capital, and other factors. The Company records abandoned land deposits and related pre-acquisition costs in cost of sales-lots, land and other in the consolidated statements of operations in the period that it is abandoned.
	A provision for warranty costs relating to the Company’s limited warranty plans is included in cost of sales and accrued expenses at the time the sale of a home is recorded. The Company generally reserves approximately one to one and one quarter percent of the sales price of its homes against the possibility of future charges relating to its one-year limited warranty and similar potential claims, except for Colorado, where the Company provides a third party warranty policy upon close of escrow. Factors that affect the Company’s warranty liability include the number of homes under warranty, historical and anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the amounts as necessary. Changes in the Company’s warranty liability for the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, are as follows (in thousands):
		Successor						Predecessor
		Nine			Period from			Period from
		Months Ended			February 25			January 1 through
		September 30,			through			February 24, 2012
		2013			September 30,
					2012
	Warranty liability, beginning of period	$	14,317		$	14,000		$	14,314
	Warranty provision during period		3,131			1,649			187
	Warranty payments during period		(3,900	)		(1,944	)		(845	)
	Warranty charges related to pre-existing warranties during period		354			80			85
	Warranty charges related to construction services projects		267			347			114
	Fresh start adjustment		—			—			145
	Warranty liability, end of period	$	14,169		$	14,132		$	14,000
	Interest incurred under the Company’s debt obligations, as more fully discussed in Note 5, is capitalized to qualifying real estate projects under development. Any additional interest charges related to real estate projects not under development are expensed in the period incurred. Interest activity for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, are as follows (in thousands):
		Successor											Predecessor
		Three Months			Three Months			Nine Months			Period from		Period from
		Ended			Ended			Ended			February 25		January 1
		September 30,			September 30,			September 30,			through		through
		2013			2012			2013			September 30,		February 24,
											2012		2012
	Interest incurred	$	7,511		$	8,729		$	22,511		$	22,336	$	7,145
	Less: Interest capitalized		7,460			6,238			19,909			15,009		4,638
	Interest expense, net of amounts capitalized	$	51		$	2,491		$	2,602		$	7,327	$	2,507
	Cash paid for interest	$	283		$	6,315		$	14,854		$	18,061	$	8,924
	Construction Services
	The Company accounts for construction management agreements using the Percentage of Completion Method in accordance with FASB ASC Topic 605 Revenue Recognition (“ASC 605”). Under ASC 605, the Company records revenues and expenses as a contracted project progresses, and based on the percentage of costs incurred to date compared to the total estimated costs of the contract.
	The Company entered into construction management agreements to build, sell and market homes in certain communities. For such services, the Company will receive fees (generally 3 to 5 percent of the sales price, as defined) and may, under certain circumstances, receive additional compensation if certain financial thresholds are achieved.
	Financial Instruments
	Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents, receivables, and deposits. The Company typically places its cash and cash equivalents in investment grade short-term instruments. Deposits, included in other assets, are due from municipalities or utility companies and are generally collected from such entities through fees assessed to other developers. The Company is an issuer of, or subject to, financial instruments with off-balance sheet risk in the normal course of business which exposes it to credit risks. These financial instruments include letters of credit and obligations in connection with assessment district bonds. These off-balance sheet financial instruments are described in more detail in Note 12.
	Cash and Cash Equivalents
	Short-term investments with a maturity of three months or less when purchased are considered cash equivalents. The Company’s cash and cash equivalents balance exceeds federally insurable limits as of September 30, 2013 and December 31, 2012. The Company monitors the cash balances in its operating accounts and adjusts the cash balances between accounts based on operational needs; however, these cash balances could be negatively impacted if the underlying financial institutions fail or are subject to other adverse conditions in the financial markets. To date, the Company has experienced no loss or lack of access to cash in its operating accounts.
	Restricted Cash
	Restricted cash consists of deposits made by the Company to a bank account as collateral for the use of letters of credit to guarantee the Company’s financial obligations under certain other contractual arrangements in the normal course of business.
	Deferred Loan Costs
	Deferred loan costs represent debt issuance cost and are primarily amortized to interest expense using the straight line method which approximates the effective interest method.
	Goodwill
	In accordance with the provisions of ASC 350, Intangibles, Goodwill and Other, goodwill amounts are not amortized, but rather are analyzed for impairment at the reporting segment level. Goodwill is analyzed on an annual basis, or when indicators of impairment exist. We have determined that we have five reporting segments, as discussed in Note 3, and we perform an annual goodwill impairment analysis during the fourth quarter of each fiscal year.
	Intangible Assets
	Recorded intangible assets primarily relate to construction homes in backlog, management contracts, and joint venture management fee contracts recorded in conjunction with ASC 852 and FASB ASC Topic 805, Business Combinations, related to the Village Homes acquisition in 2012 (see Note 9 for more information). Such assets were valued based on expected cash flows related to home closings, and the asset is amortized on a per unit basis, as homes under the contracts close.
	Income (loss) per common share
	The Company computes income (loss) per common share in accordance with FASB ASC Topic 260, Earnings per Share. Basic income (loss) per common share is computed by dividing income or loss available to common stockholders by the weighted average number of shares of common stock outstanding. For purposes of determining diluted income (loss) per common share, basic income (loss) per common share is further adjusted to include the effect of potential dilutive common shares outstanding.
	Income Taxes
	Income taxes are accounted for under the provisions of FASB ASC Topic 740, Income Taxes (“ASC 740”), using an asset and liability approach. Deferred income taxes reflect the net effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, and operating loss and tax credit carryforwards measured by applying currently enacted tax laws. A valuation allowance is provided to reduce net deferred tax assets to an amount that is more likely than not to be realized.
	Reclassifications
	Certain balances on the financial statements and certain amounts presented in the notes have been reclassified in order to conform to current year presentation.

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended														12 Months Ended
	Sep. 30, 2013														Dec. 31, 2012
Operations	'														'
															Operations
															William Lyon Homes, a Delaware corporation (“Parent” and together with its subsidiaries, the “Company”), are primarily engaged in designing, constructing and selling single family detached and attached homes in California, Arizona, Nevada and Colorado (under the Village Homes brand).
Basis of Presentation	'														'
	Basis of Presentation														Basis of Presentation
	The preparation of the Company’s financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of the assets and liabilities as of September 30, 2013 and December 31, 2012 and revenues and expenses for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from January 1, 2012 through February 24, 2012, and the period from February 25, 2012 through September 30, 2012. Accordingly, actual results could differ from those estimates. The significant accounting policies using estimates include real estate inventories and cost of sales, impairment of real estate inventories, warranty reserves, loss contingencies, sales and profit recognition, accounting for variable interest entities, valuation of deferred tax assets, and fresh start accounting. The current economic environment increases the uncertainty inherent in these estimates and assumptions.														We applied the accounting under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 852 (“ASC 852”), “Reorganizations,” as of February 24, 2012 (see Note 3). Therefore, our consolidated balance sheet as of December 31, 2012, which is referred to as that of the “Successor”, includes adjustments resulting from the reorganization and application of ASC 852 and is not comparable to our balance sheet as of December 31, 2011, which is referred to as that of the “Predecessor”. References to the “Successor” in the consolidated financial statements and the notes thereto refer to the Company after giving effect to the reorganization and application of ASC 852. References to the “Predecessor” refer to the Company prior to the reorganization and application of ASC 852.
	The condensed consolidated financial statements include the accounts of the Company and all majority-owned and controlled subsidiaries and joint ventures, and certain joint ventures and other entities which have been determined to be variable interest entities (“VIEs”) in which the Company is considered the primary beneficiary (see Note 2). The accounting policies of the joint ventures are substantially the same as those of the Company. All significant intercompany accounts and transactions have been eliminated in consolidation.														The preparation of the Company’s financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of the assets and liabilities as of December 31, 2012 and 2011 and revenues and expenses for the period from January 1, 2012 through February 24, 2012, period from February 25, 2012 through December 31, 2012, and years ended December 31, 2011 and 2010. Accordingly, actual results could differ from those estimates. The significant accounting policies using estimates include real estate inventories and cost of sales, impairment of real estate inventories, warranty reserves, loss contingencies, sales and profit recognition, accounting for variable interest entities, and fresh start accounting. The current economic environment increases the uncertainty inherent in these estimates and assumptions.
	We applied the accounting under Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 852 (“ASC 852”), “Reorganizations,” as of February 24, 2012. Therefore, our consolidated balance sheet as of December 31, 2012, which is referred to as that of the “Successor”, includes adjustments resulting from the reorganization and application of ASC 852. References to the “Successor” in the condensed consolidated financial statements and the notes thereto refer to the Company after giving effect to the reorganization and application of ASC 852. References to the “Predecessor” refer to the Company prior to the reorganization and application of ASC 852.														The consolidated financial statements include the accounts of the Company and all majority-owned and controlled subsidiaries and joint ventures, and certain joint ventures and other entities which have been determined to be variable interest entities in which the Company is considered the primary beneficiary (see Note 5). The accounting policies of the joint ventures are substantially the same as those of the Company. All significant intercompany accounts and transactions have been eliminated in consolidation.
	The condensed consolidated financial statements were prepared from our books and records without audit and include all adjustments (consisting of only normal recurring accruals) necessary to present a fair statement of results for the interim periods presented. Readers of this quarterly report should refer to our audited consolidated financial statements as of December 31, 2012, and for the periods from January 1, 2012 through February 24, 2012 and February 25, 2012 through December 31, 2012, which are included in our 2012 Annual Report on Form 10-K, as certain disclosures that would substantially duplicate those contained in the audited financial statements have not been included in this report.
Real Estate Inventories	'														'
	Real Estate Inventories														Real Estate Inventories
	The Company accounts for its real estate inventories under FASB ASC Topic 360 Property, Plant, & Equipment (“ASC 360”). Real estate inventories are carried at cost net of impairment losses and fresh start accounting adjustments, if any. Real estate inventories consist primarily of land deposits, land and land under development, homes completed and under construction, and model homes. All direct and indirect land costs, offsite and onsite improvements and applicable interest and other carrying charges are capitalized to real estate projects during periods when the project is under development. Land, offsite costs and all other common costs are allocated to land parcels benefited based upon relative fair values before construction. Onsite construction costs and related carrying charges (principally interest and property taxes) are allocated to the individual homes within a phase based upon the relative sales value of the homes. The Company relieves its accumulated real estate inventories through cost of sales for the estimated cost of homes sold. Selling expenses and other marketing costs are expensed in the period incurred.														Real estate inventories are carried at cost net of impairment losses, if any. Real estate inventories consist primarily of land deposits, land and land under development, homes completed and under construction, and model homes. All direct and indirect land costs, offsite and onsite improvements and applicable interest and other carrying charges are capitalized to real estate projects during periods when the project is under development. Land, offsite costs and all other common costs are allocated to land parcels benefited based upon relative fair values before construction. Onsite construction costs and related carrying charges (principally interest and property taxes) are allocated to the individual homes within a phase based upon the relative sales value of the homes. The Company relieves its accumulated real estate inventories through cost of sales for the estimated cost of homes sold. Selling expenses and other marketing costs are expensed in the period incurred. A provision for warranty costs relating to the Company’s limited warranty plans is included in cost of sales and accrued expenses at the time the sale of a home is recorded. The Company generally reserves approximately one to one and one quarter percent of the sales price of its homes against the possibility of future charges relating to its one-year limited warranty and similar potential claims. Factors that affect the Company’s warranty liability include the number of homes under warranty, historical and anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the amounts as necessary. Changes in the Company’s warranty liability for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011and 2010 are as follows (in thousands):
	ASC 360 requires impairment losses to be recorded on real estate inventories when indicators of impairment are present and the undiscounted cash flows estimated to be generated by real estate inventories are less than the carrying amount of such assets. Indicators of impairment include a decrease in demand for housing due to softening market conditions, competitive pricing pressures, which reduce the average sales price of homes including an increase in sales incentives offered to buyers, slowing sales absorption rates, decreases in home values in the markets in which the Company operates, significant decreases in gross margins and a decrease in project cash flows for a particular project.
	Management assesses land deposits for impairment when estimated land values are deemed to be less than the agreed upon contract price. The Company considers changes in market conditions, the timing of land purchases, the ability to renegotiate with land sellers, the terms of the land option contracts in question, the availability and best use of capital, and other factors. The Company records abandoned land deposits and related pre-acquisition costs in cost of sales-lots, land and other in the consolidated statements of operations in the period that it is abandoned.
	A provision for warranty costs relating to the Company’s limited warranty plans is included in cost of sales and accrued expenses at the time the sale of a home is recorded. The Company generally reserves approximately one to one and one quarter percent of the sales price of its homes against the possibility of future charges relating to its one-year limited warranty and similar potential claims, except for Colorado, where the Company provides a third party warranty policy upon close of escrow. Factors that affect the Company’s warranty liability include the number of homes under warranty, historical and anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the amounts as necessary. Changes in the Company’s warranty liability for the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, are as follows (in thousands):															Successor			Predecessor
																Period from			Period from			Year Ended
																February 25			January 1			December  31,
		Successor						Predecessor								through			through
		Nine			Period from			Period from								December 31,			February 24,
		Months Ended			February 25			January 1 through								2012			2012			2011			2010
		September 30,			through			February 24, 2012							Warranty liability, beginning of period	$	14,000		$	14,314		$	16,341		$	21,365
		2013			September 30,										Warranty provision during period		2,731			187			2,380			2,574
					2012										Warranty payments during period		(3,216	)		(845	)		(4,699	)		(8,277	)
	Warranty liability, beginning of period	$	14,317		$	14,000		$	14,314						Warranty charges related to pre-existing warranties during period		802			199			292			679
	Warranty provision during period		3,131			1,649			187						Fresh start adjustment		—			145			—			—
	Warranty payments during period		(3,900	)		(1,944	)		(845	)
	Warranty charges related to pre-existing warranties during period		354			80			85						Warranty liability, end of period	$	14,317		$	14,000		$	14,314		$	16,341
	Warranty charges related to construction services projects		267			347			114
	Fresh start adjustment		—			—			145						Interest incurred under the Company’s debt obligations, as more fully discussed in Note 10, is capitalized to qualifying real estate projects under development. Any additional interest charges related to real estate projects not under development are expensed in the period incurred. Interest activity for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011and 2010 are as follows (in thousands):
	Warranty liability, end of period	$	14,169		$	14,132		$	14,000
																Successor			Predecessor
																Period from			Period from			Year Ended
	Interest incurred under the Company’s debt obligations, as more fully discussed in Note 5, is capitalized to qualifying real estate projects under development. Any additional interest charges related to real estate projects not under development are expensed in the period incurred. Interest activity for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, are as follows (in thousands):															February 25			January 1			December 31,
																through			through
																December 31,			February 24,
		Successor											Predecessor			2012			2012			2011			2010
		Three Months			Three Months			Nine Months			Period from		Period from		Interest incurred	$	30,526		$	7,145		$	61,464		$	62,791
		Ended			Ended			Ended			February 25		January 1		Less: Interest capitalized		(21,399	)		(4,638	)		(36,935	)		(39,138	)
		September 30,			September 30,			September 30,			through		through
		2013			2012			2013			September 30,		February 24,		Interest expense, net of amounts capitalized	$	9,127		$	2,507		$	24,529		$	23,653
											2012		2012
	Interest incurred	$	7,511		$	8,729		$	22,511		$	22,336	$	7,145	Cash paid for interest	$	26,560		$	8,924		$	48,018		$	59,748
	Less: Interest capitalized		7,460			6,238			19,909			15,009		4,638
	Interest expense, net of amounts capitalized	$	51		$	2,491		$	2,602		$	7,327	$	2,507
	Cash paid for interest	$	283		$	6,315		$	14,854		$	18,061	$	8,924
Construction Services	'														'
	Construction Services														Construction Services
	The Company accounts for construction management agreements using the Percentage of Completion Method in accordance with FASB ASC Topic 605 Revenue Recognition (“ASC 605”). Under ASC 605, the Company records revenues and expenses as a contracted project progresses, and based on the percentage of costs incurred to date compared to the total estimated costs of the contract.														The Company accounts for construction management agreements using the Percentage of Completion Method in accordance with FASB ASC Topic 605 Revenue Recognition (“ASC 605”). Under ASC 605, the Company records revenues and expenses as a contracted project progresses, and based on the percentage of costs incurred to date compared to the total estimated costs of the contract.
	The Company entered into construction management agreements to build, sell and market homes in certain communities. For such services, the Company will receive fees (generally 3 to 5 percent of the sales price, as defined) and may, under certain circumstances, receive additional compensation if certain financial thresholds are achieved.														The Company entered into construction management agreements to build, sell and market homes in certain communities. For such services, the Company will receive fees (generally 3 to 5 percent of the sales price, as defined) and may, under certain circumstances, receive additional compensation if certain financial thresholds are achieved.
Financial Instruments	'														'
	Financial Instruments														Financial Instruments
	Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents, receivables, and deposits. The Company typically places its cash and cash equivalents in investment grade short-term instruments. Deposits, included in other assets, are due from municipalities or utility companies and are generally collected from such entities through fees assessed to other developers. The Company is an issuer of, or subject to, financial instruments with off-balance sheet risk in the normal course of business which exposes it to credit risks. These financial instruments include letters of credit and obligations in connection with assessment district bonds. These off-balance sheet financial instruments are described in more detail in Note 12.														Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash investments, receivables, and deposits. The Company typically places its cash investments in investment grade short-term instruments. Deposits, included in other assets, are due from municipalities or utility companies and are generally collected from such entities through fees assessed to other developers. The Company is an issuer of, or subject to, financial instruments with off-balance sheet risk in the normal course of business which exposes it to credit risks. These financial instruments include letters of credit and obligations in connection with assessment district bonds. These off-balance sheet financial instruments are described in more detail in Note 19.
Cash And Cash Equivalents	'														'
	Cash and Cash Equivalents														Cash and Cash Equivalents
	Short-term investments with a maturity of three months or less when purchased are considered cash equivalents. The Company’s cash and cash equivalents balance exceeds federally insurable limits as of September 30, 2013 and December 31, 2012. The Company monitors the cash balances in its operating accounts and adjusts the cash balances between accounts based on operational needs; however, these cash balances could be negatively impacted if the underlying financial institutions fail or are subject to other adverse conditions in the financial markets. To date, the Company has experienced no loss or lack of access to cash in its operating accounts.														Short-term investments with a maturity of three months or less when purchased are considered cash equivalents. The Company’s cash and cash equivalents balance exceeds federally insurable limits as of December 31, 2012 and 2011. The Company monitors the cash balances in its operating accounts and adjusts the cash balances as appropriate; however, these cash balances could be negatively impacted if the underlying financial institutions fail or are subject to other adverse conditions in the financial markets. To date, the Company has experienced no loss or lack of access to cash in its operating accounts.
Restricted Cash	'														'
															Restricted Cash
															Restricted cash consists of deposits made by the Company to a bank account as collateral for the use of letters of credit to guarantee the Company’s financial obligations under certain other contractual arrangements in the normal course of business.
Deferred Loan Costs	'														'
	Deferred Loan Costs														Deferred Loan Costs
	Deferred loan costs represent debt issuance cost and are primarily amortized to interest expense using the straight line method which approximates the effective interest method.														Deferred loan costs represent debt issuance cost and are primarily amortized to interest expense using the straight line method which approximates the effective interest method.
Goodwill	'														'
	Goodwill														Goodwill
	In accordance with the provisions of ASC 350, Intangibles, Goodwill and Other, goodwill amounts are not amortized, but rather are analyzed for impairment at the reporting segment level. Goodwill is analyzed on an annual basis, or when indicators of impairment exist. We have determined that we have five reporting segments, as discussed in Note 3, and we perform an annual goodwill impairment analysis during the fourth quarter of each fiscal year.														In accordance with the provisions of ASC 350, Intangibles, Goodwill and Other, goodwill amounts are not amortized, but rather are analyzed for impairment at the reporting segment level. Goodwill is analyzed on an annual basis, or when indicators of impairment exist. We have determined that we have five reporting segments, as discussed in Note 6, and we will perform an annual goodwill impairment analysis during the fourth quarter of each fiscal year, with the first annual testing carried out in the fourth quarter of fiscal year 2012.
Intangible Assets	'														'
	Intangible Assets														Intangible Assets
	Recorded intangible assets primarily relate to construction homes in backlog, management contracts, and joint venture management fee contracts recorded in conjunction with ASC 852 and FASB ASC Topic 805, Business Combinations, related to the Village Homes acquisition in 2012 (see Note 9 for more information). Such assets were valued based on expected cash flows related to home closings, and the asset is amortized on a per unit basis, as homes under the contracts close.														Recorded intangible assets primarily relate to construction management contracts, homes in backlog, and joint venture management fee contracts recorded in conjunction with ASC 852. Such assets were valued based on expected cash flows related to home closings, and the asset is amortized on a per unit basis, as homes under the contracts close.
Income (loss) per common share	'														'
	Income (loss) per common share														Income (loss) per common share
	The Company computes income (loss) per common share in accordance with FASB ASC Topic 260, Earnings per Share. Basic income (loss) per common share is computed by dividing income or loss available to common stockholders by the weighted average number of shares of common stock outstanding. For purposes of determining diluted income (loss) per common share, basic income (loss) per common share is further adjusted to include the effect of potential dilutive common shares outstanding.														The Company computes income (loss) per common share in accordance with FASB ASC Topic 260, Earnings per Share, which requires income (loss) per common share for each class of stock to be calculated using the two-class method. The two-class method is an allocation of income (loss) between the holders of common stock and a company’s participating security holders.
															Basic income (loss) per common share is computed by dividing income or loss available to common stockholders by the weighted average number of shares of common stock outstanding. For purposes of determining diluted income (loss) per common share, basic income (loss) per common share is further adjusted to include the effect of potential dilutive common shares outstanding.
Income Taxes	'														'
	Income Taxes														Income Taxes
	Income taxes are accounted for under the provisions of FASB ASC Topic 740, Income Taxes (“ASC 740”), using an asset and liability approach. Deferred income taxes reflect the net effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, and operating loss and tax credit carryforwards measured by applying currently enacted tax laws. A valuation allowance is provided to reduce net deferred tax assets to an amount that is more likely than not to be realized.														Income taxes are accounted for under the provisions of Financial Accounting Standards Board ASC 740, Income Taxes, using an asset and liability approach. Deferred income taxes reflect the net effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, and operating loss and tax credit carryforwards measured by applying currently enacted tax laws. A valuation allowance is provided to reduce net deferred tax assets to an amount that is more likely than not to be realized. ASC 740 prescribes a recognition threshold and a measurement criteria for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be considered “more-likely-than-not” to be sustained upon examination by taxing authorities. The Company has taken positions in certain taxing jurisdictions for which it is more likely than not that previously unrecognized tax benefits will be recognized. In addition, the Company has elected to recognize interest and penalties related to uncertain tax positions in the income tax provision.
Impact Of Recent Accounting Pronouncements	'														'
															Impact of Recent Accounting Pronouncements
															In 2011, the FASB issued ASU 2011-04, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs. This ASU represents the converged guidance of the FASB and the IASB (the Boards) on fair value measurement and results in common requirements for measuring fair value and for disclosing information about fair value measurements, including a consistent meaning of the term “fair value.” Our adoption of these new provisions of ASU 2011-04 on January 1, 2012 did not have an impact on our consolidated financial statements.
															In 2012, the FASB issued ASU 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment. The amendments permit an entity first to assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with Subtopic 350-30. Previous guidance required an entity to test indefinite-lived intangible assets for impairment, on at least an annual basis, by comparing the fair value of the asset with its carrying amount. If the carrying amount of the intangible asset exceeds its fair value, an entity should recognize an impairment loss in the amount of that excess. An entity has the option not to calculate annually the fair value of an indefinite-lived intangible asset if the entity determines that it is not more likely than not that the asset is impaired. For the year ended December 31, 2012, the Company did not elect to use qualitative assessment option permitted by this amendment; however, the Company anticipates using the qualitative assessment option in future periods.
Reclassifications	'														'
															Reclassifications
															Certain balances on the financial statements and certain amounts presented in the notes have been reclassified in order to conform to current year presentation.
Operations	'														'
	Operations
	William Lyon Homes, a Delaware corporation (“Parent” and together with its subsidiaries, the “Company”), are primarily engaged in designing, constructing, marketing and selling single-family detached and attached homes in California, Arizona, Nevada and Colorado (under the Village Homes brand).
Initial Public Offering	'														'
	Initial Public Offering
	On May 21, 2013, the Company completed its initial public offering of 10,005,000 shares of Class A Common Stock, which consisted of 7,177,500 shares sold by the Company and 2,827,500 shares sold by the selling stockholder. The 10,005,000 shares in the offering were sold at a price to the public of $25.00 per share. The Company raised total net proceeds of approximately $163.8 million in the offering, after deducting the underwriting discount and offering expenses. The Company did not receive any proceeds from the sale of shares by the selling stockholder.
	The Company’s authorized capital stock consists of 190,000,000 shares, 150,000,000 of which are designated as Class A Common Stock with a par value of $0.01 per share, 30,000,000 of which are designated as Class B Common Stock with a par value of $0.01 per share and 10,000,000 of which are designated as preferred stock with a par value of $0.01 per share.
	In connection with the initial public offering, Parent completed a common stock recapitalization which included a 1-for-8.25 reverse stock split of its Class A Common Stock (the “Class A Reverse Split”), the conversion of all outstanding shares of Parent’s Class C Common Stock, Class D Common Stock and Convertible Preferred Stock into Class A Common Stock on a one-for-one basis and as automatically adjusted for the Class A Reverse Split, and a 1-for-8.25 reverse stock split of its Class B Common Stock. The effect of the reverse stock split is retroactively applied to the Condensed Consolidated Balance Sheet as of December 31, 2012, the Condensed Consolidated Statements of Operations for the three months ended September 30, 2012, and the period from February 25, 2012 through September 30, 2012, and the Condensed Consolidated Statement of Equity, presented herein. Upon completion of the initial public offering, Parent had 27,623,629 shares of Class A Common Stock outstanding, excluding shares issuable upon exercise of outstanding stock options and restricted shares that have been granted but were unvested, and 3,813,884 shares of Class B Common Stock outstanding, excluding shares underlying a warrant to purchase additional shares of Class B Common Stock. The warrant was amended to extend the term from five years to ten years, and the warrant will now expire on February 24, 2022. The change to the warrant had no corresponding impact on the financial statements.
Restricted Cash	'														'
	Restricted Cash
	Restricted cash consists of deposits made by the Company to a bank account as collateral for the use of letters of credit to guarantee the Company’s financial obligations under certain other contractual arrangements in the normal course of business.
Reclassifications	'														'
	Reclassifications
	Certain balances on the financial statements and certain amounts presented in the notes have been reclassified in order to conform to current year presentation.

Basis_of_Presentation_and_Sign3

Basis of Presentation and Significant Accounting Policies (Tables)	9 Months Ended														12 Months Ended
	Sep. 30, 2013														Dec. 31, 2012
Summary of Changes in Warranty Liability	'														'
	Changes in the Company’s warranty liability for the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, are as follows (in thousands):														liability and adjusts the amounts as necessary. Changes in the Company’s warranty liability for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011and 2010 are as follows (in thousands):
		Successor						Predecessor								Successor			Predecessor
		Nine			Period from			Period from								Period from			Period from			Year Ended
		Months Ended			February 25			January 1 through								February 25			January 1			December  31,
		September 30,			through			February 24, 2012								through			through
		2013			September 30,											December 31,			February 24,
					2012											2012			2012			2011			2010
	Warranty liability, beginning of period	$	14,317		$	14,000		$	14,314						Warranty liability, beginning of period	$	14,000		$	14,314		$	16,341		$	21,365
	Warranty provision during period		3,131			1,649			187						Warranty provision during period		2,731			187			2,380			2,574
	Warranty payments during period		(3,900	)		(1,944	)		(845	)					Warranty payments during period		(3,216	)		(845	)		(4,699	)		(8,277	)
	Warranty charges related to pre-existing warranties during period		354			80			85						Warranty charges related to pre-existing warranties during period		802			199			292			679
	Warranty charges related to construction services projects		267			347			114						Fresh start adjustment		—			145			—			—
	Fresh start adjustment		—			—			145
															Warranty liability, end of period	$	14,317		$	14,000		$	14,314		$	16,341
	Warranty liability, end of period	$	14,169		$	14,132		$	14,000
Schedule Of Interest Incurred Under Company's Debt Obligations	'														'
	Interest activity for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, are as follows (in thousands):														development are expensed in the period incurred. Interest activity for the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011and 2010 are as follows (in thousands):
		Successor											Predecessor			Successor			Predecessor
		Three Months			Three Months			Nine Months			Period from		Period from			Period from			Period from			Year Ended
		Ended			Ended			Ended			February 25		January 1			February 25			January 1			December 31,
		September 30,			September 30,			September 30,			through		through			through			through
		2013			2012			2013			September 30,		February 24,			December 31,			February 24,
											2012		2012			2012			2012			2011			2010
	Interest incurred	$	7,511		$	8,729		$	22,511		$	22,336	$	7,145	Interest incurred	$	30,526		$	7,145		$	61,464		$	62,791
	Less: Interest capitalized		7,460			6,238			19,909			15,009		4,638	Less: Interest capitalized		(21,399	)		(4,638	)		(36,935	)		(39,138	)
	Interest expense, net of amounts capitalized	$	51		$	2,491		$	2,602		$	7,327	$	2,507	Interest expense, net of amounts capitalized	$	9,127		$	2,507		$	24,529		$	23,653
	Cash paid for interest	$	283		$	6,315		$	14,854		$	18,061	$	8,924	Cash paid for interest	$	26,560		$	8,924		$	48,018		$	59,748

Fresh_Start_Accounting_and_Eff1

Fresh Start Accounting and Effects of the Plan (Tables)	12 Months Ended
	Dec. 31, 2012
Fresh Start Consolidated Balance Sheet	'
	The following fresh start consolidated balance sheet presents the implementation of the Plan and the adoption of fresh start accounting as of the Effective Date. Reorganization adjustments have been recorded within the consolidated balance sheet to reflect the effects of the Plan, including discharge of liabilities subject to compromise and the adoption of fresh start accounting in accordance with ASC 852.
	CONSOLIDATED BALANCE SHEETS
	(in thousands except number of shares and par value per share)
			February 24, 2012
			Predecessor			Plan of			Fresh Start			Successor
						Reorganization			Accounting
						Adjustments			Adjustments
	ASSETS
	Cash and cash equivalents		$	12,787		$	67,746	(a)	$	—		$	80,533
	Restricted cash			852			—			—			852
	Receivables			12,790			—			(996	)(m)		11,794
	Real estate inventories
	Owned			405,632			4,029	(b)		(1,198	)(n)		408,463
	Not owned			46,158			—			—			46,158
	Property & equipment, net			962			—			(421	)(o)		541
	Deferred loan costs			8,258			(5,767	)(c)		—			2,491
	Goodwill			—			—			14,209	(p)		14,209
	Intangibles			—			—			9,470	(q)		9,470
	Other assets			6,307			47	(d)		—			6,354
	Total assets		$	493,746		$	66,055		$	21,064		$	580,865
	LIABILITIES AND EQUITY (DEFICIT)
	Liabilities not subject to compromise
	Accounts payable		$	10,000		$	—		$	—		$	10,000
	Accrued expenses			31,391			—			221	(r)		31,612
	Liabilities from inventories not owned			46,158			—			—			46,158
	Notes payable			78,394			(5,000	)(f)		1,100	(s)		74,494
	Senior Secured Term Loan due January 31, 2015			206,000			29,000	(g)		—			235,000
	Senior Subordinated Secured Notes due February 25, 2017			—			75,000	(h)		—			75,000
				371,943			99,000			1,321			472,264
	Liabilities subject to compromise
	Accrued expenses			15,297			(15,297	)(e)		—			—
	75/8% Senior Notes due December 15, 2012			66,704			(66,704	)(e)		—			—
	103/4% Senior Notes due April 1, 2013			138,964			(138,964	)(e)		—			—
	71/2% Senior Notes due February 15, 2014			77,867			(77,867	)(e)		—			—
				298,832			(298,832	)		—			—
	Redeemable convertible preferred stock			—			56,386	(i)		—			56,386
	Equity (deficit):
	William Lyon Homes stockholders’ equity (deficit)
	Common stock, Class A			—			448	(j)		—			448
	Common stock, Class B			—			315	(j)		—			315
	Common stock, Class C			—			161	(j)		—			161
	Additional paid-in capital			48,867			(21,177	)(k)		15,501	(t)		43,191
	Accumulated deficit			(235,584	)		229,754	(l)		5,830	(u)		—
	Total William Lyon Homes stockholder’s equity (deficit)			(186,717	)		209,501			21,331			44,115
	Noncontrolling interest			9,688			—			(1,588	)(v)		8,100
	Total equity (deficit)			(177,029	)		209,501			19,743			52,215
	Total liabilities and equity (deficit)		$	493,746		$	66,055		$	21,064		$	580,865
	Notes to Plan of Reorganization and Fresh Start Accounting Adjustments:
	a	Reflects net cash received of $81.0 million from the issuance of new equity, reduced by the repayment of DIP financing of $5.2 million, payment of financing fees of $2.6 million and other reorganization related costs of $5.4 million.
	b	Reflects contribution of land option deposit in lieu of cash for Class B Common Stock.
	c	Reflects the write-off of the remaining deferred loan costs of the Old Notes net of capitalization of deferred loan costs related to the Amended Term Loan.
	d	Reflects prepaid property taxes to obtain title insurance for the second lien notes. Deferred tax assets are not reflected on the balance sheet as they have been fully reserved.
	e	Reflects the extinguishment of liabilities subject to compromise (“LSTC”) at emergence. LSTC was comprised of $283.5 million of Old Notes and $15.3 million of related accrued interest. The holders of the Old Notes received Class A common stock of the Successor entity.
	f	Reflects repayment of amounts outstanding under the DIP Credit Agreement pursuant to the Plan.
	g	Reflects the additional principal added to the Amended Term Loan, in accordance with the Plan.
	h	Reflects the issuance of Senior Subordinated Secured Notes of $75.0 million, in accordance with the Plan.
	i	Reflects the fair value of the Convertible Preferred Stock issued pursuant to the Plan. The fair value of the total residual equity interest of $100.5 million was determined based on the enterprise value of $485.0 million determined as of the date of the plan, less the $384.5 million fair value of Long-Term debt. Cash received for the convertible preferred was $50.0 million, however as discussed previously, the Company valued the redeemable convertible preferred stock at $56.4 million.
	j	Reflects the issuance of 92.4 million total shares in new common stock at $0.01 par value and the extinguishment of 1,000 shares ($0.01 par) of Old Common Stock, in accordance with the plan (see Note 2 for allocation of shares).
	k	Reflects the elimination of $48.9 million of additional paid-in capital (“APIC”) relating to Old Common Stock, offset by $27.7 million of net cash received from the issuance of the Class B and Class C shares of common stock.
	l	Reflects the elimination of $235.6 million of accumulated deficit of the Predecessor company in addition to the net impact of Plan adjustments to assets, liabilities and stockholder’s equity.
	m	Reflects adjustment of $1.0 million to notes receivable with a book value of $6.2 million to fair value of $5.2 million using the discounted cash flow approach. The Company discounted the future interest to be received at a discount rate of 10%, which is above the stated rate of the note.
	n	Reflects adjustment of $1.2 million to real estate inventory using the discounted cash flow approach. The Company used project forecasts and an unlevered discount rate of 20% to arrive at fair value. Certain projects that are held for future development were valued on an “As-Is” Basis using market comparables.
	o	Reflects adjustment of $0.4 million to property and equipment with a book value of $1.0 million to fair value of $ $0.6 million, based on the estimated sales value of the assets determined on an “As Is” Basis using market comparables.
p	Goodwill represents the excess of enterprise value upon emergence over fair value of net tangible and identifiable intangible assets acquired.
q	Reflects identifiable intangible assets comprised of $4.6 million relating to construction management contracts, $4.0 million relating to homes in backlog, and $0.8 million relating to joint venture management fees. The value of the construction management contracts and the joint venture management fees was estimated using the discounted cash flows of each related project at a discount rate ranging from 17% to 19%. The value of the backlog contracts was determined using the With/Without method of the income approach and the expected closing date of the home in backlog and the contracted sales price of the home.
r	Reflects adjustments to warranty and construction defect litigation liabilities which were valued based on the estimated costs of warranty spending on homes previously closed plus an estimated margin of 9.4%, plus a reasonable margin required to transfer the liability or to fulfill the obligation.
s	Reflects adjustment of one note payable of $(0.2) million, with a book value of $6.5 million to a fair value of $6.3 million. The Company used a discounted cash flow on contracted interest and principal to be received and a risk adjusted discount rate of 12.5%. Also reflects adjustment of one note payable of $1.3 million, with a book value of $55.0 million to a fair value of $56.3 million. The Company used a discounted cash flow on contracted interest and principal to be received and a risk adjusted discount rate of 12.5%.
t	Reflects the adjustment to a combined common stock and warrants value of $44.1 million for the calculation of fair value under the provisions of fresh start accounting, based on the remaining residual equity interest of $100.5 million, as discussed in note (i) above, less the allocation to convertible preferred of $56.4 million, as also discussed in note (i).
u	Reflects the elimination of a balance in accumulated deficit of $5.8 million to reduce any accumulated deficit or retained earnings in conjunction with fresh start accounting, which requires the successor entity to begin with a zero balance in retained earnings.
v	Reflects adjustment of $1.6 million to minority interest in a consolidated entity with a book value of $9.7 million to fair value of $8.1 million. The Company used a discounted cash flow approach to the project and the estimated cash to be distributed to the minority member of the entity, using a discount rate of 17.8%.
Schedule Of Reconciliation Of Enterprise Value To Reorganized Asset Value And Determination Of Goodwill	'
	Reconciliation of enterprise value to the reorganized value of the Company’s assets and determination of goodwill (in thousands):
	Total enterprise value		$	485,000
	Add: liabilities (excluding debt and equity)			87,765
	Add: noncontrolling interest			8,100
	Reorganization value of assets			580,865
	Fair value of assets (excluding goodwill)			566,656
	Reorganization value in excess of fair value (goodwill)		$	14,209

Reorganization_Items_Tables

Reorganization Items (Tables)	12 Months Ended
	Dec. 31, 2012
Summary Of Reorganization Items	'
	In accordance with authoritative accounting guidance issued by the FASB, separate disclosure is required for reorganization items, such as certain expenses, provisions for losses and other charges directly associated with or resulting from the reorganization and restructuring of the business, which have been realized or incurred during the Chapter 11 Cases. Reorganization items were comprised of the following (in thousands):
		Successor			Predecessor
		Period from			Period from
		February 25			January 1
		through			through
		December 31,			February 24,			Year Ended
		2012			2012			December 31,
								2011			2010
	Cancellation of debt	$	—		$	298,831		$	—		$	—
	Plan implementation and fresh start valuation adjustments		—			(49,302	)		—			—
	Professional fees		(2,525	)		(7,813	)		(21,182	)		—
	Write-off of Old Notes deferred loan costs		—			(8,258	)		—			—
	Total reorganization items, net	$	(2,525	)	$	233,458		$	(21,182	)	$	—

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended																	12 Months Ended
	Sep. 30, 2013																	Dec. 31, 2012
Segment Financial Information Relating to Operations	'																	'
	Segment financial information relating to the Company’s operations was as follows (in thousands):																	Segment financial information relating to the Company’s operations was as follows (in thousands):
			Successor												Predecessor					Successor			Predecessor
			Three			Three			Nine			Period from			Period from					Period from			Period from			Year Ended December 31,
			Months  Ended			Months  Ended			Months  Ended			February 25			January 1					25-Feb			1-Jan
			September 30,			September 30,			September 30,			through			through					through			through
			2013			2012			2013			September 30,			February  24,					December 31,			February 24,
												2012			2012					2012			2012			2011			2010
	Operating revenue:																	Operating revenue:
	Southern California		$	49,681		$	36,097		$	105,231		$	68,187		$	7,759		Southern California		$	116,619		$	7,759		$	130,737		$	206,241
	Northern California			27,790			26,181			56,115			131,747			11,014		Northern California			154,684			11,014			54,141			56,095
	Arizona			31,253			17,157			86,431			38,634			4,316		Arizona			58,714			4,316			20,074			16,595
	Nevada			23,920			13,552			56,421			24,007			2,481		Nevada			37,307			2,481			21,871			15,767
	Colorado			18,186			—			58,923			—			—		Colorado			5,436			—			—			—
	Total operating revenue		$	150,830		$	92,987		$	363,121		$	262,575		$	25,570		Total operating revenue		$	372,760		$	25,570		$	226,823		$	294,698
			Successor												Predecessor					Successor			Predecessor
			Three			Three			Nine			Period from			Period from					Period from			Period from			Year Ended December 31,
			Months  Ended			Months  Ended			Months  Ended			February 25			January 1					February 25			January 1
			September 30,			September 30,			September 30,			through			through					through			through
			2013			2012			2013			September 30,			February  24,					December 31,			February 24,
												2012			2012					2012			2012			2011			2010
	Net income (loss):																	(Loss) income before (provision) benefit from income taxes:
	Southern California		$	10,027		$	889		$	15,453		$	(1,840	)	$	(19,131	)	Southern California		$	3,345		$	(19,131	)	$	(26,406	)	$	(83,176	)
	Northern California			4,706			4,577			8,740			12,169			6,195		Northern California			16,179			6,195			(6,307	)		(41	)
	Arizona			4,224			353			9,032			64			9,928		Arizona			2,073			9,928			(95,184	)		(26,887	)
	Nevada			3,355			1			5,881			(1,637	)		(1,738	)	Nevada			(1,146	)		(1,738	)		(30,500	)		(21,449	)
	Colorado			209			—			1,654			—			—		Colorado			130			—			—			—
	Corporate (1)			(11,841	)		(5,354	)		(23,473	)		(14,329	)		233,243		Corporate			(27,431	)		233,243			(34,491	)		(4,314	)
	Net income (loss)		$	10,680		$	466		$	17,287		$	(5,573	)	$	228,497		(Loss) income before (provision)		$	(6,850	)	$	228,497		$	(192,888	)	$	(135,867	)
																		benefit from income taxes
Pretax Inventory Impairment Charges Included In (Loss) Income Before (Provision) Benefit From Income Taxes	'																	'
																		(Loss) income before (provision) benefit from income taxes includes the following pretax inventory impairment charges recorded in the following segments (in thousands):
																				Successor			Predecessor
																				Period from			Period from			Year Ended			Year Ended
																				February 25			January 1			December 31,			December 31,
																				through			through			2011			2010
																				December 31,			February 24,
																				2012			2012
																		Southern California		$	—		$	—		$	17,962		$	70,801
																		Northern California			—			—			2,074			3,103
																		Arizona			—			—			87,607			22,409
																		Nevada			—			—			20,671			15,547
																		Colorado			—			—			—			—
																		Total impairment loss on real estate assets		$	—		$	—		$	128,314		$	111,860
Consists Of Write-Off Of Land Option Deposits And Pre-Acquisition Costs	'																	'
																				Successor			Predecessor
																				December 31,
																				2012			2011
																		Homebuilding assets:
																		Southern California		$	195,688		$	182,781
																		Northern California			31,293			105,298
																		Arizona			173,847			129,920
																		Nevada			51,141			42,183
																		Colorado			37,668			—
																		Corporate (1)			91,510			36,769
																		Total homebuilding assets		$	581,147		$	496,951
																		-1	Comprised primarily of cash and cash equivalents, receivables, deferred loan costs, and other assets.
Segment Schedule of Homebuilding Assets	'																	'
			Successor
			September 30,			December 31,
			2013			2012
	Homebuilding assets:
	Southern California		$	281,967		$	195,688
	Northern California			130,616			31,293
	Arizona			169,581			173,847
	Nevada			76,353			51,141
	Colorado			36,769			37,668
	Corporate (2)			103,667			91,510
	Total homebuilding assets		$	798,953		$	581,147
	-1	Includes the Company’s consolidated Provision for income taxes of approximately $6.4 million and $6.4 million for the three and nine months ended September 30, 2013.
	-2	Comprised primarily of cash and cash equivalents, receivables, deferred loan costs, and other assets.

Real_Estate_Inventories_Tables

Real Estate Inventories (Tables)	9 Months Ended						12 Months Ended
	Sep. 30, 2013						Dec. 31, 2012
Schedule Of Inventory Table [Table Text Block]	'						'
	Real estate inventories consist of the following (in thousands):						Real estate inventories consist of the following (in thousands):
			Successor						Successor		Predecessor
			September 30,		December 31,				December 31,
			2013		2012				2012		2011
	Real estate inventories owned:						Real estate inventories owned:
	Land deposits		$	40,816	$	31,855	Land deposits		$	31,855	$	26,939
	Land and land under development			439,401		318,327	Land and land under development			318,327		267,348
	Homes completed and under construction			138,500		50,847	Homes completed and under construction			50,847		90,824
	Model homes			21,445		20,601	Model homes			20,601		13,423
	Total		$	640,162	$	421,630	Total		$	421,630	$	398,534
	Real estate inventories not owned: (1)						Real estate inventories not owned: (1)
	Other land options contracts — land banking arrangement		$	20,738	$	39,029	Other land options contracts — land banking arrangement		$	39,029	$	47,408
	-1	Represents the consolidation of a land banking arrangement. Although the Company is not obligated to purchase the lots, based on certain factors, the Company has determined that it is economically compelled to purchase the lots in the land banking arrangement. Amounts are net of deposits.					-1	Represents the consolidation of a land banking arrangement which does not obligate the Company to purchase the lots, however, based on certain factors, the Company has determined it is economically compelled to purchase the lots in the land banking arrangement, which has been consolidated. Amounts are net of deposits.

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2012
Schedule Of Goodwill	'
	Goodwill by operating segment as of December 31, 2012 and 2011 is as follows (in thousands):
		Successor		Predecessor
		December 31,
		2012		2011
	Southern California	$	4,885	$	—
	Northern California		1,916		—
	Arizona		5,951		—
	Nevada		1,457		—
	Colorado		—		—
	Total goodwill	$	14,209	$	—

Intangibles_Tables

Intangibles (Tables)	12 Months Ended
	Dec. 31, 2012
Carrying Value And Accumulated Amortization Of Intangible Assets	'
	The carrying value and accumulated amortization of intangible assets at December 31, 2012, by major intangible asset category, is as follows (in thousands):
		Successor
		December 31, 2012
		Carrying		Accumulated			Net
		Value		Amortization			Carrying
							Amount
	Construction management contracts	$	4,640	$	(1,295	)	$	3,345
	Homes in backlog		4,937		(4,169	)		768
	Joint venture management fee contracts		800		(293	)		507
	Total intangibles	$	10,377	$	(5,757	)	$	4,620
Estimated Future Amortization Expense	'
	Estimated future amortization expense related to intangible assets is as follows (in thousands):
		Total
		Amortization
	2013	$	1,725
	2014		1,244
	2015		1,651
	Total	$	4,620

Senior_Notes_and_Secured_Indeb1

Senior Notes and Secured Indebtedness (Tables)	9 Months Ended																			12 Months Ended
	Sep. 30, 2013																			Dec. 31, 2012
Details of Notes Payable and Senior Notes	'																			'
																				Notes payable consist of the following (in thousands):
		Successor
		September 30,			December 31,
		2013			2012																Successor			Predecessor
	Senior notes:																				December 31,
	8 1/2% Senior Notes due November 15, 2020	$	325,000		$	325,000															2012			2011
	Notes payable:																			Notes payable:
	Revolving lines of credit	$	—		$	—														Notes payable	$	13,248		$	74,009
	Construction notes payable		19,233			13,248
	Seller financing		16,238			—														Senior Notes:
																				8  1/2% Senior Notes due November 15, 2020		325,000			—
	Total notes payable	$	35,471		$	13,248														Senior Secured Term Loan due Janaury 31, 2015		—			206,000
																				7  5/8% Senior Notes due December 15, 2012		—			66,704
	Total senior notes and notes payable	$	360,471		$	338,248														10  3/4% Senior Notes due April 1, 2013		—			138,912
																				7  1/2% Senior Notes due February 15, 2014		—			77,867
																				Total Senior Notes		325,000			489,483
																				Total notes payable and Senior Notes	$	338,248		$	563,492
Maturities Of Notes Payable And Senior Notes	'																			'
	As of September 30, 2013, the maturities of the Notes payable and 8 1/2% Senior Notes are as follows (in thousands):																			The maturities of the Notes Payable and 8 ½ Senior Notes are as follows as of December 31, 2012 (in thousands):
	Year Ending December 31,																			Year Ended December 31,
	2013	$	—																	2013	$	—
	2014		1,762																	2014		—
	2015		14,476																	2015		13,248
	2016		19,233																	2016		—
	2017		—																	2017		—
	Thereafter		325,000																	Thereafter		325,000
		$	360,471																		$	338,248
Summary of Senior Notes Redemption Prices Percentage	'																			'
	On or after November 15, 2016, California Lyon may redeem all or a portion of the New Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of the principal amount) set forth below plus accrued and unpaid interest to the applicable redemption date, if redeemed during the 12-month period beginning on November 15 of the years indicated below:																			On or after November 15, 2016, California Lyon may redeem all or a portion of the New Notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of the principal amount) set forth below plus accrued and unpaid interest to the applicable redemption date, if redeemed during the 12-month period beginning on November 15 of the years indicated below:
	Year	Percentage																		Year	Percentage
	2016		104.25	%																2016		104.25	%
	2017		102.125	%																2017		102.125	%
	2018 and thereafter		100	%																2018 and thereafter		100	%
Principal Amounts Of Senior Notes Outstanding	'																			'
																				On December 31, 2011, the Senior Notes had the following principal amounts outstanding (in thousands):
																					December 31,
																					2011
																				7  5/8% Senior Notes due December 15, 2012	$	66,704
																				10  3/4% Senior Notes due April 1, 2013		138,912
																				7  1/2% Senior Notes due February 15, 2014		77,867
																					$	283,483
Condensed Consolidating Balance Sheet	'																			'
	CONDENSED CONSOLIDATING BALANCE SHEET																			CONSOLIDATING BALANCE SHEET
	(Unaudited)																			December 31, 2012 (Successor)
	September 30, 2013 (Successor)																			(in thousands)
	(in thousands)
																					Unconsolidated
		Unconsolidated																			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
		Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			ASSETS
	ASSETS																			Cash and cash equivalents	$	—		$	69,376		$	65		$	1,634		$	—		$	71,075
	Cash and cash equivalents	$	—		$	77,976		$	313		$	3,633		$	—		$	81,922		Restricted cash		—			853			—			—			—			853
	Restricted cash		—			853			—			—			—			853		Receivables		—			11,278			296			3,215			—			14,789
	Receivables		—			15,979			1,323			4,353			—			21,655		Real estate inventories
	Real estate inventories																			Owned		—			398,952			13			22,665			—			421,630
	Owned		—			574,987			1,839			63,336			—			640,162		Not owned		—			39,029			—			—			—			39,029
	Not owned		—			20,738			—			—			—			20,738		Deferred loan costs		—			7,036			—			—			—			7,036
	Deferred loan costs		—			8,088			—			—			—			8,088		Goodwill		—			14,209			—			—			—			14,209
	Goodwill		—			14,209			—			—			—			14,209		Intangibles		—			4,620			—			—			—			4,620
	Intangibles		—			3,446			—			—			—			3,446		Other assets		—			7,437			146			323			—			7,906
	Other assets		—			6,672			863			345			—			7,880		Investments in subsidiaries		62,712			22,148			—			—			(84,860	)		—
	Investments in subsidiaries		309,968			31,144			—			—			(341,112	)		—		Intercompany receivables		—			—			207,239			18,935			(226,174	)		—
	Intercompany receivables		—			—			220,142			18,865			(239,007	)		—
																				Total assets	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147
	Total assets	$	309,968		$	754,092		$	224,480		$	90,532		$	(580,119	)	$	798,953
	LIABILITIES AND EQUITY																			LIABILITIES AND EQUITY (DEFICIT)
	Accounts payable	$	—		$	16,185		$	1,005		$	2,210		$	—		$	19,400		Accounts payable	$	—		$	17,998		$	39		$	698		$	—		$	18,735
	Accrued expenses		—			59,535			777			79			—			60,391		Accrued expenses		—			41,505			213			52			—			41,770
	Liabilities from inventories not owned		—			20,738			—			—			—			20,738		Liabilities from inventories not owned		—			39,029			—			—			—			39,029
	Notes payable		—			14,476			1,762			19,233			—			35,471		Notes payable		—			7,809			—			5,439			—			13,248
	8  1/2% Senior Notes		—			325,000			—			—			—			325,000		8 1/2% Senior Notes		—			325,000			—			—			—			325,000
	Intercompany payables		—			229,125			—			9,881			(239,006	)		—		Intercompany payables		—			217,146			—			9,028			(226,174	)		—
	Total liabilities		—			665,059			3,544			31,403			(239,006	)		461,000		Total liabilities		—			648,487			252			15,217			(226,174	)		437,782
	Equity
	William Lyon Homes stockholders’ equity		309,968			89,033			220,936			31,144			(341,113	)		309,968		Redeemable convertible preferred stock		—			71,246			—			—			—			71,246
	Noncontrolling interest		—			—			—			27,985			—			27,985		Equity (deficit)
																				William Lyon Homes stockholders’ equity (deficit)		62,712			(144,795	)		207,507			22,148			(84,860	)		62,712
	Total liabilities and equity	$	309,968		$	754,092		$	224,480		$	90,532		$	(580,119	)	$	798,953		Noncontrolling interest		—			—			—			9,407			—			9,407
																				Total liabilities and equity (deficit)	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147
	CONDENSED CONSOLIDATING BALANCE SHEET
	December 31, 2012 (Successor)
	(in thousands)
																				CONSOLIDATING BALANCE SHEET
																				(DEBTOR-IN-POSSESSION)
		Unconsolidated																		December 31, 2011 (Predecessor)
		Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			(in thousands)
		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	ASSETS
	Cash and cash equivalents	$	—		$	69,376		$	65		$	1,634		$	—		$	71,075			Unconsolidated
	Restricted cash		—			853			—			—			—			853			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Receivables		—			11,278			296			3,215			—			14,789			Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	Real estate inventories																			ASSETS
	Owned		—			398,952			13			22,665			—			421,630		Cash and cash equivalents	$	—		$	14,333		$	47		$	5,681		$	—		$	20,061
	Not owned		—			39,029			—			—			—			39,029		Restricted cash		—			852			—			—			—			852
	Deferred loan costs		—			7,036			—			—			—			7,036		Receivables		—			9,897			310			3,525			—			13,732
	Goodwill		—			14,209			—			—			—			14,209		Real estate inventories
	Intangibles		—			4,620			—			—			—			4,620		Owned		—			278,939			—			119,595			—			398,534
	Other assets		—			7,437			146			323			—			7,906		Not owned		—			47,408			—			—			—			47,408
	Investments in subsidiaries		62,712			22,148			—			—			(84,860	)		—		Deferred loan costs, net		—			8,810			—			—			—			8,810
	Intercompany receivables		—			—			207,239			18,935			(226,174	)		—		Other assets, net		—			6,671			159			724			—			7,554
																				Investments in subsidiaries		(179,516	)		(85,714	)		—			—			265,230			—
	Total assets	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147		Intercompany receivables		—			—			203,517			12			(203,529	)		—
	LIABILITIES AND EQUITY (DEFICIT)																			Total assets	$	(179,516	)	$	281,196		$	204,033		$	129,537		$	61,701		$	496,951
	Accounts payable	$	—		$	17,998		$	39		$	698		$	—		$	18,735
	Accrued expenses		—			41,505			213			52			—			41,770		LIABILITIES AND (DEFICIT) EQUITY
Liabilities from inventories not owned		—			39,029			—			—			—			39,029		Liabilities not subject to compromise
Notes payable		—			7,809			—			5,439			—			13,248		Accounts payable	$	—		$	1,436		$	—		$	—		$	—		$	1,436
8  1/2% Senior Notes		—			325,000			—			—			—			325,000		Accrued expenses		—			2,082			—			—			—			2,082
Intercompany payables		—			217,146			—			9,028			(226,174	)		—		Liabilities from inventories not owned		—			47,408			—			—			—			47,408
																			Notes payable		—			3,010			—			70,999			—			74,009
Total liabilities		—			648,487			252			15,217			(226,174	)		437,782		Senior Secured Term Loan		—			206,000			—			—			—			206,000
Redeemable convertible preferred stock		—			71,246			—			—			—			71,246		Intercompany payables		—			71,459			—			132,070			(203,529	)		—
Equity (deficit)
William Lyon Homes stockholders’ equity (deficit)		62,712			(144,795	)		207,507			22,148			(84,860	)		62,712				—			331,395			—			203,069			(203,529	)		330,935
Noncontrolling interest		—			—			—			9,407			—			9,407		Liabilities subject to compromise
																			Accounts payable		—			2,560			38			1,348			—			3,946
Total liabilities and equity (deficit)	$	62,712		$	574,938		$	207,759		$	46,772		$	(311,034	)	$	581,147		Accrued expenses		—			47,051			218			1,188			—			48,457
																			7 5/8% Senior Notes		—			66,704			—			—			—			66,704
																			10 3/4% Senior Notes		—			138,912			—			—			—			138,912
																			7 1/2% Senior Notes		—			77,867			—			—			—			77,867
																					—			333,094			256			2,536			—			335,886
																			Total liabilities		—			664,489			256			205,605			(203,529	)		666,821
																			(Deficit) equity
																			William Lyon Homes stockholders’ (deficit) equity		(179,516	)		(383,293	)		203,777			(85,714	)		265,230			(179,516	)
																			Noncontrolling interest		—			—			—			9,646			—			9,646
																			Total liabilities and (deficit) equity	$	(179,516	)	$	281,196		$	204,033		$	129,537		$	61,701		$	496,951
Condensed Consolidating Statement of Operations	'																			'
	CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			CONSOLIDATING STATEMENT OF OPERATIONS
	(Unaudited)																			Period from February 25, 2012 through
	Three Months Ended September 30, 2013 (Successor)																			December 31, 2012 (Successor)
	(in thousands)																			(in thousands)
		Unconsolidated																			Unconsolidated
		Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	Operating revenue																			Operating revenue
	Sales	$	—		$	76,178		$	48,487		$	16,687		$	—		$	141,352		Sales	$	—		$	198,108		$	47,989		$	102,838		$	—		$	348,935
	Construction services		—			9,478			—			—			—			9,478		Construction services		—			23,825			—			—			—			23,825
	Management fees		—			456			—			—			(456	)		—		Management fees		—			534			—			—			(534	)		—
			—			86,112			48,487			16,687			(456	)		150,830				—			222,467			47,989			102,838			(534	)		372,760
	Operating costs																			Operating costs
	Cost of sales		—			(55,968	)		(40,519	)		(11,926	)		456			(107,957	)	Cost of sales		—			(163,083	)		(41,516	)		(93,924	)		534			(297,989	)
	Construction services		—			(8,135	)		—			—			—			(8,135	)	Construction services		—			(21,416	)		—			—			—			(21,416	)
	Sales and marketing		—			(4,108	)		(2,256	)		(315	)		—			(6,679	)	Sales and marketing		—			(10,705	)		(2,617	)		(606	)		—			(13,928	)
	General and administrative		—			(9,473	)		(726	)		(1	)		—			(10,200	)	General and administrative		—			(25,872	)		(221	)		(2	)		—			(26,095	)
	Amortization of intangible assets		—			(191	)		—			—			—			(191	)	Amortization of intangible assets		—			(5,757	)		—			—			—			(5,757	)
	Other		—			(695	)		—			—			—			(695	)	Other		—			(3,027	)		(2	)		120			—			(2,909	)
			—			(78,570	)		(43,501	)		(12,242	)		456			(133,857	)			—			(229,860	)		(44,356	)		(94,412	)		534			(368,094	)
	Income from subsidiaries		12,716			5,804			—			—			(18,520	)		—
																				(Loss) income from subsidiaries		(8,859	)		11,681			—			—			(2,822	)		—
	Operating income		12,716			13,346			4,986			4,445			(18,520	)		16,973
	Interest expense, net of amounts capitalized		—			(51	)		—			—			—			(51	)	Operating (loss) income		(8,859	)		4,288			3,633			8,426			(2,822	)		4,666
	Other income (expense), net		—			423			(9	)		(300	)		—			114		Loss on extinguishment of debt		—			(1,392	)		—			—			—			(1,392	)
																				Interest expense, net of amounts capitalized		—			(9,227	)		—			100			—			(9,127	)
	Income before provision for income taxes		12,716			13,718			4,977			4,145			(18,520	)		17,036		Other income (expense), net		—			618			(61	)		971			—			1,528
	Provision for income taxes		—			(6,356	)		—			—			—			(6,356	)
																				(Loss) income before reorganization items and provision for income taxes		(8,859	)		(5,713	)		3,572			9,497			(2,822	)		(4,325	)
	Net income		12,716			7,362			4,977			4,145			(18,520	)		10,680		Reorganization items, net		—			(3,073	)		1			547			—			(2,525	)
	Less: Net income attributable to noncontrolling interest		—			—			—			(3,118	)		—			(3,118	)
																				(Loss) income before provision for income taxes		(8,859	)		(8,786	)		3,573			10,044			(2,822	)		(6,850	)
	Net income attributable to William Lyon Homes		12,716			7,362			4,977			1,027			(18,520	)		7,562		Provision for income taxes		—			(11	)		—			—			—			(11	)
	Preferred stock dividends		—			—			—			—			—			—
																				Net (loss) income		(8,859	)		(8,797	)		3,573			10,044			(2,822	)		(6,861	)
	Net income available to common stockholders	$	12,716		$	7,362		$	4,977		$	1,027		$	(18,520	)	$	7,562		Less: Net income attributable to noncontrolling interest		—			—			—			(1,998	)		—			(1,998	)
																				Net (loss) income attributable to William Lyon Homes		(8,859	)		(8,797	)		3,573			8,046			(2,822	)		(8,859	)
	CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			Preferred stock dividends		(2,743	)		—			—			—			—			(2,743	)
	(Unaudited)
	Three Months Ended September 30, 2012 (Successor)																			Net (loss) income available to common stockholders	$	(11,602	)	$	(8,797	)	$	3,573		$	8,046		$	(2,822	)	$	(11,602	)
	(in thousands)
		Unconsolidated																		CONSOLIDATING STATEMENT OF OPERATIONS
		Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			Period from January 1, 2012 through
		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			February 24, 2012 (Predecessor)
	Operating revenue																			(in thousands)
	Sales	$	—		$	68,008		$	10,629		$	7,305		$	—		$	85,942
	Construction services		—			7,045			—			—			—			7,045
	Management fees		—			278			—			—			(278	)		—			Unconsolidated
																					Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
			—			75,331			10,629			7,305			(278	)		92,987			Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
																				Operating revenue
	Operating costs																			Home sales	$	—		$	10,024		$	4,316		$	2,347		$	—		$	16,687
	Cost of sales		—			(57,050	)		(8,912	)		(5,111	)		278			(70,795	)	Construction services		—			8,883			—			—			—			8,883
	Construction services		—			(6,410	)		—			—			—			(6,410	)	Management fees		—			110			—			—			(110	)		—
	Sales and marketing		—			(3,219	)		(643	)		(310	)		—			(4,172	)
	General and administrative		—			(5,368	)		(70	)		(2	)		—			(5,440	)			—			19,017			4,316			2,347			(110	)		25,570
	Amortization of intangible assets					(1,640	)											(1,640	)
	Other		—			(588	)		—			(357	)		—			(945	)	Operating costs
																				Cost of sales — homes		—			(8,819	)		(3,820	)		(2,069	)		110			(14,598	)
			—			(74,275	)		(9,625	)		(5,780	)		278			(89,402	)	Construction services		—			(8,223	)		—			—			—			(8,223	)
	(Loss) income from subsidiaries		(752	)		1,158			—			—			(406	)		—		Sales and marketing		—			(1,496	)		(260	)		(188	)		—			(1,944	)
																				General and administrative		—			(3,246	)		(56	)		—			—			(3,302	)
	Operating (loss) income		(752	)		2,214			1,004			1,525			(406	)		3,585		Other		—			(16	)		—			(171	)		—			(187	)
Interest expense, net of amounts capitalized		—			(2,350	)		—			(141	)		—			(2,491	)
Other income (expense), net		—			160			(53	)		(12	)		—			95				—			(21,800	)		(4,136	)		(2,428	)		110			(28,254	)
(Loss) income before reorganization items and provision for income taxes		(752	)		24			951			1,372			(406	)		1,189		Income from subsidiaries		228,383			11,536			—			—			(239,919	)		—
Reorganization items, net		—			(712	)		—			—			—			(712	)
																			Operating income (loss)		228,383			8,753			180			(81	)		(239,919	)		(2,684	)
(Loss) income before provision for income taxes		(752	)		(688	)		951			1,372			(406	)		477		Interest expense, net of amounts capitalized		—			(2,407	)		—			(100	)		—			(2,507	)
Provision for income taxes		—			(11	)		—			—			—			(11	)	Other income (expense), net		—			266			(25	)		(11	)		—			230
Net (loss) income		(752	)		(699	)		951			1,372			(406	)		466		Income (loss) before reorganization items and provision for income taxes		228,383			6,612			155			(192	)		(239,919	)		(4,961	)
Less: Net income attributable to noncontrolling interest		—						—			(1,218	)		—			(1,218	)	Reorganization items		—			221,796			(1	)		11,663			—			233,458
Net (loss) income attributable to William Lyon Homes		(752	)		(699	)		951			154			(406	)		(752	)	Income before provision for income taxes		228,383			228,408			154			11,471			(239,919	)		228,497
Preferred stock dividends		(755	)		—			—			—			—			(755	)	Provision for income taxes		—			—			—			—			—			—
Net (loss) income available to common stockholders	$	(1,507	)	$	(699	)	$	951		$	154		$	(406	)	$	(1,507	)	Net income		228,383			228,408			154			11,471			(239,919	)		228,497
																			Less: Net income attributable to noncontrolling interest		—			—			—			(114	)		—			(114	)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS																			Net income attributable to William Lyon Homes	$	228,383		$	228,408		$	154		$	11,357		$	(239,919	)	$	228,383
(Unaudited)
Nine Months Ended September 30, 2013 (Successor)
(in thousands)																			CONSOLIDATING STATEMENT OF OPERATIONS
																			(DEBTOR-IN-POSSESSION)
																			Year Ended December 31, 2011 (Predecessor)
	Unconsolidated																		(in thousands)
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Operating revenue																				Unconsolidated
Sales	$	—		$	173,032		$	142,105		$	26,545		$	—		$	341,682			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Construction services		—			21,439			—			—			—			21,439			Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Management fees		—			(727	)		—			—			727			—		Operating revenue
																			Home sales	$	—		$	176,992		$	19,954		$	10,109		$	—		$	207,055
		—			193,744			142,105			26,545			727			363,121		Construction services		—			19,768			—			—			—			19,768
																			Management fees		—			468			—			—			(468	)		—
Operating costs
Cost of sales		—			(132,270	)		(119,051	)		(18,722	)		(727	)		(270,770	)			—			197,228			19,954			10,109			(468	)		226,823
Construction services		—			(17,472	)		—			—			—			(17,472	)
Sales and marketing		—			(9,826	)		(6,867	)		(789	)		—			(17,482	)	Operating costs
General and administrative		—			(26,162	)		(1,835	)		(19	)		—			(28,016	)	Cost of sales		—			(162,148	)		(18,225	)		(8,818	)		468			(188,723	)
Amortization of intangible assets		—			(1,173	)		—			—			—			(1,173	)	Impairment loss on real estate assets		—			(70,742	)		—			(57,572	)		—			(128,314	)
Other		—			(1,744	)		(2	)		—			—			(1,746	)	Construction services		—			(18,164	)		—			—			—			(18,164	)
																			Sales and marketing		—			(14,528	)		(1,318	)		(1,002	)		—			(16,848	)
		—			(188,647	)		(127,755	)		(19,530	)		(727	)		(336,659	)	General and administrative		—			(22,070	)		(340	)		(1	)		—			(22,411	)
Income from subsidiaries		17,562			13,800			—			—			(31,362	)		—		Other		—			(2,979	)		—			(1,004	)		—			(3,983	)
Operating income		17,562			18,897			14,350			7,015			(31,362	)		26,462				—			(290,631	)		(19,883	)		(68,397	)		468			(378,443	)
Interest expense, net of amounts capitalized		—			(2,476	)		(126	)		—			—			(2,602	)
Other income (expense), net		—			1,184			(20	)		(907	)		—			257		Equity in income of unconsolidated joint ventures		—			3,605			—			—			—			3,605
																			Loss from subsidiaries		(193,330	)		(59,588	)		—			—			252,918			—
Income before reorganization items and provision for income taxes		17,562			17,605			14,204			6,108			(31,362	)		24,117
Reorganization items, net		—			(464	)		—			—			—			(464	)	Operating (loss) income		(193,330	)		(149,386	)		71			(58,288	)		252,918			(148,015	)
																			Interest expense, net of amounts capitalized		—			(23,639	)		—			(890	)		—			(24,529	)
Income before provision for income taxes		17,562			17,141			14,204			6,108			(31,362	)		23,653		Other income (expense), net		—			1,018			(131	)		(49	)		—			838
Provision for income taxes		—			(6,366	)		—			—			—			(6,366	)
																			Loss before reorganization items and provision for income taxes		(193,330	)		(172,007	)		(60	)		(59,227	)		252,918			(171,706	)
Net income		17,562			10,775			14,204			6,108			(31,362	)		17,287		Reorganization items		—			(21,182	)		—			—			—			(21,182	)
Less: Net income attributable to noncontrolling interest		—			—			—			(4,879	)		—			(4,879	)
																			Loss before provision for income taxes		(193,330	)		(193,189	)		(60	)		(59,227	)		252,918			(192,888	)
Net income attributable to William Lyon Homes		17,562			10,775			14,204			1,229			(31,362	)		12,408		Provision for income taxes		—			(10	)		—			—			—			(10	)
Preferred stock dividends		(1,528	)		—			—			—			—			(1,528	)
																			Net loss		(193,330	)		(193,199	)		(60	)		(59,227	)		252,918			(192,898	)
Net income available to common stockholders	$	16,034		$	10,775		$	14,204		$	1,229		$	(31,362	)	$	10,880		Less: Net income attributable to noncontrolling interest		—			—			—			(432	)		—			(432	)
																			Net loss attributable to William Lyon Homes	$	(193,330	)	$	(193,199	)	$	(60	)	$	(59,659	)	$	252,918		$	(193,330	)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
(Unaudited)
Period from February 25, 2012 through																			CONSOLIDATING STATEMENT OF OPERATIONS
September 30, 2012 (Successor)																			Year Ended December 31, 2010 (Predecessor)
(in thousands)																			(in thousands)
	Unconsolidated																			Unconsolidated
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Operating revenue																			Operating revenue
Sales	$	—		$	111,159		$	32,105		$	102,838		$	—		$	246,102		Sales	$	—		$	263,864		$	16,595		$	3,610		$	—		$	284,069
Construction services		—			16,473			—			—			—			16,473		Construction services		—			10,629			—			—			—			10,629
Management fees		—			534			—			—			(534	)		—		Management fees		—			165			—			—			(165	)		—
		—			128,166			32,105			102,838			(534	)		262,575				—			274,658			16,595			3,610			(165	)		294,698
Operating costs																			Operating costs																	—
Cost of sales		—			(94,003	)		(27,737	)		(93,924	)		534			(215,130	)	Cost of sales		—			(228,542	)		(16,167	)		(1,633	)		165			(246,177	)
Construction services		—			(15,061	)		—			—			—			(15,061	)	Impairment loss on real estate assets		—			(111,860	)		—			—			—			(111,860	)
Sales and marketing		—			(6,493	)		(1,679	)		(663	)		—			(8,835	)	Construction services		—			(7,805	)		—			—			—			(7,805	)
General and administrative		—			(13,733	)		(186	)		(6	)		—			(13,925	)	Sales and marketing		—			(17,953	)		(1,208	)		(585	)		—			(19,746	)
Amortization of intangible assets		—			(5,034	)		—			—			—			(5,034	)	General and administrative		—			(24,795	)		(313	)		(21	)		—			(25,129	)
Other		—			(1,713	)		(2	)		(687	)		—			(2,402	)	Other		—			(2,740	)		—			—			—			(2,740	)
		—			(136,037	)		(29,604	)		(95,280	)		534			(260,387	)			—			(393,695	)		(17,688	)		(2,239	)		165			(413,457	)
(Loss) income from subsidiaries		(7,611	)		8,620			—			—			(1,009	)		—
																			Equity in income of unconsolidated joint ventures		—			916			—			—			—			916
Operating (loss) income		(7,611	)		749			2,501			7,558			(1,009	)		2,188		(Loss) income from subsidiaries		(136,786	)		(1,053	)		12			—			137,827			—
Interest expense, net of amounts capitalized		—			(6,970	)		—			(357	)		—			(7,327	)
Other income, net		—			562			(45	)		954			—			1,471		Operating (loss) income		(136,786	)		(119,174	)		(1,081	)		1,371			137,827			(117,843	)
																			Gain on extinguishment of debt		—			5,572			—			—			—			5,572
(Loss) income before reorganization items and provision for income taxes		(7,611	)		(5,659	)		2,456			8,155			(1,009	)		(3,668	)	Interest expense, net of amounts capitalized		—			(23,653	)		—			—			—			(23,653	)
Reorganization items, net		—			(1,895	)		1			—			—			(1,894	)	Other income (expense), net		—			280			(235	)		12			—			57
(Loss) income before provision for income taxes		(7,611	)		(7,554	)		2,457			8,155			(1,009	)		(5,562	)	(Loss) income before benefit from income taxes		(136,786	)		(136,975	)		(1,316	)		1,383			137,827			(135,867	)
Provision for income taxes		—			(11	)		—			—			—			(11	)	Benefit from income taxes		—			412			—			—			—			412
Net (loss) income		(7,611	)		(7,565	)		2,457			8,155			(1,009	)		(5,573	)	Net (loss) income		(136,786	)		(136,563	)		(1,316	)		1,383			137,827			(135,455	)
Less: Net income attributable to noncontrolling interest		—			—			—			(2,038	)		—			(2,038	)	Less: Net income attributable to noncontrolling interest		—			—			—			(1,331	)		—			(1,331	)
Net (loss) income attributable to William Lyon Homes		(7,611	)		(7,565	)		2,457			6,117			(1,009	)		(7,611	)	Net (loss) income attributable to William Lyon Homes	$	(136,786	)	$	(136,563	)	$	(1,316	)	$	52		$	137,827		$	(136,786	)
Preferred stock dividends		(1,798	)		—			—			—			—			(1,798	)
Net (loss) income available to common stockholders	$	(9,409	)	$	(7,565	)	$	2,457		$	6,117		$	(1,009	)	$	(9,409	)
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS
(Unaudited)
Period from January 1, 2012 through
February 24, 2012 (Predecessor)
(in thousands)
	Unconsolidated
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
Operating revenue
Home sales	$	—		$	10,024		$	4,316		$	2,347		$	—		$	16,687
Construction services		—			8,883			—			—			—			8,883
Management fees		—			110			—			—			(110	)		—
		—			19,017			4,316			2,347			(110	)		25,570
Operating costs
Cost of sales — homes		—			(8,819	)		(3,820	)		(2,069	)		110			(14,598	)
Construction services		—			(8,223	)		—			—			—			(8,223	)
Sales and marketing		—			(1,496	)		(260	)		(188	)		—			(1,944	)
General and administrative		—			(3,246	)		(56	)		—			—			(3,302	)
Other		—			(16	)		—			(171	)		—			(187	)
		—			(21,800	)		(4,136	)		(2,428	)		110			(28,254	)
Income from subsidiaries		228,383			11,536			—			—			(239,919	)		—
Operating income (loss)		228,383			8,753			180			(81	)		(239,919	)		(2,684	)
Interest expense, net of amounts capitalized		—			(2,407	)		—			(100	)		—			(2,507	)
Other income (expense), net		—			266			(25	)		(11	)		—			230
Income (loss) before reorganization items and provision for income taxes		228,383			6,612			155			(192	)		(239,919	)		(4,961	)
Reorganization items, net		—			221,796			(1	)		11,663			—			233,458
Net income		228,383			228,408			154			11,471			(239,919	)		228,497
Less: Net income attributable to noncontrolling interest		—			—			—			(114	)		—			(114	)
Net income attributable to William Lyon Homes	$	228,383		$	228,408		$	154		$	11,357		$	(239,919	)	$	228,383
Condensed Consolidating Statement of Cash Flows	'																			'
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																			CONSOLIDATING STATEMENT OF CASH FLOWS
	(Unaudited)																			Period from February 25, 2012 through
	Nine Months Ended September 30, 2013 (Successor)																			December 31, 2012 (Successor)
	(in thousands)																			(in thousands)
		Unconsolidated																			Unconsolidated
		Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	Operating activities																			Operating activities
	Net cash (used in) provided by operating activities	$	—		$	(142,959	)	$	12,221		$	(34,181	)	$	—		$	(164,919	)	Net cash (used in) provided by operating activities	$	—		$	(72,014	)	$	3,579		$	118,428		$	—		$	49,993
	Investing activities																			Investing activities
	Purchases of property and equipment		—			(3,299	)		(57	)		(3	)		—			(3,359	)	Cash paid for acquisitions, net		—			(33,201	)		—			—			—			(33,201	)
	Investments in subsidiaries		—			4,804			—			—			(4,804	)		—		Purchases of property and equipment		—			(271	)		(20	)		(21	)		—			(312	)
																				Investments in subsidiaries		—			(84,828	)		—			—			84,828			—
	Net cash provided by(used in) investing activities		—			1,505			(57	)		(3	)		(4,804	)		(3,359	)
																				Net cash used in investing activities		—			(118,300	)		(20	)		(21	)		84,828			(33,513	)
	Financing activities
	Proceeds from borrowings on notes payable		—			16,790			1,762			32,892			—			51,444		Financing activities
	Principal payments on notes payable		—			(26,360	)		—			(19,099	)		—			(45,459	)	Proceeds from borrowings on notes payable		—			7,809			—			5,439			—			13,248
	Payment of deferred loan costs		—			(1,792	)		—			—			—			(1,792	)	Proceeds from issurance of 8 1/2% Senior Notes		—			325,000			—			—			—			325,000
	Proceeds from issuance of common stock		—			179,438			—			—			—			179,438		Principal payments on notes payable		—			(3,994	)		—			(69,682	)		—			(73,676	)
	Offering costs related to issuance of common stock		—			(15,655	)		—			—			—			(15,655	)	Principal payments on Senior Secured Term Loan		—			(235,000	)		—			—			—			(235,000	)
	Payment of preferred stock dividends		—			(2,550	)		—			—			—			(2,550	)	Principal payments on Senior Subordinated Secured Notes		—			(75,916	)		—			—			—			(75,916	)
	Noncontrolling interest contributions		—			—			—			35,399			—			35,399		Proceeds from issuance of convertible preferred stock		—			14,000			—			—			—			14,000
	Noncontrolling interest distributions		—			—			—			(21,700	)		—			(21,700	)	Proceeds from issuance of common stock		—			16,000			—			—			—			16,000
	Advances to affiliates		—			—			(776	)		7,768			(6,992	)		—		Payment of deferred loan costs		—			(7,181	)		—			—			—			(7,181	)
	Intercompany receivables/payables		—			183			(12,902	)		923			11,796			—		Payment of preferred stock dividends		—			(1,721	)		—			—			—			(1,721	)
																				Noncontrolling interest contributions		—			—			—			15,313			—			15,313
	Net cash provided by (used in) financing activities		—			150,054			(11,916	)		36,183			4,804			179,125		Noncontrolling interest distributions		—			—			—			(16,004	)		—			(16,004	)
																				Advances to affiliates		—			—			3			78,817			(78,820	)		—
	Net increase in cash and cash equivalents		—			8,600			248			1,999			—			10,847		Intercompany receivables/payables		—			144,535			(3,549	)		(134,978	)		(6,008	)		—
	Cash and cash equivalents at beginning of period		—			69,376			65			1,634			—			71,075
																				Net cash provided (used in) by financing activities		—			183,532			(3,546	)		(121,095	)		(84,828	)		(25,937	)
	Cash and cash equivalents at end of period	$	—		$	77,976		$	313		$	3,633		$	—		$	81,922
																				Net (decrease) increase in cash and cash equivalents		—			(6,782	)		13			(2,688	)		—			(9,457	)
																				Cash and cash equivalents at beginning of period		—			76,158			52			4,322			—			80,532
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	(Unaudited)																			Cash and cash equivalents at end of period	$	—		$	69,376		$	65		$	1,634		$	—		$	71,075
	Period from February 25, 2012 through
	September 30, 2012 (Successor)
	(in thousands)																			CONSOLIDATING STATEMENT OF CASH FLOWS
																				Period from January 1, 2012 through
																				February 24, 2012 (Predecessor)
		Unconsolidated																		(in thousands)
		Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
		Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	Operating activities																				Unconsolidated
	Net cash (used in) provided by operating activities	$	—		$	(14,494	)	$	2,546		$	67,937		$	—		$	55,989			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
																					Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
	Investing activities																			Operating activities
	Purchases of property and equipment		—			(24	)		(13	)		(16	)		—			(53	)	Net cash (used in) provided by operating activities	$	—		$	(13,638	)	$	181		$	(3,864	)	$	—		$	(17,321	)
	Investments in subsidiaries		—			(3,837	)		—			—			3,837			—
																				Investing activities
	Net cash (used in) provided by investing activities		—			(3,861	)		(13	)		(16	)		3,837			(53	)	Purchases of property and equipment		—			(419	)		(3	)		422			—			—
																				Investments in subsidiaries		—			183			—			—			(183	)		—
	Financing activities
	Payment of preferred stock dividends		—			(1,114	)		—			—			—			(1,114	)	Net cash (used in) provided by investing activities		—			(236	)		(3	)		422			(183	)		—
	Principal payments on notes payable		—			(4,157	)		—			(58,400	)		—			(62,557	)
	Noncontrolling interest contributions		—			—			—			17,021			—			17,021		Financing activities
	Noncontrolling interest distributions		—			—			—			(15,373	)		—			(15,373	)	Principal payments on notes payable		—			(116	)		—			(500	)		—			(616	)
	Advances to affiliates		—			—			1			(3,306	)		3,305			—		Proceeds from reorganization		—			30,971			—			—			—			30,971
	Intercompany receivables/payables		—			19,087			(2,530	)		(9,415	)		(7,142	)		—		Proceeds from issuance of convertible preferred stock		—			50,000			—			—			—			50,000
																				Proceeds from debtor in possession financing		—			5,000			—			—			—			5,000
	Net cash provided by (used in) financing activities		—			13,816			(2,529	)		(69,473	)		(3,837	)		(62,023	)	Principal payment of debtor in possession financing		—			(5,000	)		—			—			—			(5,000	)
																			Payment of deferred loan costs		—			(2,491	)		—			—			—			(2,491	)
Net (decrease) increase in cash and cash equivalents		—			(4,539	)		4			(1,552	)		—			(6,087	)	Noncontrolling interest contributions		—			—			—			1,825			—			1,825
Cash and cash equivalents at beginning of period		—			76,158			52			4,322			—			80,532		Noncontrolling interest distributions		—			—			—			(1,897	)		—			(1,897	)
																			Advances to affiliates		—			—			—			(4	)		4			—
Cash and cash equivalents at end of period	$	—		$	71,619		$	56		$	2,770		$	—		$	74,445		Intercompany receivables/payables		—			(2,665	)		(173	)		2,659			179			—
																			Net cash provided by (used in) financing activities		—			75,699			(173	)		2,083			183			77,792
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
(Unaudited)																			Net increase (decrease) in cash and cash equivalents		—			61,825			5			(1,359	)		—			60,471
Period from January 1, 2012 through																			Cash and cash equivalents at beginning of period		—			14,333			47			5,681			—			20,061
February 24, 2012 (Predecessor)
(in thousands)																			Cash and cash equivalents at end of period	$	—		$	76,158		$	52		$	4,322		$	—		$	80,532
	Unconsolidated																		CONSOLIDATING STATEMENT OF CASH FLOWS
	Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated			(DEBTOR-IN-POSSESSION)
	Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company			Year Ended December, 2011 (Predecessor)
Operating activities																			(in thousands)
Net cash (used in) provided by operating activities	$	—		$	(13,638	)	$	181		$	(3,864	)	$	—		$	(17,321	)
Investing activities																				Unconsolidated
Purchases of property and equipment		—			(419	)		(3	)		422			—			—			Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
Investments in subsidiaries		—			183			—			—			(183	)		—			Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
																			Operating activities
Net cash (used in) provided by investing activities		—			(236	)		(3	)		422			(183	)		—		Net cash provided by (used in) operating activities	$	—		$	127,757		$	87		$	(166,495	)	$	—		$	(38,651	)
Financing activities																			Investing activities
Principal payments on notes payable		—			(116	)		—			(500	)		—			(616	)	Distributions from unconsolidated joint ventures		—			1,435			—			—			—			1,435
Proceeds from reorganization		—			30,971			—			—			—			30,971		Purchases of property and equipment		—			725			(131	)		(722	)		—			(128	)
Proceeds from issuance of convertible preferred stock		—			50,000			—			—			—			50,000		Investments in subsidiaries		—			29,412			—			—			(29,412	)		—
Proceeds from debtor in possession financing		—			5,000			—			—			—			5,000
Principal payment of debtor in possession financing		—			(5,000	)		—			—			—			(5,000	)	Net cash provided by (used in) investing activities		—			31,572			(131	)		(722	)		(29,412	)		1,307
Payment of deferred loan costs		—			(2,491	)		—			—			—			(2,491	)
Noncontrolling interest contributions		—			—			—			1,825			—			1,825		Financing activities
Noncontrolling interest distributions		—			—			—			(1,897	)		—			(1,897	)	Principal payments on notes payable		—			(82,531	)		—			70,999			—			(11,532	)
Advances to affiliates		—			—			—			(4	)		4			—		Noncontrolling interest contributions		—			—			—			6,605			—			6,605
Intercompany receivables/payables		—			(2,665	)		(173	)		2,659			179			—		Noncontrolling interest distributions		—			—			—			(8,954	)		—			(8,954	)
																			Advances to affiliates		—			—			(3	)		(29,341	)		29,344			—
Net cash provided by (used in) financing activities		—			75,699			(173	)		2,083			183			77,792		Intercompany receivables/payables		—			(131,964	)		(37	)		131,933			68			—
Net increase (decrease) in cash and cash equivalents		—			61,825			5			(1,359	)		—			60,471		Net cash (used in) provided by financing activities		—			(214,495	)		(40	)		171,242			29,412			(13,881	)
Cash and cash equivalents at beginning of period		—			14,333			47			5,681			—			20,061
																			Net (decrease) increase in cash and cash equivalents		—			(55,166	)		(84	)		4,025			—			(51,225	)
Cash and cash equivalents at end of period	$	—		$	76,158		$	52		$	4,322		$	—		$	80,532		Cash and cash equivalents at beginning of period		—			69,499			131			1,656			—			71,286
																			Cash and cash equivalents at end of period	$	—		$	14,333		$	47		$	5,681		$	—		$	20,061
																			CONSOLIDATING STATEMENT OF CASH FLOWS
																			Year Ended December 30, 2010 (Predecessor)
																			(in thousands)
																				Unconsolidated
																				Delaware			California			Guarantor			Non-Guarantor			Eliminating			Consolidated
																				Lyon			Lyon			Subsidiaries			Subsidiaries			Entries			Company
																			Operating activities
																			Net cash provided by (used in) operating activities	$	—		$	27,863		$	(1,245	)	$	(2,499	)	$	—		$	24,119
																			Investing activities
																			Investment in and advances to unconsolidated joint ventures		—			(194	)		—			—			—			(194	)
																			Distributions from unconsolidated joint venture		—			4,183			—			—			—			4,183
																			Purchases of property and equipment		—			101			(165	)		—			—			(64	)
																			Investments in subsidiaries		—			(361	)		12			—			349			—
																			Net cash provided by (used in) investing activities		—			3,729			(153	)		—			349			3,925
																			Financing activities
																			Proceeds from borrowings on notes payable		—			7,087			—			—			—			7,087
																			Principal payments on notes payable		—			(52,797	)		—			—			—			(52,797	)
																			Net cash paid for repurchase of Senior Notes		—			(31,268	)		—			—			—			(31,268	)
																			Noncontrolling interest contributions		—			—			—			6,546			—			6,546
																			Noncontrolling interest distributions		—			—			—			(3,913	)		—			(3,913	)
																			Advances to affiliates		—			—			(19	)		(744	)		763			—
																			Intercompany receivables/payables		—			(362	)		1,437			37			(1,112	)		—
																			Net cash (used in) provided by financing activities		—			(77,340	)		1,418			1,926			(349	)		(74,345	)
																			Net (decrease) increase in cash and cash equivalents		—			(45,748	)		20			(573	)		—			(46,301	)
																			Cash and cash equivalents at beginning of period		—			115,247			111			2,229			—			117,587
																			Cash and cash equivalents at end of period	$	—		$	69,499		$	131		$	1,656		$	—		$	71,286

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended											12 Months Ended
	Sep. 30, 2013											Dec. 31, 2012
Estimated Fair Values of Financial Instruments	'											'
	The estimated fair values of financial instruments are as follows (in thousands):											The estimated fair values of financial instruments are as follows (in thousands):
			Successor											Successor								Predecessor
			September 30, 2013					December 31, 2012						December 31, 2012								December 31, 2011
			Carrying			Fair		Carrying		Fair				Carrying			Fair					Carrying		Fair
			Amount			Value		Amount		Value				Amount			Value					Amount		Value
	Financial liabilities:											Financial liabilities:
	8   1/2% Senior Notes due 2020		$	325,000		$	342,875	$	325,000	$	338,000	Notes payable		$	13,248		$	13,248				$	74,009	$	74,009
	Notes payable		$	35,471		$	35,471	$	13,248	$	13,248	8 1/2% Senior Notes due 2020		$	325,000		$	338,000				$	—	$	—
												Senior Secured Term Loan due 2015		$	—		$	—				$	206,000	$	235,000
												7 5/8% Senior Notes due 2012		$	—		$	—				$	66,704	$	20,469
												10 3/4% Senior Notes due 2013		$	—		$	—				$	138,912	$	40,614
												7 1/2% Senior Notes due 2014		$	—		$	—				$	77,867	$	21,742
Fair Value Of Debt	'											'
	The following table represents a reconciliation of the beginning and ending balance for the Company’s Level 3 fair value measurements:											The following table represents a reconciliation of the beginning and ending balance for the Company’s Level 3 fair value measurements:
			Notes														Senior
			Payable											Notes			Secured
			(in thousands)											Payable			Term Loan
	Fair value at December 31, 2012		$	13,248										(in thousands)
	Repayments of principal (1)			(45,459	)							Fair Value at December 31, 2011 (Predecessor)		$	74,009		$	235,000
	Borrowings of principal (2)			67,682								Change in balance related to plan of reorganization (1)			—			—
	Increase in value during the period			—								Repayments of principal (2)			(74,009	)		(235,000	)
												Borrowings of principal (3)			13,248			—
	Fair value at September 30, 2013		$	35,471								Increase in value during the period			—			—
												Fair Value at December 31, 2012 (Successor)		$	13,248		$	—
	-1	Represents the actual amount of principal repaid
	-2	Represents the actual amount of principal borrowed
												-1	Change is representative of payoff of the loan for the value reported at December 31, 2011, and not the face amount of the notes that were eliminated in accordance with the joint plan of reorganization.
												-2	Represents the actual amount of principal repaid
												-3	Represents the actual amount of principal borrowed
Summary Of Fair-Value Measurements Of Non-Financial Assets	'											'
												The following table summarizes the fair-value measurements of its non-financial assets for the year ended December 31, 2011:
														Fair Value			Fair Value at			Impairment
														Hierarchy			Measurement			Charges
																	Date(1)			for the Year Ended
																				December 31,
																				2011(1)
														(in thousands)
												Land under development and homes completed and under construction(2)			Level 3		$	94,751		$	34,835
												Inventory held for future development(3)			Level 3		$	74,146		$	93,479
												-1	Amounts represent the aggregate fair values for communities where the Company recognized noncash inventory impairment charges during the year ended December 31, 2011.
												-2	In accordance with FASB ASC 360-10-35, inventory under this caption with a carrying value of $129.6 million was written down to its fair value of $94.8 million, resulting in total impairments of $34.8 million for the year ended December 31, 2011.
												-3	In accordance with FASB ASC 360-10-35, inventory under this caption with a carrying value of $167.6 million was written down to its fair value of $74.1 million, resulting in total impairments of $93.5 million for the year ended December 31, 2011.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2012
Summary Of (Provision) Benefit From Income Taxes	'
	The following summarizes the (provision) benefit from income taxes (in thousands):
		Successor			Predecessor
		Period from			Period from				Year Ended
		February 25			1-Jan				December 31,
		through			through
		December 31,			February 24,
		2012			2012				2011				2010
	Current
	Interest on uncertain tax provisions	$	—		$	—			$	—			$	75
	Federal		—			—				—				347
	State		(11	)		—				(10	)			(10	)
		$	(11	)	$	—			$	(10	)		$	412
Difference In Income Taxes From Amounts Computed By Applying Federal Statutory Rates Recorded	'
	Income taxes differ from the amounts computed by applying the applicable federal statutory rates due to the following (in thousands):
		Successor					Predecessor
		Period from					Period from				Year Ended
		February 25					1-Jan				December 31,
		through					through
		December 31,					February 24,
		2012					2012				2011				2010
	Benefit (provision) for federal income taxes at the statuatory rate	$	3,098				$	(79,935	)		$	67,662			$	48,019
	Provision for state income taxes, net of federal income tax benefits		(7	)				—				(6	)			(6	)
	Valuation allowance		(2,195	)				(14,991	)			(66,265	)			(47,949	)
	Nondeductible items-reorganization costs		(709	)				94,925				(1,379	)			—
	Nondeductible items-other		(194	)				(3	)			(22	)			—
	Other		(4	)				4				—				348
		$	(11	)			$	—			$	(10	)		$	412
Summary Of Temporary Differences Giving Rise To Deferred Income Taxes	'
	Temporary differences giving rise to deferred income taxes consist of the following (in thousands):
		December 31,
		2012			2011
	Deferred tax assets
	Impairment and other reserves	$	73,947		$	102,216
	Compensation deductible for tax purposes when paid		987			970
	State income tax provisions deductible when paid for federal tax purposes		4			3
	Effect of book/tax differences for joint ventures		1,002			1,563
	Effect of book/tax differences for capitalized interest/general and administrative		—			891
	Other		318			318
	AMT credit carryover		2,698			2,698
	Unused recognized built-in loss		16,349			—
	Net operating loss		113,314			99,586
	Valuation allowance		(200,048	)		(202,322	)
			8,571			5,923
	Deferred tax liabilities
	Effect of book/tax differences for joint ventures		(5,597	)		(5,923	)
	Effect of book/tax differences for capitalized interest/general and administrative		(2,974	)		—
			(8,571	)		(5,923	)
		$	—		$	—

Business_Combination_Tables

Business Combination (Tables)	9 Months Ended									12 Months Ended
	Sep. 30, 2013									Dec. 31, 2012
Schedule Of Assets And Liabilities Acquired	'									'
	The assets and liabilities acquired through the purchase of Village Homes were as follows (in thousands):									The assets and liabilities acquired through the purchase of Village Homes were as follows (in thousands):
	Real estate inventories owned	$	32,923							Real estate inventories owned	$	32,923
	Other assets, net		1,463							Other assets, net		1,463
	Intangibles		907							Intangibles		907
	Receivables		70							Receivables		70
	Accounts payable		(1,029	)						Accounts payable		(1,029	)
	Accrued expenses		(1,133	)						Accrued expenses		(1,133	)
	Cash paid for acquisitions, net	$	33,201							Cash paid for acquisitions, net	$	33,201
Schedule of Unaudited Pro Forma Information Prepared to Give Effect to Acquisition	'									'
	For the three months ended September 30, 2012, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012, the below unaudited pro forma information has been prepared to give effect to the Village Homes acquisition as if it occurred on January 1, 2012 (in thousands except number of shares and per share data):									For the period from February 25, 2012 through December 31, 2012, period from January 1, 2012 through February 24, 2012, and the year ended December 31, 2011, the below unaudited pro forma information has been prepared to give effect to the Village Homes acquisition as if it occurred on January 1, 2011 (in thousands except number of shares and per share data):
		(unaudited)									(unaudited)
		Successor						Predecessor			Successor			Predecessor
		Three			Period from			Period from			Period from			Period from		Year Ended
		Months			February  25			January  1			February 25			January 1		December 31,
		Ended			through			through			through			through		2011
		September 30,			September  30,			February  24,			December 31,			February 24,
		2012			2012			2012			2012			2012
	Revenues	$	104,479		$	283,090		$	28,521	Revenue	$	405,635		$	28,521	$	261,933
	Net (loss) income available to common stockholders	$	(872	)	$	(9,267	)	$	227,912	Net (loss) income available to common stockholders	$	(9,617	)	$	228,074	$	(189,457	)
	(Loss) income per common share, basic and diluted	$	(0.07	)	$	(0.79	)	$	227,912	(Loss) income per common share, basic and diluted	$	(0.09	)	$	228,074	$	(189,457	)
	Weighted average common shares outstanding, basic and diluted		12,408,263			11,716,413			1,000	Weighted average common shares outstanding, basic and diluted		103,037,842			1,000		1,000

Loss_Income_Per_Common_Share_T

(Loss) Income Per Common Share (Tables)	9 Months Ended														12 Months Ended
	Sep. 30, 2013														Dec. 31, 2012
Basic And Diluted (Loss) Income Per Common Share	'														'
	Basic and diluted income (loss) per common share for the three months ended September 30, 2013 and 2012, the nine months ended September 30, 2013, the period from February 25, 2012 through September 30, 2012, and the period from January 1, 2012 through February 24, 2012 were calculated as follows (in thousands, except number of shares and per share amounts):														Basic and diluted (loss) income per common share for the period from February 25, 2012 through December 31, 2012, the period from January 1, 2012 through February 24, 2012 and the year ended December 31, 2011 and 2010 were calculated as follows (in thousands, except number of shares and per share amounts):
			Successor										Predecessor				Successor			Predecessor
			Three		Three			Nine		Nine			Period from				Period from			Period from		Year Ended
			Months Ended		Months  Ended			Months Ended		Months Ended			January 1				February 25			January 1		December 31,
			September 30,		September 30,			September  30,		September  30,			through				through			through
			2013		2012			2013		2012			February  24,				December 31,			February 24,
													2012				2012			2012		2011			2010
	Basic weighted average number of common shares outstanding			30,975,160		12,408,263			22,569,810		11,716,413			1,000	Basic weighted average number of shares outstanding			103,037,842			1,000		1,000			1,000
	Effect of dilutive securities:														Effect of dilutive securities:
	Stock options, unvested common shares, and warrants (1)			920,654		—			877,144		—			N/A	Preferred shares, stock options, and warrants (1)			—			N/A		N/A			N/A
	Diluted average shares outstanding			31,895,814		12,408,263			23,446,954		11,716,413			1,000	Diluted average shares outstanding			103,037,842			1,000		1,000			1,000
	Net income (loss) available to common stockholders		$	7,562	$	(1,507	)	$	10,880	$	(9,409	)	$	228,383	Net (loss) income available to common stockholders		$	(11,602	)	$	228,383	$	(193,330	)	$	(136,786	)
	Basic income (loss) per common share		$	0.24	$	(0.12	)	$	0.48	$	(0.80	)	$	228,383
	Dilutive income (loss) per common share		$	0.24	$	(0.12	)	$	0.46	$	(0.80	)	$	228,383	Basic (loss) income per common share		$	(0.11	)	$	228,383	$	(193,330	)	$	(136,786	)
	Antidilutive securities not included in the calculation of diluted income (loss) per common share (weighted average):														Dilutive (loss) income per common share		$	(0.11	)	$	228,383	$	(193,330	)	$	(136,786	)
	Preferred shares			N/A		7,858,404			N/A		7,858,404			N/A	Antidilutive securities not included in the calculation of diluted (loss) income per common share (weighted average):
	Warrants			N/A		1,907,551			N/A		1,907,551			N/A	Preferred shares			68,002,529			N/A		N/A			N/A
															Vested stock options			3,171,535			N/A		N/A			N/A
	-1	For periods with a net loss, all potentially dilutive shares related to the preferred shares, unvested common shares, and warrants were excluded from the diluted loss per common share calculations because the effect of their inclusion would be antidilutive, or would decrease the reported loss per common share.													Unvested stock options			1,585,767			N/A		N/A			N/A
															Warrants			15,737,294			N/A		N/A			N/A
															-1	For periods with a net loss, all potentially dilutive shares related to the preferred shares, options to acquire common stock, and warrants were excluded from the diluted loss per common share calculations because the effect of their inclusion would be antidilutive, or would decrease the reported loss per common share.

Stock_Based_Compensation_Table

Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Weighted-Average Assumptions For Fair Value Of Employee Options Granted

'

The fair value of each employee option awarded was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions.

Period from

February 25, 2012

through December 31,

2012

2011

2010

Expected dividend yield

0

%

N/A

N/A

Risk-free interest rate

0.55

%

N/A

N/A

Expected volatility

79

%

N/A

N/A

Expected life (in years)

4.73

N/A

N/A

Schedule Of Stock Option Activity

'

Stock option activity under the Plan at December 31, 2012 and changes during the period from February 25, 2012 through December 31, 2012 were as follows (there is no activity in prior periods as the options were granted in the fourth quarter of 2012):

Period from February 25, 2012 through

December 31, 2012

Options

Weighted

Weighted

Aggregate

Average

Average

Intrinsic

Exercise

Remaining

Value

Price

Contractual

Life (in years)

Options outstanding at beginning of year

—

N/A

N/A

N/A

Granted (1)

4,757,302

$

1.05

4.48

$

—

Exercised

—

N/A

N/A

N/A

Cancelled

—

N/A

N/A

N/A

Options outstanding at end of year

4,757,302

$

1.05

4.48

$

—

Options vested and expected to vest

4,757,302

$

1.05

4.48

$

—

Options exercisable at end of year (2)

3,171,535

$

1.05

4.48

$

—

Price range of options exercised

N/A

Price range of options outstanding

$

1.05

Total shares available for future grants at end of year

6,442,970

-1

The weighted average grant date fair value of the stock options was $0.64.

-2

The fair value of shares vested during the period from February 25, 2012 through December 31, 2012 was $2.0 million.

Summary Of Stock Options Granted To Executives, Directors, And Non-Executives That Are Vested And Expected To Vest In Periods

'

The following table summarizes information associated with stock options granted to executives, directors, and non-executives that are vested and expected to vest in future reporting periods:

Period from February 25, 2012 through

December 31, 2012

Number of

Weighted

Weighted

Aggregate

Shares

Average

Average

Intrinsic

Exercise

Remaining

Value

Price

Contractual

Life (in years)

Executives

4,467,892

$

1.05

Directors

—

N/A

Non-Executives

289,410

$

1.05

Total

4,757,302

$

1.05

4.48

$

—

Summary Of Stock Options Granted To Executives, Directors, And Non-Executives That Are Exercisable

'

The following table summarizes information associated with stock options granted to executives, directors, and non-executives that are exercisable at December 31, 2012:

Period from February 25, 2012 through

December 31, 2012

Number of

Weighted

Weighted

Aggregate

Shares

Average

Average

Intrinsic

Exercise

Remaining

Value

Price

Contractual

Life (in years)

Executives

2,978,595

$

1.05

Directors

—

N/A

Non-Executives

192,940

$

1.05

Total

3,171,535

$

1.05

4.48

$

—

Summary Of Nonvested (Restricted) Shares Activity

'

Summary of Nonvested (Restricted) Shares Activity

Period from February 25, 2012

through December 31, 2012

Number of

Weighted

Shares

Average Grant

Date Fair Value

Non-vested shares at beginning of year

—

N/A

Granted

2,499,293

$

1.05

Vested

1,592,965

$

1.05

Cancelled

—

$

1.05

Non-vested shares at end of year

906,328

$

1.05

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended					12 Months Ended
	Sep. 30, 2013					Dec. 31, 2012
Future Minimum Payments Under Non-Cancelable Operating Leases	'					'
	The table below shows the future minimum payments under non-cancelable operating leases at September 30, 2013 (in thousands).					The table below shows the future minimum payments under non-cancelable operating leases at December 31, 2012 (in thousands).
	Year Ending December 31					Year Ended December 31
	2013	$	370			2013		$	1,349
	2014		1,393			2014			1,260
	2015		731			2015			618
	2016		671			2016			556
	2017		697			2017			580
	Thereafter		2,734			Thereafter			2,654
	Total	$	6,596			Total		$	7,017
Summary of Company's Consolidated Land Banking Arrangement	'					'
	Summary information with respect to the Company’s land banking arrangements is as follows as of the periods presented (dollars in thousands):					Summary information with respect to the Company’s land banking arrangements is as follows as of the periods presented (dollars in thousands):
		Successor						Successor		Predecessor
		September 30,		December 31,				December 31,
		2013		2012				2012		2011
	Total number of land banking projects		1		1	Total number of land banking projects			1		1
	Total number of lots		610		610	Total number of lots (1)			610		625
	Total purchase price	$	161,465	$	161,465	Total purchase price		$	161,465	$	161,465
	Balance of lots still under option and not purchased:					Balance of lots still under option and not purchased:
	Number of lots		105		199	Number of lots			199		225
	Purchase price	$	20,738	$	39,029	Purchase price		$	39,029	$	47,408
	Forfeited deposits if lots are not purchased	$	14,737	$	27,734	Forfeited deposits if lots are not purchased		$	27,734	$	25,234
						-1	Total number of lots in the land banking project was reduced by 15 as of December 31, 2012 as compared to December 31, 2011 because of a change in product mix in future projects.

Subsequent_Events_Tables

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2012
Effect of Reverse Stock Split	'
	The tables below show the proforma effect of the 1-for-8.25 reverse stock split as of and for the Successor periods presented. The 1-for-8.25 reverse stock split should not be retroactively applied to the Predecessor periods as the Company’s reorganization was a recapitalization event, thus the Predecessor period is not meant to be comparable with the Successor period.
		December 31, 2012
		Before			After
		stock split			stock split
	William Lyon Homes shares outstanding
	Common stock, Class A		70,121,378			8,499,558
	Common stock, Class B		31,464,548			3,813,885
	Common stock, Class C		16,020,338			1,941,859
	Common stock, Class D		2,499,293			302,945
	Total number of shares outstanding		120,105,557			14,558,246
		Period from February 25
		through December 31, 2012
		Before			After
		stock split			stock split
	(Loss) income per common share, basic and diluted	$	(0.11	)	$	(0.93	)
	Weighted average common shares outstanding, basic and diluted		103,037,842			12,489,435

Unaudited_Summarized_Quarterly1

Unaudited Summarized Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2012
Summarized Unaudited Quarterly Financial Information	'
	Summarized unaudited quarterly financial information for the years ended December 31, 2012 and 2011 is as follows (in thousands except per share data):
		Predecessor					Successor
		Period from					Period from
		January 1					February 25
		through					through				Three Months Ended
		February  24,					March  31,				June 30,				September 30,			December 31,
		2012					2012				2012				2012			2012
	Sales	$	16,687				$	15,109			$	145,051			$	85,942		$	102,833
	Cost of sales		(14,598	)				(13,063	)			(131,272	)			(70,795	)		(82,859	)
	Gross profit		2,089					2,046				13,779				15,147			19,974
	Other income, costs and expenses, net		226,408					(7,028	)			(14,836	)			(14,681	)		(21,262	)
	Net income (loss)		228,497					(4,982	)			(1,057	)			466			(1,288	)
	Net income (loss) available to common stockholders	$	228,383				$	(5,351	)		$	(2,550	)		$	(1,507	)	$	(2,194	)
	Income (loss) per common share, basic and diluted	$	228,383				$	(0.06	)		$	(0.03	)		$	(0.01	)	$	(0.02	)
		Predecessor
		Three Months Ended
		March 31,			June 30,				September 30,				December 31,
		2011			2011				2011				2011
	Sales	$	36,574		$	57,795			$	53,703			$	58,983
	Cost of sales		(31,885	)		(51,121	)			(46,645	)			(59,072	)
	Gross profit (loss)		4,689			6,674				7,058				(89	)
	Other income, costs and expenses, net		(15,866	)		(17,759	)			(46,758	)			(130,837	)
	Net loss		(11,177	)		(11,095	)			(39,700	)			(130,926	)
	Net loss attributable to William Lyon Homes	$	(11,225	)	$	(11,171	)		$	(39,634	)		$	(131,300	)
	Loss per common share, basic and diluted	$	(11,225	)	$	(11,171	)		$	(39,634	)		$	(131,300	)

Basis_of_Presentation_and_Sign4

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)

1 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

21-May-13

Feb. 24, 2012

Sep. 30, 2013

31-May-13

Dec. 31, 2012

21-May-13

Feb. 24, 2012

Sep. 30, 2013

31-May-13

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

21-May-13

21-May-13

Sep. 30, 2013

Dec. 31, 2012

21-May-13

Sep. 30, 2013

Dec. 31, 2012

21-May-13

Y

Y

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Warrants [Member]

Parent [Member]

Sold by Company [Member]

Sold by selling stockholder [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Warrants [Member]

Warrants [Member]

Significant Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Real estate percentage of sales price maintained

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Real estate warranty period

'

1

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of service revenue

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.00%

3.00%

'

5.00%

5.00%

'

Common stock issued during period

92,400,000

'

'

10,005,000

44,793,255

44,793,255

'

'

'

31,464,548

'

'

'

'

'

7,177,500

2,827,500

'

'

'

'

'

'

Common stock, Initial Public Offering price per share

'

'

'

$25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds from issuance of common stock

'

'

'

$163,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized

'

190,000,000

'

'

'

150,000,000

'

'

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, par value

$0.01

'

'

'

$0.01

$0.01

'

$0.01

'

$0.01

$0.01

'

$0.01

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares authorized

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, par value

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders' equity reverse stock split

'

'

'

'1-for-8.25 reverse stock split

'

'

'

'

'1-for-8.25 reverse stock split

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders Equity Reverse Stock Split Ratio

'

'

'

'

'

0.1212

'

'

'

'

0.1212

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of Stock, Description

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Conversion of all outstanding shares of Parentbs Class C Common Stock, Class D Common Stock and Convertible Preferred Stock into Class A Common Stock on a one-for-one basis

'

'

'

'

'

'

'

'

Initial public offering, Class A Common Stock outstanding

'

'

120,105,557

27,623,629

'

'

27,623,629

70,121,378

3,813,884

'

'

3,813,885

31,464,548

'

'

'

'

'

'

'

'

'

'

Warrant extend term period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'10 years

Expiration date of warrant

'

'

'

'

'

'

'

'

'

'

'

'

'

24-Feb-22

'

'

'

'

'

'

'

'

'

Percentage of Home Sale Price Reserved

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

'

'

1.25%

'

'

Basis_of_Presentation_and_Sign5

Basis of Presentation and Significant Accounting Policies - Summary of Changes in Warranty Liability (Detail) (USD $)	7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended		2 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 24, 2012
	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
							Scenario, Previously Reported [Member]
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'
Warranty liability, beginning of period	$14,000	$14,317	$14,000	$14,314	$16,341	$21,365	'
Warranty provision during period	1,649	3,131	2,731	187	2,380	2,574	'
Warranty payments during period	-1,944	-3,900	-3,216	-845	-4,699	-8,277	'
Warranty charges related to pre-existing warranties during period	80	354	802	85	292	679	199
Warranty charges related to construction services projects	347	267	'	114	'	'	'
Fresh start adjustment	'	'	'	145	'	'	'
Warranty liability, end of period	$14,132	$14,169	$14,317	$14,000	$14,314	$16,341	'

Basis_of_Presentation_and_Sign6

Basis of Presentation and Significant Accounting Policies - Schedule of Interest Incurred under Company's Debt Obligations (Detail) (USD $)	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010
	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
Schedule Of Interest Expenses [Line Items]	'	'	'	'	'	'	'	'
Interest incurred	$7,511	$8,729	$22,336	$22,511	$30,526	$7,145	$61,464	$62,791
Less: Interest capitalized	7,460	6,238	15,009	19,909	21,399	4,638	36,935	39,138
Interest expense, net of amounts capitalized	51	2,491	7,327	2,602	9,127	2,507	24,529	23,653
Cash paid for interest	$283	$6,315	$18,061	$14,854	$26,560	$8,924	$48,018	$59,748

Emergence_From_Chapter_Eleven_

Emergence From Chapter Eleven - Additional Information (Detail) (USD $)

1 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

Feb. 24, 2012

Dec. 31, 2011

Feb. 24, 2012

Sep. 30, 2013

Feb. 24, 2012

Dec. 31, 2012

Sep. 30, 2013

Feb. 24, 2012

Dec. 31, 2012

21-May-13

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

Second Lien Notes [Member]

Second Lien Notes [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Emergence From Chapter Eleven [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock

92,400,000

'

'

'

31,464,548

'

'

12,966,366

'

10,005,000

44,793,255

44,793,255

'

Common stock par value per share

$0.01

'

'

'

$0.01

$0.01

$0.01

$0.01

$0.01

'

$0.01

$0.01

$0.01

Aggregate principal amount of senior secured notes

$283,500,000

$283,483,000

$75,000,000

$75,000,000

'

'

'

'

'

'

'

'

'

Interest rate of senior note

10.00%

'

12.00%

12.00%

'

'

'

'

'

'

'

'

'

Secured note maturity date

'

'

'2017

'2017

'

'

'

'

'

'

'

'

'

Aggregate cash consideration

'

'

'

'

25,000,000

25,000,000

'

60,000,000

10,000,000

'

'

'

'

Issuance of warrant to purchase

'

'

'

'

15,737,294

'

'

'

'

'

'

'

'

Issuance of Convertible Preferred Stock

64,831,831

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Preferred Stock issuance at par value

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

Cash consideration of preferred stock

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Cash consideration of common stock

'

'

'

'

'

'

'

$10,000,000

'

'

'

'

'

Issuance of additional common stock

'

'

'

'

'

'

'

3,144,000

3,144,000

'

'

'

'

Recovered_Sheet1

Fresh Start Accounting And Effects Of Plan - Additional Information (Detail) (USD $)

1 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2011

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Feb. 24, 2012

Seller financing [Member]

Reorganization items [Member]

Reorganization items [Member]

Reorganization items [Member]

Construction management contracts [Member]

Home in backlog [Member]

Joint venture management fees [Member]

Predecessor [Member]

Predecessor [Member]

Successor [Member]

Successor [Member]

Convertible preferred stock [Member]

Convertible preferred stock [Member]

Common Stock and Warrants [Member]

Old Common Stock [Member]

New Common Stock [Member]

Retained Earnings (Accumulated Deficit) [Member]

Minimum [Member]

Maximum [Member]

Scenario one [Member]

Scenario two [Member]

Fresh Start Accounting Adjustments [Member]

Fresh Start Accounting Adjustments [Member]

Fresh Start Accounting Adjustments [Member]

Fresh Start Accounting Adjustments [Member]

Senior Secured Term Loan [Member]

Senior Subordinated Secured Notes Due 2017 [Member]

Reorganization items [Member]

Reorganization items [Member]

Successor [Member]

Book Value [Member]

Fair Value [Member]

Convertible preferred stock [Member]

Fresh-Start Adjustment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Required emergence of voting shares

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average cost of capital

16.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Enterprise value

$485,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$485,000,000

'

'

'

Total debt

384,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Growth rate

3.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note payable, fair value

'

'

'

'

'

'

'

'

'

'

'

'

74,009,000

35,471,000

13,248,000

'

'

'

'

'

'

'

'

6,300,000

56,300,000

'

'

'

'

Note payable, book value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,500,000

55,000,000

'

'

'

'

Adjustment of one note payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-200,000

1,300,000

'

'

'

'

Risk adjusted discount rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12.50%

12.50%

'

'

'

'

Debt instrument outstanding amount

'

'

'

'

2,900,000

'

'

75,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt maturity period after plan of reorganization

'6 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable

'

'

'

'

'

9,000,000

'

'

'

'

'

'

74,009,000

35,471,000

13,248,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured debt

'

'

'

'

'

'

235,000,000

75,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt, renegotiated

384,500,000

360,471,000

338,248,000

'

'

'

'

'

'

'

'

'

563,492,000

360,471,000

338,248,000

'

'

'

'

'

'

'

'

'

'

384,500,000

'

'

'

Residual fair value of equity

100,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,500,000

'

'

'

Equity value allocation, term to liquidity event

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity value allocation, volatility based on public company comparables

'

'

'

'

'

59.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity value allocation, risk-free rate based on a 3 year treasury rate

'

'

'

'

'

0.43%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity value allocation, dividend yield

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.00%

'

'

'

'

'

'

'

'

'

'

'

'

Equity value allocation, discount for lack of marketability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

38.00%

'

'

'

'

'

'

'

'

'

'

'

Preferred stock value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

56,400,000

56,400,000

'

'

'

'

'

'

'

'

56,400,000

'

'

56,400,000

Common stock value

'

'

'

'

'

43,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44,100,000

'

'

'

Warrants value

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated fair value of intangible assets

9,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net cash received from the issuance of new equity

81,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of DIP financing

5,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment of financing fees

2,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other reorganization related costs

5,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LSTC comprised of Old Notes

283,500,000

'

'

283,483,000

'

'

'

'

'

'

'

'

489,483,000

'

325,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related accrued interest

15,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Successor's equity value

'

'

'

'

'

'

'

'

'

'

'

'

-179,516,000

309,968,000

62,712,000

'

'

'

'

'

'

'

'

'

'

100,500,000

'

'

'

Cash received for fair value of Convertible Preferred Stock issued

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50,000,000

'

'

'

'

'

'

'

'

'

50,000,000

'

'

'

New common stock, shares issued

92,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

New common stock, par value

$0.01

'

'

'

'

'

'

'

'

'

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Old common stock, shares repurchased

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjustment to additional paid-in capital

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48,900,000

27,700,000

'

'

'

'

'

'

'

'

'

Accumulated deficit

'

'

'

'

'

'

'

'

'

'

'

235,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

5,830,000

[1]

'

'

'

Adjustment to notes receivable

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-996,000

[2]

'

'

'

Notes receivable with a book value

6,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes receivable with fair value

5,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of discounted future interest received

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjustment to real estate inventory

1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unleveled discount rate for using project forecasts

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property & equipment, net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-421,000

[3]

1,000,000

600,000

'

Identifiable intangible assets

'

'

'

'

'

'

'

'

4,600,000

4,000,000

800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,470,000

[4]

'

'

'

Estimated margin on estimated costs of warranty required to transfer litigation liability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17.00%

19.00%

'

'

'

'

'

'

Estimated margin

9.40%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated deficit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

5,800,000

'

'

'

Adjustment to minority interest

$8,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

($1,588,000)

[5]

$9,700,000

$8,100,000

'

Discount rate for using cash flow approach project and estimated cash distributed to minority member of entity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17.80%

'

'

'

[1]

Reflects the elimination of a balance in accumulated deficit of $5.8 million to reduce any accumulated deficit or retained earnings in conjunction with fresh start accounting, which requires the successor entity to begin with a zero balance in retained earnings.

[2]

Reflects adjustment of $1.0 million to notes receivable with a book value of $6.2 million to fair value of $5.2 million using the discounted cash flow approach. The Company discounted the future interest to be received at a discount rate of 10%, which is above the stated rate of the note.

[3]

Reflects adjustment of $0.4 million to property and equipment with a book value of $1.0 million to fair value of $ $0.6 million, based on the estimated sales value of the assets determined on an "As Is" Basis using market comparables.

[4]

Reflects identifiable intangible assets comprised of $4.6 million relating to construction management contracts, $4.0 million relating to homes in backlog, and $0.8 million relating to joint venture management fees. The value of the construction management contracts and the joint venture management fees was estimated using the discounted cash flows of each related project at a discount rate ranging from 17% to 19%. The value of the backlog contracts was determined using the With/Without method of the income approach and the expected closing date of the home in backlog and the contracted sales price of the home.

[5]

Reflects adjustment of $1.6 million to minority interest in a consolidated entity with a book value of $9.7 million to fair value of $8.1 million. The Company used a discounted cash flow approach to the project and the estimated cash to be distributed to the minority member of the entity, using a discount rate of 17.8%.

Recovered_Sheet2

Fresh Start Accounting And Effects Of Plan (Fresh Start Consolidated Balance Sheet) (Detail) (USD $)	Feb. 24, 2012
In Thousands, unless otherwise specified
ASSETS	'
Receivables	$1,000
Real estate inventories	'
Goodwill	14,209
Total assets	580,865
LIABILITIES AND EQUITY (DEFICIT)	'
Liabilities from inventories not owned	1,200
Liabilities	87,765
William Lyon Homes stockholders' equity (deficit)	'
Noncontrolling interest	8,100
Predecessor [Member]	'
ASSETS	'
Cash and cash equivalents	12,787
Restricted cash	852
Receivables	12,790
Real estate inventories	'
Property & equipment, net	962
Deferred loan costs	8,258
Other assets	6,307
Total assets	493,746
William Lyon Homes stockholders' equity (deficit)	'
Additional paid-in capital	48,867
Accumulated deficit	-235,584
Total William Lyon Homes stockholder's equity (deficit)	-186,717
Noncontrolling interest	9,688
Total equity (deficit)	-177,029
Total liabilities and equity (deficit)	493,746
Predecessor [Member] | Real estate inventories - Owned	'
Real estate inventories	'
Real estate inventories	405,632
Predecessor [Member] | Real estate inventories - Not owned	'
Real estate inventories	'
Real estate inventories	46,158
Predecessor [Member] | Liabilities not subject to compromise	'
LIABILITIES AND EQUITY (DEFICIT)	'
Accounts payable	10,000
Accrued expenses	31,391
Liabilities from inventories not owned	46,158
Notes payable	78,394
Liabilities	371,943
Predecessor [Member] | Liabilities not subject to compromise | Secured Debt [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Secured Term Loan due January 31, 2015	206,000
Predecessor [Member] | Liabilities subject to compromise	'
LIABILITIES AND EQUITY (DEFICIT)	'
Accrued expenses	15,297
Senior Notes	298,832
Predecessor [Member] | Liabilities subject to compromise | 7 5/8% Senior Notes due December 15, 2012 [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Notes	66,704
Predecessor [Member] | Liabilities subject to compromise | 10 3/4% Senior Notes due April 1, 2013 [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Notes	138,964
Predecessor [Member] | Liabilities subject to compromise | 7 1/2% Senior Notes due February 15, 2014 [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Notes	77,867
Plan of Reorganization Adjustments [Member]	'
ASSETS	'
Cash and cash equivalents	67,746	[1]
Real estate inventories	'
Deferred loan costs	-5,767	[2]
Other assets	47	[3]
Total assets	66,055
LIABILITIES AND EQUITY (DEFICIT)	'
Redeemable convertible preferred stock	56,386	[4]
William Lyon Homes stockholders' equity (deficit)	'
Additional paid-in capital	-21,177	[5]
Accumulated deficit	229,754	[6]
Total William Lyon Homes stockholder's equity (deficit)	209,501
Total equity (deficit)	209,501
Total liabilities and equity (deficit)	66,055
Plan of Reorganization Adjustments [Member] | Real estate inventories - Owned	'
Real estate inventories	'
Real estate inventories	4,029	[7]
Plan of Reorganization Adjustments [Member] | Common stock, Class A [Member]	'
William Lyon Homes stockholders' equity (deficit)	'
Common stock	448	[8]
Plan of Reorganization Adjustments [Member] | Common stock, Class B [Member]	'
William Lyon Homes stockholders' equity (deficit)	'
Common stock	315	[8]
Plan of Reorganization Adjustments [Member] | Common stock, Class C [Member]	'
William Lyon Homes stockholders' equity (deficit)	'
Common stock	161	[8]
Plan of Reorganization Adjustments [Member] | Liabilities not subject to compromise	'
LIABILITIES AND EQUITY (DEFICIT)	'
Notes payable	-5,000	[9]
Senior Secured Term Loan due January 31, 2015	75,000	[10]
Liabilities	99,000
Plan of Reorganization Adjustments [Member] | Liabilities not subject to compromise | Secured Debt [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Secured Term Loan due January 31, 2015	29,000	[11]
Plan of Reorganization Adjustments [Member] | Liabilities subject to compromise	'
LIABILITIES AND EQUITY (DEFICIT)	'
Accrued expenses	-15,297	[12]
Senior Notes	-298,832
Plan of Reorganization Adjustments [Member] | Liabilities subject to compromise | 7 5/8% Senior Notes due December 15, 2012 [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Notes	-66,704	[12]
Plan of Reorganization Adjustments [Member] | Liabilities subject to compromise | 10 3/4% Senior Notes due April 1, 2013 [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Notes	-138,964	[12]
Plan of Reorganization Adjustments [Member] | Liabilities subject to compromise | 7 1/2% Senior Notes due February 15, 2014 [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Notes	-77,867	[12]
Fresh Start Accounting Adjustments [Member]	'
ASSETS	'
Receivables	-996	[13]
Real estate inventories	'
Property & equipment, net	-421	[14]
Goodwill	14,209	[15]
Intangibles	9,470	[16]
Total assets	21,064
William Lyon Homes stockholders' equity (deficit)	'
Additional paid-in capital	15,501	[17]
Accumulated deficit	5,830	[18]
Total William Lyon Homes stockholder's equity (deficit)	21,331
Noncontrolling interest	-1,588	[19]
Total equity (deficit)	19,743
Total liabilities and equity (deficit)	21,064
Fresh Start Accounting Adjustments [Member] | Real estate inventories - Owned	'
Real estate inventories	'
Real estate inventories	-1,198	[20]
Fresh Start Accounting Adjustments [Member] | Liabilities not subject to compromise	'
LIABILITIES AND EQUITY (DEFICIT)	'
Accrued expenses	221	[21]
Notes payable	1,100	[22]
Liabilities	1,321
Successor [Member]	'
ASSETS	'
Cash and cash equivalents	80,533
Restricted cash	852
Receivables	11,794
Real estate inventories	'
Property & equipment, net	541
Deferred loan costs	2,491
Goodwill	14,209
Intangibles	9,470
Other assets	6,354
Total assets	580,865
LIABILITIES AND EQUITY (DEFICIT)	'
Redeemable convertible preferred stock	56,386
William Lyon Homes stockholders' equity (deficit)	'
Additional paid-in capital	43,191
Total William Lyon Homes stockholder's equity (deficit)	44,115
Noncontrolling interest	8,100
Total equity (deficit)	52,215
Total liabilities and equity (deficit)	580,865
Successor [Member] | Real estate inventories - Owned	'
Real estate inventories	'
Real estate inventories	408,463
Successor [Member] | Real estate inventories - Not owned	'
Real estate inventories	'
Real estate inventories	46,158
Successor [Member] | Common stock, Class A [Member]	'
William Lyon Homes stockholders' equity (deficit)	'
Common stock	448
Successor [Member] | Common stock, Class B [Member]	'
William Lyon Homes stockholders' equity (deficit)	'
Common stock	315
Successor [Member] | Common stock, Class C [Member]	'
William Lyon Homes stockholders' equity (deficit)	'
Common stock	161
Successor [Member] | Liabilities not subject to compromise	'
LIABILITIES AND EQUITY (DEFICIT)	'
Accounts payable	10,000
Accrued expenses	31,612
Liabilities from inventories not owned	46,158
Notes payable	74,494
Senior Secured Term Loan due January 31, 2015	75,000
Liabilities	472,264
Successor [Member] | Liabilities not subject to compromise | Secured Debt [Member]	'
LIABILITIES AND EQUITY (DEFICIT)	'
Senior Secured Term Loan due January 31, 2015	$235,000
[1]	Reflects net cash received of $81.0 million from the issuance of new equity, reduced by the repayment of DIP financing of $5.2 million, payment of financing fees of $2.6 million and other reorganization related costs of $5.4 million.
[2]	Reflects the write-off of the remaining deferred loan costs of the Old Notes net of capitalization of deferred loan costs related to the Amended Term Loan.
[3]	Reflects prepaid property taxes to obtain title insurance for the second lien notes. Deferred tax assets are not reflected on the balance sheet as they have been fully reserved.
[4]	Reflects the fair value of the Convertible Preferred Stock issued pursuant to the Plan. The fair value of the total residual equity interest of $100.5 million was determined based on the enterprise value of $485.0 million determined as of the date of the plan, less the $384.5 million fair value of Long-Term debt. Cash received for the convertible preferred was $50.0 million, however as discussed previously, the Company valued the redeemable convertible preferred stock at $56.4 million.
[5]	Reflects the elimination of $48.9 million of additional paid-in capital ("APIC") relating to Old Common Stock, offset by $27.7 million of net cash received from the issuance of the Class B and Class C shares of common stock.
[6]	Reflects the elimination of $235.6 million of accumulated deficit of the Predecessor company in addition to the net impact of Plan adjustments to assets, liabilities and stockholder's equity.
[7]	Reflects contribution of land option deposit in lieu of cash for Class B Common Stock.
[8]	Reflects the issuance of 92.4 million total shares in new common stock at $0.01 par value and the extinguishment of 1,000 shares ($0.01 par) of Old Common Stock, in accordance with the plan (see Note 2 for allocation of shares).
[9]	Reflects repayment of amounts outstanding under the DIP Credit Agreement pursuant to the Plan.
[10]	Reflects the issuance of Senior Subordinated Secured Notes of $75.0 million, in accordance with the Plan.
[11]	Reflects the additional principal added to the Amended Term Loan, in accordance with the Plan.
[12]	Reflects the extinguishment of liabilities subject to compromise ("LSTC") at emergence. LSTC was comprised of $283.5 million of Old Notes and $15.3 million of related accrued interest. The holders of the Old Notes received Class A common stock of the Successor entity.
[13]	Reflects adjustment of $1.0 million to notes receivable with a book value of $6.2 million to fair value of $5.2 million using the discounted cash flow approach. The Company discounted the future interest to be received at a discount rate of 10%, which is above the stated rate of the note.
[14]	Reflects adjustment of $0.4 million to property and equipment with a book value of $1.0 million to fair value of $ $0.6 million, based on the estimated sales value of the assets determined on an "As Is" Basis using market comparables.
[15]	Goodwill represents the excess of enterprise value upon emergence over fair value of net tangible and identifiable intangible assets acquired.
[16]	Reflects identifiable intangible assets comprised of $4.6 million relating to construction management contracts, $4.0 million relating to homes in backlog, and $0.8 million relating to joint venture management fees. The value of the construction management contracts and the joint venture management fees was estimated using the discounted cash flows of each related project at a discount rate ranging from 17% to 19%. The value of the backlog contracts was determined using the With/Without method of the income approach and the expected closing date of the home in backlog and the contracted sales price of the home.
[17]	Reflects the adjustment to a combined common stock and warrants value of $44.1 million for the calculation of fair value under the provisions of fresh start accounting, based on the remaining residual equity interest of $100.5 million, as discussed in note (i) above, less the allocation to convertible preferred of $56.4 million, as also discussed in note (i).
[18]	Reflects the elimination of a balance in accumulated deficit of $5.8 million to reduce any accumulated deficit or retained earnings in conjunction with fresh start accounting, which requires the successor entity to begin with a zero balance in retained earnings.
[19]	Reflects adjustment of $1.6 million to minority interest in a consolidated entity with a book value of $9.7 million to fair value of $8.1 million. The Company used a discounted cash flow approach to the project and the estimated cash to be distributed to the minority member of the entity, using a discount rate of 17.8%.
[20]	Reflects adjustment of $1.2 million to real estate inventory using the discounted cash flow approach. The Company used project forecasts and an unlevered discount rate of 20% to arrive at fair value. Certain projects that are held for future development were valued on an "As-Is" Basis using market comparables
[21]	Reflects adjustments to warranty and construction defect litigation liabilities which were valued based on the estimated costs of warranty spending on homes previously closed plus an estimated margin of 9.4%, plus a reasonable margin required to transfer the liability or to fulfill the obligation.
[22]	Reflects adjustment of one note payable of $(0.2) million, with a book value of $6.5 million to a fair value of $6.3 million. The Company used a discounted cash flow on contracted interest and principal to be received and a risk adjusted discount rate of 12.5%. Also reflects adjustment of one note payable of $1.3 million, with a book value of $55.0 million to a fair value of $56.3 million. The Company used a discounted cash flow on contracted interest and principal to be received and a risk adjusted discount rate of 12.5%.

Fresh_Start_Accounting_And_Eff2

Fresh Start Accounting And Effects Of Plan (Schedule Of Reconciliation Of Enterprise Value To Reorganized Asset Value And Determination Of Goodwill) (Detail) (USD $)	1 Months Ended
	Feb. 24, 2012
Reorganization Items [Line Items]	'
Total enterprise value	$485,000,000
Add: liabilities (excluding debt and equity)	87,765,000
Add: noncontrolling interest	8,100,000
Reorganization value of assets	580,865,000
Fair value of assets (excluding goodwill)	566,656,000
Reorganization value in excess of fair value (goodwill)	$14,209,000

Reorganization_Items_Summary_O

Reorganization Items (Summary Of Reorganization Items) (Detail) (USD $)	3 Months Ended	7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010
	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
Reorganization [Line Items]	'	'	'	'	'	'	'
Cancellation of debt	'	'	'	'	$298,831	'	'
Plan implementation and fresh start valuation adjustments	'	'	'	'	-49,302	'	'
Professional fees	'	'	'	-2,525	-7,813	-21,182	'
Write-off of Old Notes deferred loan costs	'	'	'	'	-8,258	'	'
Total reorganization items, net	($712)	($1,894)	($464)	($2,525)	$233,458	($21,182)	'

Variable_Interest_Entities_and1

Variable Interest Entities and Noncontrolling Interests - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2011
	Joint_Ventures	Joint_Ventures
Variable Interest Entity [Line Items]	'	'	'
Percentage of profits and cash flows receivable from the joint ventures after partners' priority returns and return of partners' capital	50.00%	'	'
Consolidated variable interest entities, assets	$24.70	$68.50	$14
Consolidated variable interest entities, liabilities	6.4	21.8	1.3
Valuation adjustment to the noncontrolling interest	1.6	'	'
Number of joint ventures	1	2	'
Cash [Member]	'	'	'
Variable Interest Entity [Line Items]	'	'	'
Consolidated variable interest entities, assets	1.1	3.3	2.1
Real Estate Inventory Impairments [Member]	'	'	'
Variable Interest Entity [Line Items]	'	'	'
Consolidated variable interest entities, assets	20.4	61	8.7
Notes payable, Other Payables [Member]	'	'	'
Variable Interest Entity [Line Items]	'	'	'
Consolidated variable interest entities, liabilities	'	$19.20	'

Segment_Information_Segment_Fi

Segment Information - Segment Financial Information Relating to Operations (Detail) (USD $)

1 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

2 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Mar. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2011

Dec. 31, 2010

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Southern California [Member]

Southern California [Member]

Southern California [Member]

Southern California [Member]

Southern California [Member]

Northern California [Member]

Northern California [Member]

Northern California [Member]

Northern California [Member]

Northern California [Member]

Arizona [Member]

Arizona [Member]

Arizona [Member]

Arizona [Member]

Arizona [Member]

Nevada [Member]

Nevada [Member]

Nevada [Member]

Nevada [Member]

Nevada [Member]

Colorado [Member]

Colorado [Member]

Colorado [Member]

Corporate [Member]

Corporate [Member]

Corporate [Member]

Corporate [Member]

Corporate [Member]

Southern California [Member]

Southern California [Member]

Southern California [Member]

Northern California [Member]

Northern California [Member]

Northern California [Member]

Arizona [Member]

Arizona [Member]

Arizona [Member]

Nevada [Member]

Nevada [Member]

Nevada [Member]

Corporate [Member]

Corporate [Member]

Corporate [Member]

Operating revenue:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating revenue

'

$150,830

'

$92,987

'

$262,575

$363,121

$372,760

$25,570

'

'

'

'

$226,823

$294,698

$49,681

$36,097

$68,187

$105,231

$116,619

$27,790

$26,181

$131,747

$56,115

$154,684

$31,253

$17,157

$38,634

$86,431

$58,714

$23,920

$13,552

$24,007

$56,421

$37,307

$18,186

$58,923

$5,436

'

'

'

'

'

$7,759

$130,737

$206,241

$11,014

$54,141

$56,095

$4,316

$20,074

$16,595

$2,481

$21,871

$15,767

'

'

'

(Loss) income before provision for income taxes:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

(Loss) income before provision for income taxes

'

17,036

'

477

'

-5,562

23,653

-6,850

228,497

'

'

'

'

-192,888

-135,867

'

'

'

'

3,345

'

'

'

'

16,179

'

'

'

'

2,073

'

'

'

'

-1,146

'

'

130

'

'

'

'

-27,431

-19,131

-26,406

-83,176

6,195

-6,307

-41

9,928

-95,184

-26,887

-1,738

-30,500

-21,449

233,243

-34,491

-4,314

Net income (loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

($4,982)

$10,680

($1,288)

$466

($1,057)

($5,573)

$17,287

($6,861)

$228,497

($130,926)

($39,700)

($11,095)

($11,177)

($192,898)

($135,455)

$10,027

$889

($1,840)

$15,453

'

$4,706

$4,577

$12,169

$8,740

'

$4,224

$353

$64

$9,032

'

$3,355

$1

($1,637)

$5,881

'

$209

$1,654

'

($11,841)

[1]

($5,354)

[1]

($14,329)

[1]

($23,473)

[1]

'

($19,131)

'

'

$6,195

'

'

$9,928

'

'

($1,738)

'

'

$233,243

[1]

'

'

[1]

Includes the Company's consolidated Provision for income taxes of approximately $6.4 million and $6.4 million for the three and nine months ended September 30, 2013.

Segment_Information_Pretax_Inv

Segment Information (Pretax Inventory Impairment Charges Included In (Loss) Income Before (Provision) Benefit From Income Taxes) (Detail) (USD $)

10 Months Ended

2 Months Ended

12 Months Ended

10 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Southern California [Member]

Northern California [Member]

Arizona [Member]

Nevada [Member]

Colorado [Member]

Southern California [Member]

Southern California [Member]

Southern California [Member]

Northern California [Member]

Northern California [Member]

Northern California [Member]

Arizona [Member]

Arizona [Member]

Arizona [Member]

Nevada [Member]

Nevada [Member]

Nevada [Member]

Colorado [Member]

Colorado [Member]

Colorado [Member]

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total impairment loss on real estate assets

'

'

$128,314

$111,860

'

'

'

'

'

'

$17,962

$70,801

'

$2,074

$3,103

'

$87,607

$22,409

'

$20,671

$15,547

'

'

'

Segment_Information_Consists_o

Segment Information - Consists of Write-Off of Land Option Deposits and Pre-acquisition Costs (Detail) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

In Thousands, unless otherwise specified

Successor [Member]

Successor [Member]

Predecessor [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Reportable Geographical Components [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Southern California [Member]

Southern California [Member]

Northern California [Member]

Northern California [Member]

Arizona [Member]

Arizona [Member]

Nevada [Member]

Nevada [Member]

Colorado [Member]

Colorado [Member]

Corporate [Member]

Corporate [Member]

Southern California [Member]

Northern California [Member]

Arizona [Member]

Nevada [Member]

Colorado [Member]

Corporate [Member]

Homebuilding assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Homebuilding assets

$798,953

$581,147

$496,951

$281,967

$195,688

$130,616

$31,293

$169,581

$173,847

$76,353

$51,141

$36,769

$37,668

$103,667

[1]

$91,510

[1]

$182,781

$105,298

$129,920

$42,183

'

$36,769

[1]

[1]

Comprised primarily of cash and cash equivalents, receivables, deferred loan costs, and other assets.

Real_Estate_Inventories_Summar

Real Estate Inventories - Summary of Real Estate Inventories (Detail) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Dec. 31, 2011
In Thousands, unless otherwise specified	Successor [Member]		Successor [Member]		Predecessor [Member]
Real estate inventories owned:	'		'		'
Land deposits	$40,816		$31,855		$26,939
Land and land under development	439,401		318,327		267,348
Homes completed and under construction	138,500		50,847		90,824
Model homes	21,445		20,601		13,423
Total	640,162		421,630		398,534
Real estate inventories not owned:	'		'		'
Other land options contracts - land banking arrangement	$20,738	[1]	$39,029	[1],[2]	$47,408	[2]
[1]	Represents the consolidation of a land banking arrangement. Although the Company is not obligated to purchase the lots, based on certain factors, the Company has determined that it is economically compelled to purchase the lots in the land banking arrangement. Amounts are net of deposits.
[2]	Represents the consolidation of a land banking arrangement which does not obligate the Company to purchase the lots, however, based on certain factors, the Company has determined it is economically compelled to purchase the lots in the land banking arrangement, which has been consolidated. Amounts are net of deposits.

Real_Estate_Inventories_Additi

Real Estate Inventories - Additional Information (Detail) (USD $)	7 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventory [Line Items]	'	'	'	'
Impairment loss on real estate assets	$0	$0	$0	$128.30

Goodwill_Narrative_Detail

Goodwill (Narrative) (Detail) (USD $)	Dec. 31, 2012	Feb. 24, 2012
Goodwill [Line Items]	'	'
Goodwill	$14,200,000	'
Goodwill in connection with fresh start accounting	'	$14,209,000

Goodwill_Schedule_Of_Goodwill_

Goodwill (Schedule Of Goodwill) (Detail) (USD $)

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

In Thousands, unless otherwise specified

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Southern California [Member]

Northern California [Member]

Arizona [Member]

Nevada [Member]

Southern California [Member]

Northern California [Member]

Arizona [Member]

Nevada [Member]

Colorado [Member]

Goodwill [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

$14,200

$14,209

$14,209

$4,885

$1,916

$5,951

$1,457

'

'

'

'

'

'

Intangibles_Carrying_Value_And

Intangibles (Carrying Value And Accumulated Amortization Of Intangible Assets) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Intangible Assets Disclosure [Line Items]	'	'
Net Carrying Amount	'	$4,620
Successor [Member]	'	'
Intangible Assets Disclosure [Line Items]	'	'
Carrying Value	'	10,377
Accumulated Amortization	-6,930	-5,757
Net Carrying Amount	3,446	4,620
Successor [Member] | Construction management contracts [Member]	'	'
Intangible Assets Disclosure [Line Items]	'	'
Carrying Value	'	4,640
Accumulated Amortization	'	-1,295
Net Carrying Amount	'	3,345
Successor [Member] | Homes in backlog [Member]	'	'
Intangible Assets Disclosure [Line Items]	'	'
Carrying Value	'	4,937
Accumulated Amortization	'	-4,169
Net Carrying Amount	'	768
Successor [Member] | Joint venture management fee contracts [Member]	'	'
Intangible Assets Disclosure [Line Items]	'	'
Carrying Value	'	800
Accumulated Amortization	'	-293
Net Carrying Amount	'	$507

Intangibles_Additional_Informa

Intangibles - Additional Information (Detail) (USD $)	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 24, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 07, 2012
				Village Homes [Member]
Intangible Assets [Line Items]	'	'	'	'
Amortization expense related to intangible assets	'	$5,800,000	'	'
Estimated fair value of intangible assets	$9,500,000	'	'	$900,000
Weighted average remaining useful life of intangible assets	'	'	'24 months	'

Intangibles_Estimated_Future_A

Intangibles (Estimated Future Amortization Expense) (Detail) (USD $)	Dec. 31, 2012
In Thousands, unless otherwise specified
Estimated Amortization Expense [Line Items]	'
2013	$1,725
2014	1,244
2015	1,651
Net Carrying Amount	$4,620

Senior_Notes_and_Secured_Indeb2

Senior Notes and Secured Indebtedness - Details of Notes Payable and Senior Notes (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	$283,500	$283,483
Notes payable:	'	'	'	'
Total notes payable and Senior Notes	360,471	338,248	384,500	'
Successor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	325,000	'	'
Notes payable:	'	'	'	'
Notes payable	35,471	13,248	'	'
Total notes payable and Senior Notes	360,471	338,248	'	'
Successor [Member] | Revolving Credit Facility [Member]	'	'	'	'
Notes payable:	'	'	'	'
Notes payable	0	0	'	'
Successor [Member] | Construction notes payable [Member]	'	'	'	'
Notes payable:	'	'	'	'
Notes payable	19,233	13,248	'	'
Successor [Member] | Seller financing [Member]	'	'	'	'
Notes payable:	'	'	'	'
Notes payable	16,238	0	'	'
Predecessor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	489,483
Notes payable:	'	'	'	'
Notes payable	'	'	'	74,009
Total notes payable and Senior Notes	'	'	'	563,492
8 1/2% Senior Notes due November 15, 2020 [Member] | Successor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	325,000	325,000	'	'
8 1/2% Senior Notes due November 15, 2020 [Member] | Predecessor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	0
Senior Secured Term Loan [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Senior Secured Debt	'	235,000	'	'
Senior Secured Term Loan [Member] | Successor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Senior Secured Debt	'	0	'	'
Senior Secured Term Loan [Member] | Predecessor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Senior Secured Debt	'	'	'	206,000
7 5/8% Senior Notes due December 15, 2012 [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	66,704
7 5/8% Senior Notes due December 15, 2012 [Member] | Successor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	0	'	'
7 5/8% Senior Notes due December 15, 2012 [Member] | Predecessor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	66,704
10 3/4% Senior Notes due April 1, 2013 [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	138,912
10 3/4% Senior Notes due April 1, 2013 [Member] | Successor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	0	'	'
10 3/4% Senior Notes due April 1, 2013 [Member] | Predecessor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	138,912
7 1/2% Senior Notes due February 15, 2014 [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	77,867
7 1/2% Senior Notes due February 15, 2014 [Member] | Successor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	0	'	'
7 1/2% Senior Notes due February 15, 2014 [Member] | Predecessor [Member]	'	'	'	'
Senior Notes:	'	'	'	'
Total Senior Notes	'	'	'	$77,867

Senior_Notes_and_Secured_Indeb3

Senior Notes and Secured Indebtedness - Details of Notes Payable and Senior Notes (Parenthetical) (Detail)

1 Months Ended

9 Months Ended

12 Months Ended

Sep. 03, 2009

Feb. 24, 2012

Nov. 08, 2012

Nov. 22, 2004

Mar. 17, 2003

Feb. 06, 2004

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Senior Secured Term Loan [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Senior Secured Term Loan [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Senior Secured Term Loan [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, maturity date

30-Sep-16

'

'

'

'

'

15-Nov-20

15-Nov-20

31-Jan-15

15-Dec-12

1-Apr-13

15-Feb-14

15-Nov-20

31-Jan-15

15-Dec-12

1-Apr-13

15-Feb-14

Debt instrument, interest rate percentage

'

10.00%

10.25%

7.63%

10.75%

7.50%

8.50%

8.50%

'

7.63%

10.75%

7.50%

8.50%

'

7.63%

10.75%

7.50%

Senior_Notes_and_Secured_Indeb4

Senior Notes and Secured Indebtedness - Maturities of Notes Payable and Senior Notes (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'	'
2013	$0	'	'
2014	1,762	'	'
2015	14,476	13,248	'
2016	19,233	'	'
2017	0	'	'
Thereafter	325,000	325,000	'
Total notes payable and Senior Notes	$360,471	$338,248	$384,500

Senior_Notes_and_Secured_Indeb5

Senior Notes and Secured Indebtedness - 8 1/2% Senior Notes Due 2020 - Additional Information (Detail) (USD $)

1 Months Ended

1 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 03, 2009

Feb. 24, 2012

Nov. 08, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Nov. 08, 2012

Feb. 24, 2012

Nov. 08, 2012

Dec. 31, 2010

Dec. 31, 2012

Nov. 08, 2012

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

Senior Secured Term Loan [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

Project debt [Member]

California Lyon [Member]

California Lyon [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

California Lyon [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument interest rate

'

10.00%

8.50%

'

'

'

'

'

'

'

'

10.25%

12.00%

12.00%

'

'

'

Aggregate principal amount

'

'

$325

'

'

'

'

'

'

'

'

$235

$75

$76

$37.30

'

$11

Percentage of issuance price on face value

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt amount, outstanding

'

'

'

'

$325

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, maturity date

30-Sep-16

'

'

15-Nov-20

15-Nov-20

'

'

'

'

'

'

'

25-Feb-17

'

'

'

'

Interest at an annual rate

'

'

'

8.50%

8.50%

'

'

'

'

'

'

'

'

'

'

'

'

First requisite repayment date

'

'

'

'

15-May-13

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument redemption date

'

'

'

'November 15, 2016

'November 15, 2016

'

'

'

'

'

'

'

'

'

'

'

'

Notice period for redemption of Notes

'

'

'

'

'

'

'

'30 days

'30 days

'60 days

'60 days

'

'

'

'

'

'

Percentage of redemption price of principal amount

'

'

'

100.00%

100.00%

108.50%

108.50%

'

'

'

'

'

'

'

'

100.00%

'

Principal amount of notes redeemed

'

'

'

'

'

35.00%

35.00%

'

'

'

'

'

'

'

'

'

'

Senior_Notes_and_Secured_Indeb6

Senior Notes and Secured Indebtedness - Summary of Senior Notes Redemption Prices Percentage (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]	'	'
2016	104.25%	104.25%
2017	102.13%	102.13%
2018 and thereafter	100.00%	100.00%

Recovered_Sheet3

Senior Notes And Secured Indebtedness (Narrative) (Detail) (USD $)

1 Months Ended

12 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

31-May-12

Sep. 03, 2009

Dec. 31, 2012

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2012

Nov. 08, 2012

Feb. 24, 2012

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2012

Nov. 08, 2012

Dec. 31, 2010

Dec. 31, 2012

Dec. 31, 2011

Nov. 22, 2004

Mar. 17, 2003

Dec. 31, 2011

Feb. 06, 2004

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2010

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Senior Secured Term Loan [Member]

Senior Secured Term Loan [Member]

Term Loan Agreement [Member]

Term Loan Agreement [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

Senior Subordinated Secured Notes [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

California Lyon [Member]

California Lyon [Member]

Senior Secured Term Loan [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan outstanding

'

'

'

'

'

$235,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$206,000,000

'

'

'

Debt instrument interest rate

'

'

'

'

10.00%

'

10.25%

10.25%

14.00%

12.00%

'

12.00%

'

'

'

7.63%

10.75%

'

7.50%

'

'

'

'

7.63%

10.75%

7.50%

Debt instrument, maturity date

'

30-Sep-16

'

'

'

'

'

31-Jan-15

20-Oct-14

25-Feb-17

'

'

'

'

'

'

'

'

'

'

'

'

31-Jan-15

15-Dec-12

1-Apr-13

15-Feb-14

Gain (loss) on extinguishment of debt

1,000,000

'

-300,000

'

'

-1,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,572,000

5,572,000

'

'

'

'

Percentage of interest rate to pay loan amount

'

'

'

'

'

'

'

'

15.63%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discounted interest rate for prepayment

'

'

'

'

'

'

'

'

14.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

'

'

'

235,000,000

'

'

75,000,000

'

76,000,000

37,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, cash interest rate

'

'

'

'

'

'

'

'

'

'

8.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining interest rate

'

'

'

'

'

'

'

'

'

'

4.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of redemption price of principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

Debt amount, outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66,700,000

150,000,000

250,000,000

138,900,000

150,000,000

77,900,000

'

'

'

'

'

'

Percentage of issuance price on face value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

98.49%

'

'

'

'

'

'

'

'

'

Cash proceeds from issuance of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

246,200,000

'

147,600,000

'

'

'

'

'

'

'

Percentage of discount to yield

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11.00%

'

'

'

'

'

'

'

'

'

Redemption of long-term debt

'

'

'

'

'

'

'

'

'

'

'

'

31,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain on early redemption of debt

'

'

'

$5,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recovered_Sheet4

Senior Notes And Secured Indebtedness (Principal Amounts Of Senior Notes Outstanding) (Detail) (USD $)	Feb. 24, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Senior Notes	$283,500	$283,483
7 5/8% Senior Notes due December 15, 2012 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	'	66,704
10 3/4% Senior Notes due April 1, 2013 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	'	138,912
7 1/2% Senior Notes due February 15, 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	'	$77,867

Senior_Notes_and_Secured_Indeb7

Senior Notes and Secured Indebtedness - Notes Payable - Additional Information (Detail) (USD $)

1 Months Ended

12 Months Ended

12 Months Ended

9 Months Ended

7 Months Ended

10 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

9 Months Ended

31-May-12

Sep. 03, 2009

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Jun. 01, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Oct. 31, 2011

Feb. 24, 2012

Sep. 30, 2013

Aug. 07, 2013

Sep. 30, 2013

Mar. 05, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Aug. 07, 2013

Seller financing [Member]

Seller financing [Member]

Seller financing [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Construction notes payable agreement three [Member]

Construction notes payable agreement three [Member]

Construction notes payable agreement three [Member]

Construction notes payable agreement two [Member]

Construction notes payable agreement two [Member]

Construction notes payable agreement two [Member]

Construction notes payable agreement one [Member]

Construction notes payable agreement one [Member]

Construction totes two [Member]

Construction notes one [Member]

Other construction notes [Member]

Other construction notes [Member]

Land Acquisition Note Payable [Member]

Land Acquisition Note Payable [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving line of credit loan agreement

First note [Member]

Second note [Member]

Seller financing [Member]

Seller financing [Member]

Seller financing [Member]

Revolver [Member]

Revolver [Member]

CB&T Loan Agreement [Member]

CB&T Loan Agreement [Member]

CB&T Loan Agreement [Member]

CB&T Loan Agreement [Member]

Fixed rate [Member]

Variable rate [Member]

Revolver [Member]

Second note [Member]

Minimum [Member]

Maximum [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable

'

'

'

'

'

$1,700,000

'

'

$13,248,000

$35,471,000

$16,238,000

$0

$14,500,000

$19,000,000

$28,000,000

'

$17,000,000

'

'

$19,000,000

'

$16,000,000

$9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, maturity date

'

30-Sep-16

'

'

1-Mar-12

1-Mar-14

31-May-15

'

'

'

'

'

'

'

'

'

31-Mar-15

'

'

30-Sep-15

'

'

1-Jan-12

1-May-15

'

1-Oct-12

'

'

'

5-Mar-16

'

'

'

'

'

'

Debt Instrument Interest Rate Description

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Prime rate +0.5%, with a rate floor of 4.0%

'Prime rate +1.0%, with a rate floor of 5.0%

'Prime + 1%, with a rate floor of 5.0%

'Prime rate +1%, with a rate floor of 5.0%,

'

'Prime Rate + 1.0%, with a rate floor of 5.0%

'

'

'

'

'

'

'

'

'

'

'

'

'

'A fixed rate at LIBOR plus 3.00% per annum

'A variable rate at the Prime Rate, as adjusted by CB&T in accordance with the CB&T Loan Agreement, plus 1.00% per annum

'

Debt amount, outstanding

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

5,400,000

'

7,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, floor

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, renegotiated maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1-Jan-13

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, floor

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

First requisite repayment date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Mar-12

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding principal balance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,000,000

'

'

'

'

'

'

'

'

'

'

'

Fixed interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

Principal payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

Gain (loss) on extinguishment of debt

1,000,000

'

-300,000

'

'

'

'

975,000

-1,392,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-200,000

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition price of land

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

56,000,000

'

'

'

'

'

'

'

'

'

'

Loan value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

55,000,000

'

'

'

'

'

'

'

'

'

'

Debt instrument, interest rate percentage

'

'

'

10.00%

7.00%

3.00%

7.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.50%

'

'

'

'

'

'

'

'

'

'

Loan value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

56,300,000

'

'

'

'

'

'

'

'

'

Amortization expense, net

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving Line of credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000,000

'

30,000,000

'

'

'

'

50,000,000

Line Of Credit Facility, Additional Capacity Under Accordion Feature

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

125,000,000

'

'

'

'

'

'

'

Annual accrual rate of commitment fee on unused portion of credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

'

'

'

'

'

'

'

'

Debt instrument, floor interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.25%

5.00%

'

'

'

Credit facility, reduction in maximum amount available under loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,500,000

'

'

'

'

'

'

Loan matures in days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Every 90 days

'

'

'

'

'

'

Credit facility, amount outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

$7,800,000

$19,200,000

'

'

$5,400,000

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

Senior_Notes_and_Secured_Indeb8

Senior Notes and Secured Indebtedness - Additional Information (Detail) (William Lyon Homes [Member])	Sep. 30, 2013	Dec. 31, 2012
William Lyon Homes [Member]	'	'
Debt Instrument [Line Items]	'	'
Ownership percentage	100.00%	100.00%

Senior_Notes_and_Secured_Indeb9

Senior Notes and Secured Indebtedness - Condensed Consolidating Balance Sheet (Detail) (USD $)

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2011

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2011

Dec. 31, 2011

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Feb. 24, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

In Thousands, unless otherwise specified

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Liabilities not subject to compromise

Liabilities subject to compromise

7 5/8% Senior Notes due December 15, 2012 [Member]

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Liabilities not subject to compromise

Liabilities subject to compromise

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Liabilities subject to compromise

Liabilities subject to compromise

Liabilities subject to compromise

Liabilities not subject to compromise

Liabilities subject to compromise

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Liabilities subject to compromise

Liabilities not subject to compromise

Liabilities subject to compromise

Liabilities not subject to compromise

8 1/2% Senior Notes due November 15, 2020 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Liabilities subject to compromise

Liabilities subject to compromise

Liabilities subject to compromise

ASSETS

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

'

'

'

'

'

'

$80,532

$20,061

$71,286

$117,587

'

'

'

'

'

'

'

'

'

$0

$0

$0

$76,158

$14,333

$69,499

$115,247

'

'

'

'

'

$52

$47

$131

$111

'

$4,322

$5,681

$1,656

$2,229

'

'

$0

$0

$0

'

$81,922

$71,075

$74,445

$80,532

'

'

'

'

'

'

'

$0

$0

$0

$77,976

$69,376

$71,619

$76,158

'

'

$313

$65

$56

$52

$3,633

$1,634

$2,770

$4,322

$0

$0

$0

Restricted cash

'

'

'

'

'

'

'

852

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

852

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

853

853

'

'

'

'

'

'

'

'

'

'

'

'

853

853

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Receivables

'

'

'

'

'

'

'

13,732

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,897

'

'

'

'

'

'

'

'

310

'

'

'

'

3,525

'

'

'

'

'

'

'

'

21,655

14,789

'

'

'

'

'

'

'

'

'

'

'

'

15,979

11,278

'

'

'

'

1,323

296

'

'

4,353

3,215

'

'

'

'

'

Real estate inventories

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Owned

'

'

'

'

'

'

'

398,534

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

278,939

'

'

'

'

'

'

'

'

'

'

'

'

'

119,595

'

'

'

'

'

'

'

'

640,162

421,630

'

'

'

'

'

'

'

'

'

'

'

'

574,987

398,952

'

'

'

'

1,839

13

'

'

63,336

22,665

'

'

'

'

'

Not owned

'

'

'

'

'

'

'

47,408

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

47,408

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20,738

[2]

39,029

[1],[2]

'

'

'

'

'

'

'

'

'

'

'

'

20,738

39,029

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred loan costs

'

'

'

'

'

'

'

8,810

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,810

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,088

7,036

'

'

'

'

'

'

'

'

'

'

'

'

8,088

7,036

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

14,200

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14,209

14,209

'

'

'

'

'

'

'

'

'

'

'

'

14,209

14,209

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intangibles

4,620

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,446

4,620

'

'

'

'

'

'

'

'

'

'

'

'

3,446

4,620

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other assets

'

'

'

'

'

'

'

7,554

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,671

'

'

'

'

'

'

'

'

159

'

'

'

'

724

'

'

'

'

'

'

'

'

7,880

7,906

'

'

'

'

'

'

'

'

'

'

'

'

6,672

7,437

'

'

'

'

863

146

'

'

345

323

'

'

'

'

'

Investments in subsidiaries

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-179,516

'

'

-85,714

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

265,230

'

'

'

'

'

'

'

'

'

'

'

'

'

309,968

62,712

'

31,144

22,148

'

'

'

'

'

'

'

'

'

'

'

'

-341,112

-84,860

'

Intercompany receivables

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

203,517

'

'

'

'

12

'

'

'

'

'

-203,529

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

220,142

207,239

'

'

18,865

18,935

'

'

-239,007

-226,174

'

Total assets

'

'

'

'

'

'

'

496,951

'

'

'

'

'

'

'

'

'

'

'

'

-179,516

'

'

281,196

'

'

'

'

'

'

'

'

204,033

'

'

'

'

129,537

'

'

'

'

'

61,701

'

'

798,953

581,147

'

'

'

'

'

'

'

'

'

309,968

62,712

'

754,092

574,938

'

'

'

'

224,480

207,759

'

'

90,532

46,772

'

'

-580,119

-311,034

'

LIABILITIES AND (DEFICIT) EQUITY

'

'

'

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'

'

'

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'

'

'

'

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'

'

'

'

'

'

'

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'

'

'

'

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'

'

'

'

'

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'

'

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'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts payable

'

'

'

'

'

'

'

'

'

'

1,436

3,946

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,436

2,560

'

'

'

'

'

'

'

38

'

'

'

'

'

1,348

'

'

'

'

19,400

18,735

'

'

18,735

'

'

'

'

'

'

'

'

'

16,185

17,998

'

'

'

'

1,005

39

'

'

2,210

698

'

'

'

'

'

Accrued expenses

'

'

'

'

'

'

'

'

'

'

2,082

48,457

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,082

47,051

'

'

'

'

'

'

'

218

'

'

'

'

'

1,188

'

'

'

'

60,391

41,770

'

'

41,770

'

'

'

'

'

'

'

'

'

59,535

41,505

'

'

'

'

777

213

'

'

79

52

'

'

'

'

'

Liabilities from inventories not owned

'

'

'

'

'

'

'

'

'

'

47,408

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

47,408

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20,738

39,029

'

'

39,029

'

'

'

'

'

'

'

'

'

20,738

39,029

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable

'

'

'

'

'

'

'

74,009

'

'

74,009

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,010

'

'

'

'

'

'

'

'

'

'

'

'

'

70,999

'

'

'

'

'

35,471

13,248

'

'

13,248

'

'

'

'

'

'

'

'

'

14,476

7,809

'

'

'

'

1,762

'

'

'

19,233

5,439

'

'

'

'

'

Senior Notes

'

283,500

283,483

66,704

138,912

77,867

'

489,483

'

'

'

'

66,704

66,704

138,912

138,912

77,867

77,867

0

'

'

'

'

'

'

'

'

'

66,704

138,912

77,867

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

325,000

'

'

'

'

0

0

0

325,000

325,000

'

'

'

'

'

'

'

325,000

325,000

'

'

'

'

'

'

'

'

'

'

'

Secured debt

'

'

'

'

'

'

'

'

'

'

206,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

206,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

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'

Intercompany payables

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

71,459

'

'

'

'

'

'

'

'

'

'

'

'

'

132,070

'

'

'

'

-203,529

'

'

'

'

'

'

'

'

'

'

'

'

'

'

229,125

217,146

'

'

'

'

'

'

'

'

9,881

9,028

'

'

-239,006

-226,174

'

Liabilities

'

'

'

'

'

'

'

666,821

'

'

330,935

335,886

'

'

'

'

'

'

'

'

'

'

'

664,489

'

'

331,395

333,094

'

'

'

'

256

'

'

256

'

205,605

'

'

203,069

2,536

'

-203,529

'

-203,529

461,000

437,782

'

'

437,782

'

'

'

'

'

'

'

'

'

665,059

648,487

'

'

'

'

3,544

252

'

'

31,403

15,217

'

'

-239,006

-226,174

'

Redeemable convertible preferred stock

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

71,246

'

'

'

'

'

'

'

'

'

'

'

'

'

71,246

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

(Deficit) equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

William Lyon Homes stockholders' (deficit) equity

'

'

'

'

'

'

'

-179,516

'

'

'

'

'

'

'

'

'

'

'

'

-179,516

'

'

-383,293

'

'

'

'

'

'

'

'

203,777

'

'

'

'

-85,714

'

'

'

'

'

265,230

'

'

309,968

62,712

'

'

'

'

'

'

'

'

'

309,968

62,712

'

89,033

-144,795

'

'

'

'

220,936

207,507

'

'

31,144

22,148

'

'

-341,113

-84,860

'

Noncontrolling interest

'

'

'

'

'

'

'

9,646

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,646

'

'

'

'

'

'

'

'

27,985

9,407

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27,985

9,407

'

'

'

'

'

Total liabilities and (deficit) equity

'

'

'

'

'

'

'

$496,951

'

'

'

'

'

'

'

'

'

'

'

'

($179,516)

'

'

$281,196

'

'

'

'

'

'

'

'

$204,033

'

'

'

'

$129,537

'

'

'

'

'

$61,701

'

'

$798,953

$581,147

'

'

'

'

'

'

'

'

'

$309,968

$62,712

'

$754,092

$574,938

'

'

'

'

$224,480

$207,759

'

'

$90,532

$46,772

'

'

($580,119)

($311,034)

'

[1]

Represents the consolidation of a land banking arrangement which does not obligate the Company to purchase the lots, however, based on certain factors, the Company has determined it is economically compelled to purchase the lots in the land banking arrangement, which has been consolidated. Amounts are net of deposits.

[2]

Represents the consolidation of a land banking arrangement. Although the Company is not obligated to purchase the lots, based on certain factors, the Company has determined that it is economically compelled to purchase the lots in the land banking arrangement. Amounts are net of deposits.

Recovered_Sheet5

Senior Notes and Secured Indebtedness - Condensed Consolidating Statement of Operations (Detail) (USD $)

1 Months Ended

2 Months Ended

10 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

2 Months Ended

3 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

31-May-12

Feb. 24, 2012

Dec. 31, 2012

Dec. 31, 2012

Mar. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Operating revenue

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Home sales

'

'

'

'

'

$141,352

'

$85,942

'

$246,102

$341,682

$348,935

'

'

'

'

'

$76,178

$68,008

$111,159

$173,032

$198,108

$48,487

$10,629

$32,105

$142,105

$47,989

$16,687

$7,305

$102,838

$26,545

$102,838

'

'

'

'

'

$16,687

'

'

'

'

$207,055

$284,069

'

'

'

$10,024

$176,992

$263,864

$4,316

$19,954

$16,595

$2,347

$10,109

$3,610

'

'

'

Construction services

'

'

'

'

'

9,478

'

7,045

'

16,473

21,439

23,825

'

'

'

'

'

9,478

7,045

16,473

21,439

23,825

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,883

'

'

'

'

19,768

10,629

'

'

'

8,883

19,768

10,629

'

'

'

'

'

'

'

'

'

Management fees

'

'

'

'

'

0

'

0

'

0

0

0

'

'

'

'

'

456

278

534

-727

534

'

'

'

'

'

'

'

'

'

'

-456

-278

-534

727

-534

0

'

'

'

'

0

0

'

'

'

110

468

165

'

'

'

'

'

'

-110

-468

-165

Revenues

'

'

'

'

'

150,830

'

92,987

'

262,575

363,121

372,760

'

'

'

'

'

86,112

75,331

128,166

193,744

222,467

48,487

10,629

32,105

142,105

47,989

16,687

7,305

102,838

26,545

102,838

-456

-278

-534

727

-534

25,570

'

'

'

'

226,823

294,698

'

'

'

19,017

197,228

274,658

4,316

19,954

16,595

2,347

10,109

3,610

-110

-468

-165

Operating costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales

'

'

'

'

'

-107,957

'

-70,795

'

-215,130

-270,770

-297,989

'

'

'

'

'

-55,968

-57,050

-94,003

-132,270

-163,083

-40,519

-8,912

-27,737

-119,051

-41,516

-11,926

-5,111

-93,924

-18,722

-93,924

456

278

534

-727

534

-14,598

'

'

'

'

-188,723

-246,177

'

'

'

-8,819

-162,148

-228,542

-3,820

-18,225

-16,167

-2,069

-8,818

-1,633

110

468

165

Impairment loss on real estate assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-128,314

-111,860

'

'

'

'

-70,742

-111,860

'

'

'

'

-57,572

'

'

'

'

Construction services

'

'

'

'

'

-8,135

'

-6,410

'

-15,061

-17,472

-21,416

'

'

'

'

'

-8,135

-6,410

-15,061

-17,472

-21,416

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-8,223

'

'

'

'

-18,164

-7,805

'

'

'

-8,223

-18,164

-7,805

'

'

'

'

'

'

'

'

'

Sales and marketing

'

'

'

'

'

-6,679

'

-4,172

'

-8,835

-17,482

-13,928

'

'

'

'

'

-4,108

-3,219

-6,493

-9,826

-10,705

-2,256

-643

-1,679

-6,867

-2,617

-315

-310

-663

-789

-606

'

'

'

'

'

-1,944

'

'

'

'

-16,848

-19,746

'

'

'

-1,496

-14,528

-17,953

-260

-1,318

-1,208

-188

-1,002

-585

'

'

'

General and administrative

'

'

'

'

'

-10,200

'

-5,440

'

-13,925

-28,016

-26,095

'

'

'

'

'

-9,473

-5,368

-13,733

-26,162

-25,872

-726

-70

-186

-1,835

-221

-1

-2

-6

-19

-2

'

'

'

'

'

-3,302

'

'

'

'

-22,411

-25,129

'

'

'

-3,246

-22,070

-24,795

-56

-340

-313

'

-1

-21

'

'

'

Amortization of intangible assets

'

'

-5,800

'

'

-191

'

-1,640

'

-5,034

-1,173

-5,757

'

'

'

'

'

-191

-1,640

-5,034

-1,173

-5,757

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other

'

'

'

'

'

-695

'

-945

'

-2,402

-1,746

-2,909

'

'

'

'

'

-695

-588

-1,713

-1,744

-3,027

'

'

-2

-2

-2

'

-357

-687

'

120

'

'

'

'

'

-187

'

'

'

'

-3,983

-2,740

'

'

'

-16

-2,979

-2,740

'

'

'

-171

-1,004

'

'

'

'

Operating expenses

'

'

'

'

'

-133,857

'

-89,402

'

-260,387

-336,659

-368,094

'

'

'

'

'

-78,570

-74,275

-136,037

-188,647

-229,860

-43,501

-9,625

-29,604

-127,755

-44,356

-12,242

-5,780

-95,280

-19,530

-94,412

456

278

534

-727

534

-28,254

'

'

'

'

-378,443

-413,457

'

'

'

-21,800

-290,631

-393,695

-4,136

-19,883

-17,688

-2,428

-68,397

-2,239

110

468

165

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,605

916

'

'

'

'

3,605

916

'

'

'

'

'

'

'

'

'

(Loss) income from subsidiaries

'

'

'

'

'

0

'

0

'

0

0

0

12,716

-752

-7,611

17,562

-8,859

5,804

1,158

8,620

13,800

11,681

'

'

'

'

'

'

'

'

'

'

-18,520

-406

-1,009

-31,362

-2,822

0

'

'

'

'

0

0

228,383

-193,330

-136,786

11,536

-59,588

-1,053

'

'

12

'

'

'

-239,919

252,918

137,827

Operating (loss) income

'

'

'

'

'

16,973

'

3,585

'

2,188

26,462

4,666

12,716

-752

-7,611

17,562

-8,859

13,346

2,214

749

18,897

4,288

4,986

1,004

2,501

14,350

3,633

4,445

1,525

7,558

7,015

8,426

-18,520

-406

-1,009

-31,362

-2,822

-2,684

'

'

'

'

-148,015

-117,843

228,383

-193,330

-136,786

8,753

-149,386

-119,174

180

71

-1,081

-81

-58,288

1,371

-239,919

252,918

137,827

(Loss) gain on extinguishment of debt

1,000

'

'

-300

'

'

'

'

'

975

'

-1,392

'

'

'

'

'

'

'

'

'

-1,392

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,572

'

'

'

'

'

5,572

'

'

'

'

'

'

'

'

'

Interest expense, net of amounts capitalized

'

'

'

'

'

-51

'

-2,491

'

-7,327

-2,602

-9,127

'

'

'

'

'

-51

-2,350

-6,970

-2,476

-9,227

'

'

'

-126

'

'

-141

-357

'

100

'

'

'

'

'

-2,507

'

'

'

'

-24,529

-23,653

'

'

'

-2,407

-23,639

-23,653

'

'

'

-100

-890

'

'

'

'

Other income (expense), net

'

'

'

'

'

114

'

95

'

1,471

257

1,528

'

'

'

'

'

423

160

562

1,184

618

-9

-53

-45

-20

-61

-300

-12

954

-907

971

'

'

'

'

'

230

'

'

'

'

838

57

'

'

'

266

1,018

280

-25

-131

-235

-11

-49

12

'

'

'

(Loss) income before reorganization items and provision for income taxes

'

'

'

'

'

17,036

'

1,189

'

-3,668

24,117

-4,325

'

-752

-7,611

17,562

-8,859

'

24

-5,659

17,605

-5,713

'

951

2,456

14,204

3,572

'

1,372

8,155

6,108

9,497

'

-406

-1,009

-31,362

-2,822

-4,961

'

'

'

'

-171,706

-135,867

228,383

-193,330

'

6,612

-172,007

'

155

-60

'

-192

-59,227

'

-239,919

252,918

'

Reorganization items

'

'

'

'

'

'

'

-712

'

-1,894

-464

-2,525

'

'

'

'

'

'

-712

-1,895

-464

-3,073

'

'

1

'

1

'

'

'

'

547

'

'

'

'

'

233,458

'

'

'

'

-21,182

'

'

'

'

221,796

-21,182

'

-1

'

'

11,663

'

'

'

'

'

(Loss) income before (provision) benefit from income taxes

'

'

'

'

'

17,036

'

477

'

-5,562

23,653

-6,850

12,716

-752

-7,611

17,562

-8,859

13,718

-688

-7,554

17,141

-8,786

4,977

951

2,457

14,204

3,573

4,145

1,372

8,155

6,108

10,044

-18,520

-406

-1,009

-31,362

-2,822

228,497

'

'

'

'

-192,888

-135,867

228,383

-193,330

-136,786

228,408

-193,189

-136,975

154

-60

-1,316

11,471

-59,227

1,383

-239,919

252,918

137,827

(Provision) benefit for income taxes

'

'

'

'

'

-6,356

'

-11

'

-11

-6,366

-11

'

'

'

'

'

-6,356

-11

-11

-6,366

-11

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

-10

412

'

'

'

'

-10

412

'

'

'

'

'

'

'

'

'

Net (loss) income

'

'

'

'

-4,982

10,680

-1,288

466

-1,057

-5,573

17,287

-6,861

12,716

-752

-7,611

17,562

-8,859

7,362

-699

-7,565

10,775

-8,797

4,977

951

2,457

14,204

3,573

4,145

1,372

8,155

6,108

10,044

-18,520

-406

-1,009

-31,362

-2,822

228,497

-130,926

-39,700

-11,095

-11,177

-192,898

-135,455

228,383

-193,330

-136,786

228,408

-193,199

-136,563

154

-60

-1,316

11,471

-59,227

1,383

-239,919

252,918

137,827

Less: Net income attributable to noncontrolling interest

'

'

'

'

'

-3,118

'

-1,218

'

-2,038

-4,879

-1,998

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-3,118

-1,218

-2,038

-4,879

-1,998

'

'

'

'

'

-114

'

'

'

'

-432

-1,331

'

'

'

'

'

'

'

'

'

-114

-432

-1,331

'

'

'

Net (loss) income attributable to William Lyon Homes

'

'

'

'

'

7,562

'

-752

'

-7,611

12,408

-8,859

12,716

-752

-7,611

17,562

-8,859

7,362

-699

-7,565

10,775

-8,797

4,977

951

2,457

14,204

3,573

1,027

154

6,117

1,229

8,046

-18,520

-406

-1,009

-31,362

-2,822

228,383

-131,300

-39,634

-11,171

-11,225

-193,330

-136,786

228,383

-193,330

-136,786

228,408

-193,199

-136,563

154

-60

-1,316

11,357

-59,659

52

-239,919

252,918

137,827

Preferred stock dividends

'

'

'

'

'

0

'

-755

'

-1,798

-1,528

-2,743

'

-755

-1,798

-1,528

-2,743

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income available to common stockholders

'

'

'

'

'

$7,562

'

($1,507)

'

($9,409)

$10,880

($11,602)

$12,716

($1,507)

($9,409)

$16,034

($11,602)

$7,362

($699)

($7,565)

$10,775

($8,797)

$4,977

$951

$2,457

$14,204

$3,573

$1,027

$154

$6,117

$1,229

$8,046

($18,520)

($406)

($1,009)

($31,362)

($2,822)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recovered_Sheet6

Senior Notes and Secured Indebtedness - Condensed Consolidating Statement of Cash Flows (Detail) (USD $)

7 Months Ended

9 Months Ended

10 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Delaware Lyon [Member]

Delaware Lyon [Member]

California Lyon [Member]

California Lyon [Member]

California Lyon [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Eliminating Entries [Member]

Operating activities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net cash (used in) provided by operating activities

$55,989

($164,919)

$49,993

($14,494)

($142,959)

($72,014)

$2,546

$12,221

$3,579

$67,937

($34,181)

$118,428

'

'

'

($17,321)

($38,651)

$24,119

'

'

($13,638)

$127,757

$27,863

$181

$87

($1,245)

($3,864)

($166,495)

($2,499)

'

'

'

Investing activities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash paid for acquisitions, net

'

'

-33,201

'

'

-33,201

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investment in and advances to unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-194

'

'

'

'

-194

'

'

'

'

'

'

'

'

'

Distributions from unconsolidated joint venture

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,435

4,183

'

'

'

1,435

4,183

'

'

'

'

'

'

'

'

'

Purchases of property and equipment

-53

-3,359

-312

-24

-3,299

-271

-13

-57

-20

-16

-3

-21

'

'

'

0

-128

-64

'

'

-419

725

101

-3

-131

-165

422

-722

'

'

'

'

Investments in subsidiaries

0

0

0

-3,837

4,804

-84,828

'

'

'

'

'

'

3,837

-4,804

84,828

0

0

0

'

'

183

29,412

-361

'

'

12

'

'

'

-183

-29,412

349

Net cash (used in) provided by investing activities

-53

-3,359

-33,513

-3,861

1,505

-118,300

-13

-57

-20

-16

-3

-21

3,837

-4,804

84,828

0

1,307

3,925

0

0

-236

31,572

3,729

-3

-131

-153

422

-722

'

-183

-29,412

349

Financing activities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from borrowings on notes payable

'

51,444

13,248

'

16,790

7,809

'

1,762

'

'

32,892

5,439

'

'

'

'

'

7,087

'

'

'

'

7,087

'

'

'

'

'

'

'

'

'

Proceeds from issuance of 8 1/2% Senior Notes

'

'

325,000

'

'

325,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Principal payments on notes payable

-62,557

-45,459

-73,676

-4,157

-26,360

-3,994

'

'

'

-58,400

-19,099

-69,682

'

'

'

-616

-11,532

-52,797

'

'

-116

-82,531

-52,797

'

'

'

-500

70,999

'

'

'

'

Principal payments on Senior Secured Term Loan

'

'

-235,000

'

'

-235,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from reorganization

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30,971

'

'

'

'

30,971

'

'

'

'

'

'

'

'

'

'

'

Net cash paid for repurchase of Senior Notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-31,268

'

'

'

'

-31,268

'

'

'

'

'

'

'

'

'

Principal payments on Senior Subordinated Secured Notes

'

'

-75,916

'

'

-75,916

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of convertible preferred stock

'

'

14,000

'

'

14,000

'

'

'

'

'

'

'

'

'

50,000

'

'

'

'

50,000

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of common stock

'

179,438

16,000

'

179,438

16,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from debtor in possession financing

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,000

'

'

'

'

5,000

'

'

'

'

'

'

'

'

'

'

'

Principal payment of debtor in possession financing

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-5,000

'

'

'

'

-5,000

'

'

'

'

'

'

'

'

'

'

'

Payment of deferred loan costs

'

-1,792

-7,181

'

-1,792

-7,181

'

'

'

'

'

'

'

'

'

-2,491

'

'

'

'

-2,491

'

'

'

'

'

'

'

'

'

'

'

Offering costs related to issuance of common stock

'

-15,655

'

'

-15,655

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment of preferred stock dividends

-1,114

-2,550

-1,721

-1,114

-2,550

-1,721

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling interest contributions

17,021

35,399

15,313

'

'

'

'

'

'

17,021

35,399

15,313

'

'

'

1,825

6,605

6,546

'

'

'

'

'

'

'

'

1,825

6,605

6,546

'

'

'

Noncontrolling interest distributions

-15,373

-21,700

-16,004

'

'

'

'

'

'

-15,373

-21,700

-16,004

'

'

'

-1,897

-8,954

-3,913

'

'

'

'

'

'

'

'

-1,897

-8,954

-3,913

'

'

'

Advances to affiliates

0

0

0

'

'

'

1

-776

3

-3,306

7,768

78,817

3,305

-6,992

-78,820

0

0

0

'

'

'

'

'

'

-3

-19

-4

-29,341

-744

4

29,344

763

Intercompany receivables/payables

0

0

0

19,087

183

144,535

-2,530

-12,902

-3,549

-9,415

923

-134,978

-7,142

11,796

-6,008

0

0

0

'

'

-2,665

-131,964

-362

-173

-37

1,437

2,659

131,933

37

179

68

-1,112

Net cash (used in) provided by financing activities

-62,023

179,125

-25,937

13,816

150,054

183,532

-2,529

-11,916

-3,546

-69,473

36,183

-121,095

-3,837

4,804

-84,828

77,792

-13,881

-74,345

0

0

75,699

-214,495

-77,340

-173

-40

1,418

2,083

171,242

1,926

183

29,412

-349

Net (decrease) increase in cash and cash equivalents

-6,087

10,847

-9,457

-4,539

8,600

-6,782

4

248

13

-1,552

1,999

-2,688

0

0

0

60,471

-51,225

-46,301

0

0

61,825

-55,166

-45,748

5

-84

20

-1,359

4,025

-573

0

0

0

Cash and cash equivalents - beginning of period

80,532

71,075

80,532

76,158

69,376

76,158

52

65

52

4,322

1,634

4,322

'

0

'

20,061

71,286

117,587

0

'

14,333

69,499

115,247

47

131

111

5,681

1,656

2,229

0

0

'

Cash and cash equivalents - end of period

$74,445

$81,922

$71,075

$71,619

$77,976

$69,376

$56

$313

$65

$2,770

$3,633

$1,634

$0

$0

$0

$80,532

$20,061

$71,286

$0

$0

$76,158

$14,333

$69,499

$52

$47

$131

$4,322

$5,681

$1,656

$0

$0

$0

Recovered_Sheet7

Fair Value Of Financial Instruments (Narrative) (Detail) (Predecessor [Member], Senior Secured Term Loan [Member], USD $)	Dec. 31, 2011
Predecessor [Member] | Senior Secured Term Loan [Member]	'
Fair Value Measurements Of Financial Instruments [Line Items]	'
Senior Secured Debt, Carrying Amount	$206,000,000
Senior Secured Debt, Fair value	$235,000,000

Recovered_Sheet8

Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Detail) (USD $)

Feb. 24, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2011

In Thousands, unless otherwise specified

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Senior Secured Term Loan Due 2015

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

8 1/2% Senior Notes due November 15, 2020 [Member]

Senior Secured Term Loan Due 2015

7 5/8% Senior Notes due December 15, 2012 [Member]

10 3/4% Senior Notes due April 1, 2013 [Member]

7 1/2% Senior Notes due February 15, 2014 [Member]

Financial liabilities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable, Carrying Amount

'

'

$35,471

$13,248

'

'

'

'

'

'

$74,009

'

'

'

'

'

Senior Notes, Carrying Amount

283,500

283,483

'

325,000

325,000

325,000

'

'

'

'

489,483

'

'

66,704

138,912

77,867

Senior Secured Debt, Carrying Amount

'

'

'

'

'

'

'

'

'

'

'

'

206,000

'

'

'

Notes payable, Fair Value

'

'

35,471

13,248

'

'

'

'

'

'

74,009

'

'

'

'

'

Senior Notes, Fair Value

'

'

'

'

342,875

338,000

'

'

'

'

'

'

'

20,469

40,614

21,742

Senior Secured Debt, Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

$235,000

'

'

'

Fair_Value_Of_Financial_Instru2

Fair Value Of Financial Instruments (Fair Value Of Debt) (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Notes Payable [Member]	'		'
Fair Value Measurements Of Financial Instruments [Line Items]	'		'
Fair Value at December 31, 2011 (Predecessor)	$13,248		$74,009
Change in balance related to plan of reorganization	'		'	[1]
Repayments of principal	-45,459	[2]	-74,009	[2]
Borrowings of principal	67,682	[3]	13,248	[3]
Increase in value during the period	'		'
Fair Value at December 31, 2012 (Successor)	35,471		13,248
Senior Secured Term Loan [Member]	'		'
Fair Value Measurements Of Financial Instruments [Line Items]	'		'
Fair Value at December 31, 2011 (Predecessor)	'		235,000
Change in balance related to plan of reorganization	'		'	[1]
Repayments of principal	'		-235,000	[2]
Borrowings of principal	'		'	[3]
Increase in value during the period	'		'
Fair Value at December 31, 2012 (Successor)	'		'
[1]	Change is representative of payoff of the loan for the value reported at December 31, 2011, and not the face amount of the notes that were eliminated in accordance with the joint plan of reorganization.
[2]	Represents the actual amount of principal repaid
[3]	Represents the actual amount of principal borrowed

Fair_Value_Of_Financial_Instru3

Fair Value Of Financial Instruments (Summary Of Fair-Value Measurements Of Non-Financial Assets) (Detail) (Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2011
Land Under Development And Homes Completed And Under Construction [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Fair Value at Measurement Date	$94,751	[1],[2]
Impairment Charges	34,835	[1],[2]
Inventory Held For Future Development [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Fair Value at Measurement Date	74,146	[1],[3]
Impairment Charges	$93,479	[1],[3]
[1]	Amounts represent the aggregate fair values for communities where the Company recognized noncash inventory impairment charges during the year ended December 31, 2011.
[2]	In accordance with FASB ASC 360-10-35, inventory under this caption with a carrying value of $129.6 million was written down to its fair value of $94.8 million, resulting in total impairments of $34.8 million for the year ended December 31, 2011.
[3]	In accordance with FASB ASC 360-10-35, inventory under this caption with a carrying value of $167.6 million was written down to its fair value of $74.1 million, resulting in total impairments of $93.5 million for the year ended December 31, 2011.

Fair_Value_Of_Financial_Instru4

Fair Value Of Financial Instruments (Summary Of Fair-Value Measurements Of Non-Financial Assets) (Parenthetical) (Detail) (Level 3 [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2011
Land Under Development And Homes Completed And Under Construction [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Carrying value of inventory	$129.60
Fair value of inventory	94.8
Total impairments charges	34.8
Inventory Held For Future Development [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Carrying value of inventory	167.6
Fair value of inventory	74.1
Total impairments charges	$93.50

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	1 Months Ended		2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended
	Mar. 31, 2011	Sep. 03, 2009	Feb. 24, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Reimbursable on-site labor costs	'	'	$27,000	$0	$77,000	$254,000	$1,000	$276,000	'	$318,000	$217,000
Reimbursable on-site labor costs due	'	'	'	200	'	'	200	7,000	7,000	24,000	'
Base monthly fee	21,335	'	'	'	'	'	21,335	'	'	'	'
Variable monthly fee	23	'	'	'	'	'	23	'	'	'	'
Variable monthly fee multiplied by number of employees	8,000	'	'	'	'	'	8,000	'	'	'	'
Fees related to Human resource and Payroll Service Contract	'	'	52,000	'	59,000	179,000	'	180,000	'	362,000	426,000
Contract expiry date	'	'	'	'	'	'	31-Aug-12	'	31-Aug-12	'	'
Aggregate purchase price of aircraft	'	8,300,000	'	'	'	'	'	'	'	'	'
Cash paid on sale of aircraft	'	2,100,000	'	'	'	'	'	'	'	'	'
Promissory note from the affiliate	'	6,200,000	'	'	'	'	'	'	'	'	'
Adjusted fair value	'	5,200,000	'	'	'	'	'	'	'	'	'
Semiannual interest payments received	'	132,000	'	'	'	'	'	'	'	'	'
Note maturity date	'	30-Sep-16	'	'	'	'	'	'	'	'	'
Charges related to the rent expense	'	'	118,000	'	197,000	472,000	197,000	668,000	'	786,000	786,000
Current lease expiry date	'	'	'	'	'	'	31-Mar-13	'	31-Mar-13	'	'
Subsequent Event [Member]	'	'	'	'	'	'	'	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Semiannual interest payments received	'	$132,000	'	'	'	'	'	'	'	'	'

Income_Taxes_Summary_Of_Provis

Income Taxes (Summary Of (Provision) Benefit (From) Income Taxes) (Detail) (USD $)	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010
	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
Current	'	'	'	'	'	'	'	'
Interest on uncertain tax provisions	'	'	'	'	'	$0	'	$75
Federal	'	'	'	'	'	0	'	347
State	'	'	'	'	-11	0	-10	-10
(Provision) benefit from income taxes	($6,356)	($11)	($11)	($6,366)	($11)	$0	($10)	$412

Income_Taxes_Difference_In_Inc

Income Taxes (Difference In Income Taxes From Amounts Computed By Applying Federal Statutory Rates Recorded) (Detail) (USD $)	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Dec. 31, 2010
	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]
Deferred Income Tax Assets And Liabilities [Line Items]	'	'	'	'	'	'	'	'
Benefit (provision) for federal income taxes at the statuatory rate	'	'	'	'	$3,098	($79,935)	$67,662	$48,019
Provision for state income taxes, net of federal income tax benefits	'	'	'	'	-7	'	-6	-6
Valuation allowance	'	'	'	'	-2,195	-14,991	-66,265	-47,949
Nondeductible items-reorganization costs	'	'	'	'	-709	94,925	-1,379	'
Nondeductible items-other	'	'	'	'	-194	-3	-22	'
Other	'	'	'	'	-4	4	'	348
(Provision) benefit from income taxes	($6,356)	($11)	($11)	($6,366)	($11)	$0	($10)	$412

Income_Taxes_Summary_Of_Tempor

Income Taxes (Summary Of Temporary Differences Giving Rise To Deferred Income Taxes) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets	'	'	'	'
Impairment and other reserves	'	$73,947,000	$102,216,000	'
Compensation deductible for tax purposes when paid	'	987,000	970,000	'
State income tax provisions deductible when paid for federal tax purposes	'	4,000	3,000	'
Effect of book/tax differences for joint ventures	'	1,002,000	1,563,000	'
Effect of book/tax differences for capitalized interest/general and administrative	'	'	891,000	'
Other	'	318,000	318,000	'
AMT credit carryover	'	2,698,000	2,698,000	'
Unused recognized built-in loss	'	16,349,000	'	'
Net operating loss	'	113,314,000	99,586,000	'
Valuation allowance	-117,000,000	-200,048,000	-202,322,000	-125,800,000
Deferred tax assets	'	8,571,000	5,923,000	'
Deferred tax liabilities	'	'	'	'
Effect of book/tax differences for joint ventures	'	-5,597,000	-5,923,000	'
Effect of book/tax differences for capitalized interest/general and administrative	'	-2,974,000	'	'
Deferred tax liabilities	'	-8,571,000	-5,923,000	'
Deferred income taxes	'	'	'	'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)

1 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

Feb. 24, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2010

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

21-May-13

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

Feb. 24, 2012

Sep. 30, 2013

State [Member]

State [Member]

Federal [Member]

Federal [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Second Lien Notes [Member]

Second Lien Notes [Member]

Income Taxes [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating loss carry forwards

'

'

'

'

'

'

'

'

'

$508,300,000

'

$243,800,000

'

'

'

'

'

'

Year in which net operating loss carry forwards begin to expire

'

'

'

'

'

'

'

'

'2015

'2013

'

'2028

'

'

'

'

'

'

Unused built-in losses available to offset future income

'

'

'

'

'

'

'

'

37,300,000

27,900,000

59,600,000

42,100,000

'

'

'

'

'

'

Unused built in losses available to offset future income expiration Period

'

'

'

'

'2017

'2017

'

'

'

'

'

'

'

'

'

'

'

'

Valuation allowance

'

117,000,000

'

'

117,000,000

200,048,000

125,800,000

202,322,000

'

'

'

'

'

'

'

'

'

'

Income tax refund receivable

'

'

'

'

'

'

75,000

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock

92,400,000

'

'

'

'

'

'

'

'

'

'

'

10,005,000

44,793,255

44,793,255

'

'

'

Common stock, par value

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

$0.01

$0.01

$0.01

'

'

Aggregate principal amount of senior secured notes

283,500,000

'

'

'

'

'

'

283,483,000

'

'

'

'

'

'

'

'

75,000,000

75,000,000

Interest rate of senior note

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12.00%

12.00%

Secured note maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'2017

'2017

Cancellation of Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

203,000,000

Operating loss carry forwards

'

'

'

'

'

'

'

'

$52,500,000

'

'

'

'

'

'

'

'

'

Testing period

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Year in which unused built-in loss carry-forwards begin to expire

'

'

'

'

'2033

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective Income Tax Rate Reconciliation, Percent

'

37.30%

0.00%

0.00%

26.90%

'

'

'

'

'

'

'

'

'

'

'

'

'

Business_Combination_Additiona

Business Combination - Additional Information (Detail) (Village Homes [Member], USD $)	1 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended
	Dec. 07, 2012	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2012
		Home		Home
Village Homes [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Percentage of variable entities acquired	100.00%	'	'	'
Cash paid for acquisitions	$33,201,000	'	'	'
Date of acquisition	'	7-Dec-12	'	7-Dec-12
Number of homes sold over the past 25 years	'	10,000	'	10,000
Acquisition related expenses	'	'	200,000	'
Home sales revenue	'	'	5,400,000	'
Net (loss) income attributable to William Lyon Homes	'	'	$10,000	'

Business_Combination_Schedule_

Business Combination (Schedule Of Assets And Liabilities Acquired) (Detail) (Village Homes [Member], USD $)	1 Months Ended
In Thousands, unless otherwise specified	Dec. 07, 2012
Village Homes [Member]	'
Business Acquisition [Line Items]	'
Real estate inventories owned	$32,923
Other assets, net	1,463
Intangibles	907
Receivables	70
Accounts payable	-1,029
Accrued expenses	-1,133
Cash paid for acquisitions, net	$33,201

Business_Combination_Schedule_1

Business Combination (Schedule Of Unaudited Pro Forma Information Prepared To Give Effect To Acquisition) (Detail) (Village Homes [Member], USD $)	3 Months Ended	7 Months Ended	10 Months Ended	2 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011
	Successor [Member]	Successor [Member]	Successor [Member]	Predecessor [Member]	Predecessor [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'	'	'
Revenue	$104,479	$283,090	$405,635	$28,521	$261,933
Net (loss) income available to common stockholders	($872)	($9,267)	($9,617)	$228,074	($189,457)
(Loss) income per common share, basic and diluted	($0.07)	($0.79)	($0.09)	$228,074	($189,457)
Weighted average common shares outstanding, basic and diluted	12,408,263	11,716,413	103,037,842	1,000	1,000

Income_Loss_Per_Common_Share_B

Income (Loss) Per Common Share - Basic and Diluted Income (Loss) Per Common Share (Detail) (USD $)

1 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

2 Months Ended

12 Months Ended

2 Months Ended

In Thousands, except Share data, unless otherwise specified

Mar. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2011

Dec. 31, 2010

Feb. 24, 2012

Feb. 24, 2012

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Preferred stock [Member]

Preferred stock [Member]

Preferred stock [Member]

Preferred stock [Member]

Preferred stock [Member]

Warrants [Member]

Warrants [Member]

Warrants [Member]

Warrants [Member]

Warrants [Member]

Vested stock options [Member]

Unvested stock options [Member]

Preferred stock [Member]

Warrants [Member]

Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basic weighted average number of common shares outstanding

'

30,975,160

'

12,408,263

'

11,716,413

22,569,810

103,037,842

'

'

'

'

'

'

'

'

'

'

'

'

1,000

1,000

1,000

'

'

Effect of dilutive securities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred shares, stock options, and warrants

'

920,654

'

0

[1]

'

0

[1]

877,144

0

[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Diluted average shares outstanding

'

31,895,814

'

12,408,263

'

11,716,413

23,446,954

103,037,842

'

'

'

'

'

'

'

'

'

'

'

'

1,000

1,000

1,000

'

'

Net (loss) income available to common stockholders

($5,351)

$7,562

($2,194)

($1,507)

($2,550)

($9,409)

$10,880

($11,602)

'

'

'

'

'

'

'

'

'

'

'

'

$228,383

($193,330)

($136,786)

'

'

Basic (loss) income per common share

'

'

'

'

'

'

'

($0.11)

'

'

'

'

'

'

'

'

'

'

'

'

$228,383

($193,330)

($136,786)

'

'

Basic income (loss) per common share

'

$0.24

'

($0.12)

'

($0.80)

$0.48

'

'

'

'

'

'

'

'

'

'

'

'

'

$228,383

'

'

'

'

Dilutive (loss) income per common share

'

'

'

'

'

'

'

($0.11)

'

'

'

'

'

'

'

'

'

'

'

'

$228,383

($193,330)

($136,786)

'

'

Dilutive income (loss) per common share

'

$0.24

'

($0.12)

'

($0.80)

$0.46

'

'

'

'

'

'

'

'

'

'

'

'

'

$228,383

'

'

'

'

Antidilutive securities not included in the calculation of diluted (loss) income per common share (weighted average):

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Antidilutive securities not included in the calculation of diluted (loss) income per common share (weighted average)

'

'

'

'

'

'

'

'

0

7,858,404

7,858,404

0

68,002,529

0

1,907,551

1,907,551

0

15,737,294

3,171,535

1,585,767

'

'

'

0

0

[1]

For periods with a net loss, all potentially dilutive shares related to the preferred shares, unvested common shares, and warrants were excluded from the diluted loss per common share calculations because the effect of their inclusion would be antidilutive, or would decrease the reported loss per common share.

[2]

For periods with a net loss, all potentially dilutive shares related to the preferred shares, options to acquire common stock, and warrants were excluded from the diluted loss per common share calculations because the effect of their inclusion would be antidilutive, or would decrease the reported loss per common share.

Redeemable_Convertible_Preferr1

Redeemable Convertible Preferred Stock (Narrative) (Detail) (USD $)	1 Months Ended	12 Months Ended		0 Months Ended	10 Months Ended	12 Months Ended		0 Months Ended
	Feb. 24, 2012	Dec. 31, 2012	Sep. 30, 2013	Oct. 12, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012	Oct. 12, 2012
				Paulson [Member]	Convertible preferred stock [Member]	Convertible preferred stock [Member]	Common stock, Class A [Member]	Common stock, Class A [Member]
								Paulson [Member]
Convertible Preferred Stock [Line Items]	'	'	'	'	'	'	'	'
Convertible Preferred Stock	'	'	'	'	64,831,831	64,831,831	'	'
Convertible Preferred Stock Par Value	'	'	$0.01	'	$0.01	$0.01	'	'
Convertible Preferred Stock, issued	'	'	'	12,173,913	77,005,744	77,005,744	'	'
Convertible Preferred Stock, outstanding, issued in exchange for aggregate cash consideration	$50,000,000	'	'	$14,000,000	'	$50,000,000	'	'
Convertible Preferred Stock value	'	'	'	'	56,400,000	56,400,000	'	'
Common stock, shares issued	'	'	'	'	'	'	44,793,255	15,238,095
Aggregate cash consideration	'	'	'	'	'	'	'	16,000,000
Aggregate purchase price	'	'	'	30,000,000	'	'	'	'
Preferred stock, shares authorized	'	'	10,000,000	'	80,000,000	80,000,000	'	'
Preferred stock cumulative dividend rate	'	'	'	'	6.00%	6.00%	'	'
Preferred stock cash dividends rate	'	'	'	'	'	4.00%	'	'
Preferred stock accreting dividends accruing rate	'	'	'	'	'	2.00%	'	'
Preferred stock dividends	'	'	'	'	2,700,000	'	'	'
Preferred stock cash dividends	'	'	'	'	1,700,000	'	'	'
Accreting dividends	'	'	'	'	'	900,000	'	'
Preferred stock redemption term	'	'As of December 31, 2012, the preferred stock is not currently redeemable and ultimate redemption is not currently probable, since the redemption would only occur if the preferred stock is still outstanding in 15 years.	'	'	'	'	'	'
Redeemable convertible preferred stock, redemption value	'	64,000,000	'	'	'	'	'	'
Redeemable convertible preferred stock, accreted dividends	'	$900,000	'	'	'	'	'	'

Equity_Narrative_Detail

Equity (Narrative) (Detail) (USD $)

1 Months Ended

10 Months Ended

12 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

0 Months Ended

Jun. 28, 2012

Feb. 24, 2012

Dec. 31, 2012

Dec. 31, 2012

Oct. 12, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2012

Feb. 24, 2012

Dec. 31, 2012

Sep. 30, 2013

31-May-13

21-May-13

Dec. 31, 2012

Sep. 30, 2013

31-May-13

21-May-13

Feb. 24, 2012

Oct. 12, 2012

Dec. 31, 2012

Dec. 31, 2012

Property

Paulson [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Warrants [Member]

Common Stock [Member]

acre

Five-Year Options [Member]

Ten-Year Options [Member]

Paulson [Member]

Convertible Preferred Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares outstanding

'

'

120,105,557

120,105,557

'

'

'

'

'

3,120,000

2,499,293

'

'

16,020,338

'

16,020,338

'

31,464,548

'

3,813,885

3,813,884

70,121,378

'

27,623,629

27,623,629

'

'

'

120,105,557

Common stock, shares issued

'

'

'

'

'

'

'

'

'

'

'

'

'

12,966,366

'

12,966,366

'

31,464,548

'

'

'

44,793,255

'

'

'

'

15,238,095

'

'

Common stock, par value

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

$0.01

$0.01

$0.01

$0.01

$0.01

$0.01

'

'

$0.01

$0.01

'

'

$0.01

'

'

'

Conversion of common stock, shares issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

90,028

'

'

'

'

'

'

'

Aggregate cash consideration

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$60,000,000

$10,000,000

$25,000,000

$25,000,000

'

'

'

'

'

'

'

'

$16,000,000

'

'

Common stock, shares issued to purchase warrants

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,737,294

'

'

'

'

'

'

'

'

'

'

'

Warrants to purchase common stock price per share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2.07

'

'

'

'

'

'

'

'

'

'

'

Issuance of additional common stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,144,000

3,144,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares converted

'

'

'

'

'

'

'

'

'

'

'

'

'

90,028

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Area of property

165

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of properties for sale

7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate purchase price of the property

21,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash paid

11,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of lots

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share issued to acquire the property

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options to purchase shares

'

'

'

'

'

'

'

'

'

4,757,302

'

1,115,302

3,642,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted shares granted

'

'

2,499,293

2,499,293

'

256,500

0

40,998

256,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Preferred Stock, issued

'

'

'

'

12,173,913

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Preferred Stock, outstanding, issued in exchange for aggregate cash consideration

'

50,000,000

'

'

14,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate purchase price

'

81,000,000

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion rate

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

1

'

1

'

'

'

'

'

'

'

'

'

'

'

Market value of common stock

'

43,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants expiration date

'

'

'

'2017-02-24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adoption of fresh start accounting

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,000,000

'

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)

2 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

10 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

10 Months Ended

Feb. 24, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Five-Year Options [Member]

Ten-Year Options [Member]

Common stock, Class D [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Balance of lots still under option and not purchased [Member]

Balance of lots still under option and not purchased [Member]

Loss Contingencies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,699,565

'

'

'

'

Restricted shares granted

'

'

'

'

'

2,499,293

2,499,293

'

'

'

'

'

'

256,500

0

40,998

256,500

'

'

'

'

'

'

'

Stock options granted

'

'

'

'

'

'

4,757,302

'

'

'

'

'

'

'

'

'

'

1,115,302

3,642,000

'

'

'

'

'

Remaining vesting percentage in three equal installments

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting percentage of restricted stock and option awards on date of grant

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock based compensation expense

'

$900,000

'

'

$2,200,000

$3,700,000

'

$0

$0

'

'

'

'

'

'

'

'

'

'

'

$2,207,000

$3,699,000

'

'

Expected stock based compensation expense, thereafter

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized stock based compensation expense

'

'

'

'

'

2,000,000

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized stock based compensation expense, weighted average recognition period

'

'

'

'

'

'

'2 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total value of restricted stock awards vested

'

'

'

'

'

1,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recognized tax benefit

0

'

'

'

'

0

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rent expense under cancelable and non-cancelable operating leases

700,000

400,000

700,000

2,100,000

1,300,000

2,600,000

'

4,400,000

4,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Collateral for outstanding irrevocable

'

900,000

'

'

900,000

900,000

900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding performance and surety bonds

'

48,400,000

'

'

48,400,000

64,400,000

64,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Project commitments

'

92,400,000

'

'

92,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-refundable deposits

'

25,400,000

'

'

25,400,000

3,800,000

3,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining purchase price of land

'

238,600,000

'

'

238,600,000

39,000,000

39,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-refundable deposit

'

'

'

'

'

'

'

'

'

15.00%

15.00%

25.00%

25.00%

'

'

'

'

'

'

'

'

'

'

'

Forfeited deposits if lots are not purchased

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14,737,000

27,734,000

Purchase price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$161,465,000

$161,465,000

$20,738,000

$39,029,000

Stock_Based_Compensation_Weigh

Stock Based Compensation (Weighted-Average Assumptions For Fair Value Of Employee Options Granted) (Detail)	10 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	0.00%	'	'
Risk-free interest rate	0.55%	'	'
Expected volatility	79.00%	'	'
Expected life (in years)	'4 years 8 months 23 days	'	'

Stock_Based_Compensation_Sched

Stock Based Compensation (Schedule Of Stock Option Activity) (Detail) (USD $)	10 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'		'
Options, Granted	4,757,302	[1]	'
Options, Exercised	'		'
Options, Cancelled	'		'
Options outstanding at end of year	4,757,302		4,757,302
Options vested and expected to vest	4,757,302		4,757,302
Options exercisable at end of year	3,171,535	[2]	3,171,535	[2]
Options, Price range of options exercised	'		'
Options, Price range of options outstanding	$1.05		'
Total shares available for future grants at end of year	6,442,970		6,442,970
Weighted Average Exercise Price, Granted	$1.05	[1]	'
Weighted Average Exercise Price, Exercised	'		'
Weighted Average Exercise Price, Cancelled	'		'
Weighted Average Exercise Price, Options outstanding at end of year	$1.05		$1.05
Weighted Average Exercise Price, Options vested and expected to vest	$1.05		$1.05
Weighted Average Exercise Price, Options exercisable at end of year	$1.05	[2]	$1.05	[2]
Weighted Average Remaining Contractual Life (in years), Granted	'4 years 5 months 23 days	[1]	'
Weighted Average Remaining Contractual Life (in years), Options outstanding at end of year	'4 years 5 months 23 days		'
Weighted Average Remaining Contractual Life (in years), Options vested and expected to vest	'4 years 5 months 23 days		'
Weighted Average Remaining Contractual Life (in years), Options exercisable at end of year	'4 years 5 months 23 days	[2]	'
Aggregate Intrinsic Value, Options outstanding at beginning of year	'		'
Aggregate Intrinsic Value, Granted	'	[1]	'
Aggregate Intrinsic Value, Exercised	'		'
Aggregate Intrinsic Value, Cancelled	'		'
Aggregate Intrinsic Value, Options outstanding at end of year	'		'
Aggregate Intrinsic Value, Options vested and expected to vest	'		'
Aggregate Intrinsic Value, Options exercisable at end of year	'	[2]	'	[2]
Weighted average grant date fair value of stock options	'		$0.64
Fair value of shares vested	$2		'
[1]	The weighted average grant date fair value of the stock options was $0.64.
[2]	The fair value of shares vested during the period from February 25, 2012 through December 31, 2012 was $2.0 million.

Stock_Based_Compensation_Summa

Stock Based Compensation (Summary Of Stock Options Granted To Executives, Directors, And Non-Executives That Are Vested And Expected To Vest In Periods) (Detail) (USD $)	10 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares	4,757,302
Weighted Average Exercise Price	$1.05
Weighted Average Remaining Contractual life (in years)	'4 years 5 months 23 days
Aggregate Intrinsic Value	'
Executives [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares	4,467,892
Weighted Average Exercise Price	$1.05
Non-Executives [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares	289,410
Weighted Average Exercise Price	$1.05

Stock_Based_Compensation_Summa1

Stock Based Compensation (Summary Of Stock Options Granted To Executives, Directors, And Non-Executives That Are Exercisable) (Detail) (USD $)	10 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares	3,171,535	[1]
Weighted Average Exercise Price	$1.05	[1]
Weighted Average Remaining Contractual Life (in years)	'4 years 5 months 23 days	[1]
Aggregate Intrinsic Value	'	[1]
Executives [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares	2,978,595
Weighted Average Exercise Price	$1.05
Aggregate Intrinsic Value	'
Directors [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Aggregate Intrinsic Value	'
Non-Executives [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares	192,940
Weighted Average Exercise Price	$1.05
Aggregate Intrinsic Value	'
[1]	The fair value of shares vested during the period from February 25, 2012 through December 31, 2012 was $2.0 million.

Stock_Based_Compensation_Summa2

Stock Based Compensation (Summary Of Nonvested (Restricted) Shares Activity) (Detail) (USD $)	10 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of Shares, Granted	2,499,293	2,499,293
Number of Shares, Vested	1,592,965	'
Number of Shares, Cancelled	'	'
Number of Shares, Non-vested shares at end of year	906,328	906,328
Weighted Average Grant Date Fair Value, Granted	$1.05	'
Weighted Average Grant Date Fair Value, Vested	$1.05	'
Weighted Average Grant Date Fair Value, Cancelled	$1.05	'
Weighted Average Grant Date Fair Value, Non-vested shares at end of year	$1.05	$1.05

Recovered_Sheet9

Commitments And Contingencies (Narrative) (Detail) (USD $)	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Feb. 24, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
							M
Contingencies And Commitments [Line Items]	'	'	'	'	'	'	'	'	'
Rent expense under cancelable and non-cancelable operating leases	$0.70	$0.40	$0.70	$2.10	$1.30	$2.60	'	$4.40	$4.40
Collateral for outstanding irrevocable	'	0.9	'	'	0.9	0.9	0.9	'	'
Term of letter of credit	'	'	'	'	'	'	12	'	'
Outstanding performance and surety bonds	'	48.4	'	'	48.4	64.4	64.4	'	'
Project commitments	'	92.4	'	'	92.4	'	'	'	'
Non-refundable deposits	'	25.4	'	'	25.4	3.8	3.8	'	'
Total purchase price	'	'	'	'	'	97.1	97.1	'	'
Remaining purchase price of land	'	238.6	'	'	238.6	39	39	'	'
Additional deposits	'	'	'	'	'	'	2.5	'	'
Real estate inventories not owned and liabilities from inventories not owned	'	'	'	'	'	'	2.5	'	'
Minimum [Member]	'	'	'	'	'	'	'	'	'
Contingencies And Commitments [Line Items]	'	'	'	'	'	'	'	'	'
Non-refundable deposit	'	15.00%	'	'	15.00%	15.00%	15.00%	'	'
Maximum [Member]	'	'	'	'	'	'	'	'	'
Contingencies And Commitments [Line Items]	'	'	'	'	'	'	'	'	'
Non-refundable deposit	'	25.00%	'	'	25.00%	25.00%	25.00%	'	'
Construction In Progress [Member]	'	'	'	'	'	'	'	'	'
Contingencies And Commitments [Line Items]	'	'	'	'	'	'	'	'	'
Project commitments	'	'	'	'	'	$60.90	$60.90	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies (Future Minimum Payments Under Non-Cancelable Operating Leases) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Contingencies And Commitments [Line Items]	'	'
2013	$370	$1,349
2014	1,393	1,260
2015	731	618
2016	671	556
2017	697	580
Thereafter	2,734	2,654
Total	$6,596	$7,017

Commitments_and_Contingencies_3

Commitments and Contingencies (Summary of Company's Consolidated Land Banking Arrangement) (Detail) (USD $)	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012		Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2011
In Thousands, unless otherwise specified	Location	Successor [Member]	Successor [Member]		Successor [Member]	Successor [Member]	Predecessor [Member]		Predecessor [Member]
		Lot	Lot		Balance of lots still under option and not purchased [Member]	Balance of lots still under option and not purchased [Member]	Lot		Balance of lots still under option and not purchased [Member]
		Project	Project		Lot	Lot	Project		Lot
Noncontrolling Interest [Line Items]	'	'	'		'	'	'		'
Total number of land banking projects	'	1	1		'	'	1		'
Number of lots	15	610	610	[1]	105	199	625	[1]	225
Purchase price	'	$161,465	$161,465		$20,738	$39,029	$161,465		'
Purchase price	'	'	'		'	39,029	'		47,408
Forfeited deposits if lots are not purchased	'	'	'		$14,737	$27,734	'		$25,234
[1]	Total number of lots in the land banking project was reduced by 15 as of December 31, 2012 as compared to December 31, 2011 because of a change in product mix in future projects.

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)

1 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

1 Months Ended

0 Months Ended

Feb. 24, 2012

Dec. 31, 2012

31-May-13

31-May-13

31-May-13

21-May-13

Feb. 24, 2012

Sep. 30, 2013

Dec. 31, 2012

31-May-13

Feb. 24, 2012

31-May-13

Dec. 31, 2012

31-May-13

Dec. 31, 2012

Sep. 30, 2012

31-May-13

31-May-13

Feb. 24, 2012

21-May-13

Dec. 31, 2012

Nov. 08, 2012

Oct. 24, 2013

Sep. 30, 2013

Sep. 30, 2013

Mar. 05, 2013

Warrants [Member]

Warrants [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class C [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

Convertible preferred stock [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

8 1/2% Senior Notes Due 2020 [Member]

CB&T Loan Agreement [Member]

CB&T Loan Agreement [Member]

Previous [Member]

IPO [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares issued in IPO by company and stockholder

'

'

'

'

'

'

'

'

'

10,005,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares issued

92,400,000

'

'

'

'

10,005,000

44,793,255

44,793,255

'

7,177,500

12,966,366

'

'

'

'

'

'

'

31,464,548

'

'

'

'

'

'

'

Shares issued by selling stockholder in IPO

'

'

'

'

'

'

'

'

'

2,827,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share price

'

'

'

'

'

'

'

'

'

$25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net proceeds of IPO net of underwriting discount and estimated offering expenses

'

'

'

'

'

$163,800,000

'

'

'

$165

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reverse stock split ratio

'

'

'

'

0.1212

'

'

'

'

'

'

'

'

'

'

'

'

0.1212

'

'

'

'

'

'

'

'

Conversion ratio

'

'

'

'

'

'

'

'

'

'

'

1

'

1

'

'

1

'

'

'

'

'

'

'

'

'

Common stock, shares outstanding X

'

120,105,557

'

'

27,623,629

27,623,629

'

'

70,121,378

'

'

'

16,020,338

'

2,499,293

3,120,000

'

3,813,885

'

3,813,884

31,464,548

'

'

'

'

'

Warrant term

'

'

'10 years

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants expiration date

'

'

24-Feb-22

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

325,000,000

100,000,000

'

'

'

Debt instrument, interest rate percentage

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8.50%

'

8.50%

'

'

Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

106.50%

'

'

'

Proceeds from Issuance of Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

104,700,000

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30,000,000

Credit facility, amount outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

'

Effect_of_Reverse_Stock_Split_

Effect of Reverse Stock Split (Detail) (USD $)

10 Months Ended

10 Months Ended

Dec. 31, 2012

31-May-13

21-May-13

Dec. 31, 2012

31-May-13

21-May-13

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class A [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class B [Member]

Common stock, Class C [Member]

Common stock, Class D [Member]

Common stock, Class D [Member]

After Stock Split [Member]

After Stock Split [Member]

After Stock Split [Member]

After Stock Split [Member]

After Stock Split [Member]

Common stock, Class A [Member]

Common stock, Class B [Member]

Common stock, Class C [Member]

Common stock, Class D [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock

120,105,557

27,623,629

27,623,629

70,121,378

3,813,885

3,813,884

31,464,548

16,020,338

2,499,293

3,120,000

14,558,246

8,499,558

3,813,885

1,941,859

302,945

(Loss) income per common share, basic and diluted

($0.11)

'

'

'

'

'

'

'

'

'

($0.93)

'

'

'

'

Weighted average common shares outstanding, basic and diluted

103,037,842

'

'

'

'

'

'

'

'

'

12,489,435

'

'

'

'

Unaudited_Summarized_Quarterly2

Unaudited Summarized Quarterly Financial Information (Summarized Unaudited Quarterly Financial Information) (Detail) (USD $)	10 Months Ended	2 Months Ended	3 Months Ended				12 Months Ended		1 Months Ended	3 Months Ended				7 Months Ended	9 Months Ended	10 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Feb. 24, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
		Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Predecessor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]
Quarterly Financial Data [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Sales	'	$16,687	$58,983	$53,703	$57,795	$36,574	'	'	$15,109	'	$102,833	$85,942	$145,051	'	'	'
Cost of sales	'	-14,598	-59,072	-46,645	-51,121	-31,885	'	'	-13,063	'	-82,859	-70,795	-131,272	'	'	'
Gross profit (loss)	'	2,089	-89	7,058	6,674	4,689	'	'	2,046	'	19,974	15,147	13,779	'	'	'
Other income, costs and expenses, net	'	226,408	-130,837	-46,758	-17,759	-15,866	'	'	-7,028	'	-21,262	-14,681	-14,836	'	'	'
Net (loss) income	'	228,497	-130,926	-39,700	-11,095	-11,177	-192,898	-135,455	-4,982	10,680	-1,288	466	-1,057	-5,573	17,287	-6,861
Net income (loss) available to common stockholders	'	228,383	'	'	'	'	-193,330	-136,786	-5,351	7,562	-2,194	-1,507	-2,550	-9,409	10,880	-11,602
Net loss attributable to William Lyon Homes	'	$228,383	($131,300)	($39,634)	($11,171)	($11,225)	($193,330)	($136,786)	'	$7,562	'	($752)	'	($7,611)	$12,408	($8,859)
Income (loss) per common share, basic and diluted	($0.11)	$228,383	($131,300)	($39,634)	($11,171)	($11,225)	($193,330)	($136,786)	($0.06)	'	($0.02)	($0.01)	($0.03)	'	'	($0.11)

Segment_Information_Segment_Fi1

Segment Information - Segment Financial Information Relating to Operations (Parenthetical) (Detail) (Successor [Member], USD $)	3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
Successor [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
(Provision) benefit for income taxes	($6,356)	($11)	($11)	($6,366)	($11)

Stock_Based_Compensation_Addit

Stock Based Compensation - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

10 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Non Employee Director [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Non Employee Director [Member]

Performance based restricted stock [Member]

Restricted stock [Member]

Non Employee Director [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of restricted stock, Shares

3,996

80,284

'

'

'

'

'

'

'

'

'

'

Issuance of stock, shares

'

'

2,499,293

2,499,293

'

'

256,500

0

40,998

256,500

291,444

'

Compensation expense recognized

'

$1,000,000

'

'

'

'

'

'

'

'

'

'

Restricted stock awards, vesting percentage

'

50.00%

'

'

'

'

'

25.00%

'

'

'

25.00%

Stock based compensation expense

$900,000

$2,200,000

$3,700,000

'

$0

$0

'

'

'

'

'

'