Enstar Group Limited (ESGR) 10-K3 Mar 142013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2013	Jun. 28, 2013	Mar. 02, 2014	Feb. 24, 2014
	Dec. 31, 2013	Jun. 28, 2013	Share Capital - Ordinary Shares [Member]	Non-Voting Convertible Ordinary Shares [Member]
Document Information [Line Items]	'	'	'	'
Document Type	'10-K	'	'	'
Amendment Flag	'false	'	'	'
Document Period End Date	31-Dec-13	'	'	'
Document Fiscal Year Focus	'2013	'	'	'
Document Fiscal Period Focus	'FY	'	'	'
Trading Symbol	'ESGR	'	'	'
Entity Registrant Name	'Enstar Group LTD	'	'	'
Entity Central Index Key	'0001363829	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'	'
Entity Current Reporting Status	'Yes	'	'	'
Entity Voluntary Filers	'No	'	'	'
Entity Filer Category	'Large Accelerated Filer	'	'	'
Entity Common Stock, Shares Outstanding	'	'	13,903,380	2,725,637
Entity Public Float	'	$1.17	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS	'	'
Short-term investments, trading, at fair value	$281,002	$319,111
Short-term investments, available-for-sale, at fair value (amortized cost: 2013 - $32,477; 2012 - $nil)	32,504	'
Fixed maturities, trading, at fair value	3,381,719	2,253,210
Fixed maturities, held-to-maturity, at amortized cost	859,387	'
Fixed maturities, available-for-sale, at fair value (amortized cost: 2013 - $210,825; 2012 - $245,396)	213,860	251,121
Equities, trading, at fair value	182,033	114,588
Other investments, at fair value	569,293	414,845
Total investments	5,519,798	3,352,875
Cash and cash equivalents	643,841	654,890
Restricted cash and cash equivalents	397,657	299,965
Accrued interest receivable	38,864	22,932
Accounts receivable	75,351	15,399
Premiums receivable	111,748	'
Income taxes recoverable	5,481	8,632
Deferred tax assets	34,295	8,109
Reinsurance balances recoverable	1,363,819	1,122,919
Funds held by reinsured companies	237,789	365,252
Goodwill and intangible assets	150,071	21,222
Other assets	41,441	6,066
TOTAL ASSETS	8,620,155	5,878,261
LIABILITIES	'	'
Losses and loss adjustment expenses	4,219,905	3,650,127
Policy benefits for life and annuity contracts	1,273,100	11,027
Unearned premium	70,698	'
Insurance and reinsurance balances payable	281,028	143,123
Accounts payable and accrued liabilities	97,103	73,258
Income taxes payable	23,721	19,073
Deferred tax liabilities	53,328	14,454
Loans payable	452,446	107,430
Other liabilities	70,444	84,536
TOTAL LIABILITIES	6,541,773	4,103,028
COMMITMENTS AND CONTINGENCIES	'	'
REDEEMABLE NONCONTROLLING INTEREST	100,859	'
SHAREHOLDERS' EQUITY	'	'
Treasury shares at cost (Series A non-voting convertible ordinary shares 2013: 2,972,892; 2012: 2,972,892)	-421,559	-421,559
Additional paid-in capital	962,145	958,571
Accumulated other comprehensive income	13,978	24,439
Retained earnings	1,181,457	972,853
Total Enstar Group Limited Shareholders' Equity	1,755,523	1,553,755
Noncontrolling interest	222,000	221,478
TOTAL SHAREHOLDERS' EQUITY	1,977,523	1,775,233
TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND SHAREHOLDERS' EQUITY	8,620,155	5,878,261
Share Capital - Ordinary Shares [Member]	'	'
SHAREHOLDERS' EQUITY	'	'
Ordinary shares	13,803	13,752
Series A Non-Voting Convertible Ordinary Shares [Member]	'	'
SHAREHOLDERS' EQUITY	'	'
Ordinary shares	2,973	2,973
TOTAL SHAREHOLDERS' EQUITY	2,973	2,973
Series C Non-Voting Convertible Ordinary Shares [Member]	'	'
SHAREHOLDERS' EQUITY	'	'
Ordinary shares	2,726	2,726
TOTAL SHAREHOLDERS' EQUITY	$2,726	$2,726

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Short-term investments, available-for-sale, at fair value, amortized cost	$32,477	'
Fixed maturities, available-for-sale, at fair value, amortized cost	$210,825	$245,396
Common shares, par value	$1	$1
Common shares, authorized	156,000,000	156,000,000
Share Capital - Ordinary Shares [Member]	'	'
Ordinary shares, shares issued	13,802,706	13,752,172
Ordinary shares, shares outstanding	13,802,706	13,752,172
Series A Non-Voting Convertible Ordinary Shares [Member]	'	'
Ordinary shares, shares issued	2,972,892	2,972,892
Treasury shares at cost (Series A non-voting convertible ordinary shares)	2,972,892	2,972,892
Series C Non-Voting Convertible Ordinary Shares [Member]	'	'
Ordinary shares, shares issued	2,725,637	2,725,637
Ordinary shares, shares outstanding	2,725,637	2,725,637

Consolidated_Statements_of_Ear

Consolidated Statements of Earnings (USD $)	3 Months Ended												12 Months Ended
Consolidated Statements of Earnings (USD $)	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	'	'	'	'	'	'	'	'	'	'	'	'	$239,807,000	$3,511,000	$3,543,000
Fees and commission income	5,012,000	2,398,000	2,960,000	2,447,000	2,657,000	1,944,000	1,775,000	2,194,000	10,154,000	1,623,000	2,045,000	4,036,000	12,817,000	8,570,000	17,858,000
Net investment income	23,071,000	25,009,000	27,252,000	17,963,000	16,765,000	19,658,000	20,894,000	20,443,000	15,571,000	18,498,000	19,059,000	15,548,000	93,295,000	77,760,000	68,676,000
Net realized and unrealized gains	31,440,000	37,010,000	-27,919,000	30,120,000	18,259,000	28,280,000	1,691,000	25,382,000	2,231,000	-8,512,000	9,133,000	6,362,000	70,651,000	73,612,000	9,214,000
Gain on bargain purchase	'	'	'	'	'	'	'	'	'	'	'	13,105,000	'	'	13,105,000
Total income	133,399,000	123,091,000	77,889,000	82,191,000	38,500,000	50,704,000	25,256,000	48,993,000	29,036,000	12,801,000	31,508,000	39,051,000	416,570,000	163,453,000	112,396,000
Net reduction in ultimate losses and loss adjustment expense liabilities:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Losses incurred on current period premiums earned - non-life run-off	'	'	'	'	'	'	'	'	'	'	'	'	74,139,000	'	'
Losses incurred - active underwriting	'	'	'	'	'	'	'	'	'	'	'	'	19,352,000	'	'
Reduction in estimates of net ultimate losses	-134,068,000	-27,850,000	-48,500,000	-5,062,000	-97,895,000	-58,506,000	-58,417,000	-3,298,000	-173,924,000	-43,615,000	-28,079,000	-2,612,000	-215,480,000	-218,116,000	-248,230,000
Increase (reduction) in provisions for bad debt	7,464,000	-5,465,000	'	'	-329,000	'	-527,000	-2,255,000	-38,751,000	-2,399,000	-1,672,000	'	1,999,000	-3,111,000	-42,822,000
Reduction in provisions for unallocated loss adjustment expense liabilities	-111,000	-16,320,000	-16,795,000	-16,403,000	-2,206,000	-12,579,000	-11,661,000	-12,852,000	-7,669,000	-14,113,000	-11,783,000	-11,537,000	-49,629,000	-39,298,000	-45,102,000
Amortization of fair value adjustments	-3,540,000	5,025,000	2,369,000	2,093,000	4,207,000	8,538,000	2,240,000	7,587,000	16,782,000	8,865,000	6,969,000	10,077,000	5,947,000	22,572,000	42,693,000
Total net reduction in ultimate losses and loss adjustment expense liabilities	-125,056,000	-20,374,000	-27,403,000	9,161,000	-96,223,000	-62,547,000	-68,365,000	-10,818,000	-203,562,000	-51,262,000	-34,565,000	-4,072,000	-163,672,000	-237,953,000	-293,461,000
Life and annuity policy benefits	20,970,000	31,081,000	25,562,000	741,000	-2,992,000	822,000	896,000	974,000	-2,304,000	2,340,000	1,521,000	'	78,354,000	-300,000	1,557,000
Acquisition costs	5,050,000	6,149,000	9,613,000	2,387,000	'	'	'	'	'	'	'	'	23,199,000	'	'
Salaries and benefits	45,603,000	29,716,000	25,687,000	23,610,000	30,505,000	25,138,000	24,379,000	20,451,000	41,818,000	20,923,000	16,723,000	10,382,000	124,616,000	100,473,000	89,846,000
General and administrative expenses	19,538,000	29,126,000	20,002,000	17,946,000	13,169,000	14,409,000	14,156,000	14,858,000	5,090,000	20,759,000	28,211,000	17,750,000	86,612,000	56,592,000	71,810,000
Interest expense	3,593,000	3,270,000	3,091,000	2,435,000	2,540,000	1,713,000	2,062,000	2,111,000	2,431,000	2,435,000	1,697,000	1,966,000	12,389,000	8,426,000	8,529,000
Net foreign exchange (gains) losses	-375,000	-673,000	-8,403,000	5,082,000	-2,212,000	977,000	-627,000	2,268,000	-15,000	-8,878,000	1,932,000	7,334,000	-4,369,000	406,000	373,000
Total expenses	-22,677,000	78,295,000	48,149,000	61,362,000	-55,213,000	-19,488,000	-27,499,000	29,844,000	-156,542,000	-13,683,000	15,519,000	33,360,000	157,129,000	-72,356,000	-121,346,000
EARNINGS BEFORE INCOME TAXES	164,076,000	44,796,000	29,740,000	20,829,000	93,713,000	70,192,000	52,755,000	19,149,000	185,578,000	26,484,000	15,989,000	5,691,000	259,441,000	235,809,000	233,742,000
INCOME TAXES	-21,893,000	-1,340,000	-4,542,000	-7,844,000	-13,943,000	-14,700,000	-11,905,000	-3,742,000	-19,256,000	-4,436,000	-975,000	-617,000	-35,619,000	-44,290,000	-25,284,000
NET EARNINGS	142,183,000	43,456,000	25,198,000	12,985,000	79,770,000	55,492,000	40,850,000	15,407,000	166,322,000	22,048,000	15,014,000	5,074,000	223,822,000	191,519,000	208,458,000
Less: Net earnings attributable to noncontrolling interest	-4,722,000	-3,469,000	-6,001,000	-1,026,000	-9,864,000	-7,776,000	-129,000	-5,733,000	-37,571,000	-9,984,000	-5,639,000	-1,571,000	-15,218,000	-23,502,000	-54,765,000
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	137,461,000	39,987,000	19,197,000	11,959,000	69,906,000	47,716,000	40,721,000	9,674,000	128,751,000	12,064,000	9,375,000	3,503,000	208,604,000	168,017,000	153,693,000
EARNINGS PER SHARE - BASIC	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net earnings per ordinary share attributable to Enstar Group Limited shareholders	$8.32	$2.42	$1.16	$0.72	$4.25	$2.90	$2.48	$0.59	$8.89	$0.85	$0.67	$0.27	$12.62	$10.22	$11.03
EARNINGS PER SHARE - DILUTED	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net earnings per ordinary share attributable to Enstar Group Limited shareholders	$8.23	$2.39	$1.15	$0.72	$4.22	$2.86	$2.44	$0.58	$8.71	$0.83	$0.66	$0.26	$12.49	$10.10	$10.81
Weighted average ordinary shares outstanding - basic	'	'	'	'	'	'	'	'	'	'	'	'	16,523,369	16,441,461	13,930,221
Weighted average ordinary shares outstanding - diluted	'	'	'	'	'	'	'	'	'	'	'	'	16,703,442	16,638,021	14,212,440
Non-Life Run-Off [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
INCOME	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	12,341,000	28,134,000	41,216,000	30,920,000	'	'	'	'	'	'	'	'	112,611,000	'	'
Net reduction in ultimate losses and loss adjustment expense liabilities:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Losses incurred on current period premiums earned - non-life run-off	-14,153,000	24,236,000	35,523,000	28,533,000	'	'	'	'	'	'	'	'	74,139,000	'	'
Life and Annuity [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
INCOME	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	29,323,000	30,540,000	34,380,000	741,000	819,000	822,000	896,000	974,000	1,080,000	1,192,000	1,271,000	'	94,984,000	3,511,000	3,543,000
Active Underwriting [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
INCOME	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	32,212,000	'	'	'	'	'	'	'	'	'	'	'	32,212,000	'	'
Net reduction in ultimate losses and loss adjustment expense liabilities:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Losses incurred on current period premiums earned - non-life run-off	'	'	'	'	'	'	'	'	'	'	'	'	-19,303,000	'	'
Losses incurred - active underwriting	19,352,000	'	'	'	'	'	'	'	'	'	'	'	19,352,000	'	'
Reduction in estimates of net ultimate losses	'	'	'	'	'	'	'	'	'	'	'	'	19,352,000	'	'
Reduction in provisions for unallocated loss adjustment expense liabilities	'	'	'	'	'	'	'	'	'	'	'	'	-49,000	'	'
Total net reduction in ultimate losses and loss adjustment expense liabilities	'	'	'	'	'	'	'	'	'	'	'	'	$19,303,000	'	'

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
NET EARNINGS	$223,822	$191,519	$208,458
Other comprehensive income, net of tax:	'	'	'
Unrealized holding gains on investments arising during the year	68,115	69,721	5,393
Reclassification adjustment for net realized and unrealized gains included in net earnings	-70,651	-73,612	-9,214
Unrealized losses arising during the year, net of reclassification adjustment	-2,536	-3,891	-3,821
Decrease (increase) in defined benefit pension liability	4,930	-2,461	-3,718
Currency translation adjustment	-19,473	3,556	-903
Total other comprehensive loss	-17,079	-2,796	-8,442
Comprehensive income	206,743	188,723	200,016
Less comprehensive income attributable to noncontrolling interest	-8,600	-23,365	-54,244
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSTAR GROUP LIMITED	$198,143	$165,358	$145,772

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Share Capital - Ordinary Shares [Member]	Series A Non-Voting Convertible Ordinary Shares [Member]	Series B, C and D Non-Voting Convertible Ordinary Shares [Member]	Share Capital - Preference Shares [Member]	Treasury Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income Attributable to Enstar Group Limited [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
In Thousands	Total	Share Capital - Ordinary Shares [Member]	Series A Non-Voting Convertible Ordinary Shares [Member]		Share Capital - Preference Shares [Member]	Treasury Shares [Member]	Additional Paid-in Capital [Member]		Retained Earnings [Member]	Noncontrolling Interest [Member]
Balance, beginning of year at Dec. 31, 2010	'	$12,940	'	'	'	'	$667,907	$35,017	$651,143	$267,400
Return of capital	'	'	'	'	'	'	'	'	'	-16,200
Equity attributable to Enstar Group Limited on acquisition of Issue of shares and warrants, net	'	'	'	'	'	'	284,983	'	'	'
Preferred shares converted	'	'	'	750	-750	'	'	'	'	'
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	153,693	'	'	'	'	'	'	'	153,693	'
Dividends paid	'	'	'	'	'	'	'	'	'	-8,100
Issue of shares	'	674	'	1,976	750	'	'	'	'	'
Net earnings attributable to noncontrolling interest	-54,765	'	'	'	'	'	'	'	'	54,765	[1]
Foreign currency translation adjustments	-903	'	'	'	'	'	'	-972	'	69
Share awards granted/vested	'	51	'	'	'	'	776	'	'	'
Decrease (increase) in defined benefit pension liability	-3,718	'	'	'	'	'	'	-3,718	'	'
Amortization of equity incentive plan	'	'	'	'	'	'	2,663	'	'	'
Net movement in unrealized holding losses on investments	-3,821	'	'	'	'	'	'	-3,231	'	-589
Balance, beginning and end of year at Dec. 31, 2011	'	13,665	2,973	2,726	'	-421,559	956,329	27,096	804,836	297,345
Return of capital	'	'	'	'	'	'	'	'	'	-30,245
Equity attributable to Enstar Group Limited on acquisition of Issue of shares and warrants, net	'	'	'	'	'	'	-872	'	'	'
Preferred shares converted	'	'	'	'	'	'	'	'	'	'
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	168,017	'	'	'	'	'	'	'	168,017	'
Dividends paid	'	'	'	'	'	'	'	'	'	-68,987
Issue of shares	'	43	'	'	'	'	'	'	'	'
Net earnings attributable to noncontrolling interest	-23,502	'	'	'	'	'	'	'	'	23,502	[1]
Foreign currency translation adjustments	3,556	'	'	'	'	'	'	2,205	'	1,352
Share awards granted/vested	'	44	'	'	'	'	343	'	'	'
Decrease (increase) in defined benefit pension liability	-2,461	'	'	'	'	'	'	-2,461	'	'
Amortization of equity incentive plan	'	'	'	'	'	'	2,771	'	'	'
Net movement in unrealized holding losses on investments	-3,891	'	'	'	'	'	'	-2,401	'	-1,489
Balance, beginning and end of year at Dec. 31, 2012	1,775,233	13,752	2,973	2,726	'	-421,559	958,571	24,439	972,853	221,478
Return of capital	'	'	'	'	'	'	'	'	'	'
Equity attributable to Enstar Group Limited on acquisition of Issue of shares and warrants, net	'	'	'	'	'	'	650	'	'	'
Preferred shares converted	'	'	'	'	'	'	'	'	'	'
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	208,604	'	'	'	'	'	'	'	208,604	'
Dividends paid	'	'	'	'	'	'	'	'	'	-3,908
Issue of shares	'	6	'	'	'	'	'	'	'	'
Net earnings attributable to noncontrolling interest	-15,218	'	'	'	'	'	'	'	'	11,048	[1]
Foreign currency translation adjustments	-19,473	'	'	'	'	'	'	-13,557	'	-5,916
Share awards granted/vested	'	45	'	'	'	'	'	'	'	'
Decrease (increase) in defined benefit pension liability	4,930	'	'	'	'	'	'	4,930	'	'
Amortization of equity incentive plan	'	'	'	'	'	'	2,924	'	'	'
Net movement in unrealized holding losses on investments	-2,536	'	'	'	'	'	'	-1,834	'	-702
Balance, beginning and end of year at Dec. 31, 2013	$1,977,523	$13,803	$2,973	$2,726	'	($421,559)	$962,145	$13,978	$1,181,457	$222,000

[1]	Excludes earnings attributable to redeemable noncontrolling interest.

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES:	'	'	'
NET EARNINGS	$223,822	$191,519	$208,458
Adjustments to reconcile net earnings to cash flows provided by operating activities:	'	'	'
Gain on bargain purchase	'	'	-13,105
Net realized and unrealized investment gains	-188	-42,233	-8,020
Net realized and unrealized gains from other investments	-70,463	-31,379	-1,194
Other items	11,276	-765	1,518
Depreciation and amortization	1,055	1,469	1,593
Net amortization of premiums and discounts	51,505	28,758	25,085
Net movement of trading securities held on behalf of policyholders	3,485	24,225	-6,816
Sales and maturities of trading securities	2,679,826	2,468,584	1,463,637
Purchases of trading securities	-2,713,581	-2,618,029	-2,158,509
Changes in assets and liabilities:	'	'	'
Reinsurance balances recoverable	430,542	666,793	238,818
Funds held by reinsured companies	175,750	-257,504	166,951
Other assets	155,177	63,952	-28,506
Losses and loss adjustment expenses	-706,880	-623,174	-675,108
Policy benefits for life and annuity contracts	6,443	'	'
Insurance and reinsurance balances payable	-165,896	-65,475	-24,833
Unearned premiums	-81,967	'	'
Accounts payable and accrued liabilities	-22,295	-3,209	-18,301
Other liabilities	-31,998	9,118	-81,588
Net cash flows used in operating activities	-62,387	-187,350	-909,920
INVESTING ACTIVITIES:	'	'	'
Acquisitions, net of cash acquired	-409,560	'	-88,505
Sales and maturities of available-for-sale securities	196,507	353,913	445,052
Purchase of held-to-maturity securities	-112	'	'
Purchase of available-for-sale securities	-15,739	'	'
Maturities of held-to-maturity securities	18,449	'	'
Movement in restricted cash and cash equivalents	-78,638	73,226	290,207
Purchase of other investments	-107,396	-214,558	-24,787
Redemption of other investments	28,568	16,839	66,925
Other investing activities	2,132	-789	3,031
Net cash flows (used in) provided by investing activities	-365,789	228,631	691,923
FINANCING ACTIVITIES:	'	'	'
Net proceeds from issuance of shares	'	'	287,377
Distribution of capital to noncontrolling interest	'	-30,245	-16,200
Contribution by redeemable noncontrolling interest	96,689	'	'
Dividends paid to noncontrolling interest	-3,908	-68,987	-8,100
Receipt of loans	369,800	'	274,150
Repayment of loans	-39,505	-134,541	-277,458
Net cash flows provided by (used in) financing activities	423,076	-233,773	259,769
EFFECT OF EXCHANGE RATE CHANGES ON FOREIGN CURRENCY CASH AND CASH EQUIVALENTS	-5,949	-3,092	9,548
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-11,049	-195,584	51,320
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	654,890	850,474	799,154
CASH AND CASH EQUIVALENTS, END OF YEAR	643,841	654,890	850,474
Supplemental Cash Flow Information	'	'	'
Net income taxes paid	32,115	27,938	64,679
Interest paid	$9,114	$9,155	$6,948

Description_of_Business

Description of Business	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Description of Business	'
	1	DESCRIPTION OF BUSINESS
	Enstar Group Limited (“Enstar” or the “Company”) was formed in August 2001 under the laws of Bermuda. The Company’s core focus is to acquire and manage insurance and reinsurance companies in run-off and portfolios of insurance and reinsurance business in run-off, and to provide management, consulting and other services to the insurance and reinsurance industry.
	With the Company’s 2013 acquisitions of the closed U.S. life and annuity operations of HSBC Holdings plc (“Pavonia”), Arden Reinsurance Company Ltd. (“Arden”) and Atrium Underwriters Ltd. (“Atrium”), it now measures the results of its operations in three segments: (i) non-life run-off; (ii) life and annuities; and (iii) active underwriting. The Company’s non-life run-off segment comprises the operations and financial results of those subsidiaries acquired for the purpose of running off their property and casualty business, this segment also includes the discontinued business of Arden. The Company’s life and annuities is comprised primarily of Pavonia, which operates a closed block of life and annuity business. The Company’s active underwriting segment is comprised of Atrium and Arden’s reinsurance of Atrium. Atrium is an underwriting business at Lloyd’s of London, which manages Syndicate 609 and provides one quarter of the syndicate’s capital. The syndicate provides insurance and reinsurance on a worldwide basis.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	2	SIGNIFICANT ACCOUNTING POLICIES
	Basis of Preparation
	The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).
	Certain reclassifications have been made to the prior year reported amounts to conform to the current year presentation. These reclassifications had no impact on net earnings previously reported.
	Basis of Consolidation
	The consolidated financial statements include the assets, liabilities and results of operations of the Company as of December 31, 2013 and 2012 and for the years ended December 31, 2013, 2012 and 2011. Results of operations for subsidiaries acquired are included from the dates of their acquisition by the Company. Intercompany transactions are eliminated on consolidation.
	Use of Estimates
	The preparation of these consolidated financial statements requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. While management believes that the amounts included in the consolidated financial statements reflect its best estimates and assumptions, actual results could differ from those estimates. The Company’s principal estimates include, but are not limited to:

		•	reserves for losses and loss adjustment expenses;

		•	policy benefits for life and annuity contracts;

		•	reinsurance balances recoverable, including the provisions for uncollectible amounts;

		•	other-than-temporary impairments in the carrying value of available-for-sale investment securities;

		•	valuation of certain other investments that are measured using significant unobservable inputs;

		•	valuation of goodwill and intangible assets; and

		•	fair value estimates associated with accounting for acquisitions.
	Significant Accounting Policies
	The Company’s significant accounting policies are described below:
	(a) Cash and cash equivalents
	The Company considers all highly liquid debt instruments purchased with an original maturity of 3 months or less to be cash and cash equivalents.
	(b) Investments
	Short-term investments and fixed maturity investments
	Short-term investments comprise investments with a maturity greater than three months but less than one year from the date of purchase. Fixed maturities comprise investments with a maturity of one year and greater from the date of purchase.
	Short-term investments and fixed maturities classified as trading are carried at fair value, with realized and unrealized holding gains and losses included in net earnings and reported as net realized and unrealized gains and losses.
	Short-term investments and fixed maturity investments classified as held-to-maturity securities, which are securities that the Company has the positive intent and ability to hold to maturity, are carried at amortized cost. The cost of short-term investments and fixed maturities are adjusted for amortization of premiums and accretion of discounts.
	Short-term and fixed maturity investments classified as available-for-sale are carried at fair value, with unrealized gains and losses excluded from net earnings and reported as a separate component of accumulated other comprehensive income. Realized gains and losses on sales of investments classified as available-for-sale are recognized in the consolidated statements of earnings.
	The costs of short-term and fixed maturity investments are adjusted for amortization of premium or discount, recognized using the effective yield method and included in net investment income. For mortgage-backed and asset-backed investments, and any other holdings for which there is a prepayment risk, prepayment assumptions are evaluated and revised on a regular basis.
	Investment purchases and sales are recorded on a trade-date basis. Realized gains and losses on the sale of investments are based upon specific identification of the cost of investments.
	Fixed maturity investments classified as available-for-sale and held-to-maturity are reviewed quarterly to determine if they have sustained an impairment of value that is, based on management’s judgement, considered to be other than temporary. The process includes reviewing each fixed maturity investment that is below cost and: (1) determining if the Company has the intent to sell the fixed maturity investment; (2) determining if it is more likely than not that the Company will be required to sell the fixed maturity investment before its anticipated
	recovery; and (3) assessing whether a credit loss exists, that is, whether the Company expects that the present value of the cash flows expected to be collected from the fixed maturity investment is less than the amortized cost basis of the investment. In evaluating credit losses, the Company considers a variety of factors in the assessment of a fixed maturity investment including: (1) the time period during which there has been a significant decline below cost; (2) the extent of the decline below cost and par; (3) the potential for the investment to recover in value; (4) an analysis of the financial condition of the issuer; (5) the rating of the issuer; and (6) failure of the issuer of the investment to make scheduled interest or principal payments. If management concludes an investment is other-than-temporarily impaired (“OTTI”), then the difference between the fair value and the amortized cost of the investment is presented as an OTTI charge in the consolidated statements of earnings, with an offset for any noncredit-related loss component of the OTTI charge to be recognized in other comprehensive income. Accordingly, only the credit loss component of the OTTI amount would have an impact on the Company’s earnings.
	Equities
	Equities are classified as trading and are carried at fair value with realized and unrealized holding gains and losses included in net earnings and reported as net realized and unrealized gains and losses.
	Other investments
	Other investments include investments in limited partnerships and limited liability companies (collectively “private equities”) and fixed income, hedge, equity and real estate debt funds (collectively “funds”) that carry their investments at fair value. These funds are stated at fair value, which ordinarily will be the most recently reported net asset value as advised by the fund manager or administrator. Many of the Company’s fund investments publish net asset values on a daily basis and provide daily liquidity; others report on a monthly basis. Private equities typically report quarterly. The Company believes the reported net asset value represents the fair value market participants would apply to an interest in the various private equities or funds. The change in fair value is included in net realized and unrealized gains on investments and recognized in net earnings.
	(c) Derivative instruments
	The Company recognizes all derivatives as either assets or liabilities in the consolidated balance sheets and carries them at the fair value of the instrument. The Company uses derivative instruments for purposes of its overall foreign currency risk management strategy. Changes in fair value and realized gains or losses on derivative instruments are recorded in net foreign exchange gains and losses.
	(d) Losses and loss adjustment expenses
	Non-life run-off
	The liability for losses and loss adjustment expenses includes an amount determined from reported claims and an amount, based on historical loss experience and industry statistics, for losses incurred but not reported determined using a variety of actuarial methods. These estimates are continually reviewed and are necessarily subject to the impact of future changes in factors such as claim severity and frequency, changes in economic conditions including the impact of inflation, legal developments and changes in social attitudes. While management believes that the amount is adequate, the ultimate liability may be significantly in excess of, or less than, the amounts provided. Adjustments will be reflected as part of net increase or reduction in losses and loss adjustment expense liabilities in the periods in which they become known. Premium and commission adjustments may be triggered by incurred losses and any amounts are recorded in the same period that the related incurred loss is recognized.

	Commutations provide an opportunity for the Company to exit exposures to entire policies with insureds and reinsureds for an agreed upon payment, or payments, often at a discount to the previously estimated ultimate liability. As a result of exiting all exposures to such policies, all advised case reserves and incurred but not reported (“IBNR”) reserves relating to the insured or reinsured are eliminated. A commutation is recognized upon the execution of a commutation release agreement. Following completion of a commutation, all the related balances, including insurance and reinsurance balances payable and/or receivable, funds held by ceding companies, and losses and loss adjustment expenses (including fair value adjustments and estimated IBNR), are written off with corresponding gain or loss recorded in the net reduction of ultimate losses. A commutation may result in a net gain irrespective of whether the settlement exceeds the advised case reserves. Advised case reserves are those reserve estimates for a specific loss or losses reported to the Company by either the broker or insured or reinsured. IBNR reserves are established by the Company at a class of business or exposure level for claims that have not yet been reported to the Company but can reasonably be expected to have occurred, as well as for the future development of reported claims. A commutation settlement is a negotiated settlement of both the advised case reserves and an estimate of the IBNR reserves that relate to the policies being commuted. For latent exposures with a long reporting tail, the estimated level of IBNR reserves may be significantly higher than the advised case reserves. In such an instance, the commutation settlement of a block of such policies may be greater than the advised case reserves but less than the aggregate of the advised case reserves plus the estimated related IBNR reserves, resulting in a total saving to the remaining liability.
	To the extent possible, all prior historical loss development that relates to commuted exposures is eliminated to produce revised historical loss development for the remaining non-commuted exposures. The Company’s estimates of IBNR reserves are not determined at the policyholder level but at the aggregate class of business or exposure level. Therefore, the Company does not typically identify a specific amount of IBNR reserves settled with each commutation. Rather, on an annual basis in the fourth quarter, the Company’s actuaries apply their actuarial methodologies to the remaining aggregate exposures and revised historical loss development information to reassess their estimates of gross and net ultimate liabilities and required gross and net IBNR reserves. Should a commutation that the Company considers significant occur in one of the first three quarters, then the Company, in conjunction with its independent actuaries, would estimate the amount of IBNR that would be associated with the policies being commuted. If the financial impact (including release of IBNR) of the commutation is considered significant, the Company would adjust its estimate of ultimate loss and loss adjustment expense liabilities in the quarter that the commutation was concluded. The agreed commutation settlement is recorded in net losses paid.
	To the extent that commuted policies are protected by reinsurance, then the Company will, on completion of a commutation with an insured or reinsured, negotiate with the reinsurers to contribute their share of the commutation settlement. Any amounts received from such reinsurers will be recorded in net losses paid and the impact of any savings or loss on reinsurance recoverable on unpaid losses will be included in the actuarial reassessment of net ultimate liabilities and net IBNR reserves.
	Commutations of acquired companies’ exposures have the effect of accelerating the payout of claims compared to the probability-weighted ranges of actuarially projected cash flows that the Company applies when estimating the fair values of assets and liabilities at the time of acquisition. Any material acceleration of payout together with the impact of any material loss reserve savings in any period will also accelerate the amortization of fair value adjustments in that period.
	The Company’s insurance and reinsurance subsidiaries also establish provisions for loss adjustment expenses relating to run-off costs for the estimated duration of the run-off, which are included in losses and loss adjustment expenses. These provisions are assessed at each reporting date, and provisions relating to future periods are adjusted to reflect any changes in estimates of the periodic run-off costs or the duration of the run-off, including the impact of any acceleration of the run-off period that may be caused by commutations. Provisions relating to the current period together with any adjustment to future run-off provisions are included in net reduction in ultimate loss and loss adjustment expenses in the consolidated statements of earnings.
	Active underwriting
	The reserve for losses and loss expenses includes reserves for unpaid reported losses and for IBNR reserves. The reserves for unpaid reported losses and loss expenses are established by management based on reports from brokers, ceding companies and insureds and represents the estimated ultimate cost of events or conditions that have been reported to, or specifically identified by the Company. The reserve for incurred but not reported losses and loss expenses is established by management based on actuarially determined estimates of ultimate losses and loss expenses. Inherent in the estimate of ultimate losses and loss expenses are expected trends in claim severity and frequency and other factors which may vary significantly as claims are settled. Accordingly, ultimate losses and loss expenses may differ materially from the amounts recorded in the consolidated financial statements. These estimates are reviewed regularly and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments, if any, will be recorded in earnings in the period in which they become known. Prior period development arises from changes to loss estimates recognized in the current year that relate to loss reserves established in previous calendar years.
	(e) Reinsurance balances recoverable
	Amounts billed to, and due from, reinsurers result from paid movements in the underlying assumed business and are calculated in accordance with the terms of the individual reinsurance contracts.
	Similarly, reinsurance balances recoverable related to the Company’s assumed case reserves are calculated by applying the terms of any applicable reinsurance coverage to movements in the underlying assumed case reserves. The Company’s estimate of reinsurance balances recoverable related to its assumed IBNR reserves is recognized on a basis consistent with the underlying assumed IBNR reserves.
	The Company’s reinsurance balances recoverable are presented net of a provision for uncollectible amounts, reflecting the amount deemed not collectible due to credit quality, collection problems due to location of the reinsurer, contractual disputes with reinsurers over individual contentious claims, contract language or coverage or for some other reason.
	(f) Retroactive reinsurance and novations
	Consideration received for business assumed by way of novation and premiums received on retroactive reinsurance is recorded in the balance sheet. The difference between the consideration received and liabilities assumed is recorded as an intangible asset or liability. Intangible assets or liabilities are subsequently amortized using the interest method over the expected claims settlement periods. As changes in estimates of timing or amount of losses and loss adjustment expenses are recognized, the amortization is adjusted retrospectively and included in losses and loss adjustment expenses in the period of the charge.
	(g) Premium revenue recognition
	Premiums written are earned on a pro-rata basis over the period the coverage is provided. Reinsurance premiums are recorded at the inception of the policy, are based upon contractual terms and for certain business is estimated based on underlying contracts or from information provided by clients and/or brokers. Changes in reinsurance premium estimates are expected and may result in significant adjustments in future periods. These estimates change over time as additional information regarding changes in underlying exposures is obtained. Any subsequent differences arising on such estimates are recorded as premiums written in the period they are determined.
	Insurance premiums are recorded at the inception of the policy and are earned on a pro-rata basis over the period of coverage.
	Unearned premiums represent the portion of premiums written that relate to the unexpired terms of policies in force. Premiums ceded are similarly pro-rated over the period the coverage is provided with the unearned portion being deferred as prepaid reinsurance premiums.
Certain contracts that the Company wrote, prior to going into run-off, are retrospectively rated and additional premium will be due should losses exceed pre-determined, contractual thresholds. These required additional premiums are based upon contractual terms and management judgment is involved with respect to the estimate of the amount of losses that the Company expects to be ceded. Additional premiums are recognized at the time loss thresholds specified in the contract are exceeded and are earned over the coverage period, or are earned immediately if the period of risk coverage has passed. Changes in estimates of losses recorded on contracts with additional premium features will result in changes in additional premiums based on contractual terms.
Life and annuities
The Pavonia companies, prior to going into run-off, wrote various U.S. and Canadian life insurance, including credit life and disability insurance, term life insurance, assumed life reinsurance and annuities. The Pavonia companies will continue to recognize premiums on term life insurance, assumed life reinsurance and credit life and disability insurance.
Premiums from term life insurance, credit life and disability insurance and assumed life reinsurance are generally recognized as revenue when due from policyholders. Term life, assumed life reinsurance and credit life and disability policies include those contracts with fixed and guaranteed premiums and benefits. Benefits and expenses are matched with such revenue to result in the recognition of profit over the life of the contracts.
(h) Premiums Receivable
Premiums receivable represent amounts currently due and amounts not yet due on insurance and reinsurance policies. Premiums for insurance policies are generally due at inception. Premiums for reinsurance policies generally become due over the period of coverage based on the policy terms. The Company monitors the credit risk associated with premiums receivable, taking into consideration that credit risk is reduced by the Company’s contractual right to offset loss obligations or unearned premiums against premiums receivable. Amounts deemed uncollectible are charged to net earnings in the period they are determined. Changes in the estimate of premiums written will result in an adjustment to premiums receivable in the period they are determined. Certain contracts are retrospectively rated and provide for a final adjustment to the premium based on the final settlement of all losses. Premiums receivable on such contracts are adjusted based on the estimate of losses the Company expects to incur, and are not considered due until all losses are settled.
(i) Policy Benefits for Life and Annuity Contracts
The Company’s policy benefits for life and annuity contracts (“policy benefits”) are calculated using standard actuarial techniques and cash flow models in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 944, Financial Services — Insurance. The Company establishes and maintains its policy benefits at a level that the Company estimates will, when taken together with future premium payments and investment income expected to be earned on associated premiums, be sufficient to support all future cash flow benefit obligations and third party servicing obligations as they become payable. The Company reviews its policy benefits regularly and performs loss recognition testing based upon cash flow projections.
Since the development of the policy benefits is based upon cash flow projection models, the Company makes estimates and assumptions based on experience and industry mortality tables, longevity and morbidity rates, lapse rates, expenses and investment experience, including a provision for adverse deviation. The assumptions used to determine policy benefits are determined at the inception of the contracts, reviewed and adjusted at the point of acquisition, as required, and are locked-in throughout the life of the contract unless a premium deficiency develops. The assumptions are reviewed no less than annually and are unlocked if they would result in a material adverse reserve change. The Company establishes these estimates based upon transaction-specific historical experience, information provided by the ceding company for the assumed business and industry experience. Actual results could differ materially from these estimates. As the experience on the contracts emerges, the assumptions are reviewed by management. The Company determines whether actual and anticipated experience indicates that existing policy benefits, together with the present value of future gross premiums, are sufficient to cover the present value of future benefits, settlement and maintenance costs and to recover unamortized acquisition costs. If such a review indicates that policy benefits should be greater than those currently held, then the locked-in assumptions are revised and a charge for policy benefits is recognized at that time.
Because of the many assumptions and estimates used in establishing policy benefits and the long-term nature of the contracts, the reserving process, while based on actuarial techniques, is inherently uncertain.
(j) Redeemable noncontrolling interest
In connection with the acquisitions of Arden and Atrium, and with the proposed acquisition of Torus Insurance Holdings Limited (“Torus”), (as described in Note 3, —Acquisitions) certain subsidiaries have issued or will issue shares to a noncontrolling interest. These shares provide certain redemption rights to the holder, which may be settled in the Company’s own shares or cash, at the Company’s option. The Company classifies redeemable noncontrolling interest with redemption features that are not solely within the control of the Company within temporary equity in its consolidated balance sheets and carries them at the redemption value, which is fair value. The Company recognizes changes in the fair value that exceed the carrying value of redeemable noncontrolling interest through retained earnings as if the balance sheet date were also the redemption date. For a description of the redemption rights refer to Note 3 — Acquisitions.
(k) Fees and commission income
Fixed fee income is recognized in accordance with the term of the Company’s third-party management agreements. Time-based fees are recognized as services are provided. Success-based fees are recognized when all of the contractual requirements specified in the agreement are met. Profit commissions are recorded on an accruals basis, and are earned in line with the annual accounting results of the syndicate managed by Atrium.
(l) Foreign exchange
The reporting currency of the Company is the U.S. dollar. Assets and liabilities of entities whose functional currency is not the U.S. dollar are translated at period end exchange rates. Revenue and expenses of such foreign entities are translated at average exchange rates during the year. The effect of the currency translation adjustments for these foreign entities is included in accumulated other comprehensive income.
Other foreign currency assets and liabilities that are considered monetary items are translated at exchange rates in effect at the balance sheet date. Foreign currency revenues and expenses are translated at transaction date exchange rates. These exchange gains and losses are included in the determination of net earnings.
(m) Earnings per share
Basic earnings per share is based on the weighted average number of ordinary shares outstanding and excludes any dilutive effects of warrants, options and convertible securities. Diluted earnings per share is based on the weighted average number of ordinary and ordinary share equivalents outstanding calculated using the treasury stock method for all potentially dilutive securities. When the effect of dilutive securities would be anti-dilutive, these securities are excluded from the calculation of diluted earnings per share.
(n) Acquisitions
The Company uses the purchase method in accounting for acquisitions. The difference between the fair value of net assets acquired and purchase price is recorded as goodwill or negative goodwill.
The purchase method of accounting requires that the acquirer record the assets and liabilities acquired at their estimated fair value. The fair values of each of the reinsurance assets and liabilities acquired are derived from probability-weighted ranges of the associated projected cash flows, based on actuarially prepared information and management’s strategy. The Company’s run-off strategy, as well as that of other run-off market participants, is expected to be different from the sellers as generally sellers are not specialized in running off insurance and reinsurance liabilities whereas the Company and other market participants do specialize in such run-offs.
The key assumptions used by the Company and, it believes, by other run-off market participants in the fair valuation of acquired companies are (i) the projected payout, timing and amount of claims liabilities; (ii) the related projected timing and amount of reinsurance collections; (iii) a risk-free discount rate, which is applied to determine the present value of the future cash flows; (iv) the estimated unallocated loss adjustment expenses to be incurred over the life of the run-off; (v) the impact of any accelerated run-off strategy; and (vi) an appropriate risk margin.
The difference between the original carrying value of reinsurance liabilities and reinsurance assets acquired at the date of acquisition and their fair value is recorded as an intangible asset or other liability, which the Company refers to as the fair value adjustment (“FVA”). The FVA is amortized over the estimated payout period of outstanding losses and loss expenses acquired. To the extent the actual payout experience after the acquisition is materially faster or slower than anticipated at the time of the acquisition, there is an adjustment to the estimated ultimate loss reserves, or there are changes in bad debt provisions or in estimates of future run-off costs following accelerated payouts, then the amortization of the FVA is adjusted to reflect such changes.
(o) Goodwill
Goodwill represents the excess of the purchase price over the fair value of the net assets acquired. The Company performs an initial valuation of its goodwill assets and assesses goodwill for impairment on an annual basis. If, as a result of the assessment, the Company determines the value of its goodwill asset is impaired, goodwill is written down in the period in which the determination is made. No impairment has been recorded as a result of the assessment.

(p) Intangible Assets
Intangible assets represent the fair value adjustments related to unpaid losses and loss expenses, reinsurance balances recoverable and policy benefits for life and annuity contracts along with the fair values of Lloyd’s syndicate capacity, customer relationships, management contract and brand arising from the acquisition of Atrium. Definite-lived intangible assets are amortized over their useful lives. The Company recognizes the amortization of all intangible assets in the consolidated statement of earnings. Indefinite-lived intangible assets are not subject to amortization. The carrying values of intangible assets are reviewed for indicators of impairment on at least an annual basis. Impairment is recognized if the carrying values of the intangible assets are not recoverable from their undiscounted cash flows and are measured as the difference between the carrying value and the fair value.
(q) Share-based compensation
Share-based payment awards settled in ordinary shares are recorded in additional paid-in capital. The fair value of the award is measured at the grant date and expensed over the vesting period.
(r) Income taxes
Certain subsidiaries and branches of the Company operate in jurisdictions where they are subject to taxation. Current and deferred income taxes are charged or credited to net income, or, in certain cases, to accumulated other comprehensive income, based upon enacted tax laws and rates applicable in the relevant jurisdiction in the period in which the tax becomes accruable or realizable. Deferred income taxes are provided for all temporary differences between the bases of assets and liabilities used in the financial statements and those used in the various jurisdictional tax returns. When management’s assessment indicates that it is more likely than not that deferred income tax assets will not be realized, a valuation allowance is recorded against the deferred tax assets.
The Company recognizes a tax benefit relating to uncertain tax positions only where the position is more likely than not to be sustained assuming examination by tax authorities. A liability is recognized for any tax benefit (along with any interest and penalty, if applicable) claimed in a tax return in excess of the amount allowed to be recognized in the financial statements under U.S. GAAP. Any changes in amounts recognized are recorded in the period in which they are determined.
New Accounting Standards Adopted in 2013
ASU 2011-11, Disclosures About Offsetting Assets and Liabilities
In December 2011, the FASB issued new disclosure requirements regarding the nature of an entity’s rights of setoff and related arrangements associated with its financial instruments and derivative instruments. The new disclosures are designed to make financial statements that are prepared under U.S. GAAP more comparable to those prepared under International Financial Reporting Standards. The Company adopted the amended guidance effective January 1, 2013. The adoption of the guidance did not have a material impact on the consolidated financial statements.
ASU 2013-02, Presentation of Items Reclassified from Accumulated Other Comprehensive Income
In February 2013, the FASB issued new disclosure requirements for items reclassified from accumulated other comprehensive income. This guidance requires entities to disclose in a single location (either on the face of the financial statement that reports net earnings or in the notes) the effects of reclassification out of accumulated other comprehensive income. The Company adopted this guidance effective January 1, 2013. The adoption of the guidance did not have a material impact on the consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted
ASU 2013-11 Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The objective of ASU 2013-11 is to improve the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 seeks to reduce the diversity in practice by providing guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 is effective for annual and interim reporting periods beginning after December 15, 2013, with both early adoption and retrospective application permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position.

Acquisitions

Acquisitions	12 Months Ended
Acquisitions	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	3	ACQUISITIONS
	2014
	Torus Insurance Holdings Limited
	Amalgamation Agreement
	On July 8, 2013, the Company, Veranda Holdings Ltd (“Veranda”), an entity in which the Company owns an indirect 60% interest through its 60% interest in Bayshore Holdings Limited (“Bayshore”), Hudson Securityholders Representative LLC and Torus Insurance Holdings Limited (“Torus”) entered into an Agreement and Plan of Amalgamation (the “Amalgamation Agreement”). The Amalgamation Agreement provides for the amalgamation (the “Amalgamation”) of Veranda and Torus (the combined entity, the “Amalgamated Company”). Torus is a global specialty insurer and holding company of six wholly-owned insurance vehicles, including two Lloyd’s syndicates, one of which is in run-off.
	The purchase price for the Amalgamation is approximately $692.0 million and will be paid half in cash and half in the Company’s stock. The Company and Kenmare Holdings Ltd. (its wholly-owned subsidiary) (“Kenmare”) will contribute to Bayshore, the parent company of Veranda, approximately $69.2 million in cash and 2,612,346 shares of the Company (which will consist of a combination of voting ordinary shares, par value $1.00 per share (the “Voting Ordinary Shares”) and newly-created Series B convertible non-voting preference shares, par value $1.00 per share (the “Non-Voting Preferred Shares”)) in exchange for a 60% interest in Bayshore. Trident V, L.P., Trident V Parallel Fund, L.P. and Trident V Professionals Fund, L.P. (collectively, “Trident”) will contribute to Bayshore approximately $276.8 million in cash in exchange for a 40% interest in Bayshore. Bayshore will use the contributed funds and shares to pay the purchase price for the Amalgamation.
	The number of shares to be issued by the Company is fixed and was determined by reference to an agreed-upon value per share under the Amalgamation Agreement of $132.448, which was the average closing price of the Voting Ordinary Shares over the 20 trading days prior to the date of signing of the Amalgamation Agreement. The final purchase price for the Amalgamation cannot be determined until closing because the overall value of the stock component will be an amount equal to the price of the Company’s Voting Ordinary Shares on the closing date multiplied by the fixed number of shares that will be issued. Following the Amalgamation, the Company and Trident will continue to own, respectively, a 60% and 40% indirect interest in the Amalgamated Company through their ownership of Bayshore.

	Completion of the Amalgamation is conditioned on, among other things, governmental and regulatory approvals and satisfaction of various customary closing conditions. The transaction is expected to close in the first quarter of 2014.
	Stock Issuance
	FR XI Offshore AIV, L.P., First Reserve Fund XII, L.P., FR XII A Parallel Vehicle L.P. and FR Torus Co-Investment, L.P. (collectively, “First Reserve”) will receive Voting Ordinary Shares, Non-Voting Preferred Shares and cash consideration in the transaction. In the event that the number of Voting Ordinary Shares deliverable to First Reserve at the closing of the Amalgamation would cause First Reserve, as of immediately after such closing, to beneficially own Voting Ordinary Shares that constitute more than 9.5% of the voting power of all shares of the Company, then the Company will issue to First Reserve, at the closing, the total number of shares of Voting Ordinary Shares representing 9.5% of the voting power of all shares of the Company as of immediately after the closing and Non-Voting Preferred Shares representing the remainder of the shares that First Reserve is entitled to under the Amalgamation Agreement. Corsair Specialty Investors, L.P. (“Corsair”) will receive both Voting Ordinary Shares and cash consideration in the transaction. The remaining Torus shareholders will receive all cash. As a result of the Amalgamation, First Reserve will receive approximately 9.5% and 11.5%, respectively, of the Company’s Voting Ordinary Shares and outstanding share capital and Corsair will receive approximately 2.5% and 2.1%, respectively, of the Company’s Voting Ordinary Shares and outstanding share capital.
	The Company and First Reserve will enter into a Shareholder Rights Agreement at the closing of the Amalgamation, under which the Company has agreed that First Reserve will have the right to designate one representative to the Company’s Board of Directors. This designation right terminates if First Reserve ceases to beneficially own at least 75% of the total number of Voting Ordinary Shares and Non-Voting Preferred Shares acquired by it under the Amalgamation Agreement.
	The Company will also enter into a Registration Rights Agreement with First Reserve and Corsair at the closing of the Amalgamation that provides First Reserve and Corsair with certain rights to cause the Company to register under the Securities Act of 1933, as amended (the “Act”), the Voting Ordinary Shares (including the Voting Ordinary Shares into which the Non-Voting Preferred Shares may convert) issued pursuant to the Amalgamation and any securities issued by the Company in connection with the foregoing by way of a share dividend or share split or in connection with any recapitalization, reclassification or similar reorganization (the foregoing, collectively, “Registrable Securities”). Pursuant to the Registration Rights Agreement, the Company must file a resale shelf registration statement for the Registrable Securities within 20 business days after the closing of the Amalgamation. In addition, at any time following the six-month anniversary of the closing of the Amalgamation, First Reserve will be entitled to make three written requests for the Company to register all or any part of the Registrable Securities under the Act, subject to certain exceptions and conditions set forth in the Registration Rights Agreement. Corsair will have the right to make one such request. First Reserve and Corsair will also be granted “piggyback” registration rights with respect to the Company’s registration of Voting Ordinary Shares for its own account or for the account of one or more of its securityholders.
	Trident Co-investment in Torus
	In connection with the Amalgamation Agreement, the Company, Kenmare and Trident entered into an Investors Agreement on July 8, 2013 governing their investments in Bayshore, and Kenmare and Trident entered into individual equity commitment letters obligating each to fund its respective portion of the purchase price for the Amalgamation noted above. Completion of Kenmare’s and Trident’s funding obligations is conditioned on, among other things, the satisfaction of certain conditions tied directly to the satisfaction of the closing conditions under the Amalgamation Agreement.
	Upon the funding of the equity commitments at the closing of the Amalgamation, Kenmare and Trident have agreed to enter into a Shareholders’ Agreement (the “Bayshore Shareholders’ Agreement”). Among other things, the Bayshore Shareholders’ Agreement will provide that Kenmare would appoint three members to the Bayshore board of directors and Trident would appoint two members.
	The Bayshore Shareholders’ Agreement includes a five-year period during which neither party can transfer its ownership interest in Bayshore to a third party (the “Restricted Period”). Following the Restricted Period: (i) each party must offer the other party the right to buy its shares before the shares are offered to a third party; (ii) Kenmare can require Trident to participate in a sale of Bayshore to a third party as long as Kenmare owns 55% of Bayshore; (iii) each party has the right to be included on a pro rata basis in any sales made by the other party; and (iv) each party has the right to buy its pro rata share of any new securities issued by Bayshore.
	During the 90-day period following the fifth anniversary of the closing of the Amalgamation, and at any time following the seventh anniversary of such closing, Kenmare would have the right to redeem Trident’s shares in Bayshore at their then fair market value, which would be payable in cash. Following the seventh anniversary of the closing, Trident would have the right to require Kenmare to purchase Trident’s shares for their then current fair market value, which Kenmare would have the option to pay either in cash or by delivering the Company’s ordinary voting shares.
	Trident is a holder of approximately 9.7% of the Company’s ordinary shares. James D. Carey, a member and senior principal of Stone Point Capital LLC (the Manager of Trident), is a Member of the Company’s Board of Directors. Refer to Note 19 for information regarding the Company’s other transactions with Trident and its affiliates.
	2013
	Atrium
	On November 25, 2013, Kenmare, the Company’s wholly-owned subsidiary, together with Trident, completed the acquisition of Atrium. The purchaser of Atrium, Northshore Holdings Limited (“Northshore”), is 60% owned by Kenmare and 40% owned by Trident. Atrium is an underwriting business at Lloyd’s of London that manages Syndicate 609 (“S609”) and provides approximately one quarter of the syndicate’s capital. Atrium specializes in accident and health, aviation, marine property, non-marine property, professional liability, property and casualty binding authorities, reinsurance, upstream energy, war and terrorism insurance, cargo and fine art.
	The purchase price for Atrium was $158.0 million. Kenmare’s portion of the purchase price was $94.8 million, and was financed by borrowings under the Company’s revolving credit facility.
	The purchase price and net assets acquired at fair value are as follows:


	Purchase price		$	158,000

	Net assets acquired at fair value		$	119,152

	Excess of purchase price over fair value of net assets acquired		$	38,848

	The purchase price was allocated to the acquired assets and liabilities of Atrium based on estimated fair values at the acquisition date. The Company recognized goodwill of $38.8 million, all of which was recorded within the active underwriting segment and is attributable primarily to Atrium’s assembled workforce. The Company also recognized indefinite lived intangible assets of $63.0 million and other definite lived intangible assets of $27.0 million.
	The Company has not completed the process of determining the fair value of the intangible assets acquired and deferred taxes. These valuations will be completed within the measurement period, which cannot exceed 12 months from the acquisition date. As a result, the fair value recorded for these items is a provisional estimate and may be subject to adjustment. Once completed, any adjustments resulting from the valuations may impact the individual amounts recorded for assets acquired and liabilities assumed, as well as the residual goodwill.
	The following table summarizes the provisional fair values of the assets acquired and liabilities assumed at the acquisition date.


	ASSETS
	Short-term investments, available-for-sale, at fair value		$	33,535
	Short-term investments, trading, at fair value			12,526
	Fixed maturities, available-for-sale, at fair value			156,142
	Fixed maturities, trading, at fair value			10,751

	Total investments			212,954
	Cash and cash equivalents			44,842
	Restricted cash and cash equivalents			12,305
	Premiums receivable			41,855
	Reinsurance balances recoverable			32,375
	Deferred premium			26,224
	Funds withheld			19,579
	Intangibles			90,000
	Other assets			7,977

	TOTAL ASSETS			488,111

	LIABILITIES
	Losses and loss adjustment expenses			216,319
	Insurance and reinsurance balances payable			20,834
	Unearned premium			42,738
	Deferred taxes			39,740
	Other liabilities			49,328

	TOTAL LIABILITIES			368,959

NET ASSETS ACQUIRED AT FAIR VALUE			119,152
Goodwill			38,848

ACQUISITION DATE FAIR VALUE		$	158,000

The net unearned premiums acquired include a decrease of $16.7 million to adjust net unearned premiums to fair value. This fair value adjustment is included within unearned premiums on the consolidated balance sheet. This amount will be amortized to acquisition costs in the consolidated statements of earnings and comprehensive income over the next two years. The amortization approximates the amount of Atrium’s deferred acquisition costs that would have been recognized as acquisition costs had they not been fair valued under acquisition accounting. As at December 31, 2013, the remaining balance of the fair value adjustment was $16.7 million.

The following table summarizes the provisional intangible assets recorded in connection with the acquisition:


		Amount				Economic
		Amount				Useful Life
Syndicate capacity		$	32,900			Indefinite
Management contract			30,100			Indefinite
Distribution channel			20,000			15 Years
Brand			7,000			10 years

Intangible assets as of the acquisition date		$	90,000

The fair value of the Lloyd’s syndicate capacity was estimated using the multi-period excess-earnings method, a form of the income approach. Lloyd’s syndicate capacity represents Atrium’s authorized premium income limit to write insurance business in the Lloyd’s market. Atrium’s proportionate share of S609, (the syndicate through which it conducts its Lloyd’s operations) is approximately 25%. The capacity is renewed annually at no cost to the Company but may be freely purchased or sold, subject to Lloyd’s approval. The ability to write insurance business within the syndicate capacity is indefinite with the premium income limit being set annually by the Company, subject to Lloyd’s approval.
Atrium provides underwriting, actuarial and support services to S609 pursuant to a management contract. The fair value of the management contract was estimated using the income approach.
Distribution channels represent broker relationships and the network of insurance companies through which Atrium conducts its operations. The fair value of Atrium’s distribution channel was estimated using the income approach. Critical inputs into the valuation model for customer relationships and broker relationships include estimates of expected premium and attrition rates, and discounting at a weighted average cost of capital. Brand represents the intangible asset related to the name and was valued using the income approach.
From the date of acquisition to December 31, 2013, the Company earned premiums of $10.7 million, recorded losses incurred of $7.2 million on those earned premiums, and recorded $2.5 million in net earnings related to Atrium in its consolidated statement of earnings.
Arden
On September 9, 2013, Kenmare, the Company’s wholly-owned subsidiary, together with Trident, completed the acquisition of Arden. Northshore, the purchaser of Arden, is 60% owned by Kenmare and 40% owned by Trident. Arden is a Bermuda-based reinsurance company that provides reinsurance to Atrium and is currently in the process of running off certain other discontinued businesses.
Results related to Arden’s reinsurance to Atrium are included within the Company’s active underwriting segment, while results related to Arden’s discontinued business are included within the Company’s non-life run-off segment.
The purchase price for Arden was $79.6 million. Kenmare’s portion of the purchase price was $47.8 million, and was financed by borrowings under the Company’s revolving credit facility.


Purchase price		$	79,600

Net assets acquired at fair value		$	79,600


The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


		Active				Non-life				Total
		Underwriting				Run-off				Total
ASSETS
Short-term investments, trading, at fair value		$	16,340			$	12,512			$	28,852
Fixed maturities, trading, at fair value			9,351				46,077				55,428
Other investments			—				2,867				2,867

Total investments			25,691				61,456				87,147
Cash and cash equivalents			—				23,037				23,037
Restricted cash and cash equivalents			10,213				21,599				31,812
Premiums receivable			74,452				49,769				124,221
Reinsurance balances recoverable			—				354,810				354,810
Other assets			—				12,016				12,016

TOTAL ASSETS			110,356				522,687				633,043

LIABILITIES
Losses and loss adjustment expenses			56,160				427,567				483,727
Insurance and reinsurance balances payable			—				59,304				59,304
Unearned premium			—				10,412				10,412

TOTAL LIABILITIES			56,160				497,283				553,443

NET ASSETS ACQUIRED AT FAIR VALUE		$	54,196			$	25,404			$	79,600

From the date of acquisition to December 31, 2013, the Company earned premiums of $21.3 million, recorded losses incurred of $11.8 million on those earned premiums, and recorded $9.8 million in net earnings related to Arden in its consolidated statement of earnings.
Pavonia
On March 31, 2013, the Company and its wholly-owned subsidiary, Pavonia Holdings (US), Inc., completed the acquisition of all of the shares of Household Life Insurance Company of Delaware (“HLIC DE”) and HSBC Insurance Company of Delaware (“HSBC DE”) from Household Insurance Group Holding Company, a subsidiary of HSBC Holdings plc. HLIC DE and HSBC DE are both Delaware-domiciled insurers in run-off. HLIC DE owns three other insurers domiciled in Michigan, New York, and Arizona, which are also in run-off (collectively with HLIC DE and HSBC DE, the “Pavonia companies”). The aggregate cash purchase price was $155.6 million and was financed in part by a drawing of $55.7 million under the Company’s revolving credit facility. The Pavonia companies wrote various U.S. and Canadian life insurance, including credit life and disability insurance, term life insurance, assumed life reinsurance and annuities.
The purchase price and fair value of the assets acquired in the Pavonia acquisition were as follows:


Purchase price		$	155,564

Net assets acquired at fair value		$	155,564


The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


ASSETS
Short-term investments, trading, at fair value		$	40,404
Short-term investments, held-to-maturity, at fair value			10,268
Fixed maturities, trading, at fair value			329,985
Fixed maturities, held-to-maturity, at fair value			876,474

Total investments			1,257,131
Cash and cash equivalents			81,849
Accrued interest receivable			15,183
Funds held by reinsured companies			47,761
Other assets			59,002

TOTAL ASSETS			1,460,926

LIABILITIES
Policyholder benefits for life and annuity contracts			1,255,632
Reinsurance balances payable			39,477
Unearned premium			5,618
Other liabilities			4,635

TOTAL LIABILITIES			1,305,362

NET ASSETS ACQUIRED AT FAIR VALUE		$	155,564

As of March 31, 2013, the date of acquisition of the Pavonia companies, all of the companies were either in run-off or, immediately following the acquisition, were placed into run-off, and accordingly are no longer writing any new policies. The Pavonia companies will continue to collect premiums in relation to the unexpired policies assumed on acquisition.
For the period from the date of the acquisition to December 31, 2013, the Company had earned premiums of $92.2 million, recorded life and annuity benefits and acquisition costs of $88.6 million on those earned premiums, and recorded $3.7 million in net earnings related to the Pavonia companies in its consolidated statement of earnings.
SeaBright
On February 7, 2013, the Company completed its acquisition of SeaBright, through the merger of its indirect, wholly-owned subsidiary, AML Acquisition, Corp. (“AML Acquisition”), with and into SeaBright (the “Merger”), with SeaBright surviving the Merger as the Company’s indirect, wholly-owned subsidiary. SeaBright owns SeaBright Insurance Company, an Illinois-domiciled insurer that is commercially domiciled in California, which wrote direct workers’ compensation business. The aggregate cash purchase price paid by the Company for all equity securities of SeaBright was approximately $252.1 million, which was funded in part with $111.0 million borrowed under a four-year term loan facility provided by National Australia Bank (“NAB”) and Barclays Bank PLC.
Immediately following the acquisition, SeaBright was placed into run-off, and accordingly is no longer writing new insurance policies. Since its acquisition, SeaBright had renewed expiring insurance policies when it was obligated to do so by regulators, but has received approvals from all states relieving it of this obligation to renew any further policies.

The purchase price and fair value of the assets acquired in the SeaBright acquisition were as follows:


Purchase price		$	252,091

Net assets acquired at fair value		$	252,091

The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


ASSETS
Short-term investments, trading, at fair value		$	25,171
Fixed maturities, trading, at fair value			683,780

Total investments			708,951
Cash and cash equivalents			41,846
Accrued interest receivable			6,344
Premiums receivable			112,510
Reinsurance balances recoverable			117,462
Other assets			4,515

TOTAL ASSETS			991,628

LIABILITIES
Losses and loss adjustment expenses			592,774
Unearned premium			93,897
Loans payable			12,000
Insurance balances payable			3,243
Other liabilities			37,623

TOTAL LIABILITIES			739,537

NET ASSETS ACQUIRED AT FAIR VALUE		$	252,091

The net unearned premiums acquired include a decrease of $14.4 million to adjust net unearned premiums to fair value. This fair value adjustment is included within unearned premiums on the consolidated balance sheet. This amount has been amortized to acquisition costs in the consolidated statements of earnings during 2013. The amortization approximates the amount of SeaBright’s deferred acquisition costs that would have been recognized as acquisition costs had they not been fair valued under acquisition accounting. As at December 31, 2013, this fair value adjustment was fully amortized.
Gross and net premiums written by SeaBright from the date of the acquisition to December 31, 2013 totaled $17.8 million and $9.2 million, respectively. Because SeaBright’s exit from the mandatory renewal process was approved, the Company expects that SeaBright will no longer generate premiums written other than for small adjustments related to premium audits and reinstatement premiums on previously written policies.
From the date of acquisition to December 31, 2013, the Company earned premiums of $112.8 million, recorded losses incurred and acquisition costs of $86.6 million on those earned premiums, and recorded $3.5 million in net losses related to SeaBright in its consolidated statement of earnings.
Pro Forma Financial Information — Atrium, Arden and the Pavonia companies (Unaudited)
The following pro forma condensed combined statement of earnings for the years ended December 31, 2013 and 2012 combines the historical consolidated statements of earnings of the Company (inclusive of those of SeaBright since its acquisition on February 7, 2013) with those of Atrium, Arden and Pavonia, giving effect to the business combinations and related transactions of Atrium, Arden and Pavonia as if they had occurred on January 1, 2013 and 2012, respectively. For the year ended December 31, 2013, the results shown for Atrium, Arden and Pavonia represent their results from January 1, 2013 to the respective date of each acquisition. The results for Atrium, Arden and Pavonia post-acquisition are included in the results shown for the Company.
The pro forma financial information presented below is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisitions of Atrium, Arden and the Pavonia companies had taken place on January 1, 2013 or 2012, respectively.


						Unaudited
Twelve Months Ended December 31, 2013		Enstar Group				Atrium				Arden				Pavonia				Pro forma			Enstar Group
		Limited																Adjustments			Limited - Pro
																					Forma
Total income		$	416,570			$	91,126			$	15,911			$	48,275			$	—		$	571,882
Total expenses			(192,748	)			(68,545	)			(18,783	)			(48,094	)			(9,531	)		(337,701	)
Noncontrolling interest			(15,218	)			—				—				—				(7,170	)		(22,388	)

Net earnings		$	208,604			$	22,581			$	(2,872	)		$	181			$	(16,701	)	$	211,793

Net earnings per ordinary																					$	12.82
share —basic																					$	12.82

Net earnings per ordinary																					$	12.68
share —diluted																					$	12.68

Weighted average ordinary shares outstanding — basic																						16,523,369

Weighted average ordinary shares outstanding — diluted																						16,703,442

Summary of the Pro Forma Adjustments to the Pro Forma Condensed Combined Statement of Earnings for the Twelve Months Ended December 31, 2013 (Unaudited):


				Unaudited
Expenses				Atrium				Arden				Pavonia				Total
(i)		Adjustment to interest expense to reflect the financing costs of the acquisition for the year		$	(3,105	)		$	(1,111	)		$	(442	)		$	(4,658	)
(ii)		Adjustment to recognize amortization of definite lived intangible assets			(2,033	)			(218	)			(2,825	)			(5,076	)
(iii)		Net adjustment related to the unlocking and reassessment of the actuarial estimates of the business acquired			—				—				(2,166	)			(2,166	)
(iv)		Adjustment to income taxes for pro forma adjustments			467				—				1,902				2,369

				$	(4,671	)		$	(1,329	)		$	(3,531	)		$	(9,531	)
(v)		Adjustment to noncontrolling interest for pro forma adjustments		$	(8,406	)		$	1,236			$	—			$	(7,170	)


						Unaudited
Twelve Months Ended December 31, 2012		Enstar Group				Atrium				Arden				Pavonia				Pro forma			Enstar Group
		Limited																Adjustments			Limited - Pro
																					Forma
Total income		$	163,453			$	82,343			$	199,939			$	280,227			$	—		$	725,962
Total expenses			28,066				(52,277	)			(108,185	)			(267,983	)			(21,855	)		(422,234	)
Noncontrolling interest			(23,502	)			—				—				—				(47,971	)		(71,473	)

Net earnings		$	168,017			$	30,066			$	91,754			$	12,244			$	(69,826	)	$	232,255

Net earnings per ordinary share — basic																					$	14.13

Net earnings per ordinary																					$	13.96
share — diluted																					$	13.96

Weighted average ordinary shares outstanding — basic																						16,441,461

Weighted average ordinary shares outstanding — diluted																						16,638,021

Summary of the Pro Forma Adjustments to the Pro Forma Condensed Combined Statement of Earnings for the Twelve Months Ended December 31, 2012 (Unaudited):


				Unaudited
Expenses				Atrium				Arden				Pavonia				Total
(i)		Adjustment to interest expense to reflect the financing costs of the acquisition for the year		$	(3,685	)		$	(1,854	)		$	(2,227	)		$	(7,766	)
(ii)		Adjustment to recognize amortization of definite lived intangible assets			(2,033	)			(327	)			(11,300	)			(13,660	)
(iii)		Net adjustment related to the unlocking and reassessment of the actuarial estimates of the business acquired			—				—				(8,664	)			(8,664	)
(iv)		Adjustment to income taxes for pro forma adjustments			468				—				7,767				8,235

				$	(5,250	)		$	(2,181	)		$	(14,424	)		$	(21,855	)
(v)		Adjustment to noncontrolling interest for pro forma adjustments		$	(11,400	)		$	(36,571	)		$	—			$	(47,971	)
2011
Clarendon
On July 12, 2011, the Company, through its wholly-owned subsidiary, Clarendon Holdings, Inc., completed the acquisition of 100% of the shares of Clarendon National Insurance Company (“Clarendon”) from Clarendon Insurance Group, Inc., an affiliate of Hannover Re (“Hannover”). Clarendon is a New Jersey-domiciled insurer that is in run-off. Clarendon owns three other insurers, two domiciled in New Jersey and one domiciled in Florida, that are also in run-off. The purchase price was $219.1 million and was financed in part by $106.5 million under a four-year term loan facility provided by NAB and the remainder from available cash on hand.

In addition, on July 12, 2011, the Company, through its wholly-owned subsidiary, Fitzwilliam Insurance Limited (“Fitzwilliam”), in connection with the acquisition of Clarendon, entered into a reinsurance agreement with Hannover, which provides adverse development cover (“ADC”) to Clarendon to reinsure Hannover for the first $80.0 million of the ADC. The Company provided a parental guarantee to Hannover in the amount of $80.0 million supporting the obligations of Fitzwilliam.
The purchase price and fair value of the assets acquired in the Clarendon acquisition were as follows:


Purchase price		$	219,077

Net assets acquired at fair value		$	219,077

The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


ASSETS
Short-term investments, trading		$	60,376
Fixed maturities, trading			623,530
Equities			5,014

Total investments			688,920
Cash and cash equivalents			138,518
Restricted cash and cash equivalents			7,198
Reinsurance balances recoverable			1,065,341
Accrued interest and other receivables			9,655

TOTAL ASSETS			1,909,632

LIABILITIES
Losses and loss adjustment expenses			1,654,436
Insurance and reinsurance balances payable			1,942
Funds withheld			26,277
Accounts payable			7,900

TOTAL LIABILITIES			1,690,555

NET ASSETS ACQUIRED AT FAIR VALUE		$	219,077

Laguna
On March 25, 2011, the Company, through its wholly-owned subsidiary, Kenmare, completed the acquisition of Laguna Life Limited, formerly known as CitiLife Financial Limited (“Laguna”), from Citigroup Insurance Holding Corporation (“Citigroup”), an affiliate of Citigroup Inc. Laguna is an Ireland-based life insurer that is in run-off. The purchase price was €15.0 million (approximately $21.2 million) and was funded from available cash on hand. The originally disclosed purchase price of €30.0 million (approximately $42.4 million) was reduced, prior to completion of the acquisition, after Citigroup received approval from Laguna’s regulator to distribute €15.0 million (approximately $21.2 million) to its shareholders.
The purchase price and fair value of the net assets acquired in the Laguna acquisition were as follows:


Purchase price		$	21,223

Net assets acquired at fair value		$	34,328

Excess of net assets over purchase price (gain on bargain purchase)		$	(13,105	)


The gain on bargain purchase of approximately $13.1 million, relating to the acquisition of Laguna, arose primarily as a result of the reassessment by the Company, upon acquisition, of the total required estimated costs to manage the business to expiry. The Company’s assessment of costs was lower than the acquired costs recorded by the vendor in the financial statements of Laguna.
The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


ASSETS
Short-term investments, trading		$	1,154
Fixed maturities, trading			30,765

Total investments			31,919
Cash and cash equivalents			13,274
Reinsurance balances recoverable			1,459
Other assets			1,325

TOTAL ASSETS			47,977

LIABILITIES
Losses and loss adjustment expenses			11,898
Accounts payable			1,751

TOTAL LIABILITIES			13,649

NET ASSETS ACQUIRED AT FAIR VALUE		$	34,328

Significant_New_Business

Significant New Business	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Significant New Business	'
	4	SIGNIFICANT NEW BUSINESS
	2014
	Shelbourne RITC Transactions
	The Company, through its wholly-owned U.K.-based subsidiary, Shelbourne Group Limited (“Shelbourne”), invests in reinsurance to close contract (“RITC”) transactions (the transferring of liabilities from one Lloyd’s syndicate to another) with Lloyd’s of London insurance and reinsurance syndicates in run-off. Shelbourne was originally formed in December 2007 in conjunction with other investors. Shelbourne owns 100% of Shelbourne Syndicate Services Limited, the Managing Agency for Lloyd’s Syndicate 2008 (“S2008”), a syndicate approved by Lloyd’s of London on December 16, 2007 to undertake RITC transactions with Lloyd’s syndicates in run-off.
	Effective January 1, 2014, S2008 entered into an RITC transaction with another Lloyd’s syndicate in respect of its 2011 and prior underwriting years of account, under which S2008 assumed net insurance reserves of approximately £15.3 million (approximately $25.3 million) for consideration of an approximately equal amount.
	Reciprocal of America
	On July 6, 2012, PWIC entered into a definitive loss portfolio transfer reinsurance agreement with Reciprocal of America (in Receivership) and its Deputy Receiver relating to a portfolio of workers’ compensation business. The estimated total liabilities to be assumed are approximately $169.0 million, with an equivalent amount of assets to be received as consideration. Completion of the transaction is conditioned upon, among other things, regulatory approvals and satisfaction of customary closing conditions. The transaction is expected to close in the second quarter of 2014.

	2013
	Shelbourne RITC Transactions
	Effective January 1, 2013, Lloyd’s Syndicate 2008 entered into a RITC of the 2009 underwriting year of account of another Lloyd’s syndicate and a 100% quota share reinsurance agreement with a further Lloyd’s syndicate in respect of its 2010 underwriting year of account, under which S2008 assumed total gross insurance reserves of approximately £33.8 million (approximately $51.4 million) for consideration of an equal amount.
	American Physicians
	On April 26, 2013, the Company, through its wholly-owned subsidiary, Providence Washington Insurance Company (“PWIC”), completed the assignment and assumption of a portfolio of workers’ compensation business from American Physicians Assurance Corporation and APSpecialty Insurance Company (collectively “APS”). Total assets and liabilities assumed were approximately $35.3 million.
	2012
	Claremont
	On August 6 and December 17, 2012, the Company, through Fitzwilliam, entered into novation agreements with Claremont and two of Claremont’s reinsurers with respect to their existing quota share contracts. Under the novation agreements, Fitzwilliam replaced the reinsurers on the quota share contracts in exchange for total assets and liabilities of approximately $38.0 million.
	Zurich Danish Portfolio
	On June 30, 2012, the Company, through the Danish branch of its wholly-owned subsidiary, Marlon Insurance Company Limited (“Marlon”), acquired, by way of loss portfolio transfer under Danish law, a portfolio of reinsurance and professional disability business from the Danish branch of Zurich Insurance Company (“Zurich”). Marlon received total assets and assumed liabilities of approximately $60.0 million.
	Shelbourne RITC Transactions
	On January 1, 2012, S2008 transferred the assets and liabilities relating to its 2009 and prior underwriting years of account into its 2010 underwriting year of account by means of an RITC transaction. Following the transfer, the existing noncontrolling interest held by its other investors ceased, resulting in the Company now providing 100% of the underwriting capacity for S2008.
	Effective December 31, 2012, S2008 entered into a 100% quota share reinsurance agreement with another Lloyd’s syndicate in respect of its 2009 and prior years of account (the “2009 Liabilities”), under which S2008 assumed total gross insurance reserves of approximately £193.0 million (approximately $313.3 million) for consideration of an equal amount. Effective January 1, 2014, the 2012 Lloyd’s underwriting year of account of S2008 entered into a partial RITC transaction with respect to the 2009 liabilities.
	2011
	Insurance Australia Group
	On September 20, 2011, the Company, through its wholly-owned subsidiary, Gordian Run-off Limited (“Gordian”), acquired an inwards reinsurance portfolio from Insurance Australia Group Limited via an Australian Federal Court approved scheme. Gordian received total assets and assumed total net reinsurance liabilities of approximately 9.7 million Australian dollars (approximately $10.0 million).

	Claremont
	On September 1, 2011, the Company, through Fitzwilliam, entered into a novation agreement with Claremont and certain of its reinsurers with respect to three specific quota share contracts. Under the novation agreement, Fitzwilliam replaced those companies as reinsurer of Claremont on the quota share contracts, assuming liabilities of $22.5 million and receiving assets of an equal amount.
	Shelbourne RITC Transactions
	In February 2011, S2008 entered into RITC agreements with two Lloyd’s syndicates assuming total gross insurance reserves of approximately $129.6 million for consideration of an equal amount.

Investments

Investments	12 Months Ended
Investments	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Investments	'
	5	INVESTMENTS
	Trading
	The estimated fair values of the Company’s investments in fixed maturity securities, short-term investments and equities classified as trading securities were as follows:


			December 31,			December 31,
			2013			2012
	U.S. government and agency		$	439,946		$	361,906
	Non-U.S. government			476,224			265,722
	Corporate			2,123,675			1,598,876
	Municipal			41,034			20,446
	Residential mortgage-backed			218,457			115,594
	Commercial mortgage-backed			114,637			130,848
	Asset-backed			248,748			78,929

	Total fixed maturity and short-term investments			3,662,721			2,572,321
	Equities — U.S.			115,285			92,406
	Equities — International			66,748			22,182

			$	3,844,754		$	2,686,909

	Included within residential and commercial mortgage-backed securities as at December 31, 2013 were securities issued by U.S. governmental agencies with a fair value of $177.9 million (as at December 31, 2012: $68.4 million within residential and commercial mortgage-backed securities).
	The following tables set forth certain information regarding the credit ratings (provided by major rating agencies) of the Company’s fixed maturity securities and short-term investments classified as trading:


	As at December 31, 2013		Fair Value			% of Total
	As at December 31, 2013		Fair Value			Fair Value
	AAA		$	502,057			13.7	%
	AA			1,430,107			39.1	%
	A			1,191,142			32.5	%
	BBB or lower			461,614			12.6	%
	Not Rated			77,801			2.1	%

			$	3,662,721			100	%



	As at December 31, 2012		Fair Value			% of Total
	As at December 31, 2012		Fair Value			Fair Value
	AAA		$	418,297			16.3	%
	AA			958,267			37.2	%
	A			812,428			31.6	%
	BBB or lower			376,347			14.6	%
	Not Rated			6,982			0.3	%

			$	2,572,321			100	%

	Held-to-maturity
	The Company holds a portfolio of held-to-maturity securities to support the Pavonia annuity business. The amortized cost and estimated fair values of the Company’s fixed maturity securities classified as held-to-maturity were as follows:


	As at December 31, 2013		Amortized			Gross				Gross				Fair Value
			Cost			Unrealized				Unrealized
						Holding				Holding
						Gains				Losses
										Non-OTTI
	U.S. government and agency		$	19,992		$	6			$	(1,866	)		$	18,132
	Non-U.S. government			23,592			19				(1,284	)			22,327
	Corporate			815,803			105				(56,808	)			759,100

			$	859,387		$	130			$	(59,958	)		$	799,559

	As at December 31, 2013, none of these securities were considered to be other-than-temporarily impaired.
As at December 31, 2012, the Company had no investments classified as held-to-maturity.
The contractual maturities of the Company’s fixed maturity securities classified as held-to-maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.


As at December 31, 2013		Amortized			Fair				% of Total
As at December 31, 2013		Cost			Value				Fair Value
Due in one year or less		$	17,541		$	17,579				2.2	%
Due after one year through five years			87,698			86,611				10.8	%
Due after five years through ten years			133,102			126,541				15.8	%
Due after ten years			621,046			568,828				71.2	%

		$	859,387		$	799,559				100	%


The following table set forth certain information regarding the credit ratings (provided by major rating agencies) of the Company’s fixed maturity securities classified as held-to-maturity:


As at December 31, 2013		Amortized			Fair				% of Total
As at December 31, 2013		Cost			Value				Fair Value
AAA		$	47,949		$	44,552				5.6	%
AA			259,163			239,188				29.9	%
A			496,986			463,001				57.9	%
BBB or lower			54,759			52,282				6.5	%
Not Rated			530			536				0.1	%

		$	859,387		$	799,559				100	%

Available-for-sale
The amortized cost and estimated fair values of the Company’s fixed maturity securities and short-term investments classified as available-for-sale were as follows:


As at December 31, 2013		Amortized			Gross				Gross				Fair
		Cost			Unrealized				Unrealized				Value
					Holding				Holding
					Gains				Losses
									Non-OTTI
U.S. government and agency		$	28,050		$	303			$	(10	)		$	28,343
Non-U.S. government			84,443			1,871				(22	)			86,292
Corporate			76,942			1,221				(259	)			77,904
Residential mortgage-backed			17,523			102				(118	)			17,507
Asset-backed			36,344			4				(30	)			36,318

		$	243,302		$	3,501			$	(439	)		$	246,364



As at December 31, 2012		Amortized			Gross				Gross				Fair
		Cost			Unrealized				Unrealized				Value
					Holding				Holding
					Gains				Losses
									Non-OTTI
U.S. government and agency		$	4,503		$	454			$	—			$	4,957
Non-U.S. government			120,634			3,373				(151	)			123,856
Corporate			115,139			2,379				(524	)			116,994
Residential mortgage-backed			4,308			230				(40	)			4,498
Commercial mortgage-backed			474			7				—				481
Asset-backed			338			9				(12	)			335

		$	245,396		$	6,452			$	(727	)		$	251,121

Included within residential mortgage-backed securities as at December 31, 2013 were securities issued by U.S. governmental agencies with a fair value of $12.5 million (as at December 31, 2012: $3.5 million within residential and commercial mortgage-backed securities).

The following tables summarize the Company’s fixed maturity securities and short-term investments classified as available-for-sale in an unrealized loss position as well as the aggregate fair value and gross unrealized loss by length of time the securities have continuously been in an unrealized loss position:


		12 Months or Greater							Less Than 12 Months							Total
As at December 31, 2013		Fair			Unrealized				Fair				Unrealized			Fair		Unrealized
As at December 31, 2013		Value			Losses				Value				Losses			Value		Losses
U.S. government and agency		$	—		$	—			$	11,416			$	(10	)	$	11,416	$	(10	)
Non-U.S. government			—			—				20,406				(22	)		20,406		(22	)
Corporate			—			—				51,478				(259	)		51,478		(259	)
Residential mortgage-backed			—			—				13,632				(118	)		13,632		(118	)
Asset-backed			—			—				24,898				(30	)		24,898		(30	)

		$	—			—			$	121,830			$	(439	)	$	121,830	$	(439	)



		12 Months or Greater							Less Than 12 Months							Total
As at December 31, 2012		Fair			Unrealized				Fair				Unrealized			Fair		Unrealized
As at December 31, 2012		Value			Losses				Value				Losses			Value		Losses
Non-U.S. government		$	2,646		$	(82	)		$	2,399			$	(69	)	$	5,045	$	(151	)
Corporate			13,936			(86	)			8,689				(438	)		22,625		(524	)
Residential mortgage-backed			1,124			(40	)			—				—			1,124		(40	)
Asset-backed			174			(12	)			—				—			174		(12	)

		$	17,880		$	(220	)		$	11,088			$	(507	)	$	28,968	$	(727	)

As at December 31, 2013 and 2012, the number of securities classified as available-for-sale in an unrealized loss position was 135 and 30, respectively, with a fair value of $121.8 million and $29.0 million, respectively. The increase in the number of these securities was due primarily to investment portfolios acquired in connection with acquisitions completed during 2013. Of these securities, the number of securities that had been in an unrealized loss position for twelve months or longer was 2 and 23, respectively. As of December 31, 2013, none of these securities were considered to be other than temporarily impaired.
The contractual maturities of the Company’s fixed maturity securities and short-term investments classified as available-for-sale are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.


As at December 31, 2013		Amortized			Fair				% of Total
As at December 31, 2013		Cost			Value				Fair Value
Due in one year or less		$	45,295		$	45,596				18.5	%
Due after one year through five years			141,400			143,445				58.2	%
Due after five years through ten years			69			70				0.1	%
Due after ten years			2,671			3,428				1.4	%

			189,435			192,539				78.2	%
Residential mortgage-backed			17,523			17,507				7.1	%
Asset-backed			36,344			36,318				14.7	%

		$	243,302		$	246,364				100	%



As at December 31, 2012		Amortized			Fair				% of Total
As at December 31, 2012		Cost			Value				Fair Value
Due in one year or less		$	173,113		$	173,949				69.3	%
Due after one year through five years			64,089			68,298				27.2	%
Due after ten years			3,074			3,560				1.4	%

			240,276			245,807				97.9	%
Residential mortgage-backed			4,308			4,498				1.8	%
Commercial mortgage-backed			474			481				0.2	%
Asset-backed			338			335				0.1	%

		$	245,396		$	251,121				100	%

The following tables set forth certain information regarding the credit ratings (provided by major rating agencies) of the Company’s fixed maturity securities and short-term investments classified as available-for-sale:


As at December 31, 2013		Amortized			Fair				% of Total
As at December 31, 2013		Cost			Value				Fair Value
AAA		$	125,729		$	127,433				51.7	%
AA			74,692			75,181				30.5	%
A			33,834			34,607				14.1	%
BBB or lower			8,957			8,963				3.6	%
Not Rated			90			180				0.1	%

		$	243,302		$	246,364				100	%



As at December 31, 2012		Amortized			Fair				% of Total
As at December 31, 2012		Cost			Value				Fair Value
AAA		$	107,615		$	110,829				44.1	%
AA			59,535			60,742				24.2	%
A			72,773			73,935				29.4	%
BBB or lower			5,281			5,197				2.1	%
Not Rated			192			418				0.2	%

		$	245,396		$	251,121				100	%

Other-Than-Temporary Impairment Process
The Company assesses whether declines in the fair value of its fixed maturity investments classified as available-for-sale and held-to-maturity represent impairment losses that are other-than-temporary and whether a credit loss exists in accordance with its accounting policies. In assessing whether it is more likely than not that the Company will be required to sell a fixed maturity investment before its anticipated recovery, the Company considers various factors including its future cash flow requirements, legal and regulatory requirements, the level of its cash, cash equivalents, short-term investments and fixed maturity investments available-for-sale in an unrealized gain position, and other relevant factors. For the year ended December 31, 2013, the Company did not recognize any other-than-temporary impairment losses due to required sales. The Company determined that, as at December 31, 2013, no credit losses existed.

Other Investments
The estimated fair values of the Company’s other investments were as follows:


		December 31,			December 31,
		2013			2012
Private equity funds		$	161,229		$	127,696
Fixed income funds			194,375			156,235
Fixed income hedge funds			68,157			53,933
Equity funds			109,355			55,881
Real estate debt fund			32,113			16,179
Other			4,064			4,921

		$	569,293		$	414,845

Private equity funds
This class comprises several private equity funds that invest primarily in the financial services industry. All of the Company’s investments in private equity funds are subject to restrictions on redemptions and sales that are determined by the governing documents and limit the Company’s ability to liquidate those investments. These restrictions have been in place since the dates the initial investments were made by the Company.
As of December 31, 2013 and December 31, 2012, the Company had $161.2 million and $127.7 million, respectively, of other investments recorded in private equity funds, which represented 2.5% and 3.0% of total investments, cash and cash equivalents and restricted cash and cash equivalents at December 31, 2013 and December 31, 2012, respectively. Due to a lag in the valuations reported by the managers, the Company records changes in the investment value with up to a three-month lag. Management regularly reviews and discusses fund performance with their fund managers to corroborate the reasonableness of the reported net asset values and to assess whether any events have occurred within the lag period that would affect the valuation of the investments.
Fixed income funds
This class comprises a number of positions in diversified fixed income funds that are managed by third party managers. Underlying investments vary from high grade corporate bonds to non-investment grade senior secured loans and bonds, but are generally invested in liquid fixed income markets. These funds have regularly published prices. The funds have liquidity terms that vary from daily to monthly.
Fixed income hedge funds
This class comprises hedge funds that invest in a diversified portfolio of debt securities. The hedge funds are not currently eligible for redemption due to imposed lock-up periods of three years from the time of the Company’s initial investment. Once eligible, redemptions will be permitted quarterly with 90 days’ notice. The earliest date at which the funds will be eligible for redemption is March 2014.
Equity funds
This class comprises equity funds that invest in a diversified portfolio of international publicly-traded equity securities.

Real estate debt fund
This class comprises a real estate debt fund that invests primarily in U.S. commercial real estate loans and securities. A redemption request for this fund can be made 10 days after the date of any monthly valuation; the fund states that it will make commercially reasonable efforts to redeem the investment within the next monthly period.
Other
This class primarily comprises a fund that provides loans to educational institutions throughout the U.S. and its territories. Through these investments, the Company participates in the performance of the underlying loan pools. This investment matures when the loans are paid down and cannot be redeemed before maturity.
Redemption restrictions on other investments
Certain funds included in other investments are subject to a lock-up period. A lock-up period refers to the initial amount of time an investor is contractually required to invest before having the ability to redeem the investment. Funds that do provide for periodic redemptions may, depending on the funds’ governing documents, have the ability to deny or delay a redemption request, which is called a “gate.” The fund may restrict redemptions because the aggregate amount of redemption requests as of a particular date exceeds a specified level. The gate is a method for executing an orderly redemption process that allows for redemption requests to be executed in a timely manner to reduce the possibility of adversely affecting the remaining investors in the fund. Typically, the imposition of a gate delays a portion of the requested redemption, with the remaining portion to be settled in cash sometime after the redemption date.
Certain funds included in other investments may be allowed to invest a portion of their assets in illiquid securities, such as private equity or convertible debt. In such cases, a common mechanism used is a “side-pocket,” whereby the illiquid security is assigned to a separate memorandum capital account or designated account. Typically, the investor loses its redemption rights in the designated account. Only when the illiquid security is sold, or is otherwise deemed liquid by the fund, may investors redeem their interest in the side-pocket.
At December 31, 2013, the Company had $3.2 million of investments subject to side-pockets ($nil as of December 31, 2012). Management has not made any adjustments to the fair value estimate reported by the fund managers for the side-pocketed investments.
The following tables present the fair value, unfunded commitments and redemption frequency for all other investments. These investments are all valued at net asset value as at December 31, 2013 and December 31, 2012:


December 31, 2013		Total Fair			Gated/Side				Investments				Unfunded			Redemption
		Value			Pocket				without Gates				Commitments			Frequency
					Investments				or Side Pockets
Private equity funds		$	161,229		$	—			$	161,229			$	113,585		Not eligible
Fixed income funds			194,375			—				194,375				—		Daily to monthly
Fixed income hedge funds			68,157			3,150				65,007				—		Quarterly after lock-up periods expire
Equity funds			109,355			—				109,355				—		Bi-monthly
Real estate debt fund			32,113			—				32,113				—		Monthly
Other			4,064			—				4,064				655		Not eligible

		$	569,293		$	3,150			$	566,143			$	114,240

December 31, 2012		Total Fair			Gated/Side				Investments				Unfunded			Redemption
		Value			Pocket				without				Commitments			Frequency
					Investments				Gates or
									Side
									Pockets
Private equity funds		$	127,696		$	—			$	127,696			$	86,936		Not eligible
Fixed income funds			156,235			—				156,235				—		Daily to monthly
Fixed income hedge funds			53,933			—				53,933				—		Quarterly after lock-up periods expire
Equity fund			55,881			—				55,881				—		Bi-monthly
Real estate debt fund			16,179			—				16,179				—		Monthly
Other			4,921			—				4,921				655		Not eligible

		$	414,845		$	—			$	414,845			$	87,591

Fair Value of Financial Instruments
Fair value is defined as the price at which to sell an asset or transfer a liability (i.e. the “exit price”) in an orderly transaction between market participants. The Company uses a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. The hierarchy is broken down into three levels as follows:

	•		Level 1 — Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Valuation adjustments and block discounts are not applied to Level 1 instruments.

	•		Level 2 — Valuations based on quoted prices in active markets for similar assets or liabilities, quoted prices for identical assets or liabilities in inactive markets, or for which significant inputs are observable (e.g. interest rates, yield curves, prepayment speeds, default rates, loss severities, etc.) or can be corroborated by observable market data.

	•		Level 3 — Valuations based on inputs that are unobservable and significant to the overall fair value measurement. The unobservable inputs reflect the Company’s own judgment about assumptions that market participants might use.
The following is a summary of valuation techniques or models the Company uses to measure fair value by asset and liability classes.
Fixed Maturity Investments
The Company’s fixed maturity portfolio is managed by the Company’s Chief Investment Officer and outside investment advisors with oversight from the Company’s Investment Committee. Fair values for all securities in the fixed maturities portfolio are independently provided by the investment custodians, investment accounting service providers and investment managers, each of which utilize internationally recognized independent pricing services. Interactive Data Corporation is, however, the main pricing service utilized to estimate the fair value measurements for the Company’s fixed maturity investments. The Company records the unadjusted price provided by the investment custodians, investment accounting service providers or the investment managers and validates this price through a process that includes, but is not limited to: (i) comparison of prices against alternative pricing sources; (ii) quantitative analysis (e.g. comparing the quarterly return for each managed portfolio to its target benchmark); (iii) evaluation of methodologies used by external parties to estimate fair value, including a review of the inputs used for pricing; and (iv) comparing the price to the Company’s knowledge of the current investment market. The Company’s internal price validation procedures and review of fair value methodology documentation provided by independent pricing services have not historically resulted in adjustment in the prices obtained from the pricing service.
The independent pricing services used by the investment custodians, investment accounting service providers and investment managers obtain actual transaction prices for securities that have quoted prices in active markets. For determining the fair value of securities that are not actively traded, in general, pricing services use “matrix pricing” in which the independent pricing service uses observable market inputs including, but not limited to, reported trades, benchmark yields, broker-dealer quotes, interest rates, prepayment speeds, default rates and such other inputs as are available from market sources to determine a reasonable fair value. In addition, pricing services use valuation models, using observable data, such as an Option Adjusted Spread model, to develop prepayment and interest rate scenarios. The Option Adjusted Spread model is commonly used to estimate fair value for securities such as mortgage-backed and asset-backed securities.
The following describes the techniques generally used to determine the fair value of the Company’s fixed maturity investments by asset class.

	•		U.S. government and agency securities consist of securities issued by the U.S. Treasury and mortgage pass-through agencies such as the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and other agencies. The significant inputs used to determine the fair value of these securities include the spread above the risk-free yield curve, reported trades and broker-dealer quotes. These are considered to be observable market inputs and, therefore, the fair values of these securities are classified within Level 2.

	•		Non-U.S. government securities consist of bonds issued by non-U.S. governments and agencies along with supranational organizations. The significant inputs used to determine the fair value of these securities include the spread above the risk-free yield curve, reported trades and broker-dealer quotes. These are considered to be observable market inputs and, therefore, the fair values of these securities are classified within Level 2.

	•		Corporate securities consist primarily of investment-grade debt of a wide variety of corporate issuers and industries. The fair values of these securities are determined using the spread above the risk-free yield curve, reported trades, broker-dealer quotes, benchmark yields, and industry and market indicators. These are considered observable market inputs and, therefore, the fair values of these securities are classified within Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, securities are classified within Level 3. As at December 31, 2013, the Company had one corporate security classified as Level 3.

	•		Municipal securities consist primarily of bonds issued by U.S.-domiciled state and municipal entities. The fair values of these securities are determined using the spread above the risk-free yield curve, reported trades, broker-dealer quotes and benchmark yields. These are considered observable market inputs and, therefore, the fair values of these securities are classified within Level 2.

	•		Asset-backed securities consist primarily of investment-grade bonds backed by pools of loans with a variety of underlying collateral. The significant inputs used to determine the fair value of these securities include the spread above the risk-free yield curve, reported trades, benchmark yields, broker-dealer quotes, prepayment speeds and default rates. These are considered observable market inputs and, therefore, the fair values of these securities are classified within Level 2.

	•		Residential and commercial mortgage-backed securities include both agency and non-agency originated securities. The significant inputs used to determine the fair value of these securities include the spread above the risk-free yield curve, reported trades, benchmark yields, broker-dealer quotes, prepayment speeds and default rates. These are considered observable market inputs and, therefore, the fair values of these securities are classified within Level 2. Where pricing is unavailable from pricing services, the Company obtains non-binding quotes from broker-dealers. This is generally the case when there is a low volume of trading activity and current transactions are not orderly. In this event, securities are classified within Level 3. As at December 31, 2013, the Company had no residential or commercial mortgage-backed securities classified as Level 3.
Equities
The Company’s equities are predominantly traded on the major exchanges and are primarily managed by two external advisors. The Company uses Interactive Data Corporation, an internationally recognized pricing service, to estimate the fair value for all of its equities. The Company’s equities are widely diversified and there is no significant concentration in any specific industry.
The Company has categorized all of its investments in equities as Level 1 investments because the fair values of these investments are based on quoted prices in active markets for identical assets or liabilities. Because their fair value estimates are based on observable market data, the Company has categorized its investments in preferred stock as Level 2, with the exception of one investment in preferred stock that has been categorized as Level 3.
Other investments
The Company has ongoing due diligence processes with respect to funds in which it invests and their managers. These processes are designed to assist the Company in assessing the quality of information provided by, or on behalf of, each fund and in determining whether such information continues to be reliable or whether further review is warranted. Certain funds do not provide full transparency of their underlying holdings; however, the Company obtains the audited financial statements for funds annually, and regularly reviews and discusses the fund performance with the fund managers to corroborate the reasonableness of the reported net asset values. The use of net asset value as an estimate of the fair value for investments in certain entities that calculate net asset value is a permitted practical expedient. While reported net asset value is the primary input to the review, when the net asset value is deemed not to be indicative of fair value, the Company may incorporate adjustments to the reported net asset value (and not use the permitted practical expedient) on an investment by investment basis. These adjustments may involve significant management judgment. As at December 31, 2013, there were no significant adjustments made to the reported net asset value.
For its investments in private equity funds, the Company measures fair value by obtaining the most recently provided capital statement from the external fund manager or third-party administrator. The funds calculate net asset value on a fair value basis. For all publicly-traded companies within these funds, the Company adjusts the reported net asset value based on the latest share price as of the Company’s reporting date. The Company has classified its investments in private equity funds as Level 3.
The fixed income funds and equity funds in which the Company invests have been classified as Level 2 investments because their fair value is estimated using the published net asset value and because the fixed income funds and equity funds are highly liquid.

For its investments in fixed income hedge funds, the Company measures fair value by obtaining the most recently published net asset value as advised by the external fund manager or third-party administrator. The investments in the funds are classified as Level 3.
The real estate debt fund in which the Company invests has been valued based on the most recent published net asset value. This investment has been classified as Level 3.
The Company’s remaining other investments are valued based on the latest available capital statements and have been classified as Level 3.
Fair Value Measurements
In accordance with the provisions of the Fair Value Measurement and Disclosure topic of the FASB Accounting Standards Codification (“ASC”) 820, the Company has categorized its investments that are recorded at fair value among levels as follows:


		December 31, 2013
		Quoted Prices in			Significant				Significant				Total Fair
		Active Markets for			Other Observable				Unobservable				Value
		Identical Assets			Inputs				Inputs
		(Level 1)			(Level 2)				(Level 3)
U.S. government and agency		$	—		$	468,289			$	—			$	468,289
Non-U.S. government			—			562,516				—				562,516
Corporate			—			2,200,970				609				2,201,579
Municipal			—			41,034				—				41,034
Residential mortgage-backed			—			235,964				—				235,964
Commercial mortgage-backed			—			114,637				—				114,637
Asset-backed			—			285,066				—				285,066
Equities — U.S.			97,470			13,090				4,725				115,285
Equities — International			35,677			31,071				—				66,748
Other investments			—			303,724				265,569				569,293

Total investments		$	133,147		$	4,256,361			$	270,903			$	4,660,411



		December 31, 2012
		Quoted Prices in			Significant				Significant				Total Fair
		Active Markets for			Other Observable				Unobservable				Value
		Identical Assets			Inputs				Inputs
		(Level 1)			(Level 2)				(Level 3)
U.S. government and agency		$	—		$	366,863			$	—			$	366,863
Non-U.S. government			—			389,578				—				389,578
Corporate			—			1,715,330				540				1,715,870
Municipal			—			20,446				—				20,446
Residential mortgage-backed			—			120,092				—				120,092
Commercial mortgage-backed			—			131,329				—				131,329
Asset-backed			—			79,264				—				79,264
Equities — U.S.			83,947			5,058				3,401				92,406
Equities — International			10,377			11,805				—				22,182
Other investments			—			212,115				202,730				414,845

Total investments		$	94,324		$	3,051,880			$	206,671			$	3,352,875


The following table presents the Company’s fair value hierarchy for those assets classified as held-to-maturity in the consolidated balance sheet but for which disclosure of the fair value is required as of December 31, 2013 (there were no assets classified as held-to-maturity as of December 31, 2012):


		December 31, 2013
		Quoted Prices in			Significant				Significant				Total Fair
		Active Markets for			Other Observable				Unobservable				Value
		Identical			Inputs				Inputs
		Assets			(Level 2)				(Level 3)
		(Level 1)
U.S. government and agency		$	—		$	18,132			$	—			$	18,132
Non-U.S. government			—			22,327				—				22,327
Corporate			—			759,100				—				759,100

Total investments		$	—		$	799,559			$	—			$	799,559

During 2013 and 2012, the Company had no transfers between Levels 1 and 2.
The following table presents a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs during the twelve months ended December 31, 2013:


		Fixed			Other				Equity				Total
		Maturity			Investments				Securities
		Investments
Level 3 investments as of January 1, 2013		$	540		$	202,730			$	3,401			$	206,671
Purchases			—			44,032				—				44,032
Sales			—			(28,568	)			—				(28,568	)
Total realized and unrealized gains through earnings			69			47,375				1,324				48,768
Net transfers into and/or (out of) Level 3			—			—				—				—

Level 3 investments as of December 31, 2013		$	609		$	265,569			$	4,725			$	270,903

The amount of net gains (losses) for the twelve months ended December 31, 2013 included in earnings attributable to the fair value of changes in assets still held at December 31, 2013 was $48.8 million. All of this amount was included in net realized and unrealized gains.
The following table presents a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs during the year ended December 31, 2012:


		Fixed			Other				Equity				Total
		Maturity			Investments				Securities
		Investments
Level 3 investments as of January 1, 2012		$	519		$	137,727			$	2,975			$	141,221
Purchases			—			63,732				—				63,732
Sales			—			(16,839	)			—				(16,839	)
Total realized and unrealized gains through earnings			21			18,110				426				18,557
Net transfers into and/or (out of) Level 3			—			—				—				—

Level 3 investments as of December 31, 2012		$	540		$	202,730			$	3,401			$	206,671


The amount of net gains (losses) for the twelve months ended December 31, 2012 included in earnings attributable to the fair value of changes in assets still held at December 31, 2012 was $18.6 million. All of this amount was included in net realized and unrealized gains.
Net Realized and Unrealized Gains
Components of net realized and unrealized gains (losses) for the years ended December 31, 2013, 2012 and 2011 were as follows:


		2013			2012				2011
Gross realized gains on available-for-sale securities		$	705		$	5,850			$	808
Gross realized losses on available-for-sale securities			(214	)		(727	)			(471	)
Net realized gains on trading securities			13,488			13,569				3,738
Net unrealized (losses) gains on trading securities			(13,791	)		23,541				3,945
Net realized and unrealized gains on other investments			70,463			31,379				1,194

Net realized and unrealized gains		$	70,651		$	73,612			$	9,214

Proceeds from sales and maturities of available-for-sale securities		$	196,507		$	353,913			$	445,052

Net Investment Income
Major categories of net investment income for the years ended December 31, 2013, 2012 and 2011 are summarized as follows:


		2013			2012				2011
Interest from fixed maturity investments		$	123,555		$	78,767			$	70,753
Interest from cash and cash equivalents and short-term investments			13,705			14,924				13,232
Net amortization of bond premiums and discounts			(51,505	)		(28,758	)			(25,245	)
Dividends from equities			4,923			2,961				1,786
Other investments			652			661				734
Interest on other receivables			2,001			6,887				6,572
Other income			2,999			5,229				3,118
Interest on deposits held with clients			3,650			1,368				1,188
Investment expenses			(6,685	)		(4,279	)			(3,462	)

		$	93,295		$	77,760			$	68,676


Restricted Assets
The Company is required to maintain investments and cash and cash equivalents on deposit with various regulatory authorities to support its insurance and reinsurance operations. The investments and cash and cash equivalents on deposit are available to settle insurance and reinsurance liabilities. The Company also utilizes trust accounts to collateralize business with its insurance and reinsurance counterparties. These trust accounts generally take the place of letter of credit requirements. The assets in trusts as collateral are primarily highly rated fixed maturity securities. The carrying value of the Company’s restricted assets, including restricted cash of $397.7 million and $300.0 million, as of December 31, 2013 and December 31, 2012 was as follows:


		December 31			December 31,
		2013			2012
Collateral in trust for third party agreements		$	2,002,374		$	570,391
Assets on deposit with regulatory authorities			608,940			212,012
Collateral for secured letter of credit facility			310,938			246,608

		$	2,922,252		$	1,029,011

The increase of approximately $1.89 billion in restricted assets related primarily to restricted assets acquired in connection with the Company’s acquisitions of SeaBright, Pavonia, Arden and Atrium.

Derivative_Instruments

Derivative Instruments	12 Months Ended
Derivative Instruments	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	6. DERIVATIVE INSTRUMENTS
	The Company uses foreign currency forward contracts as part of its overall foreign currency risk management strategy or to obtain exposure to a particular financial market, as well as for yield enhancement. These derivatives were not designated as hedging investments.
	The following table sets forth the estimated fair value of derivative instruments recorded within other assets on the condensed consolidated balance sheet as at December 31, 2013 and 2012, and realized gains (losses) on derivative instruments recorded in net earnings for the years ended December 31, 2013, 2012 and 2011:


	Foreign Exchange	Contract Date		Settlement Date		Contract		Settlement		Fair Value as at			Net Foreign
	Forward Contract					Amount		Amount		December 31,			Exchange
													Gains (Losses)
	2013
	Australian dollar		November 26, 2013		January 3, 2014		AU$45,000		$41,036	$	779		$	779
	U.S. dollar		1-Jul-13		3-Jan-14		$40,887		AU$45,000		(630	)		(630	)
	Australian dollar		February 8, 2012		10-May-13		AU$45,000		$36,099		—			303
	British pound		6-Mar-12		6-Mar-13		UKP17,000		$26,611		—			1,023

										$	149		$	1,475

	2012
	Australian dollar		8-Feb-12		10-May-13		AU$35,000		$36,099	$	(238	)	$	(238	)
	British pound		6-Mar-12		6-Mar-13		UKP17,000		$26,611		(1,023	)		(1,023	)
	Australian dollar		8-Feb-12		December 19, 2012		AU$25,000		$26,165		—			—

										$	(1,261	)	$	(1,261	)

	2011
	U.S. dollar		September 22, 2011		2-Dec-11		$33,973		AU$35,000	$	—		$	3,008
	Australian dollar		23-Aug-11		2-Dec-11		AU$35,000		$36,981		—			—
	Australian dollar		12-Oct-10		30-Jun-11		AU$45,000		$42,476		—			(1,917	)

										$	—		$	1,091

Reinsurance_Balances_Recoverab

Reinsurance Balances Recoverable	12 Months Ended
Reinsurance Balances Recoverable	Dec. 31, 2013
Insurance [Abstract]	'
Reinsurance Balances Recoverable	'
	7. REINSURANCE BALANCES RECOVERABLE


		2013											2012
		Non-life			Active			Life		Total			Non-life			Active		Life		Total
		Run-off			Underwriting			Life		Total			Run-off			Underwriting		Life		Total
	Recoverable from reinsurers on:
	Outstanding losses	$	788,705		$	10,777		$	28,556	$	828,038		$	665,303		$	—	$	—	$	665,303
	Losses incurred but not reported		402,675			9,887			782		413,344			295,922			—		—		295,922
	Fair value adjustments		(69,847	)		4,391			—		(65,456	)		(85,005	)		—		—		(85,005	)

	Total reinsurance reserves recoverable		1,121,533			25,055			29,338		1,175,926			876,220			—		—		876,220
	Paid losses recoverable		177,459			7,845			2,589		187,893			246,408			—		291		246,699

		$	1,298,992		$	32,900		$	31,927	$	1,363,819		$	1,122,628		$	—	$	291	$	1,122,919

	Non-life Run-off and Active Underwriting
	The Company’s acquired insurance and reinsurance subsidiaries, prior to acquisition, used retrocessional agreements to reduce their exposure to the risk of insurance and reinsurance assumed. The Company’s insurance and reinsurance subsidiaries remain liable to the extent that retrocessionaires do not meet their obligations under these agreements, and therefore, the Company evaluates and monitors concentration of credit risk among its reinsurers. Provisions are made for amounts considered potentially uncollectible.
	On an annual basis, Atrium purchases a tailored outwards reinsurance program designed to manage S609’s risk profile. In addition, Atrium maintains a quota share reinsurance agreement with Arden. The majority of Atrium’s total third party reinsurance cover is with Lloyd’s syndicates or other reinsurers rated A- or better.
	The fair value adjustments, determined on acquisition of insurance and reinsurance subsidiaries, are based on the estimated timing of loss and loss adjustment expense recoveries and an assumed interest rate equivalent to a risk free rate for securities with similar duration to the reinsurance recoverables acquired plus a spread to reflect credit risk, and are amortized over the estimated recovery period, as adjusted for accelerations in timing of payments as a result of commutation settlements.
	As of December 31, 2013 and 2012, the Company had, excluding reinsurance recoverables related to its life and annuities, reinsurance balances recoverable of $1.33 billion and $1.12 billion, respectively. The increase of $208.9 million in reinsurance balances recoverable was primarily a result of the completion of acquisitions in the year ended December 31, 2013 partially offset by commutations and cash collections made during the year.
	At December 31, 2013 and 2012, the provision for uncollectible reinsurance recoverable relating to reinsurance balances recoverable was $338.6 million and $343.9 million, respectively. To estimate the provision for uncollectible reinsurance recoverable, the balances are first allocated to applicable reinsurers which involve management judgment. As part of this process, ceded incurred but not reported (“IBNR”) reserves are allocated by reinsurer. The ratio of the provision for uncollectible reinsurance recoverable to total non-life run-off and active underwriting reinsurance balances recoverable (excluding provision for uncollectible reinsurance recoverable) as of December 31, 2013 decreased to 19.9% as compared to 23.4% as of December 31, 2012, primarily as a result of reinsurance balances recoverable of companies acquired during the year requiring minimal provisions for uncollectible reinsurance recoverable.
	Life and Annuities
	As at December 31, 2013, the reinsurance balances recoverable associated with the Company’s life and annuities business amounting to $31.9 million consisted of term life business ceded by Pavonia to reinsurers under various quota share arrangements. All of the reinsurers are rated A- and above by a major rating agency.
	Top Ten Reinsurers
	At December 31, 2013 and 2012, the top ten reinsurers of the Company’s business accounted for 68.3% and 63.1%, respectively, of total reinsurance balances recoverable (which includes loss reserves recoverable and recoverables on paid losses) and included $290.1 million and $194.5 million, respectively, of IBNR reserves recoverable. With the exception of one BBB+ rated reinsurer and one non-rated reinsurer from which $41.4 million and $256.2 million, respectively, was recoverable (December 31, 2012: $37.7 million and $nil, respectively), the other top ten reinsurers, as at December 31, 2013 and 2012, were all rated A- or better. Reinsurance balances recoverable by reinsurer were as follows:


		2013						2012
		Reinsurance			% of			Reinsurance		% of
		Recoverables			Total			Recoverables		Total
	Top 10 reinsurers	$	930,943			68.3	%	$	708,953		63.1	%
	Other reinsurers’ balances > $1 million		423,013			31	%		409,666		36.5	%
	Other reinsurers’ balances < $1 million		9,863			0.7	%		4,300		0.4	%

	Total	$	1,363,819			100	%	$	1,122,919		100	%

	As at December 31, 2013 and 2012, reinsurance balances recoverable with a carrying value of $256.2 million and $144.1 million, respectively, were associated with one reinsurer, which represented 10% or more of total reinsurance balances recoverable. Of the $256.2 million and $144.1 million recoverable from reinsurers at December 31, 2013 and 2012, $256.2 million and $121.7 million, respectively, were secured in a trust account held for the benefit of the Company’s insurance and reinsurance subsidiaries.

Losses_and_Loss_Adjustment_Exp

Losses and Loss Adjustment Expenses	12 Months Ended
Losses and Loss Adjustment Expenses	Dec. 31, 2013
Insurance [Abstract]	'
Losses and Loss Adjustment Expenses	'
	8. LOSSES AND LOSS ADJUSTMENT EXPENSES


			2013												2012
			Non-life				Active				Total				Non-life				Active			Total
			Run-off				Underwriting				Total				Run-off				Underwriting			Total
	Outstanding		$	2,541,934			$	79,826			$	2,621,760			$	2,358,329			$	—		$	2,358,329
	Incurred but not reported			1,717,870				98,583				1,816,453				1,588,310				—			1,588,310
	Fair value adjustment			(255,291	)			36,983				(218,308	)			(296,512	)			—			(296,512	)

			$	4,004,513			$	215,392			$	4,219,905			$	3,650,127			$	—		$	3,650,127

	The liability for losses and loss adjustment expenses includes an amount determined from reported claims and amount based on historical loss experience and industry statistics for losses incurred but not reported using a variety of actuarial methods. The Company’s loss reserves cover multiple lines of business, which include workers compensation, general casualty, asbestos and environmental, marine, aviation and transit, construction defects and other non-life lines of business.

	The reserves for unpaid reported losses and loss adjustment expenses for Atrium are established by management based on reports from brokers, ceding companies and insureds and represents the estimated ultimate cost of events or conditions that have been reported to, or specifically identified by the Company. The reserve for incurred but not reported losses and loss expenses is established by management based on actuarially determined estimates of ultimate losses and loss expenses. Inherent in the estimate of ultimate losses and loss expenses are expected trends in claim severity and frequency and other factors which may vary significantly as claims are settled. Accordingly, ultimate losses and loss expenses may differ materially from the amounts recorded in the consolidated financial statements. These estimates are reviewed regularly and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments, if any, will be recorded in earnings in the period in which they become known. Prior period development arises from changes to loss estimates recognized in the current year that relate to loss reserves established in previous calendar years.
	In establishing the reserves for losses and loss adjustment expenses related to asbestos and environmental claims, management considers facts currently known and the current state of the law and coverage litigation. Liabilities are recognized for known claims (including the cost of related litigation) when sufficient information has been developed to indicate the involvement of a specific insurance policy, and management can reasonably estimate its liability. In addition, reserves have been established to cover additional exposures on both known and unreported claims. Estimates of the reserves are reviewed and updated continually. Developed case law and adequate claim history do not exist for such claims, especially because significant uncertainty exists about the outcome of coverage litigation and whether past claim experience will be representative of future claim experience.
	In view of the changes in the legal and tort environment that affect the development of such claims, the uncertainties inherent in valuing asbestos and environmental claims are not likely to be resolved in the near future. Ultimate values for such claims cannot be estimated using traditional reserving techniques and there are significant uncertainties in estimating the amount of the Company’s potential losses for these claims.
	There can be no assurance that the reserves established by the Company will be adequate or will not be adversely affected by the development of other latent exposures. The Company’s liability for unpaid losses and loss adjustment expenses as of December 31, 2013 and 2012 included $467.7 million and $557.6 million, respectively, that represented an estimate of its net ultimate liability for asbestos and environmental claims. The gross liability for such claims as at December 31, 2013 and 2012 was $524.1 million and $628.7 million, respectively.

	The tables below provide a reconciliation of the beginning and ending reserves for losses and loss adjustment expenses for the years ended December 31, 2013, 2012 and 2011, split between the non-life run-off segment and the active underwriting segment, was as follows (losses incurred and paid are reflected net of reinsurance recoverables):
	Non-Life Run-off Segment


			Non-Life Run-off
			2013				2012				2011
	Balance as at January 1⁽¹⁾		$	3,650,127			$	4,272,082			$	3,291,275
	Less: total reinsurance reserves recoverable			876,220				1,383,003				525,440

				2,773,907				2,889,079				2,765,835
	Net increase (reduction) in ultimate losses and loss adjustment expense liabilities:
	Current period			74,139				—				—
	Prior periods			(257,114	)			(237,953	)			(293,461	)

	Total net reduction in ultimate losses and loss adjustment expense liabilities			(182,975	)			(237,953	)			(293,461	)

	Net losses paid:
	Current period			(10,656	)			—				—
	Prior periods			(360,214	)			(314,528	)			(288,175	)

	Total net losses paid			(370,870	)			(314,528	)			(288,175	)

	Effect of exchange rate movement			4,936				14,833				(7,987	)
	Acquired on purchase of subsidiaries			557,476				—				600,046
	Assumed business			100,506				422,476				112,821

	Net balance as at December 31			2,882,980				2,773,907				2,889,079
	Plus: total reinsurance reserves recoverable			1,121,533				876,220				1,383,003

	Balance as at December 31		$	4,004,513			$	3,650,127			$	4,272,082


	-1	The Company reclassified $11.0 million of reserves acquired on the purchase of subsidiaries previously recorded in 2011 to policy benefits for life and annuity contracts. In addition, the Company has reclassified outstanding losses and loss adjustment expenses of $11.0 million and $10.8 million to policy benefits for life and annuity contracts as at January 1, 2013 and 2012, respectively, to conform to the current period presentation. These amounts are associated with Laguna, which now forms part of the Company’s life and annuities segment that was established following the acquisition of the Pavonia companies.

	The net reduction (increase) in ultimate losses and loss adjustment expense liabilities for the years ended December 31, 2013, 2012 and 2011 was as follows:


			Non-Life Run-off
			Years Ended December 31,
			2013												2012				2011
			Prior				Current				Total				Prior				Prior
			Period				Period				Total				Period				Period
	Net losses paid		$	360,214			$	10,656			$	370,870			$	314,528			$	288,175
	Net change in case and LAE reserves			(310,488	)			29,555				(280,933	)			(265,222	)			(311,614	)
Net change in IBNR reserves			(265,206	)			33,928				(231,278	)			(267,422	)			(224,791	)

(Reduction) increase in estimates of net ultimate losses			(215,480	)			74,139				(141,341	)			(218,116	)			(248,230	)
Increase (reduction) in provisions for bad debt			1,999				—				1,999				(3,111	)			(42,822	)
Reduction in provisions for unallocated loss adjustment expense liabilities			(49,580	)			—				(49,580	)			(39,298	)			(45,102	)
Amortization of fair value adjustments			5,947				—				5,947				22,572				42,693

Net (reduction) increase in ultimate losses and loss adjustment expense liabilities		$	(257,114	)		$	74,139			$	(182,975	)		$	(237,953	)		$	(293,461	)


-1	For the years ended December 31, 2012 and 2011, the Company had no premium income and therefore no current period activity.
Net reduction (increase) in case and loss adjustment expense reserves (“LAE reserves”) comprises the movement during the year in specific case reserve liabilities as a result of claims settlements or changes advised to the Company by its policyholders and attorneys, less changes in case reserves recoverable advised by the Company to its reinsurers as a result of the settlement or movement of assumed claims. Net reduction in IBNR represents the change in the Company’s actuarial estimates of losses incurred but not reported.
Year Ended December 31, 2013
The net reduction in ultimate losses and loss adjustment expense liabilities for the year ended December 31, 2013 of $183.0 million included current period incurred losses of $74.1 million related to SeaBright. Excluding SeaBright’s current period incurred losses of $74.1 million, ultimate losses and loss adjustment expenses relating to prior periods were reduced by $257.1 million, which was attributable to a reduction in estimates of net ultimate losses of $215.5 million and a reduction in provisions for unallocated loss adjustment expense liabilities of $49.6 million, relating to 2013 run-off activity, partially offset by an increase in provisions for bad debt of $2.0 million and amortization of fair value adjustments over the estimated payout period relating to companies acquired amounting to $5.9 million.
The reduction in estimates of net ultimate losses relating to prior periods of $215.5 million comprised reductions in IBNR reserves of $265.2 million partially offset by net incurred loss development of $49.7 million. The decrease in the aggregate estimate of net IBNR reserves of $265.2 million (compared to $267.4 million during the year ended December 31, 2012), was comprised of $69.8 million relating to asbestos liabilities (compared to $36.4 million in 2012), $4.9 million relating to environmental liabilities (compared to $2.6 million in 2012), $42.6 million relating to general casualty liabilities (compared to $96.3 million in 2012), $42.1 million relating to workers compensation liabilities (compared to $52.7 million in 2012) and $105.8 million relating to all other remaining liabilities (compared to $79.4 million in 2012).

The aggregate reduction in net IBNR reserves of $265.2 million, relating to prior periods, was a result of the application, on a basis consistent with the assumptions applied in the prior period, of our actuarial methodologies to revised historical loss development data, following 108 commutations and policy buy-backs, to estimate loss reserves required to cover liabilities for unpaid losses and loss adjustment expenses relating to non-commuted exposures. The prior period estimate of aggregate net IBNR reserves was reduced as a result of the combined impact on all classes of business of loss development activity during 2013, including commutations and the favorable trend of loss development related to non-commuted policies compared to prior forecasts. The net incurred loss development resulting from settlement of net advised case and LAE reserves of $310.5 million for net paid losses of $360.2 million, related to the settlement of non-commuted losses in the year and 108 commutations and policy buy-backs of assumed and ceded exposures (including the commutation of one of our top ten assumed exposures and one of our top ten ceded recoverables as at January 1, 2013). Net advised case and LAE reserves settled by way of commutation and policy buy-back during the year ended December 31, 2013 amounted to $29.8 million (comprising $97.3 million of assumed case reserves and LAE reserves partially offset by $67.5 million of ceded incurred reinsurance recoverable case reserves).
The increase in aggregate provisions for bad debt of $2.0 million was a result of additional provisions being allowed in the quarter for contractual disputes with reinsurers, offset by cash collections and commutations on certain reinsurance receivables against which bad debt provisions had been provided in earlier periods.
Year Ended December 31, 2012
The net reduction in ultimate losses and loss adjustment expense liabilities for the year ended December 31, 2012 of $238.0 million was attributable to a reduction in estimates of net ultimate losses of $218.1 million, a reduction in aggregate provisions for bad debt of $3.1 million and a reduction in estimates of unallocated loss adjustment expense liabilities of $39.3 million, relating to 2012 run-off activity, partially offset by the amortization, over the estimated payout period, of fair value adjustments relating to companies acquired amounting to $22.6 million.
The reduction in estimates of net ultimate losses of $218.1 million comprised net incurred loss development of $49.3 million and reductions in net IBNR reserves of $267.4 million. During the three months ended December 31, 2012, one of the Company’s insurance entities, following an exposure-based review of all advised claims, allocated $52.4 million of net IBNR reserves to specific net case and LAE reserves. Excluding this allocation, net incurred loss development for the year ended December 31, 2012 was a favorable $3.1 million and reductions in net IBNR reserves amounted to $215.0 million. The decrease in the aggregate estimate of net IBNR reserves of $215.0 million, excluding the allocation of $52.4 million from net IBNR reserves to specific net case and LAE reserves (compared to $224.8 million during the year ended December 31, 2011), was comprised of $36.4 million relating to asbestos liabilities (compared to $57.9 million in 2011), $2.6 million relating to environmental liabilities (compared to $2.8 million in 2011), $96.3 million relating to general casualty liabilities (compared to $91.6 million in 2011), and $79.7 million relating to all other remaining liabilities (compared to $72.5 million in 2011).
The aggregate reduction in net IBNR reserves of $215.0 million was a result of the application, on a basis consistent with the assumptions applied in the prior period, of the Company’s actuarial methodologies to revised historical loss development data, following 101 commutations, to estimate loss reserves required to cover liabilities for unpaid losses and loss adjustment expenses relating to non-commuted exposures. The prior period estimate of aggregate net IBNR reserves was reduced as a result of the combined impact on all classes of business of loss development activity during 2012, including commutations and the favorable trend of loss development related to non-commuted policies compared to prior forecasts. The net incurred favorable loss development, excluding the allocation by one of the Company’s insurance entities of $52.4 million from net IBNR reserves to specific net case and LAE reserves, of $3.1 million, resulting from settlement of net advised case and LAE reserves of $317.6 million for net paid losses of $314.5 million, related to the settlement of non-commuted losses in the year and 101 commutations of assumed and ceded exposures. Net incurred liabilities settled by way of commutation during the year ended December 31, 2012 amounted to $26.6 million (comprising $163.1 million of assumed incurred liabilities partially offset by $136.5 million of ceded incurred reinsurance recoverables) compared to the net aggregate reduction in advised case reserves during the same period of $317.6 million (excluding the allocation of $52.4 million from net IBNR reserves to specific net case and LAE reserves).
The reduction in aggregate provisions for bad debt of $3.1 million was a result of the collection of certain reinsurance recoverables against which bad debt provisions had been provided in earlier periods.
Year Ended December 31, 2011
The net reduction in ultimate losses and loss adjustment expense liabilities for the year ended December 31, 2011 of $293.5 million was attributable to a reduction in estimates of net ultimate losses of $248.2 million, a reduction in aggregate provisions for bad debt of $42.8 million and a reduction in estimates of unallocated loss adjustment expense liabilities of $45.1 million, relating to 2011 run-off activity, partially offset by the amortization, over the estimated payout period, of fair value adjustments relating to companies acquired amounting to $42.7 million.
The reduction in estimates of net ultimate losses of $241.2 million comprised net incurred favorable loss development of $23.4 million and reductions in net IBNR reserves of $224.8 million. The decrease in the aggregate estimate of net IBNR reserves of $224.8 million was comprised of $57.9 million relating to asbestos liabilities, $2.8 million relating to environmental liabilities and $164.1 million relating to all other remaining liabilities. The aggregate reduction in net IBNR reserves of $224.8 million was a result of the application, on a basis consistent with the assumptions applied in the prior period, of the Company’s actuarial methodologies to revised historical loss development data, following 113 commutations (including three commutations completed shortly after December 31, 2011), to estimate loss reserves required to cover liabilities for unpaid losses and loss adjustment expenses relating to non-commuted exposures. The prior period estimate of aggregate net IBNR reserves was reduced as a result of the combined impact on all classes of business of loss development activity during 2011, including commutations and the favorable trend of loss development related to non-commuted policies compared to prior forecasts.
The net incurred favorable loss development of $23.4 million, resulting from settlement of net advised case and LAE reserves of $311.6 million for net paid losses of $288.2 million, related to the settlement of non-commuted losses in the year and approximately 110 commutations of assumed and ceded exposures, excluding the three commutations completed subsequent to December 31, 2011. Net incurred liabilities settled by way of commutation during the year ended December 31, 2011 (excluding the three commutations completed subsequent to December 31, 2011) amounted to $71.5 million compared to the net reduction in advised case reserves during the same period of $311.6 million.

The reduction in aggregate provisions for bad debt of $42.8 million was a result of the collection, primarily during the three months ended December 31, 2011, of certain reinsurance recoverables against which bad debt provisions had been provided in earlier periods.
Active Underwriting Segment


		2013
		Active
		Underwriting
Balance as of January 1		$	—
Less: total reinsurance reserves recoverable			—

			—
Acquired on purchase of subsidiaries			200,374
Net increase in ultimate losses and loss adjustment expenses incurred:
Current period			19,303
Net losses paid:
Current period			(30,626	)
Effect of exchange rate movement			1,286

Net balance as of December 31			190,337
Plus: total reinsurance reserves recoverable			25,055

Balance as at December 31		$	215,392

The net increase in ultimate losses and loss adjustment expense liabilities for the active underwriting segment for the year ended December 31, 2013 was as follows:


		Year Ended December 31, 2013
		Prior Period				Current Period				Total
Net losses paid		$	—			$	30,626			$	30,626
Net change in case and LAE reserves			—				(9,621	)			(9,621	)
Net change in IBNR reserves			—				(1,653	)			(1,653	)

Increase in estimates of net ultimate losses			—				19,352				19,352
Reduction in provisions for unallocated loss adjustment expense liabilities			—				(49	)			(49	)

Net increase in ultimate losses and loss adjustment expense liabilities		$	—			$	19,303			$	19,303

Policy_Benefits_for_Life_and_A

Policy Benefits for Life and Annuity Contracts	12 Months Ended
Policy Benefits for Life and Annuity Contracts	Dec. 31, 2013
Investments All Other Investments [Abstract]	'
Policy Benefits for Life and Annuity Contracts	'
	9. POLICY BENEFITS FOR LIFE AND ANNUITY CONTRACTS
	The Company has entered into long duration contracts that subject the Company to mortality, longevity and morbidity risks and which are accounted for as life and annuity premiums earned. Life and annuity benefit reserves are established using assumptions for investment yields, mortality, morbidity, lapse and expenses, including a provision for adverse deviation. The Company establishes and reviews its life and annuity reserves regularly based upon cash flow projections. The Company establishes and maintains its life and annuity reinsurance reserves at a level that the Company estimates will, when taken together with future premium payments and investment income expected to be earned on associated premiums, be sufficient to support all future cash flow benefit obligations and third party servicing obligations as they become payable. The assumptions used to determine policy benefit reserves are best estimate assumptions that are locked-in throughout the life of the contract unless a premium deficiency develops. The assumptions are reviewed no less than annually and are unlocked if they result in a material reserve change. The Company establishes these estimates based upon transaction specific historical experience, information provided by the ceding company and industry experience studies. Actual results could differ materially from these estimates. As the experience on the contracts emerges, the assumptions are reviewed by management. The Company determines whether actual and anticipated experience indicates that existing policy reserves, together with the present value of future gross premiums, are sufficient to cover the present value of future benefits, settlement and maintenance costs. If such a review produces reserves in excess of those currently held then the lock-in assumptions are revised and an additional life and annuity benefit reserve is recognized at that time.
	Policy benefits for life and annuity contracts as at December 31, 2013 and 2012 were as follows:


		2013			2012
	Life	$	380,874		$	11,027
	Annuities		963,323			—

			1,344,197			11,027
	Fair value adjustments		(71,097	)		—

		$	1,273,100		$	11,027

Premiums_Written_and_Earned

Premiums Written and Earned	12 Months Ended
Premiums Written and Earned	Dec. 31, 2013
Insurance [Abstract]	'
Premiums Written and Earned	'
	10. PREMIUMS WRITTEN AND EARNED
	The following tables provide a summary of net premiums written and earned in our non-life run-off, active underwriting and life and annuities segments for the years ended December 31, 2013, 2012 and 2011:


		2013						2012				2011
		Premiums			Premiums			Premiums		Premiums		Premiums		Premiums
		Written			Earned			Written		Earned		Written		Earned
	Non-life run-off
	Direct	$	17,250		$	121,986		$	—	$	—	$	—	$	—
	Assumed		(3,084	)		2,276			—		—		—		—
	Ceded		(4,933	)		(11,651	)		—		—		—		—

	Net	$	9,233		$	112,611		$	—	$	—	$	—	$	—

	Active underwriting
	Direct		10,214			12,416		$	—	$	—	$	—	$	—
	Assumed		19,890			19,796			—		—		—		—
	Ceded		—			—			—		—		—		—

	Net	$	30,104		$	32,212		$	—	$	—	$	—	$	—

	Life and annuities
	Life	$	63,856		$	94,984		$	3,511	$	3,511	$	3,543	$	3,543

	Non-life run-off
	Net premiums written and earned by SeaBright totaled $9.2 million and $112.6 million from the date of acquisition to December 31, 2013, respectively. Now that SeaBright’s exit from the mandatory renewal process has been approved, the Company expects that SeaBright will no longer generate premiums written other than for small adjustments related to premium audits and reinstatement premiums on previously written policies. As at December 31, 2013, SeaBright had total unearned premiums of $1.2 million.
	Active underwriting
	Net premiums written and earned by Atrium and Arden combined totaled $30.1 million and $32.2 million, respectively, from their dates of acquisition to December 31, 2013. As at December 31, 2013, Atrium and Arden had total unearned premiums of $59.5 million and $6.3 million, respectively.
	Life and annuities
	Life and annuity premiums written by the Company’s life and annuities segment totaled $63.9 million, $3.5 million and $3.5 million for the years ended December 31, 2013, 2012 and 2011, respectively, and net earned premiums, over the same periods, totaled $95.0 million, $3.5 million and $3.5 million, respectively. The Company’s life companies continue to collect premiums in relation to the unexpired policies assumed on acquisition. As at December 31, 2013, Pavonia had total unearned premiums of $3.7 million.
	For the year ended December 31, 2013, the Company’s life and annuities segment consisted of both Pavonia and Laguna, while for the years ended December 31, 2012 and 2011, it consisted of Laguna only.

Retrospectively_Rated_Contract

Retrospectively Rated Contracts	12 Months Ended
Retrospectively Rated Contracts	Dec. 31, 2013
Insurance [Abstract]	'
Retrospectively Rated Contracts	'
	11. RETROSPECTIVELY RATED CONTRACTS
	On October 1, 2003, SeaBright began selling workers’ compensation insurance policies for which the premiums varied based on loss experience. Accrued retrospective premiums are determined based upon the loss experience of business subject to such experience rating adjustment, and are determined by and allocated to individual policyholder accounts. Accrued retrospective premiums are recorded as additions to written or earned premium, and return retrospective premiums are recorded as reductions from written or earned premium. During the period from February 7, 2013, the date of acquisition, to December 31, 2013, none of the Company’s direct premiums written related to retrospectively rated contracts. The Company has recorded $8.8 million for retrospective premiums receivable and $27.5 million for return retrospective premiums payable as at December 31, 2013.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	12. GOODWILL AND INTANGIBLE ASSETS
	The following tables show the Company’s goodwill and intangible assets as at December 31, 2013 and 2012:


	2013		Goodwill				Intangible assets with				Intangible assets with				Total			Intangible assets with
	2013		Goodwill				a definite life-Other				an indefinite life				Total			a definite life-FVA
	Balance as at January 1, 2013		$	21,222			$	—			$	—			$	21,222		$	211,507
	Acquired during the year			38,848				27,000				63,000				128,848			33,623
	Intangible assets amortization			—				—				—				—			(21,183	)

	Balance as at December 31, 2013		$	60,070			$	27,000			$	63,000			$	150,070		$	223,947

	2012		Goodwill				Intangible				Intangible				Total			Intangible assets
							assets				assets							with a
							with a				with an							definite life-FVA
							definite				indefinite
							life-Other				life
	Balance as at January 1, 2012		$	21,222			$	—			$	—			$	21,222		$	243,904
	Acquired during the year			—				—				—				—			(9,825	)
	Intangible assets amortization			—				—				—				—			(22,572	)

	Balance as at December 31, 2012		$	21,222			$	—			$	—			$	21,222		$	211,507

	Intangible assets with a definite life include:

		(i)	Fair value adjustments (“FVA”) relate to outstanding losses and loss adjustment expenses, policy benefits for life and annuity contracts and reinsurance recoverables and are included as a component of each balance sheet line item. FVA are amortized in proportion to future premiums for policy benefits for life and annuity contracts and over the estimated payout or recovery period for outstanding losses and loss adjustment expenses and reinsurance recoverables; and

		(ii)	Other intangible assets relate to the values associated with the distribution channel and brand related to the Company’s acquisition of Atrium. These assets will be amortized on a straight-line basis a over a period of ten to fifteen years.
	Intangible asset amortization during the years ended December 31, 2013, 2012 and 2011 totaled $21.2 million, $22.6 million and $42.7 million, respectively
	The gross carrying value, accumulated amortization and net carrying value of intangible assets by type at December 31, 2013 and 2012 were as follows:


			2013												2012
			Gross Carrying				Accumulated				Net Carrying				Gross Carrying			Accumulated			Net Carrying
			Value				Amortization				Value				Value			Amortization			Value
	Intangible assets with a definite life:
	Fair value adjustments:
	Losses and loss adjustment expense		$	500,485			$	(282,178	)		$	218,307			$	552,455		$	(255,943	)	$	296,512
	Reinsurance balances recoverable			(179,116	)			113,659				(65,457	)			(178,377	)		93,372			(85,005	)
	Policy benefits for life and annuity contracts			86,332				(15,235	)			71,097				—			—			—

	Total			407,701				(183,754	)			223,947				374,078			(162,571	)		211,507
	Other::
	Distribution channel			20,000				—				20,000				—			—			—
	Brand			7,000				—				7,000				—			—			—

	Total			27,000				—				27,000				—			—			—

	Total intangible assets with a definite life			434,701				(183,754	)			250,947				374,078			(162,571	)		211,507
	Intangible assets with an indefinite life:
	Lloyd’s syndicate capacity			32,900				—				32,900				—			—			—
	Management contract			30,100				—				30,100				—			—			—

	Total intangible assets		$	497,701			$	(183,754	)		$	313,947			$	374,078		$	(162,571	)	$	211,507


	At December 31, 2013 the allocation of the goodwill to the Company’s non-life run-off and active underwriting segments was $21.2 million and $38.8 million, respectively, as compared to $21.2 million and $nil as at December 31, 2012.
	The estimated amortization expense for each of the five succeeding fiscal years related to the Company’s intangible assets with a definite life for each segment is as follows:


	Year		Non-life				Active				Life and				Total
	Year		Run-off				Underwriting				Annuities				Total
	2014		$	23,485			$	(5,693	)		$	9,271			$	27,063
2015			19,246				(5,626	)			8,249				21,869
2016			16,376				(3,384	)			7,373				20,365
2017			14,569				(1,779	)			6,862				19,652
2018			12,940				(573	)			6,132				18,499

Total		$	86,616			$	(17,055	)		$	37,887			$	107,448

Loans_Payable

Loans Payable

12 Months Ended

Dec. 31, 2013

Text Block [Abstract]

Loans Payable

13. LOANS PAYABLE

The Company’s loans payable consist of loan facilities used to partially finance certain of the Company’s acquisitions or significant new business transactions and its Revolving Credit Facility (the “EGL Revolving Credit Facility”), which can be used for permitted acquisitions and general corporate purposes. The Company’s credit facilities related to the Company’s 2011 acquisition of Clarendon National Insurance Company (the “Clarendon Facility”) and its term facility related to the 2013 acquisition of SeaBright (the “SeaBright Facility”). Until they were fully repaid on December 3, 2012, the Company also had loans outstanding related to share repurchase agreements with three of its executives and certain trusts and a corporation affiliated with the executives.

For the years ended December 31, 2013, 2012 and 2011, the Company incurred interest expense of $12.4 million, $8.4 million and $8.5 million, respectively, on its loan facilities and loans related to the share repurchase agreements. All of the Company’s currently outstanding loan facilities are floating rate loans, and the fair values of these loans approximate their book values.

Amounts of loans payable outstanding, and accrued interest, as of December 31, 2013 and 2012 total $452.4 million and $107.4 million, respectively, and comprise:

Facility

Date of Facility

Facility

December 31,

Term

2013

2012

EGL Revolving Credit Facility

July 8, 2013

5 Years

258,800

—

SeaBright Facility

December 21, 2012

3 Years

111,000

—

Clarendon Facility

12-Jul-11

4 Years

78,995

106,500

448,795

106,500

Accrued interest

3,651

930

Total loans payable

452,446

107,430

Amendment and Restatement of EGL Revolving Credit Facility

On July 8, 2013, the Company, and certain of its subsidiaries, as borrowers, as well as certain of its subsidiaries, as guarantors, entered into an amendment and restatement of its existing Revolving Credit Facility Agreement with National Australia Bank Limited (“NAB”) and Barclays Bank PLC (“Barclays”), as mandated lead arrangers, NAB, Barclays and Royal Bank of Canada, as original lenders, and NAB as agent (the “Restated Credit Agreement”). The Restated Credit Agreement provides for a five-year EGL Revolving Credit Facility (expiring in July 2018) pursuant to which the Company is permitted to borrow up to an aggregate of $375.0 million, which is available to fund permitted acquisitions and for general corporate purposes. The previously existing Revolving Credit Facility Agreement had provided for a three-year $250.0 million facility that was set to terminate in June 2014. The Company’s ability to draw on the EGL Revolving Credit Facility is subject to customary conditions.

The EGL Revolving Credit Facility is secured by a first priority lien on the stock of certain of the Company’s subsidiaries and certain bank accounts held with Barclays in the name of the Company and into which amounts received in respect of any capital release from certain of the Company’s subsidiaries are required to be paid. Interest is payable at the end of each interest period chosen by the Company or, at the latest, each six months. The interest rate is LIBOR plus 2.75%, plus an incremental amount tied to certain regulatory costs, if any, that may be incurred by the lenders. Any unused portion of the EGL Revolving Credit Facility will be subject to a commitment fee of 1.10%. The EGL Revolving Credit Facility imposes various financial and business covenants on the Company, the guarantors and certain other material subsidiaries, including limitations on mergers and consolidations, acquisitions, indebtedness and guarantees, restrictions as to dispositions of stock and assets, restrictions on dividends and limitations on liens. As of December 31, 2013 all of the financial covenants relating to the EGL Revolving Credit Facility were met.

During the existence of any event of default (as specified in the Restated Credit Agreement), the agent may cancel the commitments of the lenders, declare all or a portion of outstanding amounts immediately due and payable, declare all or a portion of outstanding amounts payable upon demand or proceed against the security. During the existence of any payment default, the interest rate would be increased by 1.0%. The EGL Revolving Credit Facility terminates and all amounts borrowed must be repaid on the fifth anniversary of the date of the Restated Credit Agreement.

During 2013, the Company borrowed $258.8 million under the EGL Revolving Credit Facility to fund certain acquisitions and for general corporate purposes. The interest rate on these borrowings was approximately 2.9%, subject to periodic adjustment in accordance with the terms of the EGL Revolving Credit Facility.

Clarendon Facility

On March 4, 2011, the Company, through Clarendon Holdings, Inc., entered into a $106.5 million term facility agreement (the “Clarendon Facility”) with NAB. The Clarendon Facility provides a four-year term loan facility, which was fully drawn upon on July 12, 2011 to fund 50% of the purchase price of Clarendon.

The Clarendon Facility is secured by a security interest in all of the assets of Clarendon Holdings, Inc., as well as a first priority lien on the stock of both Clarendon Holdings, Inc. and Clarendon. Interest is payable at the end of each interest period chosen by Clarendon Holdings, Inc. or, at the latest, each six months. The interest rate is LIBOR plus 2.75%. The Clarendon Facility is subject to various financial and business covenants, including limitations on mergers and consolidations, restrictions as to disposition of stock and limitations on liens on the stock. As of December 31, 2013, all of the financial covenants relating to the Clarendon Facility were met.

During the existence of any payment default, the interest rate is increased by 1.0%. During the existence of any event of default (as specified in the term facility agreement), the lenders may declare all or a portion of outstanding amounts immediately due and payable, declare all or a portion of borrowed amounts payable upon demand, or proceed against the security. The Clarendon Facility terminates and all amounts borrowed must be repaid on July 12, 2015.

On July 31, 2013, the Company repaid $27.5 million of the outstanding principal on its Clarendon Facility reducing the outstanding principal as of December 31, 2013 to $79.0 million.

SeaBright Facility

On December 21, 2012, the Company, through AML Acquisition, Corp. (“AML Acquisition”), entered into a Term Facility Agreement with NAB and Barclays (the “SeaBright Facility”). The SeaBright Facility provides a four-year term loan facility, which AML Acquisition fully drew down on February 5, 2013 in an amount of $111.0 million to partially fund the Company’s acquisition of SeaBright Holdings, Inc. (“SeaBright”). The Company acquired SeaBright on February 7, 2013 by way of a merger of AML Acquisition with and into SeaBright (the “Merger”), with SeaBright surviving the Merger as an indirect, wholly-owned subsidiary of the Company.

Following completion of the Merger, SeaBright (as the survivor of the Merger) became the borrower under the SeaBright Facility and the facility became secured by a security interest in all of the assets of SeaBright, a pledge of the stock of SeaBright by its sole stockholder, a pledge of the stock of SeaBright Insurance Company, Paladin Managed Care Services, Inc., and PointSure Insurance Services, Inc. (which are wholly-owned subsidiaries of SeaBright) by SeaBright, and a security interest in all of the assets of Paladin Managed Care Services, Inc. and PointSure Insurance Services, Inc.

From the date of the SeaBright Facility until the draw down on February 5, 2013, the undrawn and uncancelled amount of the SeaBright Facility incurred a fee of 1% per annum. Interest on amounts borrowed under the SeaBright Facility is payable at the end of each interest period chosen by the borrower or, at the latest, each six months. The interest rate is LIBOR plus 2.75% for the first 18 months from February 5, 2013 and increases to LIBOR plus 3.50% thereafter; the interest rate is subject to increase by an incremental amount tied to certain regulatory costs, if any, that may be incurred by the lenders. The SeaBright Facility imposes various financial and business covenants on SeaBright, including limitations on mergers and consolidations, acquisitions, indebtedness and guarantees, restrictions as to dispositions of stock and assets (except for certain permitted dispositions), restrictions on dividends, and limitations on liens. As at December 31, 2013, all of the financial covenants relating to the SeaBright Facility were met.

During the existence of any payment default, the interest rate would be increased by 1.0%. During the existence of any event of default (as specified in the SeaBright Facility), the lenders may cancel their commitments, declare all or a portion of outstanding amounts immediately due and payable, declare all or a portion of borrowed amounts payable upon demand, or proceed against the security. The SeaBright Facility terminates and all amounts borrowed must be repaid on December 21, 2016, the fourth anniversary of the date the facility was put in place.

SeaBright Surplus Notes

On August 26, 2013, the Company fully repaid the outstanding principal and accrued interest of $12.1 million associated with the subordinated floating rate surplus notes issued by SeaBright in a private placement in May 2004. Interest expense for the period from February 7, 2013 (the date of acquisition of SeaBright) to December 31, 2013 was $0.3 million.

Redeemable_Noncontrolling_Inte

Redeemable Noncontrolling Interest	12 Months Ended
	Dec. 31, 2013
Noncontrolling Interest [Abstract]	'
Redeemable Noncontrolling Interest	'
	14. REDEEMABLE NONCONTROLLING INTEREST
	The redeemable noncontrolling interest comprises the 40% ownership interest in Northshore held by Trident. Northshore owns 100% of Atrium and Arden. The redeemable noncontrolling interest is classified outside of permanent shareholders’ equity on the Company’s consolidated balance sheets due to the redemption rights held by Trident, which are described in Note 3 — Acquisitions. The Company recognizes changes in the redemption value of the Trident interest in Northshore’s earnings as if the balance sheet date was also the redemption date. As at December 31, 2013, there were no adjustments recorded through retained earnings as the redemption value of the Trident interest approximated its carrying value.
	A reconciliation of the beginning and ending carrying amount of the equity attributable to the redeemable noncontrolling interest is as follows:


		Redeemable
		noncontrolling
		interest
	Balance as at December 31, 2012	$	—
	Redeemable noncontrolling interest, initial contributions		96,689
	Net earnings attributable to redeemable noncontrolling interest		4,170

	Balance as at December 31, 2013	$	100,859

Share_Capital

Share Capital	12 Months Ended
Share Capital	Dec. 31, 2013
Equity [Abstract]	'
Share Capital	'
	15. SHARE CAPITAL
	As at December 31, 2013 and 2012, the authorized share capital was 111,000,000 ordinary shares (“Voting Ordinary Shares”) and non-voting convertible ordinary shares (“Non-Voting Ordinary Shares”), each par value $1.00 per share and 45,000,000 preference shares of par value $1.00 per share. Each Voting Ordinary Share entitles the holder thereof to one vote. In accordance with the Company’s bye-laws, however, any U.S. shareholder or direct foreign shareholder group whose shares constitute 9.5% or more of the voting power of our Voting Ordinary Shares would be entitled to less than one vote for each Voting Ordinary Share held by them.
	Issued and fully paid Voting Ordinary Shares of par value $1.00 each:


			2013		2012
	Balance, beginning of year		$	13,752	$	13,665
	Issue of shares			6		43
	Share awards granted/vested			45		44

	Balance, end of year		$	13,803	$	13,752

	Issued and fully paid Series A non-voting convertible ordinary shares of par value $1.00 each:


			2013		2012
	Balance, beginning and end of year		$	2,973	$	2,973

	Issued and fully paid Series C non-voting convertible ordinary shares of par value $1.00 each:


			2013		2012
	Balance, beginning and end of year		$	2,726	$	2,726

	Series B, C and D Non-Voting Ordinary Shares
	In connection with the transactions consummated pursuant to the April 20, 2011 Investment Agreement (the “Investment Agreement”) between the Company and GSCP VI AIV Navi, Ltd., GSCP VI Offshore Navi, Ltd., GSCP VI Parallel AIV Navi, Ltd., GSCP VI Employee Navi, Ltd., and GSCP VI GmbH Navi, L.P. (collectively, the “Purchasers”), each of which is an affiliate of Goldman, Sachs & Co., the Company has authorized Non-Voting Ordinary Shares in three different series: Series B, C and D. Only Series C Non-Voting Ordinary Shares are issued and outstanding. There is no economic difference in the sub-series of Non-Voting Ordinary Shares, but there are slight differences in the limited voting rights of each sub-series that are designed to address certain regulatory matters that may affect the Purchasers.
	In accordance with the Investment Agreement, the Company issued and sold to the Purchasers, at three different closings that occurred during 2011, securities for an aggregate purchase price of $291.6 million. As a result of all three closings, the Purchasers received: (i) 665,529 Voting Ordinary Shares, (ii) 2,725,637 Series C Non-Voting Ordinary Shares, and (iii) warrants providing the right to acquire 340,820 Non-Voting Ordinary Shares for an exercise price of $115.0 per share, subject to certain adjustments, that expire on April 20, 2021.
	The Purchasers may elect to convert their Voting Ordinary Shares into Series B Non-Voting Ordinary Shares, Series C Non-Voting Ordinary Shares or Series D Non-Voting Ordinary Shares. Holders of the Series C Non-Voting Ordinary Shares have the right to convert such shares, on a share-for-share basis, subject to certain adjustments, into Series D Non-Voting Ordinary Shares at their option. Holders of the Series B Non-Voting Ordinary Shares would have the right to convert such shares on a share-for-share basis, subject to certain adjustments, into Voting Ordinary Shares, Series C Non-Voting Ordinary Shares or Series D Non-Voting Ordinary Shares at their option.
	Series B Convertible Participating Non-Voting Perpetual Preferred Stock
	In connection with the agreement to acquire Torus, on July 8, 2013, the Company’s Board of Directors’ created 4,000,000 shares of Series B Convertible Participating Non-Voting Perpetual Preferred Stock, par value $1.00 per share (the “Non-Voting Preferred Shares”), from the authorized and unissued preference shares. The Company will issue a combination of Voting Ordinary Shares and Non-Voting Preferred Shares to certain shareholders of Torus at closing of the Amalgamation, as described in Note 3 — Acquisitions.
	The Non-Voting Preferred Shares:

		•		rank on parity with the Voting Ordinary Shares and Non-Voting Ordinary Shares, but would rank senior to any other class or series of share capital of the Company, unless the terms of any such class or series shall provide otherwise;

		•		would receive dividends when, and if, and in the same amounts (on an as-converted basis), dividends are declared on the Voting Ordinary Shares and/or Non-Voting Ordinary Shares;

		•		automatically convert on a one-to-one basis into: (i) Voting Ordinary Shares upon the transfer of such Non-Voting Preferred Shares to any person other than an affiliate of First Reserve if that transfer qualifies as a widely dispersed offering and (ii) a new series of Non-Voting Ordinary Shares of the Company upon the approval by the Company’s shareholders of an amendment to the Company’s bye-laws to authorize such series;

		•		have a liquidation preference of $0.001 per share, and thereafter are entitled to participate (on an as-converted basis) with the Voting Ordinary Shares and the Non-Voting Ordinary Shares in the distribution of remaining assets; and

		•		have no voting rights other than: (i) in the event of a proposed change to the Company’s organizational documents that would significantly and adversely affect the rights of the Non-Voting Preferred Shares, (ii) certain share exchanges or reclassifications of the Non-Voting Preferred Shares, (iii) certain mergers or consolidations of the Company, or (iv) a voluntary liquidation or dissolution of the Company.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
Earnings Per Share	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	16. EARNINGS PER SHARE
	The following table sets forth the comparison of basic and diluted earnings per share for the years ended December 31, 2013, 2012 and 2011:


		2013		2012		2011
	Basic earnings per ordinary share:
	Net earnings attributable to Enstar Group Limited	$	208,604	$	168,017	$	153,693
	Weighted average ordinary shares outstanding — basic		16,523,369		16,441,461		13,930,221

	Net earnings per ordinary share attributable to Enstar Group Limited — basic	$	12.62	$	10.22	$	11.03

	Diluted earnings per ordinary share:
	Net earnings attributable to Enstar Group Limited	$	208,604	$	168,017	$	153,693
	Weighted average ordinary shares outstanding — basic		16,523,369		16,441,461		13,930,221
	Share equivalents:
	Unvested shares		117,850		162,454		196,670
	Restricted share units		18,056		19,478		69,723
	Warrants		44,167		—		—
	Options		—		14,628		15,826

	Weighted average ordinary shares outstanding — diluted		16,703,442		16,638,021		14,212,440

	Net earnings per ordinary share attributable to Enstar Group Limited — diluted	$	12.49	$	10.1	$	10.81

Employee_Benefits

Employee Benefits	12 Months Ended
Employee Benefits	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Employee Benefits	'
	17. EMPLOYEE BENEFITS
	Summary
	Components of salaries and benefits are summarized as follows:


		2013			2012		2011
	Salaries and benefits	$	83,563		$	63,689	$	55,642
	Defined contribution pension plan expense		6,023			4,240		4,864
	2006 equity plan		2,923			2,894		2,662
	Annual incentive plan		32,107			29,650		26,678

	Total salaries and benefits	$	124,616		$	100,473	$	89,846


	Employee share plans
	Employee share awards are summarized as follows:


		2013					2012					2011
		Number of			Weighted		Number of			Weighted		Number of			Weighted
		Shares			Average		Shares			Average		Shares			Average
					Fair					Fair					Fair
					Value of					Value of					Value of
					the Award					the Award					the Award
	Nonvested — January 1		160,644		$	17,989		203,930		$	20,026		153,930		$	13,019
	Granted		4,959			557		5,633			472		71,621			5,957
	Vested		(50,444	)		5,855		(48,919	)		4,736		(21,621	)		1,907

	Nonvested — December 31		115,159		$	15,997		160,644		$	17,989		203,930		$	20,026

	2006 Equity Incentive Plan / 2011-2015 Annual Incentive Compensation Program
	For the years ended December 31, 2013, 2012 and 2011, nil, 191 and 16,328 shares, respectively, were awarded to employees under the 2006 Equity Incentive Plan (the “Equity Plan”).
	The total unrecognized compensation cost related to the Company’s non-vested share awards under the Equity Plan as at December 31, 2013 and 2012 was $4.7 million and $7.6 million, respectively. This cost is expected to be recognized evenly over the next 1.8 years. Compensation costs of $2.9 million, $2.8 million and $2.7 million relating to these share awards were recognized in the Company’s statement of earnings for the years ended December 31, 2013, 2012 and 2011, respectively.
	The total value of the awards for the years ended December 31, 2013 and 2012 were $nil and $1.5 million with the value of the 2012 award being charged against the Enstar Group Limited 2011-2015 Annual Incentive Compensation Program (the “Incentive Program”) accrual established for the year ended December 31, 2011.
	The accrued expense relating to the Incentive Program for the years ended December 31, 2013 and 2012 was $32.1 million and $29.6 million, respectively, as compared to $26.7 million for the year ended December 31, 2011 relating to the Enstar Group Limited 2006-2010 Annual Incentive Compensation Program (“2006 Program”). The 2006 Program ended effective December 31, 2010. On February 23, 2011, the Company adopted the Incentive Program.
	Enstar Group Limited Employee Share Purchase Plan
	For the years ended December 31, 2013, 2012 and 2011, compensation costs of less than $0.1 million relating to the shares issued under the Amended and Restated Enstar Group Limited Employee Share Purchase Plan (the “Share Plan”) were recognized in the Company’s statement of earnings. As at December 31, 2013, 2012 and 2011, 4,959, 5,442 and 5,208 shares have been issued to employees under the Share Plan.
	Deferred Compensation and Ordinary Share Plan for Non-Employee Directors
	For the years ended December 31, 2013, 2012 and 2011, 3,566 3,029 and 4,193 restricted share units, respectively, were credited to the accounts of non-employee directors under the Enstar Group Limited Deferred Compensation and Ordinary Share Plan for Non-Employee Directors. The Company recorded expenses related to the restricted share units for the years ended December 31, 2013, 2012 and 2011 of $0.5 million, $0.3 million and $0.4 million, respectively.

	Pension Plan
	The Company provides pension benefits to eligible employees through various plans sponsored by the Company. All pension plans, except for the noncontributory defined benefit pension plan acquired in the 2010 PW Acquisition Company transaction (the “PWAC Plan”), are structured as defined contribution plans. Pension expense for the years ended December 31, 2013, 2012 and 2011 was $6.0 million, $4.5 million and $4.9 million, respectively.
	In addition, the Company recorded pension expense relating to the PWAC Plan for the years ended December 31, 2013, 2012 and 2011 of $0.7 million, $0.8 million and $0.6 million, respectively. During 2013, an actuarial review was performed on the PWAC plan, which determined that the PWAC Plan’s unfunded liability, as at December 31, 2013, was $7.8 million as compared to $13.9 million as at December 31, 2012. As at December 31, 2013, PW Acquisition Company had an accrued liability of $7.8 million for the unfunded PWAC Plan liability.

Taxation

Taxation	12 Months Ended
Taxation	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Taxation	'
	18. TAXATION
	Earnings before income taxes includes the following components:


			2013				2012				2011
	Domestic (Bermuda)		$	193,063			$	30,839			$	44,983
	Foreign			66,378				204,970				188,759

	Total		$	259,441			$	235,809			$	233,742

	Tax expense (benefit) for income taxes is comprised of:


			2013				2012				2011
	Current:
	Domestic (Bermuda)		$	—			$	—			$	—
	Foreign			30,787				34,704				28,924

				30,787				34,704				28,924

	Deferred:
	Domestic (Bermuda)			—				—				—
	Foreign			4,832				9,586				(3,640	)

				4,832				9,586				(3,640	)

	Total tax expense		$	35,619			$	44,290			$	25,284

	Under current Bermuda law, the Company and its Bermuda subsidiaries are exempted from paying any taxes in Bermuda on their income or capital gains until March 2035.
	The Company has operating subsidiaries and branch operations in the United Kingdom, Australia, the United States and Europe and is subject to federal, foreign, state and local taxes in those jurisdictions. In addition, certain distributions from some foreign sources may be subject to withholding taxes.
	The expected income tax provision for the foreign operations computed on pre-tax income at the weighted-average tax rate has been calculated as the sum of the pre-tax income in each jurisdiction multiplied by that jurisdiction’s applicable statutory tax rate.

	The actual income tax rate differed from the amount computed by applying the effective rate of 0% under Bermuda law to earnings before income taxes as shown in the following reconciliation:


			2013				2012				2011
	Earnings before income tax		$	259,441			$	235,809			$	233,742

	Expected tax rate			—	%			—	%			—	%
	Foreign taxes at local expected rates			5.1	%			20.8	%			19.2	%
	Change in uncertain tax positions			(1.0	)%			0.1	%			—	%
	Change in valuation allowance			7.2	%			(3.0	)%			(8.4	)%
	Impact of Australian tax consolidation			—	%			—	%			0.8	%
	Other			2.4	%			0.9	%			(0.8	)%

	Effective tax rate			13.7	%			18.8	%			10.8	%

	Deferred income taxes arise from the recognition of temporary differences between income determined for financial reporting purposes and income tax purposes. The temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented in the table below:


			As of December 31,
			2013				2012
	Deferred tax assets
	Benefit of losses, deductions, and other carryforwards		$	187,377			$	162,389
	Claims reserves, principally due to discounting for tax			217,283				27,195
	Allowance for doubtful accounts receivable			22,303				16,703
	Investments			—				7,552

				426,963				213,839

	Deferred tax liabilities
	Investments			(31,932	)			(11,999	)
	Unrecognized income			(21,740	)			—
Intangible asset from acquisition			(18,000	)			—
Other			(5,424	)			—

Net deferred tax asset before valuation allowance			349,867				201,840
Valuation allowance			(366,650	)			(202,365	)

Net deferred tax liability		$	(16,783	)		$	(525	)

As of December 31, 2013 and 2012, U.K. insurance subsidiaries and branch operations had tax loss carryforwards, which do not expire, and deductions available for tax purposes of approximately $357.4 million and $346.9 million, respectively. Certain of the Company’s U.K. insurance and reinsurance subsidiaries have tax loss carryforwards that arose prior to acquisition. Under U.K. tax law, these tax loss carryforwards are available to offset future taxable income generated by the acquired company without time limit.
As of December 31, 2013 and 2012, U.S. subsidiaries had deductible losses for tax purposes of approximately $315.0 million and $234.5 million, respectively. Under U.S. tax law, these tax losses can be carried forward and could be available to offset future taxable income of the companies that experienced the losses.

The Company has estimated future taxable income of its foreign subsidiaries and has provided a valuation allowance in respect of those loss carryforwards where it does not expect to realize a benefit. The Company has considered all available evidence using a “more likely than not” standard in determining the amount of the valuation allowance.
The Company had unrecognized tax benefits of $2.2 million, $5.8 million and $5.6 million relating to uncertain tax positions as of December 31, 2013, 2012 and 2011, respectively.
During the years ended December 31, 2013, 2012 and 2011, there were certain reductions to unrecognized tax benefits due to the expiration of statutes of limitations of $0.3 million, $nil and $0.1 million, respectively, which were included in net earnings.
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


		2013				2012				2011
Balance, beginning of year		$	5,821			$	5,621			$	5,566
Gross increases — tax positions related to prior years			114				221				161
Gross decreases — tax positions related to prior years			(3,346	)			(12	)			—
Lapse of statute of limitations			(340	)			(9	)			(106	)

Balance, end of year		$	2,249			$	5,821			$	5,621

Included in the balances at December 31, 2013, 2012 and 2011 were $1.5 million, $4.4 million and $4.4 million, respectively, of tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. Because of the impact of deferred tax accounting, other than interest and penalties, the disallowance of the shorter deductibility period would not affect the annual effective tax rate but would accelerate the payment of cash to the taxing authority to an earlier period.
It is reasonably possible that the amount of unrecognized tax benefits with respect to certain of the unrecognized tax positions could decrease by up to approximately $2.0 million within the next 12 months if the statute of limitations expires on certain tax periods.
The Company recognizes accrued interest and penalties related to unrecognized tax benefits as a part of income tax expense. During the years ended December 31, 2013, 2012 and 2011, the Company recognized a benefit for the reversal of interest and penalties related to unrecognized tax benefits due to the expiration of the statute of limitations in the amount of $0.2 million, $nil and $0.1 million, respectively. The Company had approximately $0.7 million, $1.5 million and $1.2 million accrued for the payment of interest and penalties related to unrecognized tax benefits at December 31, 2013, 2012 and 2011, respectively.
The Company’s operating subsidiaries in specific countries may be subject to audit by various tax authorities and may have different statutes of limitations expiration dates. With limited exceptions, the Company’s major subsidiaries that operate in the United States, United Kingdom and Australia are no longer subject to tax examinations for years before 2007, 2010 and 2007, respectively.
Because the Company operates in many jurisdictions, its net earnings are subject to risk due to changing tax laws and tax rates around the world. The current, rapidly changing economic environment may increase the likelihood of substantial changes to tax laws in the jurisdictions in which it operates. The Company cannot predict what, if any, legislation will actually be proposed or enacted, or what the effect of any such legislation might be on the Company’s financial condition and results of operations.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	19. RELATED PARTY TRANSACTIONS
	Stone Point Capital LLC
	Following several private transactions occurring from May 2012 to July 2012, Trident acquired approximately 9.7% of the Company’s voting ordinary shares. On November 6, 2013, the Company appointed James D. Carey to its Board of Directors. Mr. Carey is the sole member of an entity that is one of four general partners of the entities serving as general partners for the Trident funds, is a member of the investment committees of such general partners, and is a member and senior principal of Stone Point Capital LLC, the manager of the Trident funds. In addition, the Company entered into certain agreements with Trident with respect to Trident’s co-investments in the Atrium and Arden acquisitions and the pending Torus acquisition. Refer to Note 3 — “Acquisitions” for a description of these co-investment transactions. Mr. Carey serves as a Trident representative on the board of the holding company established in connection with the Atrium/Arden co-investment transaction and is expected to serve as a representative on the Torus board and on the board of the holding company established in connection with the Torus co-investment transaction following the closing of the Amalgamation.
	The Company has investments in two funds (carried within other investments) affiliated with entities owned by Trident. As of December 31, 2013, the fair value of the investments in the two funds was $87.7 million. The Company has also invested in a fund managed by Sound Point Capital, an entity in which Mr. Carey has an approximately 4% indirect ownership interest and serves as director. As of December 31, 2013, the fair value of this investment was $21.6 million. The Company has recognized $1.2 million in net realized and unrealized gains in respect of this investment as of December 31, 2013.
	Subsequent to December 31, 2013, the Company made a commitment to invest up to $20.0 million in the Trident Parallel VI Fund, a fund managed by Stone Point Capital LLC.
	Goldman Sachs & Co.
	As of December 31, 2013, affiliates of Goldman Sachs & Co. (“Goldman Sachs”) own approximately 4.8% of the Company’s voting ordinary shares and 100% of the Company’s non-voting convertible ordinary shares. Sumit Rajpal, a managing director of Goldman Sachs, was appointed to the Board of Directors in connection with Goldman Sachs’ investment in the Company. As of December 31, 2013, the Company had an investment in one fund (carried within other investments) affiliated with entities owned by Goldman Sachs, which had a fair value of $3.2 million. Subsequent to December 31, 2013, the Company invested £12.5 million in indirect non-voting interests of two companies affiliated with Hastings Insurance Group Limited. The Company’s interests are held in accounts managed by affiliates of Goldman Sachs. Goldman Sachs affiliates have an approximately 50% interest in the Hastings companies, and Mr. Rajpal serves as a director of the entities the Company has invested in.
	Affiliates of Goldman Sachs own approximately 22% of Global Atlantic Financial Group (“GAFG”), which owns entities that provide reinsurance to Arden. As at December 31, 2013, the Company’s total reinsurance recoverable from GAFG entities amounted to $340.8 million. As at December 31, 2013, reinsurance balances recoverable from a particular non-rated GAFG entity with a carrying value of $256.1 million represented 10% or more of the Company’s total non-life run-off reinsurance balances recoverable. The $256.1 million recoverable from that GAFG entity at December 31, 2013 was secured by a trust account. The balance of $84.7 million as at December 31, 2013 was recoverable from GAFG entities rated A- and higher.

Retained_Earnings_and_Statutor

Retained Earnings and Statutory Restrictions	12 Months Ended
Retained Earnings and Statutory Restrictions	Dec. 31, 2013
Text Block [Abstract]	'
Retained Earnings and Statutory Restrictions	'
	20. RETAINED EARNINGS AND STATUTORY RESTRICTIONS
	Restrictions on the Payment of Dividends
	The Company’s ability to pay dividends to its shareholders is dependent upon the ability of its insurance and reinsurance subsidiaries to distribute capital and pay dividends to it. The Company’s insurance and reinsurance subsidiaries are subject to certain regulatory restrictions on the distribution of capital and payment of dividends in the jurisdictions in which they operate as more fully described below. The restrictions are generally based on net income or levels of capital and surplus as determined in accordance with the relevant statutory accounting practices. Failure of these subsidiaries to meet their applicable regulatory requirements could result in restrictions on any distributions of capital or retained earnings and/or stricter regulatory oversight of the subsidiaries. In addition, the Company’s ability to pay dividends and make other forms of distributions is further limited by repayment obligations in the Company’s outstanding loan facility agreements.
	As at December 31, 2013, the amount of consolidated retained earnings of the Company that was free of restrictions and therefore potentially available to be distributed to the Company’s ordinary shareholders was $1,177.5 million (2012: $972.9 million). This amount is held primarily within our insurance and reinsurance subsidiaries and represents retained earnings held in those companies in excess of their minimum regulatory requirements. Although these amounts are in excess of statutory minimums, regulators may nonetheless further restrict distributions, and therefore actual amounts available for distribution to shareholders are likely to be significantly less. In addition, the Company does not intend to pay dividends on its ordinary shares, as it intends instead to reinvest any distributions from its subsidiaries back into the Company, primarily as a means to fund future acquisitions.
	Statutory Restrictions
	The Company’s insurance and reinsurance subsidiaries prepare their statutory financial statements in conformity with statutory accounting practices prescribed or permitted by the applicable local regulatory authority. The statutory financial statements may vary materially from statements prepared in accordance with U.S. GAAP.
	The statutory capital and surplus amounts for the years ended December 31, 2013 and 2012 and statutory net income (loss) amounts for the years ended December 31, 2013, 2012 and 2011 for the Company’s insurance and reinsurance subsidiaries based in Bermuda, the United Kingdom, Australia, the United States and Europe were as follows:


		Statutory Capital and Surplus
		Minimum Required				Actual				Statutory Income (Loss)
		2013		2012		2013		2012		2013		2012			2011
	Bermuda	$	109,010	$	92,606	$	833,263	$	627,335	$	103,852	$	98,247		$	80,022
	U.K.	$	83,410	$	80,324	$	592,992	$	506,459	$	76,685	$	64,015		$	114,403
	Australia	$	65,894	$	82,007	$	99,174	$	94,042	$	19,131	$	4,651		$	13,979
	U.S.	$	138,331	$	102,114	$	879,947	$	445,818	$	4,725	$	(42,109	)	$	(8,234	)
	Europe	$	12,965	$	38,642	$	142,216	$	173,974	$	11,035	$	7,578		$	22,356
	The Company’s insurance and reinsurance subsidiaries are subject to insurance laws and regulations in the jurisdictions in which they operate, including Bermuda, the United Kingdom, Australia, the United States and Europe. Certain material aspects of these laws and regulations as they relate to solvency, dividends and capital and surplus are summarized below.

	Bermuda — Non-life Run-off / Active Underwriting
	The Company’s Bermuda-based insurance and reinsurance subsidiaries are registered under the Insurance Act 1978 of Bermuda and related regulations, as amended (the “Insurance Act”). The Insurance Act requires that the Company’s Bermuda-based insurance and reinsurance subsidiaries maintain certain solvency and liquidity standards. The minimum liquidity ratio requires that the value of relevant assets must not be less than 75% of the amount of relevant liabilities. The minimum solvency margin, which varies depending on the class of the insurer, is determined as a percentage of either net reserves for losses and loss expenses or premiums or pursuant to a risk-based capital measure.
	Each of the Company’s regulated Bermuda insurance and reinsurance subsidiaries would be prohibited from declaring or paying any dividends if it were in breach of its minimum solvency margin (which is a function of outstanding losses) or liquidity ratio (which is a function of relevant assets) or if the declaration or payment of such dividends would cause it to fail to meet such margin or ratio. In addition, each of the Company’s regulated Bermuda insurance and reinsurance subsidiaries is prohibited, without the prior approval of the Bermuda regulator, from reducing by 15% or more its total statutory capital as set out in its previous year’s statutory financial statements. In addition, the Company’s Bermuda insurance companies that are in run-off are required to seek regulatory approval for any dividends or distributions.
	As of December 31, 2013 and 2012, each of the Company’s Bermuda-based insurance and reinsurance subsidiaries exceeded their respective minimum solvency and liquidity requirements. The Bermuda insurance and reinsurance subsidiaries in aggregate exceeded minimum solvency requirements by $724.3 million as of December 31, 2013 (2012: $534.7 million) and exceeded minimum liquidity requirements by $459.1 million as of December 31, 2013 (2012: $369.4 million).
	United Kingdom — Non-life Run-off
	The Company’s U.K. based insurance subsidiaries are regulated by the U.K. Prudential Regulatory Authority (the “PRA”) and the Financial Conduct Authority (the “FCA”), which together replaced the Financial Services Authority effective April 1, 2013 (the PRA and FCA collectively, the “U.K. Regulator”).
	The Company’s U.K.-based insurance subsidiaries are required to maintain adequate financial resources in accordance with the requirements of the U.K. Regulator. The calculation of the minimum capital resources requirements in any particular case depends on, among other things, the type and amount of insurance business written and claims paid by the insurance company. As at December 31, 2013 and 2012, all of the Company’s U.K. insurance subsidiaries maintained capital in excess of the minimum capital resources requirements (or received a waiver from the U.K. Regulator from the requirement to remedy any shortfall) and complied with the relevant U.K. Regulator requirements. The U.K.-based insurance subsidiaries, in aggregate, maintained capital in excess of the minimum capital resources requirements by $509.6 million and $426.1 million as of December 31, 2013 and 2012, respectively.
	In addition, the U.K. Regulator’s Individual Capital Adequacy Standards framework (“ICAS framework”), requires insurance companies to carry out various capital modeling and risk management exercises in order to calculate a company-specific Individual Capital Assessment amount (“ICA amount”), which is the company’s internal calculation of its capital requirements under the ICAS framework. This is intended to ensure a company holds sufficient capital such that there is no material risk that its liabilities cannot be met as they fall due. In 2009, the European Parliament approved the Solvency II framework directive. Solvency II is expected to take effect in January 2016. Solvency II will set out new, strengthened EU-wide requirements on capital adequacy and risk management for insurers with the aim of increasing policyholder protection, instilling greater risk awareness and improving the international competitiveness of EU insurers.

	The U.K. Regulator’s rules require the Company’s U.K. insurance subsidiaries to obtain regulatory approval for any proposed or actual payment of a dividend. The U.K. Regulator uses the ICA and the estimated capital requirement for Solvency II purposes when assessing requests to make distributions and therefore dividends approved by the U.K. Regulator will often significantly differ from any surplus capital above the entity’s minimum capital resources requirements.
	Lloyd’s — Non-life Run-off / Active Underwriting
	As of December 31, 2013, the Company participated in the Lloyd’s market through its interests in: (i) Atrium Underwriting Group, which manages S609 and provides approximately one quarter of the syndicate’s capital; and (ii) Shelbourne, which consists of an approved Lloyd’s managing agent, a corporate member and S2008, a wholly aligned syndicate that has permission to underwrite RITC and other legacy or discontinued business type transactions with other Lloyd’s syndicates. The Lloyd’s market is currently in the Solvency II internal model application process under Lloyd’s supervision. The Company’s Lloyd’s operations will therefore be required to meet Solvency II standards when they come into effect.
	The underwriting capacity of a member of Lloyd’s must be supported by providing a deposit (referred to as “Funds at Lloyd’s”) in the form of cash, securities or letters of credit in an amount determined under the ICA. The amount of the Funds at Lloyd’s is assessed annually and is determined by Lloyd’s in accordance with the capital adequacy rules established by the U.K. Regulator. In order to achieve finality and to release their capital, Lloyd’s members are usually required to have transferred their liabilities through an approved RITC, such as offered by S2008. RITC is generally put in place after the third year of operations of a syndicate year of account. On successful conclusion of RITC, any profit from the syndicate’s operations for that year of account can be remitted by the managing agent to the syndicate’s members.
	The Company’s total capital commitment to S2008 and S609 was £133.0 million (approximately $220.2 million). The capital commitment was financed from available cash on hand of $146.2 million and a letter of credit of $74.0 million.
	Australia — Non-life Run-off
	The Company’s Australian insurance subsidiary is regulated and subject to prudential supervision by the Australian Prudential Regulation Authority (“APRA”). APRA is the primary regulatory body responsible for regulating compliance with the Insurance Act 1973. APRA’s prudential standards require that all insurers maintain and meet prescribed capital adequacy requirements to enable their insurance obligations to be met under a wide range of circumstances. As of January 1, 2013, APRA introduced capital reforms that have modified how Australian insurers meet their capital requirements and have introduced additional regulatory obligations with respect to capital oversight and capital reporting, which apply to our subsidiary. The new capital requirements were brought in to enhance and strengthen capital adequacy in the market and increase the level of internal oversight and review for insurers. The Company’s Australian insurance subsidiary meets the new capital requirements.
	An insurer must obtain APRA’s written consent prior to making any capital releases, including any payment of dividends. The Company’s insurance subsidiary must provide APRA a valuation prepared by an appointed actuary that demonstrates that the tangible assets of the insurer, after the proposed capital reduction, are sufficient to cover its insurance liabilities to a 99.5% level of sufficiency of capital before APRA will consent to a capital release or dividend. As of December 31, 2013 and 2012, the Company’s Australian-based insurance subsidiary exceeded the required 99.5% level of sufficiency by $33.3 million and $12.0 million, respectively.

	United States — Non-life Run-off
	The Company’s U.S. non-life run-off insurance and reinsurance subsidiaries are subject to the insurance laws and regulations of the states in which they are domiciled, licensed and/or approved to conduct business. These laws restrict the amount of dividends the subsidiaries can pay to the Company. The restrictions are generally based on statutory net income and/or certain levels of statutory surplus as determined in accordance with the relevant statutory accounting requirements of the individual domiciliary states or states in which any of the insurance or reinsurance subsidiaries are domiciled. Generally, prior regulatory approval must be obtained before an insurer may pay a dividend or make a distribution above a specified level.
	The U.S. subsidiaries are required to file annual statements with insurance regulatory authorities prepared on a statutory basis prescribed or permitted by such authorities. Statutory accounting principles differ from U.S. GAAP in the treatment of various items, including treatment of deferred acquisition costs, deferred income taxes, required investment reserves, reserve calculation assumptions and surplus notes. For all of the Company’s U.S. insurance and reinsurance subsidiaries, with the exception of one subsidiary, there are no prescribed or permitted statutory accounting practices that differ significantly from the statutory accounting principles established by the National Association of Insurance Commissioners (“NAIC”). In 2013, one of the Company’s U.S. insurance and reinsurance subsidiaries increased reserves for adjusting and other expenses in its statutory financial statements. As at December 31, 2012, these reserves of approximately $47.0 million had been recorded at its immediate parent company level. This had no impact on the consolidated financial statements for the Company. The same U.S. insurance and reinsurance subsidiary also has a permitted accounting practice to treat an adverse development cover reinsurance agreement as prospective reinsurance. The U.S. insurance and reinsurance subsidiaries are also required to maintain minimum levels of solvency and liquidity as determined by law, and to comply with risk-based capital requirements and licensing rules.
	As of December 31, 2013 and 2012, all of the Company’s U.S. non-life run-off insurance and reinsurance subsidiaries exceeded their required levels of risk-based capital, with the exception of one subsidiary that was acquired while under supervision. On an aggregate basis, the U.S.-based non-life run-off insurance and reinsurance subsidiaries (excluding the subsidiary under supervision) exceeded their minimum levels of risk-based capital as of December 31, 2013 and 2012 by $642.7 million and $354.3 million, respectively; the subsidiary under regulatory supervision was below its minimum required risk-based capital level by approximately $5.6 million as of December 31, 2013 (2012: $10.6 million). As a consequence of being under regulatory supervision, the subsidiary’s regulator must approve any and all disbursements, new contracts or agreements. The Company does not believe this subsidiary’s non-compliance presents material risk to the Company’s operations or financial condition.
	United States/Canada — Life and Annuities
	The Company’s life and annuities subsidiaries file financial statements with state insurance regulatory authorities and the NAIC in the United States and the Office of Superintendent of Financial Institutions (“OSFI”) in Canada (as a result of one of the Company’s subsidiaries having a Canadian branch operation). Such statements are prepared in accordance with Statutory Accounting Principles (“SAP”) prescribed or permitted by such authorities which may vary materially from GAAP. SAP includes the Accounting Practices and Procedures Manual of the NAIC as well as other laws, regulations and administrative rules promulgated by the state insurance departments. SAP encompasses all accounting practices not so prescribed. The principal differences between statutory financial statements and financial statements prepared in accordance with GAAP are that statutory financial statements do not reflect deferred acquisition costs, some bond portfolios may be carried at amortized cost, assets and liabilities are presented net of reinsurance, contract holder liabilities are generally valued using more conservative assumptions and certain assets are non-admitted. Accordingly, statutory
	operating results and statutory capital and surplus may differ substantially from amounts reported in the GAAP basis financial statements for comparable items.
	The Company’s life and annuity companies are subject to certain Risk-Based Capital (“RBC”) requirements as specified by the NAIC and OSFI. RBC is used to evaluate the adequacy of capital and surplus maintained by the Company’s life and annuities companies in relation to risks associated with: (i) asset risk; (ii) insurance risk; (iii) interest rate risk and (iv) business risk.
	As of December 31, 2013, the Company’s life and annuities subsidiaries exceeded their minimum RBC requirements by $104.5 million. These subsidiaries are restricted by state laws and regulations as to the amount of dividends they may pay to their parent without regulatory approval in any year, the purpose of which is to protect affected insurance policyholders, depositors or investors. Any dividends in excess of limits are deemed “extraordinary” and require approval. As of December 31, 2013, the maximum dividend payout which may be made without prior approval is $nil.
	Europe — Non-life Run-off
	The Company’s Swiss insurance subsidiary is regulated by the Swiss Financial Market Supervisory Authority (“FINMA”) pursuant to the Insurance Supervisory Act 2004. This subsidiary is obligated to maintain a minimum solvency margin based on the Solvency I and Swiss Solvency Test regulations (“SST”) as stipulated by the Insurance Supervisory Act. As of December 31, 2013 and 2012, this subsidiary exceeded the Solvency I requirements by $118.1 million (2012: $103.9 million) and exceeded the SST requirements by $67.4 million (2012: $44.9 million). The amount of dividends that this subsidiary is permitted to distribute is restricted to freely distributable reserves, which consist of retained earnings, the current year profit and legal reserves. Any dividend exceeding the current year profit requires FINMA’s approval. The solvency and capital requirements must continue to be met following any distribution. During 2013, the Company exited Belgium, Denmark and Sweden.
	Europe — Life and Annuities
	One of the Company’s life insurance subsidiaries files its audited financial statements with the Companies Registration Office in Ireland. The financial statements are prepared in accordance with the provisions of the Companies Act, 1963 to 2013, and the European Communities (Insurance Undertakings: Accounts) Regulations, 1996.
	The financial statements of this subsidiary are prepared in accordance with applicable accounting standards under the historical cost convention, as modified by the revaluation of investments, and comply with financial reporting standards of the Accounting Standards Board, as promulgated by the Institute of Chartered Accountants in Ireland.
	In addition, this subsidiary files audited regulatory returns with the Central Bank of Ireland. The returns are prepared in accordance with the European Communities (Life Assurance) Framework Regulations, 1994. The Company has exceeded the minimum required solvency margin as at December 31, 2013 and 2012 by $11.0 million and $11.7 million, respectively. The subsidiary cannot make any distributions with the prior approval of the Central Bank of Ireland, any such payments must be paid within six months of the most recent actuarial investigation, the purpose of which is ensure that the subsidiary’s insurance policyholders are not negatively affected.
	Restricted net assets of consolidated subsidiaries
	As at December 31, 2013, the total amount of net assets of the Company’s consolidated subsidiaries that were restricted was $732.5 million (2012: $617.2 million).

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	21. COMMITMENTS AND CONTINGENCIES
	Concentration of Credit Risk
	The Company’s portfolio of cash and fixed maturities is managed pursuant to guidelines that follow what it believes are prudent standards of diversification. The guidelines limit the allowable holdings of a single issue and issuers, and as a result the Company does not believe that there are any significant concentrations of credit risk associated with its portfolio of cash and fixed maturities.
	The Company’s portfolio of other investments is managed pursuant to guidelines that emphasize diversification and liquidity. Pursuant to these guidelines, the Company manages and monitors risk across a variety of investment funds and vehicles, markets and counterparties. The Company believes that there are no significant concentrations of credit risk associated with its other investments.
	The Company’s investments are held by 36 different custodians. These custodians are all large financial institutions that are highly regulated. These institutions have controls over their investment processes that are certified annually. The largest concentration of fixed maturities investments, by fair value, at a single custodian was $2.8 billion and $1.8 billion as of December 31, 2013 and 2012, respectively.
	Leases
	The Company leases office space under operating leases expiring in various years through 2018. The leases are renewable at the option of the lessee under certain circumstances. The following is a schedule of future minimum rental payments on non-cancellable leases as of December 31, 2013:


	2013	$	5,912
	2014		4,781
	2015		2,759
	2016		585
	2017		406
	2018		309

		$	14,752

	Rent expense for the years ended December 31, 2013, 2012 and 2011 was $5.5 million, $3.9 million and $3.0 million, respectively.
	Investments
	The following table provides a summary of the Company’s outstanding unfunded investment commitments for the years ended December 31, 2013 and 2012:


	December 31, 2013				December 31, 2012
	Original	Commitments			Original	Commitments
	Commitments	Funded		Unfunded	Commitments	Funded	Unfunded
	$291,000	$176,760		$114,240	$251,000	$163,409	$87,591
	Guarantees
	As at December 31, 2013 and 2012, the Company had, in total, parental guarantees supporting a subsidiary’s insurance obligations in the amount of $228.5 million and $213.3 million, respectively.

	Acquisitions
	The Company has entered into definitive agreements with respect to: (i) the Reciprocal of America loss portfolio transfer, which management expects to close in the second quarter of 2014; and (ii) the Amalgamation of Veranda and Torus Insurance Holdings Limited, which is expected to close in the first quarter of 2014. The Torus acquisition agreement is described in Note 3 — “Acquisitions,” and the Reciprocal of America agreement is described in Note 4 — “Significant New Business.”
	In connection with the acquisition of Torus, the Company has entered into an Investors Agreement with Trident and will enter into a Shareholders’ Agreement with Trident at the closing of the Torus Amalgamation. The Company’s obligations and rights relating to the Investors and Shareholders’ Agreements are described in Note 3 — “Acquisitions.”
	Pursuant to the Amalgamation Agreement to acquire Torus, the Company has agreed that at the closing of the Amalgamation, it will issue 2,612,346 shares (which will consist of a combination of Voting Ordinary Shares and Non-Voting Preferred Shares) and pay cash of approximately $69.2 million to fund its share of the purchase price, as described in Note 3 — “Acquisitions.” At closing, the Company will also enter into a Shareholder Rights Agreement with First Reserve and a Registration Rights Agreement with First Reserve and Corsair; the obligations and rights under these agreements are also described in Note 3.
	Legal Proceedings
	The Company is, from time to time, involved in various legal proceedings in the ordinary course of business, including litigation regarding claims. The Company does not believe that the resolution of any currently pending legal proceedings, either individually or taken as a whole, will have a material effect on its business, results of operations or financial condition. The Company anticipates that, similar to the rest of the insurance and reinsurance industry, it will continue to be subject to litigation and arbitration proceedings in the ordinary course of business, including litigation generally related to the scope of coverage with respect to asbestos and environmental claims.

Segment_Information

Segment Information	12 Months Ended
Segment Information	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	22. SEGMENT INFORMATION
	Due to the Company’s acquisition of the Pavonia companies on March 31, 2013 and the acquisitions of Arden and Atrium on September 9, 2013 and November 25, 2013, respectively, the Company reevaluated its segment reporting and began measuring the results of its operations in three segments: (i) non-life run-off; (ii) life and annuities and (iii) active underwriting.
	The Company’s non-life run-off segment comprises the operations and financial results of those subsidiaries acquired for the purpose of running off their property and casualty business.
	The Company’s life and annuities segment comprises the operations and financial results of those subsidiaries, primarily the Pavonia companies, operating in the closed-block of life and annuity business. Certain new significant accounting policies applicable to the life and annuities segment were adopted during the year and are described in Note 1 — “Significant New Accounting Policies.”
	The Company’s active underwriting segment comprises the operations and financial results of Atrium and its subsidiaries and Arden. Results related to Arden’s reinsurance to Atrium are included within the Company’s active underwriting segment, while results related to Arden’s discontinued business are included within the Company’s non-life run-off segment. Once the Company completes the acquisition, the active underwriting segment will also include substantially all of the activities of Torus Insurance Holdings Limited and its
	subsidiaries (some of Torus’ lines of business are in run-off and will accordingly be accounted for within the Company’s non-life run-off segment).
	Invested assets are managed on a subsidiary by subsidiary basis, and investment income and realized and unrealized gains on investments are recognized in each segment as earned.
	The elimination items includes the elimination of intersegment revenues and expenses.
	The Company’s total assets by segment were:


			December 31, 2013				December 31, 2012
	Total assets — non-life run-off		$	6,619,992			$	5,825,402
	Total assets — life and annuities			1,414,987				52,859
	Total assets — active underwriting			585,176				—

			$	8,620,155			$	5,878,261


	The following tables set forth selected and consolidated statement of earnings results by segment for the years ended December 31, 2013, 2012, 2011:


			December 31, 2013
			Non-life				Life and				Active				Eliminations			Consolidated
			run-off				annuities				underwriting				Eliminations			Consolidated
	Net premiums earned		$	112,611			$	94,984			$	32,212			$	—		$	239,807
	Fees and commission income			12,785				—				2,708				(2,676	)		12,817
	Net investment income			64,048				30,182				521				(1,456	)		93,295
	Net realized and unrealized gains (losses)			79,368				(9,259	)			542				—			70,651

				268,812				115,907				35,983				(4,132	)		416,570

	EXPENSES
	Net reduction in ultimate losses and loss adjustment expense liabilities:
	Losses incurred on current period premiums			74,139				—				—				—			74,139
	earned — non-life run-off			74,139				—				—				—			74,139
	Losses incurred — active underwriting			—				—				19,352				—			19,352
	Reduction in estimates of net ultimate losses			(215,480	)			—				—				—			(215,480	)
	Increase in provisions for bad debt			1,999				—				—				—			1,999
	Reduction in provisions for unallocated loss adjustment expense liabilities			(49,580	)			—				(49	)			—			(49,629	)
	Amortization of fair value adjustments			5,947				—				—				—			5,947

				(182,975	)			—				19,303				—			(163,672	)
	Life and annuity policy benefits			—				78,354				—				—			78,354
	Acquisition costs			14,379				8,820				—				—			23,199
	Salaries and benefits			117,141				4,799				2,676				—			124,616
	General and administrative expenses			67,979				16,039				5,270				(2,676	)		86,612
	Interest expense			12,057				1,456				332				(1,456	)		12,389
	Net foreign exchange (gains) losses			(5,909	)			158				1,382				—			(4,369	)

				22,672				109,626				28,963				(4,132	)		157,129

	EARNINGS BEFORE INCOME TAXES			246,140				6,281				7,020				—			259,441
	INCOME TAXES			(34,191	)			(1,243	)			(185	)			—			(35,619	)

	NET EARNINGS			211,949				5,038				6,835				—			223,822
	Less: Net earnings attributable to noncontrolling interest			(12,076	)			—				(3,142	)			—			(15,218	)

	NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	199,873			$	5,038			$	3,693			$	—		$	208,604



			December 31, 2012
		Non-life				Life and				Eliminations				Consolidated
		run-off				annuities				Eliminations				Consolidated
Net premiums earned		$	—			$	3,511			$	—			$	3,511
Fees and commission income			9,283				—				(713	)			8,570
Net investment income			76,813				947				—				77,760
Net realized and unrealized gains			71,730				1,882				—				73,612

			157,826				6,340				(713	)			163,453

EXPENSES
Net reduction in ultimate losses and loss adjustment expense liabilities:
Reduction in estimates of net ultimate losses			(218,116	)			—				—				(218,116	)
Reduction in provisions for bad debt			(3,111	)			—				—				(3,111	)
Reduction in provisions for unallocated loss adjustment expense liabilities			(39,298	)			—				—				(39,298	)
Amortization of fair value adjustments			22,572				—				—				22,572

			(237,953	)			—				—				(237,953	)
Life and annuity policy benefits			—				(300	)			—				(300	)
Salaries and benefits			99,342				1,131				—				100,473
General and administrative expenses			55,731				1,574				(713	)			56,592
Interest expense			8,426				—				—				8,426
Net foreign exchange losses (gains)			644				(238	)			—				406

			(73,810	)			2,167				(713	)			(72,356	)

EARNINGS BEFORE INCOME TAXES			231,636				4,173				—				235,809
INCOME TAXES			(44,266	)			(24	)			—				(44,290	)

NET EARNINGS			187,370				4,149				—				191,519
Less: Net earnings attributable to noncontrolling interest			(23,502	)			—				—				(23,502	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	163,868			$	4,149			$	—			$	168,017



		December 31, 2011
		Non-life				Life and				Consolidated
		run-off				annuities				Consolidated
Net premiums earned		$	—			$	3,543			$	3,543
Fees and commission income			17,858				—				17,858
Net investment income			66,556				2,120				68,676
Net realized and unrealized gains			8,553				661				9,214
Gain on bargain purchase			—				13,105				13,105

			92,967				19,429				112,396

EXPENSES
Net reduction in ultimate losses and loss adjustment expense liabilities:
Reduction in estimates of net ultimate losses			(248,230	)			—				(248,230	)
Reduction in provisions for bad debt			(42,822	)			—				(42,822	)
Reduction in provisions for unallocated loss adjustment expense liabilities			(45,102	)			—				(45,102	)
Amortization of fair value adjustments			42,693				—				42,693

			(293,461	)			—				(293,461	)
Life and annuity policy benefits			—				1,557				1,557
Salaries and benefits			89,440				406				89,846
General and administrative expenses			70,841				969				71,810
Interest expense			8,529				—				8,529
Net foreign exchange losses (gains)			1,190				(817	)			373

			(123,461	)			2,115				(121,346	)

EARNINGS BEFORE INCOME TAXES			216,428				17,314				233,742
INCOME TAXES			(25,311	)			27				(25,284	)

NET EARNINGS			191,117				17,341				208,458
Less: Net earnings attributable to noncontrolling interest			(54,765	)			—				(54,765	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	136,352			$	17,341			$	153,693

Condensed_Unaudited_Quarterly_

Condensed Unaudited Quarterly Financial Data	12 Months Ended
Condensed Unaudited Quarterly Financial Data	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Condensed Unaudited Quarterly Financial Data	'
	23. CONDENSED	UNAUDITED QUARTERLY FINANCIAL DATA


			2013 Quarters Ended
			December 31				September 30				June 30				March 31
	Net premiums earned — non-life run-off		$	12,341			$	28,134			$	41,216			$	30,920
	Net premiums earned — life and annuities			29,323				30,540				34,380				741
	Net premiums earned — active underwriting			32,212				—				—				—
	Fees and commission income			5,012				2,398				2,960				2,447
	Net investment income			23,071				25,009				27,252				17,963
	Net realized and unrealized gains (losses)			31,440				37,010				(27,919	)			30,120

				133,399				123,091				77,889				82,191

	Net (reduction) increase in ultimate losses and loss adjustment expense liabilities:
	Losses incurred on current period premiums earned —non-life run-off			(14,153	)			24,236				35,523				28,533
	Losses incurred — active underwriting			19,352				—				—				—
	Reduction in estimates of net ultimate losses			(134,068	)			(27,850	)			(48,500	)			(5,062	)
	Increase (reduction) in provisions for bad debt			7,464				(5,465	)			—				—
	Reduction in provisions for unallocated loss and loss adjustment expense liabilities			(111	)			(16,320	)			(16,795	)			(16,403	)
	Amortization of fair value adjustments			(3,540	)			5,025				2,369				2,093

				(125,056	)			(20,374	)			(27,403	)			9,161
	Life and annuity policy benefits			20,970				31,081				25,562				741
	Acquisition costs			5,050				6,149				9,613				2,387
	Salaries and benefits			45,603				29,716				25,687				23,610
	General and administrative expenses			19,538				29,126				20,002				17,946
	Interest expense			3,593				3,270				3,091				2,435
	Net foreign exchange (gains) losses			(375	)			(673	)			(8,403	)			5,082

				(22,677	)			78,295				48,149				61,362

	EARNINGS BEFORE INCOME TAXES			164,076				44,796				29,740				20,829
	INCOME TAXES			(21,893	)			(1,340	)			(4,542	)			(7,844	)

	NET EARNINGS			142,183				43,456				25,198				12,985
	Less: Netearnings attributable to noncontrolling interest			(4,722	)			(3,469	)			(6,001	)			(1,026	)

	NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	137,461			$	39,987			$	19,197			$	11,959

	EARNINGS PER SHARE — BASIC:
	Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.32			$	2.42			$	1.16			$	0.72

	EARNINGS PER SHARE — DILUTED:
	Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.23			$	2.39			$	1.15			$	0.72



			2012 Quarters Ended
			December 31				September 30				June 30				March 31
	Net premiums earned — life and annuities		$	819			$	822			$	896			$	974
	Fees and commission income			2,657				1,944				1,775				2,194
	Net investment income			16,765				19,658				20,894				20,443
	Net realized and unrealized gains			18,259				28,280				1,691				25,382

				38,500				50,704				25,256				48,993

	Net reduction in ultimate losses and loss adjustment expense liabilities:
	Reduction in estimates of net ultimate losses			(97,895	)			(58,506	)			(58,417	)			(3,298	)
	Reduction in provisions for bad debt			(329	)			—				(527	)			(2,255	)
	Reduction in provisions for unallocated loss adjustment expense liabilities			(2,206	)			(12,579	)			(11,661	)			(12,852	)
	Amortization of fair value adjustments			4,207				8,538				2,240				7,587

			(96,223	)			(62,547	)			(68,365	)			(10,818	)
Life and annuity policy benefits			(2,992	)			822				896				974
Salaries and benefits			30,505				25,138				24,379				20,451
General and administrative expenses			13,169				14,409				14,156				14,858
Interest expense			2,540				1,713				2,062				2,111
Net foreign exchange (gains) losses			(2,212	)			977				(627	)			2,268

			(55,213	)			(19,488	)			(27,499	)			29,844

EARNINGS BEFORE INCOME TAXES			93,713				70,192				52,755				19,149
INCOME TAXES			(13,943	)			(14,700	)			(11,905	)			(3,742	)

NET EARNINGS			79,770				55,492				40,850				15,407
Less: Netearnings attributable to noncontrolling interest			(9,864	)			(7,776	)			(129	)			(5,733	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	69,906			$	47,716			$	40,721			$	9,674

EARNINGS PER SHARE — BASIC:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	4.25			$	2.9			$	2.48			$	0.59

EARNINGS PER SHARE — DILUTED:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	4.22			$	2.86			$	2.44			$	0.58



		2011 Quarters Ended
		December 31				September 30				June 30				March 31
Net premiums earned — life and annuities		$	1,080			$	1,192			$	1,271			$	—
Fees and commission income			10,154				1,623				2,045				4,036
Net investment income			15,571				18,498				19,059				15,548
Net realized and unrealized gains (losses)			2,231				(8,512	)			9,133				6,362
Gain on bargain purchase			—				—				—				13,105

			29,036				12,801				31,508				39,051

Net reduction in ultimate losses and loss adjustment expense liabilities:
Reduction in estimates of net ultimate losses			(173,924	)			(43,615	)			(28,079	)			(2,612	)
Reduction in provisions for bad debt			(38,751	)			(2,399	)			(1,672	)			—
Reduction in provisions for unallocated loss adjustment expense liabilities			(7,669	)			(14,113	)			(11,783	)			(11,537	)
Amortization of fair value adjustments			16,782				8,865				6,969				10,077

			(203,562	)			(51,262	)			(34,565	)			(4,072	)
Life and annuity policy benefits			(2,304	)			2,340				1,521				—
Salaries and benefits			41,818				20,923				16,723				10,382
General and administrative expenses			5,090				20,759				28,211				17,750
Interest expense			2,431				2,435				1,697				1,966
Net foreign exchange (gains) losses			(15	)			(8,878	)			1,932				7,334

			(156,542	)			(13,683	)			15,519				33,360

EARNINGS BEFORE INCOME TAXES			185,578				26,484				15,989				5,691
INCOME TAXES			(19,256	)			(4,436	)			(975	)			(617	)

NET EARNINGS			166,322				22,048				15,014				5,074
Less: Netearnings attributable to noncontrolling interest			(37,571	)			(9,984	)			(5,639	)			(1,571	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	128,751			$	12,064			$	9,375			$	3,503

EARNINGS PER SHARE — BASIC:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.89			$	0.85			$	0.67			$	0.27

EARNINGS PER SHARE — DILUTED:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.71			$	0.83			$	0.66			$	0.26

Schedule_I_Summary_of_Investme

Schedule I - Summary of Investments Other Than Investments in Related Parties	12 Months Ended
	Dec. 31, 2013
Summary Of Investments Other Than Investments In Related Parties [Abstract]	'
Schedule I - Summary of Investments Other Than Investments in Related Parties	'
	SCHEDULE I
	ENSTAR GROUP LIMITED
	SUMMARY OF INVESTMENTS OTHER THAN INVESTMENTS IN RELATED PARTIES
	AS AT DECEMBER 31, 2013
	(Expressed in thousands of U.S. Dollars)


	Type of investment	Amortized		Fair Value		Amount at
		Cost				which shown
						in the
						balance
						sheet
	Fixed maturity securities and short term investments — Trading
	U.S. government and agency	$	440,148	$	439,946	$	439,946
	Non-U.S. government		469,281		476,224		476,224
	Corporate		2,121,013		2,123,675		2,123,675
	Municipal		40,889		41,034		41,034
	Residential mortgage-backed		219,461		218,457		218,457
	Commercial mortgage-backed		115,351		114,637		114,637
	Asset-backed		247,596		248,748		248,748

	Total		3,653,739		3,662,721		3,662,721

	Fixed maturity securities — Held-to-maturity
	U.S. government and agency		19,992		18,132		19,992
	Non-U.S. government		23,592		22,327		23,592
	Corporate		815,803		759,100		815,803

	Total		859,387		799,559		859,387

	Fixed maturity securities and short term investments — Available-for-sale
	U.S. government and agency		28,050		28,343		28,343
	Non-U.S. government		84,443		86,292		86,292
	Corporate		76,942		77,904		77,904
	Residential mortgage-backed		17,523		17,507		17,507
	Asset-backed		36,344		36,318		36,318

	Total		243,302		246,364		246,364

	Equities		156,686		182,033		182,033
	Other investments				569,293		569,293

	Total			$	5,459,970	$	5,519,798

Schedule_II_Condensed_Financia

Schedule II - Condensed Financial Statements	12 Months Ended
Schedule II - Condensed Financial Statements	Dec. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Schedule II - Condensed Financial Statements	'
	SCHEDULE II
	ENSTAR GROUP LIMITED
	CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT
	BALANCE SHEETS — PARENT COMPANY ONLY
	As of December 31, 2013 and 2012


			2013				2012
			(in thousands of U.S. dollars,
			except share data)
	ASSETS
	Cash and cash equivalents		$	27,989			$	180,810
	Balances due from subsidiaries			363,113				308,364
	Investments in subsidiaries			1,654,508				1,367,286
	Accounts receivable and other assets			306				294

	TOTAL ASSETS		$	2,045,916			$	1,856,754


	LIABILITIES
	Accounts payable and accrued liabilities		$	1,761			$	3,757
	Loans payable			143,258				138
	Balances due to subsidiaries			145,374				299,104

	TOTAL LIABILITIES			290,393				302,999

	COMMITMENTS AND CONTINGENCIES
	SHAREHOLDERS’ EQUITY
	Share capital
	Authorized issued and fully paid, par value $1 each (Authorized 2012: 156,000,000; 2011: 156,000,000)
	Ordinary shares (Issued 2013: 13,802,706; 2012: 13,752,172)			13,803				13,752
	Non-voting convertible ordinary shares:
	Series A (issued 2012: 2,972,892; 2011: 2,972,892)			2,973				2,973
	Series B, C and D (issued and outstanding 2012: 2,725,637; 2011: 2,725,637)			2,726				2,726
	Treasury stock at cost (Series A non-voting convertible ordinary shares 2012: 2,972,892; 2011: 2,972,892)			(421,559	)			(421,559	)
	Additional paid-in capital			962,145				958,571
	Accumulated other comprehensive income			13,978				24,439
	Retained earnings			1,181,457				972,853

	TOTAL SHAREHOLDERS’ EQUITY			1,755,523				1,553,755

	TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		$	2,045,916			$	1,856,754



	See accompanying report of independent registered public accounting firm

	ENSTAR GROUP LIMITED
	CONDENSED FINANCIAL INFORMATION OF REGISTRANT
	STATEMENT OF EARNINGS — PARENT COMPANY ONLY
	For the Years Ended December 31, 2013, 2012 and 2011


			2013				2012				2011
			(in thousands of U.S. dollars)
	INCOME
	Net investment income		$	8,561			$	8,365			$	3,928
	Dividend income from subsidiaries			27,118				92,450				18,900

				35,679				100,815				22,828

	EXPENSES
	Salaries and benefits			117				1,179				2,738
General and administrative expenses			15,747				3,816				17,566
Interest expense			10,475				11,505				9,813
Net foreign exchange (gains) losses			(1,696	)			942				(29	)

			24,643				17,442				30,088

EARNINGS (LOSS) BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES			11,036				83,373				(7,260	)
EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES			197,568				84,644				160,953

NET EARNINGS		$	208,604			$	168,017			$	153,693



See accompanying report of independent registered public accounting firm

ENSTAR GROUP LIMITED
CONDENSED FINANCIAL INFORMATION OF REGISTRANT
STATEMENTS OF CASH FLOWS — PARENT COMPANY ONLY
For the Years Ended December 31, 2013, 2012 and 2011


		2013				2012				2011
		(in thousands of U.S. dollars)
OPERATING ACTIVITIES:
Net cash flows used in operating activities		$	(174,868	)		$	(26,926	)		$	(142,600	)

INVESTING ACTIVITIES:
Return of capital, net			(72,953	)			100,516				18,839

FINANCING ACTIVITIES:
Repayment of loans			—				(64,102	)			(185,442	)
Receipt of loans			95,000				—				167,650
Proceeds from issuance of ordinary shares			—				—				287,377

Net cash flows provided by (used in) financing activities			95,000				(64,102	)			269,585

NET INCREASE IN CASH AND CASH EQUIVALENTS			(152,821	)			9,488				145,824
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR			180,810				171,322				25,498

CASH AND CASH EQUIVALENTS, END OF YEAR		$	27,989			$	180,810			$	171,322



See accompanying report of independent registered public accounting firm

Schedule_III_Supplementary_Ins

Schedule III - Supplementary Insurance Information	12 Months Ended
Schedule III - Supplementary Insurance Information	Dec. 31, 2013
Supplementary Insurance Information [Abstract]	'
Schedule III - Supplementary Insurance Information	'
	SCHEDULE III
	ENSTAR GROUP LIMITED
	SUPPLEMENTARY INSURANCE INFORMATION
	(Expressed in thousands of U.S. Dollars)


		Deferred		Reserves		Unearned		Other		Net		Net			Losses and			Amortization		Other			Net
		Acquisition		for Losses		Premiums		Benefits		Premiums		Investment			Loss			of Deferred		Operating			Premiums
		Costs		and Loss				Payable		Earned		Income			Expenses			Acquisition		Expenses			Written
				Adjustment											and Policy			Costs
				Expenses											Benefits
	2013
	Non-life Run-off	$	—	$	4,004,513	$	1,199	$	—	$	112,611	$	64,048		$	(182,975	)	$	14,379	$	191,268		$	9,233
	Life and Annuities		—		—		3,694		1,273,100		94,984		30,182			78,354			8,820		22,452			63,856
	Active Underwriting		16,744		215,392		65,804		—		32,212		521			19,303			—		9,660			30,104
	Eliminations		—		—		—		—		—		(1,456	)		—			—		(4,132	)		—

	Total	$	16,744	$	4,219,905	$	70,697	$	1,273,100	$	239,807	$	93,295		$	(85,318	)	$	23,199	$	219,248		$	103,193

	2012
	Non-life Run-off	$	—	$	3,650,127	$	—	$	—	$	—	$	76,813		$	(237,953	)	$	—	$	164,143		$	—
	Life and Annuities		—		—		—		11,027		3,511		947			(300	)		—		2,467			3,511
	Eliminations		—		—		—		—		—		—			—			—		(713	)		—

	Total	$	—	$	3,650,127	$	—	$	11,027	$	3,511	$	77,760		$	(238,253	)	$	—	$	165,897		$	3,511

	2011
	Non-life Run-off	$	—	$	4,272,081	$	—	$	—	$	—	$	66,556		$	(293,461	)	$	—	$	170,000		$	—
	Life and Annuities		—		—		—		10,835		3,543		2,120			1,557			—		558			3,543

	Total	$	—	$	4,272,081	$	—	$	10,835	$	3,543	$	68,676		$	(291,904	)	$	—	$	170,558		$	3,543

Schedule_IV_Reinsurance

Schedule IV - Reinsurance	12 Months Ended
Schedule IV - Reinsurance	Dec. 31, 2013
Supplemental Schedule Of Reinsurance Premiums For Insurance Companies [Abstract]	'
Schedule IV - Reinsurance	'
	SCHEDULE IV
	ENSTAR GROUP LIMITED
	REINSURANCE
	For the Years Ended December 31, 2013, 2012 and 2011
	(Expressed in thousands of U.S. Dollars)


		Gross		Ceded to		Assumed		Net		Percentage
				Other		from		Amount		of Amount
				Companies		Other				Assumed
						Companies				to Net
	2013
	Life reinsurance in force	$	—	$	—	$	80,681	$	80,681		100	%

	Premiums Earned:
	Property and Casualty		134,402		11,651		22,072		144,823		15.2	%
	Life and Annuity		87,531		8,131		15,584		94,984		16.4	%

	Total Premiums Earned	$	221,933	$	19,782	$	37,656	$	239,807

	2012
	Life reinsurance in force	$	—	$	—	$	—	$	—		0	%

	Premiums Earned:
	Property and Casualty		—		—		—		—		0	%
	Life and Annuity		5,421		1,910		—		3,511		0	%

	Total Premiums Earned	$	5,421	$	1,910	$	—	$	3,511

	2011
	Life reinsurance in force	$	—	$	—	$	—	$	—		0	%

	Premiums Earned:
	Property and Casualty		—		—		—		—		0	%
	Life and Annuity		5,240		1,697		—		3,543		0	%

	Total Premiums Earned	$	5,240	$	1,697	$	—	$	3,543

Schedule_V_Supplementary_Infor

Schedule V - Supplementary Information Concerning Property/Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2013
Supplemental Information For Property Casualty Insurance Underwriters [Abstract]	'
Schedule V - Supplementary Information Concerning Property/Casualty Insurance Operations	'
	SCHEDULE VI
	ENSTAR GROUP LIMITED
	SUPPLEMENTARY INFORMATION CONCERNING PROPERTY/CASUALTY INSURANCE OPERATIONS
	As at and for the years ended December 31, 2013, 2012 and 2011
	(Expressed in thousands of U.S. Dollars)


		Deferred		Reserves				Net		Net		Net Losses and Loss					Net Paid		Amortization		Other		Net
		Acquisition		for				Premiums		Investment		Expenses Incurred					Losses		of Deferred		Operating		Premiums
		Costs		Unpaid				Earned		Income							and Loss		Acquisition		Expenses		Written
				Losses													Expenses		Costs
				and Loss
				Adjustment
	Affiliation with Registrant			Expenses		Unearned						Current		Prior Year
						Premiums						Year
	Consolidated Subsidiaries
	2013	$	16,744	$	4,219,905	$	67,003	$	144,823	$	63,113	$	93,442	$	(257,114	)	$	401,496	$	23,199	$	200,928	$	39,337
	2012		—		3,650,127		—		—		76,813		—		(237,953	)		314,528		—		164,143		—
	2011		—		4,272,081		—		—		66,556		—		(293,461	)		288,175		—		170,000		—

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Basis of Preparation	'
	Basis of Preparation
	The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).
	Certain reclassifications have been made to the prior year reported amounts to conform to the current year presentation. These reclassifications had no impact on net earnings previously reported.
Basis of Consolidation	'
	Basis of Consolidation
	The consolidated financial statements include the assets, liabilities and results of operations of the Company as of December 31, 2013 and 2012 and for the years ended December 31, 2013, 2012 and 2011. Results of operations for subsidiaries acquired are included from the dates of their acquisition by the Company. Intercompany transactions are eliminated on consolidation.
Use of Estimates	'
	Use of Estimates
	The preparation of these consolidated financial statements requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. While management believes that the amounts included in the consolidated financial statements reflect its best estimates and assumptions, actual results could differ from those estimates. The Company’s principal estimates include, but are not limited to:

		•	reserves for losses and loss adjustment expenses;

		•	policy benefits for life and annuity contracts;

		•	reinsurance balances recoverable, including the provisions for uncollectible amounts;

		•	other-than-temporary impairments in the carrying value of available-for-sale investment securities;

		•	valuation of certain other investments that are measured using significant unobservable inputs;

		•	valuation of goodwill and intangible assets; and

		•	fair value estimates associated with accounting for acquisitions.
Cash and cash equivalents	'
	(a) Cash and cash equivalents
	The Company considers all highly liquid debt instruments purchased with an original maturity of 3 months or less to be cash and cash equivalents.
Investments	'
	(b) Investments
	Short-term investments and fixed maturity investments
	Short-term investments comprise investments with a maturity greater than three months but less than one year from the date of purchase. Fixed maturities comprise investments with a maturity of one year and greater from the date of purchase.
	Short-term investments and fixed maturities classified as trading are carried at fair value, with realized and unrealized holding gains and losses included in net earnings and reported as net realized and unrealized gains and losses.
	Short-term investments and fixed maturity investments classified as held-to-maturity securities, which are securities that the Company has the positive intent and ability to hold to maturity, are carried at amortized cost. The cost of short-term investments and fixed maturities are adjusted for amortization of premiums and accretion of discounts.
	Short-term and fixed maturity investments classified as available-for-sale are carried at fair value, with unrealized gains and losses excluded from net earnings and reported as a separate component of accumulated other comprehensive income. Realized gains and losses on sales of investments classified as available-for-sale are recognized in the consolidated statements of earnings.
	The costs of short-term and fixed maturity investments are adjusted for amortization of premium or discount, recognized using the effective yield method and included in net investment income. For mortgage-backed and asset-backed investments, and any other holdings for which there is a prepayment risk, prepayment assumptions are evaluated and revised on a regular basis.
	Investment purchases and sales are recorded on a trade-date basis. Realized gains and losses on the sale of investments are based upon specific identification of the cost of investments.
	Fixed maturity investments classified as available-for-sale and held-to-maturity are reviewed quarterly to determine if they have sustained an impairment of value that is, based on management’s judgement, considered to be other than temporary. The process includes reviewing each fixed maturity investment that is below cost and: (1) determining if the Company has the intent to sell the fixed maturity investment; (2) determining if it is more likely than not that the Company will be required to sell the fixed maturity investment before its anticipated
	recovery; and (3) assessing whether a credit loss exists, that is, whether the Company expects that the present value of the cash flows expected to be collected from the fixed maturity investment is less than the amortized cost basis of the investment. In evaluating credit losses, the Company considers a variety of factors in the assessment of a fixed maturity investment including: (1) the time period during which there has been a significant decline below cost; (2) the extent of the decline below cost and par; (3) the potential for the investment to recover in value; (4) an analysis of the financial condition of the issuer; (5) the rating of the issuer; and (6) failure of the issuer of the investment to make scheduled interest or principal payments. If management concludes an investment is other-than-temporarily impaired (“OTTI”), then the difference between the fair value and the amortized cost of the investment is presented as an OTTI charge in the consolidated statements of earnings, with an offset for any noncredit-related loss component of the OTTI charge to be recognized in other comprehensive income. Accordingly, only the credit loss component of the OTTI amount would have an impact on the Company’s earnings.
	Equities
	Equities are classified as trading and are carried at fair value with realized and unrealized holding gains and losses included in net earnings and reported as net realized and unrealized gains and losses.
	Other investments
	Other investments include investments in limited partnerships and limited liability companies (collectively “private equities”) and fixed income, hedge, equity and real estate debt funds (collectively “funds”) that carry their investments at fair value. These funds are stated at fair value, which ordinarily will be the most recently reported net asset value as advised by the fund manager or administrator. Many of the Company’s fund investments publish net asset values on a daily basis and provide daily liquidity; others report on a monthly basis. Private equities typically report quarterly. The Company believes the reported net asset value represents the fair value market participants would apply to an interest in the various private equities or funds. The change in fair value is included in net realized and unrealized gains on investments and recognized in net earnings.
Derivative instruments	'
	(c) Derivative instruments
	The Company recognizes all derivatives as either assets or liabilities in the consolidated balance sheets and carries them at the fair value of the instrument. The Company uses derivative instruments for purposes of its overall foreign currency risk management strategy. Changes in fair value and realized gains or losses on derivative instruments are recorded in net foreign exchange gains and losses.
Losses and loss adjustment expenses	'
	(d) Losses and loss adjustment expenses
	Non-life run-off
	The liability for losses and loss adjustment expenses includes an amount determined from reported claims and an amount, based on historical loss experience and industry statistics, for losses incurred but not reported determined using a variety of actuarial methods. These estimates are continually reviewed and are necessarily subject to the impact of future changes in factors such as claim severity and frequency, changes in economic conditions including the impact of inflation, legal developments and changes in social attitudes. While management believes that the amount is adequate, the ultimate liability may be significantly in excess of, or less than, the amounts provided. Adjustments will be reflected as part of net increase or reduction in losses and loss adjustment expense liabilities in the periods in which they become known. Premium and commission adjustments may be triggered by incurred losses and any amounts are recorded in the same period that the related incurred loss is recognized.
	Commutations provide an opportunity for the Company to exit exposures to entire policies with insureds and reinsureds for an agreed upon payment, or payments, often at a discount to the previously estimated ultimate liability. As a result of exiting all exposures to such policies, all advised case reserves and incurred but not reported (“IBNR”) reserves relating to the insured or reinsured are eliminated. A commutation is recognized upon the execution of a commutation release agreement. Following completion of a commutation, all the related balances, including insurance and reinsurance balances payable and/or receivable, funds held by ceding companies, and losses and loss adjustment expenses (including fair value adjustments and estimated IBNR), are written off with corresponding gain or loss recorded in the net reduction of ultimate losses. A commutation may result in a net gain irrespective of whether the settlement exceeds the advised case reserves. Advised case reserves are those reserve estimates for a specific loss or losses reported to the Company by either the broker or insured or reinsured. IBNR reserves are established by the Company at a class of business or exposure level for claims that have not yet been reported to the Company but can reasonably be expected to have occurred, as well as for the future development of reported claims. A commutation settlement is a negotiated settlement of both the advised case reserves and an estimate of the IBNR reserves that relate to the policies being commuted. For latent exposures with a long reporting tail, the estimated level of IBNR reserves may be significantly higher than the advised case reserves. In such an instance, the commutation settlement of a block of such policies may be greater than the advised case reserves but less than the aggregate of the advised case reserves plus the estimated related IBNR reserves, resulting in a total saving to the remaining liability.
	To the extent possible, all prior historical loss development that relates to commuted exposures is eliminated to produce revised historical loss development for the remaining non-commuted exposures. The Company’s estimates of IBNR reserves are not determined at the policyholder level but at the aggregate class of business or exposure level. Therefore, the Company does not typically identify a specific amount of IBNR reserves settled with each commutation. Rather, on an annual basis in the fourth quarter, the Company’s actuaries apply their actuarial methodologies to the remaining aggregate exposures and revised historical loss development information to reassess their estimates of gross and net ultimate liabilities and required gross and net IBNR reserves. Should a commutation that the Company considers significant occur in one of the first three quarters, then the Company, in conjunction with its independent actuaries, would estimate the amount of IBNR that would be associated with the policies being commuted. If the financial impact (including release of IBNR) of the commutation is considered significant, the Company would adjust its estimate of ultimate loss and loss adjustment expense liabilities in the quarter that the commutation was concluded. The agreed commutation settlement is recorded in net losses paid.
	To the extent that commuted policies are protected by reinsurance, then the Company will, on completion of a commutation with an insured or reinsured, negotiate with the reinsurers to contribute their share of the commutation settlement. Any amounts received from such reinsurers will be recorded in net losses paid and the impact of any savings or loss on reinsurance recoverable on unpaid losses will be included in the actuarial reassessment of net ultimate liabilities and net IBNR reserves.
	Commutations of acquired companies’ exposures have the effect of accelerating the payout of claims compared to the probability-weighted ranges of actuarially projected cash flows that the Company applies when estimating the fair values of assets and liabilities at the time of acquisition. Any material acceleration of payout together with the impact of any material loss reserve savings in any period will also accelerate the amortization of fair value adjustments in that period.
	The Company’s insurance and reinsurance subsidiaries also establish provisions for loss adjustment expenses relating to run-off costs for the estimated duration of the run-off, which are included in losses and loss adjustment expenses. These provisions are assessed at each reporting date, and provisions relating to future periods are adjusted to reflect any changes in estimates of the periodic run-off costs or the duration of the run-off, including the impact of any acceleration of the run-off period that may be caused by commutations. Provisions relating to the current period together with any adjustment to future run-off provisions are included in net reduction in ultimate loss and loss adjustment expenses in the consolidated statements of earnings.

	Active underwriting
	The reserve for losses and loss expenses includes reserves for unpaid reported losses and for IBNR reserves. The reserves for unpaid reported losses and loss expenses are established by management based on reports from brokers, ceding companies and insureds and represents the estimated ultimate cost of events or conditions that have been reported to, or specifically identified by the Company. The reserve for incurred but not reported losses and loss expenses is established by management based on actuarially determined estimates of ultimate losses and loss expenses. Inherent in the estimate of ultimate losses and loss expenses are expected trends in claim severity and frequency and other factors which may vary significantly as claims are settled. Accordingly, ultimate losses and loss expenses may differ materially from the amounts recorded in the consolidated financial statements. These estimates are reviewed regularly and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments, if any, will be recorded in earnings in the period in which they become known. Prior period development arises from changes to loss estimates recognized in the current year that relate to loss reserves established in previous calendar years.
Reinsurance balances recoverable	'
	(e) Reinsurance balances recoverable
	Amounts billed to, and due from, reinsurers result from paid movements in the underlying assumed business and are calculated in accordance with the terms of the individual reinsurance contracts.
	Similarly, reinsurance balances recoverable related to the Company’s assumed case reserves are calculated by applying the terms of any applicable reinsurance coverage to movements in the underlying assumed case reserves. The Company’s estimate of reinsurance balances recoverable related to its assumed IBNR reserves is recognized on a basis consistent with the underlying assumed IBNR reserves.
	The Company’s reinsurance balances recoverable are presented net of a provision for uncollectible amounts, reflecting the amount deemed not collectible due to credit quality, collection problems due to location of the reinsurer, contractual disputes with reinsurers over individual contentious claims, contract language or coverage or for some other reason.
Retroactive reinsurance and novations	'
	(f) Retroactive reinsurance and novations
	Consideration received for business assumed by way of novation and premiums received on retroactive reinsurance is recorded in the balance sheet. The difference between the consideration received and liabilities assumed is recorded as an intangible asset or liability. Intangible assets or liabilities are subsequently amortized using the interest method over the expected claims settlement periods. As changes in estimates of timing or amount of losses and loss adjustment expenses are recognized, the amortization is adjusted retrospectively and included in losses and loss adjustment expenses in the period of the charge.
Premium revenue recognition	'
	(g) Premium revenue recognition
	Premiums written are earned on a pro-rata basis over the period the coverage is provided. Reinsurance premiums are recorded at the inception of the policy, are based upon contractual terms and for certain business is estimated based on underlying contracts or from information provided by clients and/or brokers. Changes in reinsurance premium estimates are expected and may result in significant adjustments in future periods. These estimates change over time as additional information regarding changes in underlying exposures is obtained. Any subsequent differences arising on such estimates are recorded as premiums written in the period they are determined.
	Insurance premiums are recorded at the inception of the policy and are earned on a pro-rata basis over the period of coverage.

	Unearned premiums represent the portion of premiums written that relate to the unexpired terms of policies in force. Premiums ceded are similarly pro-rated over the period the coverage is provided with the unearned portion being deferred as prepaid reinsurance premiums.
	Certain contracts that the Company wrote, prior to going into run-off, are retrospectively rated and additional premium will be due should losses exceed pre-determined, contractual thresholds. These required additional premiums are based upon contractual terms and management judgment is involved with respect to the estimate of the amount of losses that the Company expects to be ceded. Additional premiums are recognized at the time loss thresholds specified in the contract are exceeded and are earned over the coverage period, or are earned immediately if the period of risk coverage has passed. Changes in estimates of losses recorded on contracts with additional premium features will result in changes in additional premiums based on contractual terms.
	Life and annuities
	The Pavonia companies, prior to going into run-off, wrote various U.S. and Canadian life insurance, including credit life and disability insurance, term life insurance, assumed life reinsurance and annuities. The Pavonia companies will continue to recognize premiums on term life insurance, assumed life reinsurance and credit life and disability insurance.
	Premiums from term life insurance, credit life and disability insurance and assumed life reinsurance are generally recognized as revenue when due from policyholders. Term life, assumed life reinsurance and credit life and disability policies include those contracts with fixed and guaranteed premiums and benefits. Benefits and expenses are matched with such revenue to result in the recognition of profit over the life of the contracts.
Premiums Receivable	'
	(h) Premiums Receivable
	Premiums receivable represent amounts currently due and amounts not yet due on insurance and reinsurance policies. Premiums for insurance policies are generally due at inception. Premiums for reinsurance policies generally become due over the period of coverage based on the policy terms. The Company monitors the credit risk associated with premiums receivable, taking into consideration that credit risk is reduced by the Company’s contractual right to offset loss obligations or unearned premiums against premiums receivable. Amounts deemed uncollectible are charged to net earnings in the period they are determined. Changes in the estimate of premiums written will result in an adjustment to premiums receivable in the period they are determined. Certain contracts are retrospectively rated and provide for a final adjustment to the premium based on the final settlement of all losses. Premiums receivable on such contracts are adjusted based on the estimate of losses the Company expects to incur, and are not considered due until all losses are settled.
Policy Benefits for Life and Annuity Contracts	'
	(i) Policy Benefits for Life and Annuity Contracts
	The Company’s policy benefits for life and annuity contracts (“policy benefits”) are calculated using standard actuarial techniques and cash flow models in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 944, Financial Services — Insurance. The Company establishes and maintains its policy benefits at a level that the Company estimates will, when taken together with future premium payments and investment income expected to be earned on associated premiums, be sufficient to support all future cash flow benefit obligations and third party servicing obligations as they become payable. The Company reviews its policy benefits regularly and performs loss recognition testing based upon cash flow projections.

	Since the development of the policy benefits is based upon cash flow projection models, the Company makes estimates and assumptions based on experience and industry mortality tables, longevity and morbidity rates, lapse rates, expenses and investment experience, including a provision for adverse deviation. The assumptions used to determine policy benefits are determined at the inception of the contracts, reviewed and adjusted at the point of acquisition, as required, and are locked-in throughout the life of the contract unless a premium deficiency develops. The assumptions are reviewed no less than annually and are unlocked if they would result in a material adverse reserve change. The Company establishes these estimates based upon transaction-specific historical experience, information provided by the ceding company for the assumed business and industry experience. Actual results could differ materially from these estimates. As the experience on the contracts emerges, the assumptions are reviewed by management. The Company determines whether actual and anticipated experience indicates that existing policy benefits, together with the present value of future gross premiums, are sufficient to cover the present value of future benefits, settlement and maintenance costs and to recover unamortized acquisition costs. If such a review indicates that policy benefits should be greater than those currently held, then the locked-in assumptions are revised and a charge for policy benefits is recognized at that time.
	Because of the many assumptions and estimates used in establishing policy benefits and the long-term nature of the contracts, the reserving process, while based on actuarial techniques, is inherently uncertain.
Redeemable noncontrolling interest	'
	(j) Redeemable noncontrolling interest
	In connection with the acquisitions of Arden and Atrium, and with the proposed acquisition of Torus Insurance Holdings Limited (“Torus”), (as described in Note 3, —Acquisitions) certain subsidiaries have issued or will issue shares to a noncontrolling interest. These shares provide certain redemption rights to the holder, which may be settled in the Company’s own shares or cash, at the Company’s option. The Company classifies redeemable noncontrolling interest with redemption features that are not solely within the control of the Company within temporary equity in its consolidated balance sheets and carries them at the redemption value, which is fair value. The Company recognizes changes in the fair value that exceed the carrying value of redeemable noncontrolling interest through retained earnings as if the balance sheet date were also the redemption date. For a description of the redemption rights refer to Note 3 — Acquisitions.
Fees and commission income	'
	(k) Fees and commission income
	Fixed fee income is recognized in accordance with the term of the Company’s third-party management agreements. Time-based fees are recognized as services are provided. Success-based fees are recognized when all of the contractual requirements specified in the agreement are met. Profit commissions are recorded on an accruals basis, and are earned in line with the annual accounting results of the syndicate managed by Atrium.
Foreign exchange	'
	(l) Foreign exchange
	The reporting currency of the Company is the U.S. dollar. Assets and liabilities of entities whose functional currency is not the U.S. dollar are translated at period end exchange rates. Revenue and expenses of such foreign entities are translated at average exchange rates during the year. The effect of the currency translation adjustments for these foreign entities is included in accumulated other comprehensive income.
	Other foreign currency assets and liabilities that are considered monetary items are translated at exchange rates in effect at the balance sheet date. Foreign currency revenues and expenses are translated at transaction date exchange rates. These exchange gains and losses are included in the determination of net earnings.
Earnings per share	'
	(m) Earnings per share
	Basic earnings per share is based on the weighted average number of ordinary shares outstanding and excludes any dilutive effects of warrants, options and convertible securities. Diluted earnings per share is based on the weighted average number of ordinary and ordinary share equivalents outstanding calculated using the treasury stock method for all potentially dilutive securities. When the effect of dilutive securities would be anti-dilutive, these securities are excluded from the calculation of diluted earnings per share.
Acquisitions	'
	(n) Acquisitions
	The Company uses the purchase method in accounting for acquisitions. The difference between the fair value of net assets acquired and purchase price is recorded as goodwill or negative goodwill.
	The purchase method of accounting requires that the acquirer record the assets and liabilities acquired at their estimated fair value. The fair values of each of the reinsurance assets and liabilities acquired are derived from probability-weighted ranges of the associated projected cash flows, based on actuarially prepared information and management’s strategy. The Company’s run-off strategy, as well as that of other run-off market participants, is expected to be different from the sellers as generally sellers are not specialized in running off insurance and reinsurance liabilities whereas the Company and other market participants do specialize in such run-offs.
	The key assumptions used by the Company and, it believes, by other run-off market participants in the fair valuation of acquired companies are (i) the projected payout, timing and amount of claims liabilities; (ii) the related projected timing and amount of reinsurance collections; (iii) a risk-free discount rate, which is applied to determine the present value of the future cash flows; (iv) the estimated unallocated loss adjustment expenses to be incurred over the life of the run-off; (v) the impact of any accelerated run-off strategy; and (vi) an appropriate risk margin.
	The difference between the original carrying value of reinsurance liabilities and reinsurance assets acquired at the date of acquisition and their fair value is recorded as an intangible asset or other liability, which the Company refers to as the fair value adjustment (“FVA”). The FVA is amortized over the estimated payout period of outstanding losses and loss expenses acquired. To the extent the actual payout experience after the acquisition is materially faster or slower than anticipated at the time of the acquisition, there is an adjustment to the estimated ultimate loss reserves, or there are changes in bad debt provisions or in estimates of future run-off costs following accelerated payouts, then the amortization of the FVA is adjusted to reflect such changes.
Goodwill	'
	(o) Goodwill
	Goodwill represents the excess of the purchase price over the fair value of the net assets acquired. The Company performs an initial valuation of its goodwill assets and assesses goodwill for impairment on an annual basis. If, as a result of the assessment, the Company determines the value of its goodwill asset is impaired, goodwill is written down in the period in which the determination is made. No impairment has been recorded as a result of the assessment.
Intangible Assets	'
	(p) Intangible Assets
	Intangible assets represent the fair value adjustments related to unpaid losses and loss expenses, reinsurance balances recoverable and policy benefits for life and annuity contracts along with the fair values of Lloyd’s syndicate capacity, customer relationships, management contract and brand arising from the acquisition of Atrium. Definite-lived intangible assets are amortized over their useful lives. The Company recognizes the amortization of all intangible assets in the consolidated statement of earnings. Indefinite-lived intangible assets are not subject to amortization. The carrying values of intangible assets are reviewed for indicators of impairment on at least an annual basis. Impairment is recognized if the carrying values of the intangible assets are not recoverable from their undiscounted cash flows and are measured as the difference between the carrying value and the fair value
Stock-based compensation	'
	(q) Share-based compensation
	Share-based payment awards settled in ordinary shares are recorded in additional paid-in capital. The fair value of the award is measured at the grant date and expensed over the vesting period.
Income taxes	'
	(r) Income taxes
	Certain subsidiaries and branches of the Company operate in jurisdictions where they are subject to taxation. Current and deferred income taxes are charged or credited to net income, or, in certain cases, to accumulated other comprehensive income, based upon enacted tax laws and rates applicable in the relevant jurisdiction in the period in which the tax becomes accruable or realizable. Deferred income taxes are provided for all temporary differences between the bases of assets and liabilities used in the financial statements and those used in the various jurisdictional tax returns. When management’s assessment indicates that it is more likely than not that deferred income tax assets will not be realized, a valuation allowance is recorded against the deferred tax assets.
	The Company recognizes a tax benefit relating to uncertain tax positions only where the position is more likely than not to be sustained assuming examination by tax authorities. A liability is recognized for any tax benefit (along with any interest and penalty, if applicable) claimed in a tax return in excess of the amount allowed to be recognized in the financial statements under U.S. GAAP. Any changes in amounts recognized are recorded in the period in which they are determined.
New Accounting Standards Adopted in 2013	'
	New Accounting Standards Adopted in 2013
	ASU 2011-11, Disclosures About Offsetting Assets and Liabilities
	In December 2011, the FASB issued new disclosure requirements regarding the nature of an entity’s rights of setoff and related arrangements associated with its financial instruments and derivative instruments. The new disclosures are designed to make financial statements that are prepared under U.S. GAAP more comparable to those prepared under International Financial Reporting Standards. The Company adopted the amended guidance effective January 1, 2013. The adoption of the guidance did not have a material impact on the consolidated financial statements.
	ASU 2013-02, Presentation of Items Reclassified from Accumulated Other Comprehensive Income
	In February 2013, the FASB issued new disclosure requirements for items reclassified from accumulated other comprehensive income. This guidance requires entities to disclose in a single location (either on the face of the financial statement that reports net earnings or in the notes) the effects of reclassification out of accumulated other comprehensive income. The Company adopted this guidance effective January 1, 2013. The adoption of the guidance did not have a material impact on the consolidated financial statements.
Recently Issued Accounting Pronouncements Not Yet Adopted	'
	Recently Issued Accounting Pronouncements Not Yet Adopted
	ASU 2013-11 Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The objective of ASU 2013-11 is to improve the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 seeks to reduce the diversity in practice by providing guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 is effective for annual and interim reporting periods beginning after December 15, 2013, with both early adoption and retrospective application permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position.

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
Acquisitions (Tables)	Dec. 31, 2013
Pro Forma Condensed Combined Statement of Earnings	'
	The following pro forma condensed combined statement of earnings for the years ended December 31, 2013 and 2012 combines the historical consolidated statements of earnings of the Company (inclusive of those of SeaBright since its acquisition on February 7, 2013) with those of Atrium, Arden and Pavonia, giving effect to the business combinations and related transactions of Atrium, Arden and Pavonia as if they had occurred on January 1, 2013 and 2012, respectively. For the year ended December 31, 2013, the results shown for Atrium, Arden and Pavonia represent their results from January 1, 2013 to the respective date of each acquisition. The results for Atrium, Arden and Pavonia post-acquisition are included in the results shown for the Company.
	The pro forma financial information presented below is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisitions of Atrium, Arden and the Pavonia companies had taken place on January 1, 2013 or 2012, respectively.


						Unaudited
	Twelve Months Ended December 31, 2013	Enstar Group				Atrium				Arden				Pavonia				Pro forma			Enstar Group
		Limited																Adjustments			Limited - Pro
																					Forma
	Total income	$	416,570			$	91,126			$	15,911			$	48,275			$	—		$	571,882
	Total expenses		(192,748	)			(68,545	)			(18,783	)			(48,094	)			(9,531	)		(337,701	)
	Noncontrolling interest		(15,218	)			—				—				—				(7,170	)		(22,388	)

	Net earnings	$	208,604			$	22,581			$	(2,872	)		$	181			$	(16,701	)	$	211,793

	Net earnings per ordinary																				$	12.82
	share —basic																				$	12.82

	Net earnings per ordinary																				$	12.68
	share —diluted																				$	12.68

	Weighted average ordinary shares outstanding — basic																					16,523,369

	Weighted average ordinary shares outstanding — diluted																					16,703,442

	Unaudited
	Twelve Months Ended December 31, 2012	Enstar Group				Atrium				Arden				Pavonia				Pro forma			Enstar Group
		Limited																Adjustments			Limited - Pro
																					Forma
	Total income	$	163,453			$	82,343			$	199,939			$	280,227			$	—		$	725,962
	Total expenses		28,066				(52,277	)			(108,185	)			(267,983	)			(21,855	)		(422,234	)
	Noncontrolling interest		(23,502	)			—				—				—				(47,971	)		(71,473	)

	Net earnings	$	168,017			$	30,066			$	91,754			$	12,244			$	(69,826	)	$	232,255

	Net earnings per ordinary share — basic																				$	14.13

	Net earnings per ordinary																				$	13.96
	share — diluted																				$	13.96

	Weighted average ordinary shares outstanding — basic																					16,441,461

	Weighted average ordinary shares outstanding — diluted																					16,638,021

Summary of Pro Forma Adjustments to Pro Forma Condensed Combined Statement of Earnings	'
	Summary of the Pro Forma Adjustments to the Pro Forma Condensed Combined Statement of Earnings for the Twelve Months Ended December 31, 2013 (Unaudited):


				Unaudited
	Expenses			Atrium				Arden				Pavonia				Total
	(i)	Adjustment to interest expense to reflect the financing costs of the acquisition for the year		$	(3,105	)		$	(1,111	)		$	(442	)		$	(4,658	)
	(ii)	Adjustment to recognize amortization of definite lived intangible assets			(2,033	)			(218	)			(2,825	)			(5,076	)
	(iii)	Net adjustment related to the unlocking and reassessment of the actuarial estimates of the business acquired			—				—				(2,166	)			(2,166	)
	(iv)	Adjustment to income taxes for pro forma adjustments			467				—				1,902				2,369

				$	(4,671	)		$	(1,329	)		$	(3,531	)		$	(9,531	)
	(v)	Adjustment to noncontrolling interest for pro forma adjustments		$	(8,406	)		$	1,236			$	—			$	(7,170	)
	Summary of the Pro Forma Adjustments to the Pro Forma Condensed Combined Statement of Earnings for the Twelve Months Ended December 31, 2012 (Unaudited):


				Unaudited
	Expenses			Atrium				Arden				Pavonia				Total
	(i)	Adjustment to interest expense to reflect the financing costs of the acquisition for the year		$	(3,685	)		$	(1,854	)		$	(2,227	)		$	(7,766	)
	(ii)	Adjustment to recognize amortization of definite lived intangible assets			(2,033	)			(327	)			(11,300	)			(13,660	)
	(iii)	Net adjustment related to the unlocking and reassessment of the actuarial estimates of the business acquired			—				—				(8,664	)			(8,664	)
	(iv)	Adjustment to income taxes for pro forma adjustments			468				—				7,767				8,235

				$	(5,250	)		$	(2,181	)		$	(14,424	)		$	(21,855	)
	(v)	Adjustment to noncontrolling interest for pro forma adjustments		$	(11,400	)		$	(36,571	)		$	—			$	(47,971	)
Atrium [Member]	'
Purchase Price and Fair Value of Assets Acquired	'
	The purchase price and net assets acquired at fair value are as follows:


	Purchase price	$	158,000

	Net assets acquired at fair value	$	119,152

	Excess of purchase price over fair value of net assets acquired	$	38,848

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition	'
	The following table summarizes the provisional fair values of the assets acquired and liabilities assumed at the acquisition date.


	ASSETS
	Short-term investments, available-for-sale, at fair value	$	33,535
	Short-term investments, trading, at fair value		12,526
	Fixed maturities, available-for-sale, at fair value		156,142
	Fixed maturities, trading, at fair value		10,751

	Total investments		212,954
	Cash and cash equivalents		44,842
	Restricted cash and cash equivalents		12,305
	Premiums receivable		41,855
	Reinsurance balances recoverable		32,375
	Deferred premium		26,224
	Funds withheld		19,579
	Intangibles		90,000
	Other assets		7,977

	TOTAL ASSETS		488,111

	LIABILITIES
	Losses and loss adjustment expenses		216,319
	Insurance and reinsurance balances payable		20,834
	Unearned premium		42,738
	Deferred taxes		39,740
	Other liabilities		49,328

	TOTAL LIABILITIES		368,959

	NET ASSETS ACQUIRED AT FAIR VALUE		119,152
	Goodwill		38,848

	ACQUISITION DATE FAIR VALUE	$	158,000

Summary of Provisional Intangible Assets Recorded in Connection with Acquisition	'
	The following table summarizes the provisional intangible assets recorded in connection with the acquisition:


		Amount				Economic
		Amount				Useful Life
	Syndicate capacity	$	32,900			Indefinite
	Management contract		30,100			Indefinite
	Distribution channel		20,000			15 Years
	Brand		7,000			10 years

	Intangible assets as of the acquisition date	$	90,000

Arden [Member]	'
Purchase Price and Fair Value of Assets Acquired	'
	The purchase price for Arden was $79.6 million. Kenmare’s portion of the purchase price was $47.8 million, and was financed by borrowings under the Company’s revolving credit facility.


	Purchase price	$	79,600

	Net assets acquired at fair value	$	79,600

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition	'
	The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


		Active				Non-life				Total
		Underwriting				Run-off				Total
	ASSETS
	Short-term investments, trading, at fair value	$	16,340			$	12,512			$	28,852
	Fixed maturities, trading, at fair value		9,351				46,077				55,428
	Other investments		—				2,867				2,867

	Total investments		25,691				61,456				87,147
	Cash and cash equivalents		—				23,037				23,037
	Restricted cash and cash equivalents		10,213				21,599				31,812
	Premiums receivable		74,452				49,769				124,221
	Reinsurance balances recoverable		—				354,810				354,810
	Other assets		—				12,016				12,016

	TOTAL ASSETS		110,356				522,687				633,043

	LIABILITIES
	Losses and loss adjustment expenses		56,160				427,567				483,727
	Insurance and reinsurance balances payable		—				59,304				59,304
	Unearned premium		—				10,412				10,412

	TOTAL LIABILITIES		56,160				497,283				553,443

	NET ASSETS ACQUIRED AT FAIR VALUE	$	54,196			$	25,404			$	79,600

Pavonia [Member]	'
Purchase Price and Fair Value of Assets Acquired	'
	The purchase price and fair value of the assets acquired in the Pavonia acquisition were as follows:


	Purchase price	$	155,564

	Net assets acquired at fair value	$	155,564

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition	'
	The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


	ASSETS
	Short-term investments, trading, at fair value	$	40,404
	Short-term investments, held-to-maturity, at fair value		10,268
	Fixed maturities, trading, at fair value		329,985
	Fixed maturities, held-to-maturity, at fair value		876,474

	Total investments		1,257,131
	Cash and cash equivalents		81,849
	Accrued interest receivable		15,183
	Funds held by reinsured companies		47,761
	Other assets		59,002

	TOTAL ASSETS		1,460,926

	LIABILITIES
	Policyholder benefits for life and annuity contracts		1,255,632
	Reinsurance balances payable		39,477
	Unearned premium		5,618
	Other liabilities		4,635

	TOTAL LIABILITIES		1,305,362

	NET ASSETS ACQUIRED AT FAIR VALUE	$	155,564

SeaBright [Member]	'
Purchase Price and Fair Value of Assets Acquired	'
	The purchase price and fair value of the assets acquired in the SeaBright acquisition were as follows:


	Purchase price	$	252,091

	Net assets acquired at fair value	$	252,091

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition	'
	The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


	ASSETS
	Short-term investments, trading, at fair value	$	25,171
	Fixed maturities, trading, at fair value		683,780

	Total investments		708,951
	Cash and cash equivalents		41,846
	Accrued interest receivable		6,344
	Premiums receivable		112,510
	Reinsurance balances recoverable		117,462
	Other assets		4,515

	TOTAL ASSETS		991,628

	LIABILITIES
	Losses and loss adjustment expenses		592,774
	Unearned premium		93,897
	Loans payable		12,000
	Insurance balances payable		3,243
	Other liabilities		37,623

	TOTAL LIABILITIES		739,537

	NET ASSETS ACQUIRED AT FAIR VALUE	$	252,091

Clarendon [Member]	'
Purchase Price and Fair Value of Assets Acquired	'
	The purchase price and fair value of the assets acquired in the Clarendon acquisition were as follows:


	Purchase price	$	219,077

	Net assets acquired at fair value	$	219,077

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition	'
	The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


	ASSETS
	Short-term investments, trading	$	60,376
	Fixed maturities, trading		623,530
	Equities		5,014

	Total investments		688,920
	Cash and cash equivalents		138,518
	Restricted cash and cash equivalents		7,198
	Reinsurance balances recoverable		1,065,341
	Accrued interest and other receivables		9,655

	TOTAL ASSETS		1,909,632

	LIABILITIES
	Losses and loss adjustment expenses		1,654,436
	Insurance and reinsurance balances payable		1,942
	Funds withheld		26,277
	Accounts payable		7,900

	TOTAL LIABILITIES		1,690,555

	NET ASSETS ACQUIRED AT FAIR VALUE	$	219,077

Laguna [Member]	'
Purchase Price and Fair Value of Assets Acquired	'
	The purchase price and fair value of the net assets acquired in the Laguna acquisition were as follows:


	Purchase price	$	21,223

	Net assets acquired at fair value	$	34,328

	Excess of net assets over purchase price (gain on bargain purchase)	$	(13,105	)

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition	'
	The following summarizes the estimated fair values of the assets acquired and the liabilities assumed as of the date of acquisition:


	ASSETS
	Short-term investments, trading	$	1,154
	Fixed maturities, trading		30,765

	Total investments		31,919
	Cash and cash equivalents		13,274
	Reinsurance balances recoverable		1,459
	Other assets		1,325

	TOTAL ASSETS		47,977

	LIABILITIES
	Losses and loss adjustment expenses		11,898
	Accounts payable		1,751

	TOTAL LIABILITIES		13,649

	NET ASSETS ACQUIRED AT FAIR VALUE	$	34,328

Investments_Tables

Investments (Tables)	12 Months Ended
Investments (Tables)	Dec. 31, 2013
Estimated Fair Values of Investments in Fixed Maturity Securities, Short-Term Investments and Equities, Trading Securities	'
	The estimated fair values of the Company’s investments in fixed maturity securities, short-term investments and equities classified as trading securities were as follows:


		December 31,			December 31,
		2013			2012
	U.S. government and agency	$	439,946		$	361,906
	Non-U.S. government		476,224			265,722
	Corporate		2,123,675			1,598,876
	Municipal		41,034			20,446
	Residential mortgage-backed		218,457			115,594
	Commercial mortgage-backed		114,637			130,848
	Asset-backed		248,748			78,929

	Total fixed maturity and short-term investments		3,662,721			2,572,321
	Equities — U.S.		115,285			92,406
	Equities — International		66,748			22,182

		$	3,844,754		$	2,686,909

Credit Ratings of Fixed Maturity Securities and Short-Term Investments, Trading	'
	The following tables set forth certain information regarding the credit ratings (provided by major rating agencies) of the Company’s fixed maturity securities and short-term investments classified as trading:


	As at December 31, 2013	Fair Value			% of Total
	As at December 31, 2013	Fair Value			Fair Value
	AAA	$	502,057			13.7	%
	AA		1,430,107			39.1	%
	A		1,191,142			32.5	%
	BBB or lower		461,614			12.6	%
	Not Rated		77,801			2.1	%

		$	3,662,721			100	%



	As at December 31, 2012	Fair Value			% of Total
	As at December 31, 2012	Fair Value			Fair Value
	AAA	$	418,297			16.3	%
	AA		958,267			37.2	%
	A		812,428			31.6	%
	BBB or lower		376,347			14.6	%
	Not Rated		6,982			0.3	%

		$	2,572,321			100	%

Amortized Cost and Estimated Fair Values of Company's Fixed Maturity Securities Classified as Held to Maturity	'
	The amortized cost and estimated fair values of the Company’s fixed maturity securities classified as held-to-maturity were as follows:


	As at December 31, 2013	Amortized			Gross			Gross			Fair Value
		Cost			Unrealized			Unrealized
					Holding			Holding
					Gains			Losses
								Non-OTTI
	U.S. government and agency	$	19,992		$	6		$	(1,866	)	$	18,132
	Non-U.S. government		23,592			19			(1,284	)		22,327
	Corporate		815,803			105			(56,808	)		759,100

		$	859,387		$	130		$	(59,958	)	$	799,559
Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity	'
	The contractual maturities of the Company’s fixed maturity securities classified as held-to-maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.


	As at December 31, 2013	Amortized			Fair			% of Total
	As at December 31, 2013	Cost			Value			Fair Value
	Due in one year or less	$	17,541		$	17,579			2.2	%
	Due after one year through five years		87,698			86,611			10.8	%
	Due after five years through ten years		133,102			126,541			15.8	%
	Due after ten years		621,046			568,828			71.2	%

		$	859,387		$	799,559			100	%
Credit Ratings Company's Fixed Maturity Securities Held to Maturity	'
	The following table set forth certain information regarding the credit ratings (provided by major rating agencies) of the Company’s fixed maturity securities classified as held-to-maturity:


	As at December 31, 2013	Amortized			Fair			% of Total
	As at December 31, 2013	Cost			Value			Fair Value
	AAA	$	47,949		$	44,552			5.6	%
	AA		259,163			239,188			29.9	%
	A		496,986			463,001			57.9	%
	BBB or lower		54,759			52,282			6.5	%
	Not Rated		530			536			0.1	%

		$	859,387		$	799,559			100	%
Amortized Cost and Estimated Fair Values of Company's Fixed Maturity Securities Classified as Available-for-Sale	'
	The amortized cost and estimated fair values of the Company’s fixed maturity securities and short-term investments classified as available-for-sale were as follows:


	As at December 31, 2013	Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Holding			Holding
					Gains			Losses
								Non-OTTI
	U.S. government and agency	$	28,050		$	303		$	(10	)	$	28,343
	Non-U.S. government		84,443			1,871			(22	)		86,292
	Corporate		76,942			1,221			(259	)		77,904
	Residential mortgage-backed		17,523			102			(118	)		17,507
	Asset-backed		36,344			4			(30	)		36,318

		$	243,302		$	3,501		$	(439	)	$	246,364



	As at December 31, 2012	Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value
					Holding			Holding
					Gains			Losses
								Non-OTTI
	U.S. government and agency	$	4,503		$	454		$	—		$	4,957
	Non-U.S. government		120,634			3,373			(151	)		123,856
	Corporate		115,139			2,379			(524	)		116,994
	Residential mortgage-backed		4,308			230			(40	)		4,498
	Commercial mortgage-backed		474			7			—			481
	Asset-backed		338			9			(12	)		335

		$	245,396		$	6,452		$	(727	)	$	251,121
Summary of Investments Classified as Available-for-Sale in Unrealized Loss Position as Well as Aggregate Fair Value and Gross Unrealized Loss by Length of Time	'
	The following tables summarize the Company’s fixed maturity securities and short-term investments classified as available-for-sale in an unrealized loss position as well as the aggregate fair value and gross unrealized loss by length of time the securities have continuously been in an unrealized loss position:


		12 Months or Greater						Less Than 12 Months						Total
	As at December 31, 2013	Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
	As at December 31, 2013	Value			Losses			Value			Losses			Value		Losses
	U.S. government and agency	$	—		$	—		$	11,416		$	(10	)	$	11,416	$	(10	)
	Non-U.S. government		—			—			20,406			(22	)		20,406		(22	)
	Corporate		—			—			51,478			(259	)		51,478		(259	)
	Residential mortgage-backed		—			—			13,632			(118	)		13,632		(118	)
	Asset-backed		—			—			24,898			(30	)		24,898		(30	)

		$	—			—		$	121,830		$	(439	)	$	121,830	$	(439	)



		12 Months or Greater						Less Than 12 Months						Total
	As at December 31, 2012	Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
	As at December 31, 2012	Value			Losses			Value			Losses			Value		Losses
	Non-U.S. government	$	2,646		$	(82	)	$	2,399		$	(69	)	$	5,045	$	(151	)
	Corporate		13,936			(86	)		8,689			(438	)		22,625		(524	)
	Residential mortgage-backed		1,124			(40	)		—			—			1,124		(40	)
	Asset-backed		174			(12	)		—			—			174		(12	)

		$	17,880		$	(220	)	$	11,088		$	(507	)	$	28,968	$	(727	)
Summary of Contractual Maturities of Company's Fixed Maturity Securities Classified as Available-for-Sale	'
	The contractual maturities of the Company’s fixed maturity securities and short-term investments classified as available-for-sale are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.


	As at December 31, 2013	Amortized			Fair			% of Total
	As at December 31, 2013	Cost			Value			Fair Value
	Due in one year or less	$	45,295		$	45,596			18.5	%
	Due after one year through five years		141,400			143,445			58.2	%
	Due after five years through ten years		69			70			0.1	%
	Due after ten years		2,671			3,428			1.4	%

			189,435			192,539			78.2	%
	Residential mortgage-backed		17,523			17,507			7.1	%
	Asset-backed		36,344			36,318			14.7	%

		$	243,302		$	246,364			100	%



	As at December 31, 2012	Amortized			Fair			% of Total
	As at December 31, 2012	Cost			Value			Fair Value
	Due in one year or less	$	173,113		$	173,949			69.3	%
	Due after one year through five years		64,089			68,298			27.2	%
	Due after ten years		3,074			3,560			1.4	%

			240,276			245,807			97.9	%
	Residential mortgage-backed		4,308			4,498			1.8	%
	Commercial mortgage-backed		474			481			0.2	%
	Asset-backed		338			335			0.1	%

		$	245,396		$	251,121			100	%
Credit Ratings Company's Fixed Maturity Securities and Short-term Investments Available-for-Sale	'
	The following tables set forth certain information regarding the credit ratings (provided by major rating agencies) of the Company’s fixed maturity securities and short-term investments classified as available-for-sale:


	As at December 31, 2013	Amortized			Fair			% of Total
	As at December 31, 2013	Cost			Value			Fair Value
	AAA	$	125,729		$	127,433			51.7	%
	AA		74,692			75,181			30.5	%
	A		33,834			34,607			14.1	%
	BBB or lower		8,957			8,963			3.6	%
	Not Rated		90			180			0.1	%

		$	243,302		$	246,364			100	%



	As at December 31, 2012	Amortized			Fair			% of Total
	As at December 31, 2012	Cost			Value			Fair Value
	AAA	$	107,615		$	110,829			44.1	%
	AA		59,535			60,742			24.2	%
	A		72,773			73,935			29.4	%
	BBB or lower		5,281			5,197			2.1	%
	Not Rated		192			418			0.2	%

		$	245,396		$	251,121			100	%
Other Investments	'
	The estimated fair values of the Company’s other investments were as follows:


		December 31,			December 31,
		2013			2012
	Private equity funds	$	161,229		$	127,696
	Fixed income funds		194,375			156,235
	Fixed income hedge funds		68,157			53,933
	Equity funds		109,355			55,881
	Real estate debt fund		32,113			16,179
	Other		4,064			4,921

		$	569,293		$	414,845

Summary of Fair Value, Unfunded Commitments and Redemption Frequency	'
	The following tables present the fair value, unfunded commitments and redemption frequency for all other investments. These investments are all valued at net asset value as at December 31, 2013 and December 31, 2012:


	December 31, 2013	Total Fair			Gated/Side			Investments			Unfunded			Redemption
		Value			Pocket			without Gates			Commitments			Frequency
					Investments			or Side Pockets
	Private equity funds	$	161,229		$	—		$	161,229		$	113,585		Not eligible
	Fixed income funds		194,375			—			194,375			—		Daily to monthly
	Fixed income hedge funds		68,157			3,150			65,007			—		Quarterly after lock-up periods expire
	Equity funds		109,355			—			109,355			—		Bi-monthly
	Real estate debt fund		32,113			—			32,113			—		Monthly
	Other		4,064			—			4,064			655		Not eligible

		$	569,293		$	3,150		$	566,143		$	114,240

	December 31, 2012	Total Fair			Gated/Side			Investments			Unfunded			Redemption
		Value			Pocket			without			Commitments			Frequency
					Investments			Gates or
								Side
								Pockets
	Private equity funds	$	127,696		$	—		$	127,696		$	86,936		Not eligible
	Fixed income funds		156,235			—			156,235			—		Daily to monthly
	Fixed income hedge funds		53,933			—			53,933			—		Quarterly after lock-up periods expire
	Equity fund		55,881			—			55,881			—		Bi-monthly
	Real estate debt fund		16,179			—			16,179			—		Monthly
	Other		4,921			—			4,921			655		Not eligible

		$	414,845		$	—		$	414,845		$	87,591

Categorized Investments Recorded at Fair Value among Levels	'
	In accordance with the provisions of the Fair Value Measurement and Disclosure topic of the FASB Accounting Standards Codification (“ASC”) 820, the Company has categorized its investments that are recorded at fair value among levels as follows:


		December 31, 2013
		Quoted Prices in			Significant			Significant			Total Fair
		Active Markets for			Other Observable			Unobservable			Value
		Identical Assets			Inputs			Inputs
		(Level 1)			(Level 2)			(Level 3)
	U.S. government and agency	$	—		$	468,289		$	—		$	468,289
	Non-U.S. government		—			562,516			—			562,516
	Corporate		—			2,200,970			609			2,201,579
	Municipal		—			41,034			—			41,034
	Residential mortgage-backed		—			235,964			—			235,964
	Commercial mortgage-backed		—			114,637			—			114,637
	Asset-backed		—			285,066			—			285,066
	Equities — U.S.		97,470			13,090			4,725			115,285
	Equities — International		35,677			31,071			—			66,748
	Other investments		—			303,724			265,569			569,293

	Total investments	$	133,147		$	4,256,361		$	270,903		$	4,660,411



		December 31, 2012
		Quoted Prices in			Significant			Significant			Total Fair
		Active Markets for			Other Observable			Unobservable			Value
		Identical Assets			Inputs			Inputs
		(Level 1)			(Level 2)			(Level 3)
	U.S. government and agency	$	—		$	366,863		$	—		$	366,863
	Non-U.S. government		—			389,578			—			389,578
	Corporate		—			1,715,330			540			1,715,870
	Municipal		—			20,446			—			20,446
	Residential mortgage-backed		—			120,092			—			120,092
	Commercial mortgage-backed		—			131,329			—			131,329
	Asset-backed		—			79,264			—			79,264
	Equities — U.S.		83,947			5,058			3,401			92,406
	Equities — International		10,377			11,805			—			22,182
	Other investments		—			212,115			202,730			414,845

	Total investments	$	94,324		$	3,051,880		$	206,671		$	3,352,875

Reconciliation of Beginning and Ending Balances for All Investments Measured at Fair Value on Recurring Basis	'
	The following table presents a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs during the twelve months ended December 31, 2013:


		Fixed			Other			Equity			Total
		Maturity			Investments			Securities
		Investments
	Level 3 investments as of January 1, 2013	$	540		$	202,730		$	3,401		$	206,671
	Purchases		—			44,032			—			44,032
	Sales		—			(28,568	)		—			(28,568	)
	Total realized and unrealized gains through earnings		69			47,375			1,324			48,768
	Net transfers into and/or (out of) Level 3		—			—			—			—

	Level 3 investments as of December 31, 2013	$	609		$	265,569		$	4,725		$	270,903

	The following table presents a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs during the year ended December 31, 2012:


		Fixed			Other			Equity			Total
		Maturity			Investments			Securities
		Investments
	Level 3 investments as of January 1, 2012	$	519		$	137,727		$	2,975		$	141,221
	Purchases		—			63,732			—			63,732
	Sales		—			(16,839	)		—			(16,839	)
	Total realized and unrealized gains through earnings		21			18,110			426			18,557
	Net transfers into and/or (out of) Level 3		—			—			—			—

	Level 3 investments as of December 31, 2012	$	540		$	202,730		$	3,401		$	206,671




Components of Net Realized and Unrealized Gains (Losses)	'
	Components of net realized and unrealized gains (losses) for the years ended December 31, 2013, 2012 and 2011 were as follows:


		2013			2012			2011
	Gross realized gains on available-for-sale securities	$	705		$	5,850		$	808
	Gross realized losses on available-for-sale securities		(214	)		(727	)		(471	)
	Net realized gains on trading securities		13,488			13,569			3,738
	Net unrealized (losses) gains on trading securities		(13,791	)		23,541			3,945
	Net realized and unrealized gains on other investments		70,463			31,379			1,194

	Net realized and unrealized gains	$	70,651		$	73,612		$	9,214

	Proceeds from sales and maturities of available-for-sale securities	$	196,507		$	353,913		$	445,052

Major Categories of Net Investment Income	'
	Major categories of net investment income for the years ended December 31, 2013, 2012 and 2011 are summarized as follows:


		2013			2012			2011
	Interest from fixed maturity investments	$	123,555		$	78,767		$	70,753
	Interest from cash and cash equivalents and short-term investments		13,705			14,924			13,232
	Net amortization of bond premiums and discounts		(51,505	)		(28,758	)		(25,245	)
	Dividends from equities		4,923			2,961			1,786
	Other investments		652			661			734
	Interest on other receivables		2,001			6,887			6,572
	Other income		2,999			5,229			3,118
	Interest on deposits held with clients		3,650			1,368			1,188
	Investment expenses		(6,685	)		(4,279	)		(3,462	)

		$	93,295		$	77,760		$	68,676

Schedule of Carrying Value of Restricted Investments	'
	The carrying value of the Company’s restricted assets, as of December 31, 2013 and December 31, 2012 was as follows:


		December 31			December 31,
		2013			2012
	Collateral in trust for third party agreements	$	2,002,374		$	570,391
	Assets on deposit with regulatory authorities		608,940			212,012
	Collateral for secured letter of credit facility		310,938			246,608

		$	2,922,252		$	1,029,011

Held-to-maturity Securities [Member]	'
Categorized Investments Recorded at Fair Value among Levels	'
	The following table presents the Company’s fair value hierarchy for those assets classified as held-to-maturity in the consolidated balance sheet but for which disclosure of the fair value is required as of December 31, 2013 (there were no assets classified as held-to-maturity as of December 31, 2012):


		December 31, 2013
		Quoted Prices in			Significant			Significant			Total Fair
		Active Markets for			Other Observable			Unobservable			Value
		Identical			Inputs			Inputs
		Assets			(Level 2)			(Level 3)
		(Level 1)
	U.S. government and agency	$	—		$	18,132		$	—		$	18,132
	Non-U.S. government		—			22,327			—			22,327
	Corporate		—			759,100			—			759,100

	Total investments	$	—		$	799,559		$	—		$	799,559

Derivative_Instruments_Tables

Derivative Instruments (Tables)	12 Months Ended
Derivative Instruments (Tables)	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Forward Contracts Outstanding, Estimated Fair Value, Change in Fair Value and Realized Gains of Derivative Instruments	'
	The following table sets forth the estimated fair value of derivative instruments recorded within other assets on the condensed consolidated balance sheet as at December 31, 2013 and 2012, and realized gains (losses) on derivative instruments recorded in net earnings for the years ended December 31, 2013, 2012 and 2011:


	Foreign Exchange	Contract Date		Settlement Date		Contract		Settlement		Fair Value as at			Net Foreign
	Forward Contract					Amount		Amount		December 31,			Exchange
													Gains (Losses)
	2013
	Australian dollar		November 26, 2013		January 3, 2014		AU$45,000		$41,036	$	779		$	779
	U.S. dollar		1-Jul-13		3-Jan-14		$40,887		AU$45,000		(630	)		(630	)
	Australian dollar		February 8, 2012		10-May-13		AU$45,000		$36,099		—			303
	British pound		6-Mar-12		6-Mar-13		UKP17,000		$26,611		—			1,023

										$	149		$	1,475

	2012
	Australian dollar		8-Feb-12		10-May-13		AU$35,000		$36,099	$	(238	)	$	(238	)
	British pound		6-Mar-12		6-Mar-13		UKP17,000		$26,611		(1,023	)		(1,023	)
	Australian dollar		8-Feb-12		December 19, 2012		AU$25,000		$26,165		—			—

										$	(1,261	)	$	(1,261	)

	2011
	U.S. dollar		September 22, 2011		2-Dec-11		$33,973		AU$35,000	$	—		$	3,008
	Australian dollar		23-Aug-11		2-Dec-11		AU$35,000		$36,981		—			—
	Australian dollar		12-Oct-10		30-Jun-11		AU$45,000		$42,476		—			(1,917	)

										$	—		$	1,091

Reinsurance_Balances_Recoverab1

Reinsurance Balances Recoverable (Tables)	12 Months Ended
Reinsurance Balances Recoverable (Tables)	Dec. 31, 2013
Insurance [Abstract]	'
Summary of Reinsurance Reserves Recoverable	'

		2013											2012
		Non-life			Active			Life		Total			Non-life			Active		Life		Total
		Run-off			Underwriting			Life		Total			Run-off			Underwriting		Life		Total
	Recoverable from reinsurers on:
	Outstanding losses	$	788,705		$	10,777		$	28,556	$	828,038		$	665,303		$	—	$	—	$	665,303
	Losses incurred but not reported		402,675			9,887			782		413,344			295,922			—		—		295,922
	Fair value adjustments		(69,847	)		4,391			—		(65,456	)		(85,005	)		—		—		(85,005	)

	Total reinsurance reserves recoverable		1,121,533			25,055			29,338		1,175,926			876,220			—		—		876,220
	Paid losses recoverable		177,459			7,845			2,589		187,893			246,408			—		291		246,699

		$	1,298,992		$	32,900		$	31,927	$	1,363,819		$	1,122,628		$	—	$	291	$	1,122,919

Reinsurance Balances Recoverable by Reinsurer	'
	Reinsurance balances recoverable by reinsurer were as follows:


		2013						2012
		Reinsurance			% of			Reinsurance		% of
		Recoverables			Total			Recoverables		Total
	Top 10 reinsurers	$	930,943			68.3	%	$	708,953		63.1	%
	Other reinsurers’ balances > $1 million		423,013			31	%		409,666		36.5	%
	Other reinsurers’ balances < $1 million		9,863			0.7	%		4,300		0.4	%

	Total	$	1,363,819			100	%	$	1,122,919		100	%

Losses_and_Loss_Adjustment_Exp1

Losses and Loss Adjustment Expenses (Tables)	12 Months Ended
Losses and Loss Adjustment Expenses (Tables)	Dec. 31, 2013
Losses and Loss Adjustment Expenses	'

			2013									2012
			Non-life			Active			Total			Non-life			Active			Total
			Run-off			Underwriting			Total			Run-off			Underwriting			Total
	Outstanding		$	2,541,934		$	79,826		$	2,621,760		$	2,358,329		$	—		$	2,358,329
	Incurred but not reported			1,717,870			98,583			1,816,453			1,588,310			—			1,588,310
	Fair value adjustment			(255,291	)		36,983			(218,308	)		(296,512	)		—			(296,512	)

			$	4,004,513		$	215,392		$	4,219,905		$	3,650,127		$	—		$	3,650,127

Non-Life Run-Off [Member]	'
Losses Incurred and Paid Reflected Net of Reinsurance Recoverables	'
	The tables below provide a reconciliation of the beginning and ending reserves for losses and loss adjustment expenses for the years ended December 31, 2013, 2012 and 2011, split between the non-life run-off segment and the active underwriting segment, was as follows (losses incurred and paid are reflected net of reinsurance recoverables):
	Non-Life Run-off Segment


			Non-Life Run-off
			2013			2012			2011
	Balance as at January 1⁽¹⁾		$	3,650,127		$	4,272,082		$	3,291,275
	Less: total reinsurance reserves recoverable			876,220			1,383,003			525,440

				2,773,907			2,889,079			2,765,835
	Net increase (reduction) in ultimate losses and loss adjustment expense liabilities:
	Current period			74,139			—			—
	Prior periods			(257,114	)		(237,953	)		(293,461	)

	Total net reduction in ultimate losses and loss adjustment expense liabilities			(182,975	)		(237,953	)		(293,461	)

	Net losses paid:
	Current period			(10,656	)		—			—
	Prior periods			(360,214	)		(314,528	)		(288,175	)

	Total net losses paid			(370,870	)		(314,528	)		(288,175	)

	Effect of exchange rate movement			4,936			14,833			(7,987	)
	Acquired on purchase of subsidiaries			557,476			—			600,046
	Assumed business			100,506			422,476			112,821

	Net balance as at December 31			2,882,980			2,773,907			2,889,079
	Plus: total reinsurance reserves recoverable			1,121,533			876,220			1,383,003

	Balance as at December 31		$	4,004,513		$	3,650,127		$	4,272,082


	-1	The Company reclassified $11.0 million of reserves acquired on the purchase of subsidiaries previously recorded in 2011 to policy benefits for life and annuity contracts. In addition, the Company has reclassified outstanding losses and loss adjustment expenses of $11.0 million and $10.8 million to policy benefits for life and annuity contracts as at January 1, 2013 and 2012, respectively, to conform to the current period presentation. These amounts are associated with Laguna, which now forms part of the Company’s life and annuities segment that was established following the acquisition of the Pavonia companies.
Net Reduction (Increase) in Ultimate Losses and Loss Adjustment Expense Liabilities	'
	The net reduction (increase) in ultimate losses and loss adjustment expense liabilities for the years ended December 31, 2013, 2012 and 2011 was as follows:


			Non-Life Run-off
			Years Ended December 31,
			2013									2012			2011
			Prior			Current			Total			Prior			Prior
			Period			Period			Total			Period			Period
	Net losses paid		$	360,214		$	10,656		$	370,870		$	314,528		$	288,175
	Net change in case and LAE reserves			(310,488	)		29,555			(280,933	)		(265,222	)		(311,614	)
	Net change in IBNR reserves			(265,206	)		33,928			(231,278	)		(267,422	)		(224,791	)

	(Reduction) increase in estimates of net ultimate losses			(215,480	)		74,139			(141,341	)		(218,116	)		(248,230	)
	Increase (reduction) in provisions for bad debt			1,999			—			1,999			(3,111	)		(42,822	)
	Reduction in provisions for unallocated loss adjustment expense liabilities			(49,580	)		—			(49,580	)		(39,298	)		(45,102	)
	Amortization of fair value adjustments			5,947			—			5,947			22,572			42,693

	Net (reduction) increase in ultimate losses and loss adjustment expense liabilities		$	(257,114	)	$	74,139		$	(182,975	)	$	(237,953	)	$	(293,461	)


	-1	For the years ended December 31, 2012 and 2011, the Company had no premium income and therefore no current period activity.
Active Underwriting [Member]	'
Losses Incurred and Paid Reflected Net of Reinsurance Recoverables	'

			2013
			Active
			Underwriting
	Balance as of January 1		$	—
	Less: total reinsurance reserves recoverable			—

				—
	Acquired on purchase of subsidiaries			200,374
	Net increase in ultimate losses and loss adjustment expenses incurred:
	Current period			19,303
	Net losses paid:
	Current period			(30,626	)
	Effect of exchange rate movement			1,286

	Net balance as of December 31			190,337
	Plus: total reinsurance reserves recoverable			25,055

	Balance as at December 31		$	215,392

Net Reduction (Increase) in Ultimate Losses and Loss Adjustment Expense Liabilities	'
	The net increase in ultimate losses and loss adjustment expense liabilities for the active underwriting segment for the year ended December 31, 2013 was as follows:


			Year Ended December 31, 2013
			Prior Period			Current Period			Total
	Net losses paid		$	—		$	30,626		$	30,626
	Net change in case and LAE reserves			—			(9,621	)		(9,621	)
	Net change in IBNR reserves			—			(1,653	)		(1,653	)

	Increase in estimates of net ultimate losses			—			19,352			19,352
	Reduction in provisions for unallocated loss adjustment expense liabilities			—			(49	)		(49	)

	Net increase in ultimate losses and loss adjustment expense liabilities		$	—		$	19,303		$	19,303

Policy_Benefits_for_Life_and_A1

Policy Benefits for Life and Annuity Contracts (Tables)	12 Months Ended
Policy Benefits for Life and Annuity Contracts (Tables)	Dec. 31, 2013
Investments All Other Investments [Abstract]	'
Schedule of Life and Annuity Benefits	'
	Policy benefits for life and annuity contracts as at December 31, 2013 and 2012 were as follows:


		2013			2012
	Life	$	380,874		$	11,027
	Annuities		963,323			—

			1,344,197			11,027
	Fair value adjustments		(71,097	)		—

		$	1,273,100		$	11,027

Premiums_Written_and_Earned_Ta

Premiums Written and Earned (Tables)	12 Months Ended
Premiums Written and Earned (Tables)	Dec. 31, 2013
Insurance [Abstract]	'
Schedule of Net Premiums Written and Earned	'
	The following tables provide a summary of net premiums written and earned in our non-life run-off, active underwriting and life and annuities segments for the years ended December 31, 2013, 2012 and 2011:


		2013						2012				2011
		Premiums			Premiums			Premiums		Premiums		Premiums		Premiums
		Written			Earned			Written		Earned		Written		Earned
	Non-life run-off
	Direct	$	17,250		$	121,986		$	—	$	—	$	—	$	—
	Assumed		(3,084	)		2,276			—		—		—		—
	Ceded		(4,933	)		(11,651	)		—		—		—		—

	Net	$	9,233		$	112,611		$	—	$	—	$	—	$	—

	Active underwriting
	Direct		10,214			12,416		$	—	$	—	$	—	$	—
	Assumed		19,890			19,796			—		—		—		—
	Ceded		—			—			—		—		—		—

	Net	$	30,104		$	32,212		$	—	$	—	$	—	$	—

	Life and annuities
	Life	$	63,856		$	94,984		$	3,511	$	3,511	$	3,543	$	3,543

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill and Intangible Assets	'
	The following tables show the Company’s goodwill and intangible assets as at December 31, 2013 and 2012:


	2013		Goodwill			Intangible assets with			Intangible assets with			Total			Intangible assets with
	2013		Goodwill			a definite life-Other			an indefinite life			Total			a definite life-FVA
	Balance as at January 1, 2013		$	21,222		$	—		$	—		$	21,222		$	211,507
	Acquired during the year			38,848			27,000			63,000			128,848			33,623
	Intangible assets amortization			—			—			—			—			(21,183	)

	Balance as at December 31, 2013		$	60,070		$	27,000		$	63,000		$	150,070		$	223,947

	2012		Goodwill			Intangible			Intangible			Total			Intangible assets
						assets			assets						with a
						with a			with an						definite life-FVA
						definite			indefinite
						life-Other			life
	Balance as at January 1, 2012		$	21,222		$	—		$	—		$	21,222		$	243,904
	Acquired during the year			—			—			—			—			(9,825	)
	Intangible assets amortization			—			—			—			—			(22,572	)

	Balance as at December 31, 2012		$	21,222		$	—		$	—		$	21,222		$	211,507

	Intangible assets with a definite life include:

		(i)	Fair value adjustments (“FVA”) relate to outstanding losses and loss adjustment expenses, policy benefits for life and annuity contracts and reinsurance recoverables and are included as a component of each balance sheet line item. FVA are amortized in proportion to future premiums for policy benefits for life and annuity contracts and over the estimated payout or recovery period for outstanding losses and loss adjustment expenses and reinsurance recoverables; and

		(ii)	Other intangible assets relate to the values associated with the distribution channel and brand related to the Company’s acquisition of Atrium. These assets will be amortized on a straight-line basis a over a period of ten to fifteen years.
Summary of Gross Carrying Value, Accumulated Amortization and Net Carrying Value of Intangible Assets	'
	The gross carrying value, accumulated amortization and net carrying value of intangible assets by type at December 31, 2013 and 2012 were as follows:


			2013									2012
			Gross Carrying			Accumulated			Net Carrying			Gross Carrying			Accumulated			Net Carrying
			Value			Amortization			Value			Value			Amortization			Value
	Intangible assets with a definite life:
	Fair value adjustments:
	Losses and loss adjustment expense		$	500,485		$	(282,178	)	$	218,307		$	552,455		$	(255,943	)	$	296,512
	Reinsurance balances recoverable			(179,116	)		113,659			(65,457	)		(178,377	)		93,372			(85,005	)
	Policy benefits for life and annuity contracts			86,332			(15,235	)		71,097			—			—			—

	Total			407,701			(183,754	)		223,947			374,078			(162,571	)		211,507
	Other::
	Distribution channel			20,000			—			20,000			—			—			—
	Brand			7,000			—			7,000			—			—			—

	Total			27,000			—			27,000			—			—			—

	Total intangible assets with a definite life			434,701			(183,754	)		250,947			374,078			(162,571	)		211,507
	Intangible assets with an indefinite life:
	Lloyd’s syndicate capacity			32,900			—			32,900			—			—			—
	Management contract			30,100			—			30,100			—			—			—

	Total intangible assets		$	497,701		$	(183,754	)	$	313,947		$	374,078		$	(162,571	)	$	211,507

Summary of Estimated Amortization Expense of Intangible Assets	'
	The estimated amortization expense for each of the five succeeding fiscal years related to the Company’s intangible assets with a definite life for each segment is as follows:


	Year		Non-life			Active			Life and			Total
	Year		Run-off			Underwriting			Annuities			Total
	2014		$	23,485		$	(5,693	)	$	9,271		$	27,063
	2015			19,246			(5,626	)		8,249			21,869
	2016			16,376			(3,384	)		7,373			20,365
	2017			14,569			(1,779	)		6,862			19,652
	2018			12,940			(573	)		6,132			18,499

	Total		$	86,616		$	(17,055	)	$	37,887		$	107,448

Loans_Payable_Tables

Loans Payable (Tables)

12 Months Ended

Dec. 31, 2013

Text Block [Abstract]

Amounts of Loans Payable Outstanding

Amounts of loans payable outstanding, and accrued interest, as of December 31, 2013 and 2012 total $452.4 million and $107.4 million, respectively, and comprise:

Facility

Date of Facility

Facility

December 31,

Term

2013

2012

EGL Revolving Credit Facility

July 8, 2013

5 Years

258,800

—

SeaBright Facility

December 21, 2012

3 Years

111,000

—

Clarendon Facility

12-Jul-11

4 Years

78,995

106,500

448,795

106,500

Accrued interest

3,651

930

Total loans payable

452,446

107,430

Redeemable_Noncontrolling_Inte1

Redeemable Noncontrolling Interest (Tables)	12 Months Ended
Redeemable Noncontrolling Interest (Tables)	Dec. 31, 2013
Noncontrolling Interest [Abstract]	'
Carrying Amount of Equity Attributable to Noncontrolling Interest	'
	A reconciliation of the beginning and ending carrying amount of the equity attributable to the redeemable noncontrolling interest is as follows:


		Redeemable
		noncontrolling
		interest
	Balance as at December 31, 2012	$	—
	Redeemable noncontrolling interest, initial contributions		96,689
	Net earnings attributable to redeemable noncontrolling interest		4,170

	Balance as at December 31, 2013	$	100,859

Share_Capital_Tables

Share Capital (Tables)	12 Months Ended
Share Capital (Tables)	Dec. 31, 2013
Equity [Abstract]	'
Summary of Changes in Voting Ordinary Shares	'
	Issued and fully paid Voting Ordinary Shares of par value $1.00 each:


		2013		2012
	Balance, beginning of year	$	13,752	$	13,665
	Issue of shares		6		43
	Share awards granted/vested		45		44

	Balance, end of year	$	13,803	$	13,752

Summary of Changes in Non-Voting Convertible Ordinary Shares	'
	Issued and fully paid Series A non-voting convertible ordinary shares of par value $1.00 each:


		2013		2012
	Balance, beginning and end of year	$	2,973	$	2,973

	Issued and fully paid Series C non-voting convertible ordinary shares of par value $1.00 each:


		2013		2012
	Balance, beginning and end of year	$	2,726	$	2,726

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
Earnings Per Share (Tables)	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Comparison of Basic and Diluted Earnings Per Share	'
	The following table sets forth the comparison of basic and diluted earnings per share for the years ended December 31, 2013, 2012 and 2011:


		2013		2012		2011
	Basic earnings per ordinary share:
	Net earnings attributable to Enstar Group Limited	$	208,604	$	168,017	$	153,693
	Weighted average ordinary shares outstanding — basic		16,523,369		16,441,461		13,930,221

	Net earnings per ordinary share attributable to Enstar Group Limited — basic	$	12.62	$	10.22	$	11.03

	Diluted earnings per ordinary share:
	Net earnings attributable to Enstar Group Limited	$	208,604	$	168,017	$	153,693
	Weighted average ordinary shares outstanding — basic		16,523,369		16,441,461		13,930,221
	Share equivalents:
	Unvested shares		117,850		162,454		196,670
	Restricted share units		18,056		19,478		69,723
	Warrants		44,167		—		—
	Options		—		14,628		15,826

	Weighted average ordinary shares outstanding — diluted		16,703,442		16,638,021		14,212,440

	Net earnings per ordinary share attributable to Enstar Group Limited — diluted	$	12.49	$	10.1	$	10.81

Employee_Benefits_Tables

Employee Benefits (Tables)	12 Months Ended
Employee Benefits (Tables)	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Components of Salaries and Benefits	'
	Components of salaries and benefits are summarized as follows:


		2013			2012		2011
	Salaries and benefits	$	83,563		$	63,689	$	55,642
	Defined contribution pension plan expense		6,023			4,240		4,864
	2006 equity plan		2,923			2,894		2,662
	Annual incentive plan		32,107			29,650		26,678

	Total salaries and benefits	$	124,616		$	100,473	$	89,846


Employee Share Awards	'
	Employee share awards are summarized as follows:


		2013					2012					2011
		Number of			Weighted		Number of			Weighted		Number of			Weighted
		Shares			Average		Shares			Average		Shares			Average
					Fair					Fair					Fair
					Value of					Value of					Value of
					the Award					the Award					the Award
	Nonvested — January 1		160,644		$	17,989		203,930		$	20,026		153,930		$	13,019
	Granted		4,959			557		5,633			472		71,621			5,957
	Vested		(50,444	)		5,855		(48,919	)		4,736		(21,621	)		1,907

	Nonvested — December 31		115,159		$	15,997		160,644		$	17,989		203,930		$	20,026

Taxation_Tables

Taxation (Tables)	12 Months Ended
Taxation (Tables)	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Earnings before Income Taxes	'
	Earnings before income taxes includes the following components:


		2013			2012			2011
	Domestic (Bermuda)	$	193,063		$	30,839		$	44,983
	Foreign		66,378			204,970			188,759

	Total	$	259,441		$	235,809		$	233,742

Tax Expense (Benefit) for Income Taxes	'
	Tax expense (benefit) for income taxes is comprised of:


		2013			2012			2011
	Current:
	Domestic (Bermuda)	$	—		$	—		$	—
	Foreign		30,787			34,704			28,924

			30,787			34,704			28,924

	Deferred:
	Domestic (Bermuda)		—			—			—
	Foreign		4,832			9,586			(3,640	)

			4,832			9,586			(3,640	)

	Total tax expense	$	35,619		$	44,290		$	25,284

Reconciliation of Earnings before Income Taxes Computed by Applying Effective Rate	'
	The actual income tax rate differed from the amount computed by applying the effective rate of 0% under Bermuda law to earnings before income taxes as shown in the following reconciliation:


		2013			2012			2011
	Earnings before income tax	$	259,441		$	235,809		$	233,742

	Expected tax rate		—	%		—	%		—	%
	Foreign taxes at local expected rates		5.1	%		20.8	%		19.2	%
	Change in uncertain tax positions		(1.0	)%		0.1	%		—	%
	Change in valuation allowance		7.2	%		(3.0	)%		(8.4	)%
	Impact of Australian tax consolidation		—	%		—	%		0.8	%
	Other		2.4	%		0.9	%		(0.8	)%

	Effective tax rate		13.7	%		18.8	%		10.8	%

Components of Deferred Tax Assets and Deferred Tax Liabilities	'

	The temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented in the table below:



		As of December 31,
		2013			2012
	Deferred tax assets
	Benefit of losses, deductions, and other carryforwards	$	187,377		$	162,389
	Claims reserves, principally due to discounting for tax		217,283			27,195
	Allowance for doubtful accounts receivable		22,303			16,703
	Investments		—			7,552

			426,963			213,839

	Deferred tax liabilities
	Investments		(31,932	)		(11,999	)
	Unrecognized income		(21,740	)		—
	Intangible asset from acquisition		(18,000	)		—
	Other		(5,424	)		—

	Net deferred tax asset before valuation allowance		349,867			201,840
	Valuation allowance		(366,650	)		(202,365	)

	Net deferred tax liability	$	(16,783	)	$	(525	)

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


		2013			2012			2011
	Balance, beginning of year	$	5,821		$	5,621		$	5,566
	Gross increases — tax positions related to prior years		114			221			161
	Gross decreases — tax positions related to prior years		(3,346	)		(12	)		—
	Lapse of statute of limitations		(340	)		(9	)		(106	)

	Balance, end of year	$	2,249		$	5,821		$	5,621

Retained_Earnings_and_Statutor1

Retained Earnings and Statutory Restrictions (Tables)	12 Months Ended
Retained Earnings and Statutory Restrictions (Tables)	Dec. 31, 2013
Text Block [Abstract]	'
Summary of Statutory Capital and Surplus	'
	The statutory capital and surplus amounts for the years ended December 31, 2013 and 2012 and statutory net income (loss) amounts for the years ended December 31, 2013, 2012 and 2011 for the Company’s insurance and reinsurance subsidiaries based in Bermuda, the United Kingdom, Australia, the United States and Europe were as follows:


		Statutory Capital and Surplus
		Minimum Required				Actual				Statutory Income (Loss)
		2013		2012		2013		2012		2013		2012			2011
	Bermuda	$	109,010	$	92,606	$	833,263	$	627,335	$	103,852	$	98,247		$	80,022
	U.K.	$	83,410	$	80,324	$	592,992	$	506,459	$	76,685	$	64,015		$	114,403
	Australia	$	65,894	$	82,007	$	99,174	$	94,042	$	19,131	$	4,651		$	13,979
	U.S.	$	138,331	$	102,114	$	879,947	$	445,818	$	4,725	$	(42,109	)	$	(8,234	)
	Europe	$	12,965	$	38,642	$	142,216	$	173,974	$	11,035	$	7,578		$	22,356

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments on Non-Cancellable Leases	'
	The following is a schedule of future minimum rental payments on non-cancellable leases as of December 31, 2013:


	2013	$	5,912
	2014		4,781
	2015		2,759
	2016		585
	2017		406
	2018		309

		$	14,752

Summary of Company's Outstanding Unfunded Investment Commitments	'
	The following table provides a summary of the Company’s outstanding unfunded investment commitments for the years ended December 31, 2013 and 2012:


	December 31, 2013				December 31, 2012
	Original	Commitments			Original	Commitments
	Commitments	Funded		Unfunded	Commitments	Funded	Unfunded
	$291,000	$176,760		$114,240	$251,000	$163,409	$87,591

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
Segment Information (Tables)	Dec. 31, 2013
Segment Reporting [Abstract]	'
Summary of Company's Assets by Segment	'
	The Company’s total assets by segment were:


			December 31, 2013				December 31, 2012
	Total assets — non-life run-off		$	6,619,992			$	5,825,402
	Total assets — life and annuities			1,414,987				52,859
	Total assets — active underwriting			585,176				—

			$	8,620,155			$	5,878,261

Summary of Operations by Segment	'
	The following tables set forth selected and consolidated statement of earnings results by segment for the years ended December 31, 2013, 2012, 2011:


			December 31, 2013
			Non-life				Life and				Active				Eliminations			Consolidated
			run-off				annuities				underwriting				Eliminations			Consolidated
	Net premiums earned		$	112,611			$	94,984			$	32,212			$	—		$	239,807
	Fees and commission income			12,785				—				2,708				(2,676	)		12,817
	Net investment income			64,048				30,182				521				(1,456	)		93,295
	Net realized and unrealized gains (losses)			79,368				(9,259	)			542				—			70,651

				268,812				115,907				35,983				(4,132	)		416,570

	EXPENSES
	Net reduction in ultimate losses and loss adjustment expense liabilities:
	Losses incurred on current period premiums			74,139				—				—				—			74,139
	earned — non-life run-off			74,139				—				—				—			74,139
	Losses incurred — active underwriting			—				—				19,352				—			19,352
	Reduction in estimates of net ultimate losses			(215,480	)			—				—				—			(215,480	)
	Increase in provisions for bad debt			1,999				—				—				—			1,999
	Reduction in provisions for unallocated loss adjustment expense liabilities			(49,580	)			—				(49	)			—			(49,629	)
	Amortization of fair value adjustments			5,947				—				—				—			5,947

				(182,975	)			—				19,303				—			(163,672	)
	Life and annuity policy benefits			—				78,354				—				—			78,354
	Acquisition costs			14,379				8,820				—				—			23,199
	Salaries and benefits			117,141				4,799				2,676				—			124,616
	General and administrative expenses			67,979				16,039				5,270				(2,676	)		86,612
	Interest expense			12,057				1,456				332				(1,456	)		12,389
	Net foreign exchange (gains) losses			(5,909	)			158				1,382				—			(4,369	)

				22,672				109,626				28,963				(4,132	)		157,129

	EARNINGS BEFORE INCOME TAXES			246,140				6,281				7,020				—			259,441
	INCOME TAXES			(34,191	)			(1,243	)			(185	)			—			(35,619	)

	NET EARNINGS			211,949				5,038				6,835				—			223,822
	Less: Net earnings attributable to noncontrolling interest			(12,076	)			—				(3,142	)			—			(15,218	)

	NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	199,873			$	5,038			$	3,693			$	—		$	208,604



			December 31, 2012
			Non-life				Life and				Eliminations				Consolidated
			run-off				annuities				Eliminations				Consolidated
	Net premiums earned		$	—			$	3,511			$	—			$	3,511
	Fees and commission income			9,283				—				(713	)			8,570
	Net investment income			76,813				947				—				77,760
	Net realized and unrealized gains			71,730				1,882				—				73,612

				157,826				6,340				(713	)			163,453

	EXPENSES
	Net reduction in ultimate losses and loss adjustment expense liabilities:
	Reduction in estimates of net ultimate losses			(218,116	)			—				—				(218,116	)
	Reduction in provisions for bad debt			(3,111	)			—				—				(3,111	)
	Reduction in provisions for unallocated loss adjustment expense liabilities			(39,298	)			—				—				(39,298	)
	Amortization of fair value adjustments			22,572				—				—				22,572

				(237,953	)			—				—				(237,953	)
	Life and annuity policy benefits			—				(300	)			—				(300	)
	Salaries and benefits			99,342				1,131				—				100,473
General and administrative expenses			55,731				1,574				(713	)			56,592
Interest expense			8,426				—				—				8,426
Net foreign exchange losses (gains)			644				(238	)			—				406

			(73,810	)			2,167				(713	)			(72,356	)

EARNINGS BEFORE INCOME TAXES			231,636				4,173				—				235,809
INCOME TAXES			(44,266	)			(24	)			—				(44,290	)

NET EARNINGS			187,370				4,149				—				191,519
Less: Net earnings attributable to noncontrolling interest			(23,502	)			—				—				(23,502	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	163,868			$	4,149			$	—			$	168,017



		December 31, 2011
		Non-life				Life and				Consolidated
		run-off				annuities				Consolidated
Net premiums earned		$	—			$	3,543			$	3,543
Fees and commission income			17,858				—				17,858
Net investment income			66,556				2,120				68,676
Net realized and unrealized gains			8,553				661				9,214
Gain on bargain purchase			—				13,105				13,105

			92,967				19,429				112,396

EXPENSES
Net reduction in ultimate losses and loss adjustment expense liabilities:
Reduction in estimates of net ultimate losses			(248,230	)			—				(248,230	)
Reduction in provisions for bad debt			(42,822	)			—				(42,822	)
Reduction in provisions for unallocated loss adjustment expense liabilities			(45,102	)			—				(45,102	)
Amortization of fair value adjustments			42,693				—				42,693

			(293,461	)			—				(293,461	)
Life and annuity policy benefits			—				1,557				1,557
Salaries and benefits			89,440				406				89,846
General and administrative expenses			70,841				969				71,810
Interest expense			8,529				—				8,529
Net foreign exchange losses (gains)			1,190				(817	)			373

			(123,461	)			2,115				(121,346	)

EARNINGS BEFORE INCOME TAXES			216,428				17,314				233,742
INCOME TAXES			(25,311	)			27				(25,284	)

NET EARNINGS			191,117				17,341				208,458
Less: Net earnings attributable to noncontrolling interest			(54,765	)			—				(54,765	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	136,352			$	17,341			$	153,693

Condensed_Unaudited_Quarterly_1

Condensed Unaudited Quarterly Financial Data (Tables)	12 Months Ended
Condensed Unaudited Quarterly Financial Data (Tables)	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Condensed Unaudited Quarterly Financial Data	'

			2013 Quarters Ended
			December 31				September 30				June 30				March 31
	Net premiums earned — non-life run-off		$	12,341			$	28,134			$	41,216			$	30,920
	Net premiums earned — life and annuities			29,323				30,540				34,380				741
	Net premiums earned — active underwriting			32,212				—				—				—
	Fees and commission income			5,012				2,398				2,960				2,447
	Net investment income			23,071				25,009				27,252				17,963
	Net realized and unrealized gains (losses)			31,440				37,010				(27,919	)			30,120

				133,399				123,091				77,889				82,191

	Net (reduction) increase in ultimate losses and loss adjustment expense liabilities:
	Losses incurred on current period premiums earned —non-life run-off			(14,153	)			24,236				35,523				28,533
	Losses incurred — active underwriting			19,352				—				—				—
	Reduction in estimates of net ultimate losses			(134,068	)			(27,850	)			(48,500	)			(5,062	)
	Increase (reduction) in provisions for bad debt			7,464				(5,465	)			—				—
	Reduction in provisions for unallocated loss and loss adjustment expense liabilities			(111	)			(16,320	)			(16,795	)			(16,403	)
	Amortization of fair value adjustments			(3,540	)			5,025				2,369				2,093

				(125,056	)			(20,374	)			(27,403	)			9,161
	Life and annuity policy benefits			20,970				31,081				25,562				741
	Acquisition costs			5,050				6,149				9,613				2,387
	Salaries and benefits			45,603				29,716				25,687				23,610
	General and administrative expenses			19,538				29,126				20,002				17,946
	Interest expense			3,593				3,270				3,091				2,435
	Net foreign exchange (gains) losses			(375	)			(673	)			(8,403	)			5,082

				(22,677	)			78,295				48,149				61,362

	EARNINGS BEFORE INCOME TAXES			164,076				44,796				29,740				20,829
	INCOME TAXES			(21,893	)			(1,340	)			(4,542	)			(7,844	)

	NET EARNINGS			142,183				43,456				25,198				12,985
	Less: Netearnings attributable to noncontrolling interest			(4,722	)			(3,469	)			(6,001	)			(1,026	)

	NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	137,461			$	39,987			$	19,197			$	11,959

	EARNINGS PER SHARE — BASIC:
	Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.32			$	2.42			$	1.16			$	0.72

	EARNINGS PER SHARE — DILUTED:
	Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.23			$	2.39			$	1.15			$	0.72



			2012 Quarters Ended
			December 31				September 30				June 30				March 31
	Net premiums earned — life and annuities		$	819			$	822			$	896			$	974
	Fees and commission income			2,657				1,944				1,775				2,194
	Net investment income			16,765				19,658				20,894				20,443
	Net realized and unrealized gains			18,259				28,280				1,691				25,382

				38,500				50,704				25,256				48,993

	Net reduction in ultimate losses and loss adjustment expense liabilities:
	Reduction in estimates of net ultimate losses			(97,895	)			(58,506	)			(58,417	)			(3,298	)
	Reduction in provisions for bad debt			(329	)			—				(527	)			(2,255	)
	Reduction in provisions for unallocated loss adjustment expense liabilities			(2,206	)			(12,579	)			(11,661	)			(12,852	)
	Amortization of fair value adjustments			4,207				8,538				2,240				7,587

				(96,223	)			(62,547	)			(68,365	)			(10,818	)
	Life and annuity policy benefits			(2,992	)			822				896				974
Salaries and benefits			30,505				25,138				24,379				20,451
General and administrative expenses			13,169				14,409				14,156				14,858
Interest expense			2,540				1,713				2,062				2,111
Net foreign exchange (gains) losses			(2,212	)			977				(627	)			2,268

			(55,213	)			(19,488	)			(27,499	)			29,844

EARNINGS BEFORE INCOME TAXES			93,713				70,192				52,755				19,149
INCOME TAXES			(13,943	)			(14,700	)			(11,905	)			(3,742	)

NET EARNINGS			79,770				55,492				40,850				15,407
Less: Netearnings attributable to noncontrolling interest			(9,864	)			(7,776	)			(129	)			(5,733	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	69,906			$	47,716			$	40,721			$	9,674

EARNINGS PER SHARE — BASIC:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	4.25			$	2.9			$	2.48			$	0.59

EARNINGS PER SHARE — DILUTED:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	4.22			$	2.86			$	2.44			$	0.58



		2011 Quarters Ended
		December 31				September 30				June 30				March 31
Net premiums earned — life and annuities		$	1,080			$	1,192			$	1,271			$	—
Fees and commission income			10,154				1,623				2,045				4,036
Net investment income			15,571				18,498				19,059				15,548
Net realized and unrealized gains (losses)			2,231				(8,512	)			9,133				6,362
Gain on bargain purchase			—				—				—				13,105

			29,036				12,801				31,508				39,051

Net reduction in ultimate losses and loss adjustment expense liabilities:
Reduction in estimates of net ultimate losses			(173,924	)			(43,615	)			(28,079	)			(2,612	)
Reduction in provisions for bad debt			(38,751	)			(2,399	)			(1,672	)			—
Reduction in provisions for unallocated loss adjustment expense liabilities			(7,669	)			(14,113	)			(11,783	)			(11,537	)
Amortization of fair value adjustments			16,782				8,865				6,969				10,077

			(203,562	)			(51,262	)			(34,565	)			(4,072	)
Life and annuity policy benefits			(2,304	)			2,340				1,521				—
Salaries and benefits			41,818				20,923				16,723				10,382
General and administrative expenses			5,090				20,759				28,211				17,750
Interest expense			2,431				2,435				1,697				1,966
Net foreign exchange (gains) losses			(15	)			(8,878	)			1,932				7,334

			(156,542	)			(13,683	)			15,519				33,360

EARNINGS BEFORE INCOME TAXES			185,578				26,484				15,989				5,691
INCOME TAXES			(19,256	)			(4,436	)			(975	)			(617	)

NET EARNINGS			166,322				22,048				15,014				5,074
Less: Netearnings attributable to noncontrolling interest			(37,571	)			(9,984	)			(5,639	)			(1,571	)

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED		$	128,751			$	12,064			$	9,375			$	3,503

EARNINGS PER SHARE — BASIC:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.89			$	0.85			$	0.67			$	0.27

EARNINGS PER SHARE — DILUTED:
Net earnings per ordinary share attributable to Enstar Group Limited shareholders		$	8.71			$	0.83			$	0.66			$	0.26

Significant_Accounting_Policie2

Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Impairment of goodwill	$0
Maturity period to consider securities as short-term investments	'Greater than three months but less than one year
Maturity period to consider securities as fixed maturities	'One year and greater

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail)

3 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

11 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

11 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jul. 08, 2013

Dec. 31, 2013

Nov. 25, 2013

Sep. 09, 2013

Dec. 31, 2013

Nov. 25, 2013

Sep. 09, 2013

Dec. 31, 2013

Jul. 12, 2011

Dec. 31, 2013

Jul. 12, 2011

Mar. 25, 2011

Dec. 31, 2013

Feb. 07, 2013

Dec. 31, 2013

USD ($)

Veranda Holdings Ltd [Member]

Bayshore Holdings Ltd [Member]

First Reserve [Member]

Trident [Member]

Torus Insurance Holdings Limited [Member]

Atrium [Member]

Arden [Member]

Pavonia [Member]

Clarendon [Member]

Laguna [Member]

SeaBright [Member]

Corsair [Member]

USD ($)

Share Capital - Ordinary Shares [Member]

Non-Voting Preferred Shares [Member]

Veranda Holdings Ltd [Member]

Bayshore Holdings Ltd [Member]

Trident [Member]

Kenmare [Member]

USD ($)

Lloyd's Syndicate [Member]

Kenmare [Member]

USD ($)

Trident [Member]

Kenmare [Member]

USD ($)

New Jersey [Member]

Florida [Member]

Hannover [Member]

USD ($)

EUR (€)

USD ($)

Bayshore Holdings Ltd [Member]

USD ($)

Insurers

USD ($)

Non-Voting Preferred Shares [Member]

Business Acquisition [Line Items]

Percentage of interest indirectly owned

60.00%

40.00%

60.00%

Purchase price

$692,000,000

$119,152,000

$79,600,000

$155,564,000

$219,100,000

$219,077,000

$34,328,000

$252,091,000

Ordinary shares, shares issued

2,612,346

Ordinary shares, par value

$132.45

Preference shares, par value

Value of equity issued, Business combination

69,200,000

276,800,000

Interest owned by an entity

40.00%

60.00%

100.00%

Average closing price of voting ordinary shares prior to trading period

'20 days

Amalgamation effect on first reserve

'In the event that the number of Voting Ordinary Shares deliverable to First Reserve at the closing of the Amalgamation would cause First Reserve, as of immediately after such closing, to beneficially own Voting Ordinary Shares that constitute more than 9.5% of the voting power of all shares of the Company, then the Company will issue to First Reserve, at the closing, the total number of shares of Voting Ordinary Shares representing 9.5% of the voting power of all shares of the Company as of immediately after the closing and Non-Voting Preferred Shares representing the remainder of the shares that First Reserve is entitled to under the Amalgamation Agreement.

Ownership percentage of ordinary shares

9.50%

2.50%

Ownership percentage of outstanding share capital

11.50%

2.10%

Ownership percentage of ordinary shares

75.00%

Number of days to file resale shelf registration statement for the Registrable Securities

'20 days

Interest owned by an entity

55.00%

Percentage of Company's ordinary shares acquired

9.70%

Acquisition purchase price

158,000,000

94,800,000

79,600,000

47,800,000

155,564,000

219,077,000

21,223,000

252,091,000

Goodwill recognized

60,070,000

21,222,000

60,070,000

21,222,000

38,848,000

Indefinite lived intangible assets recognized

63,000,000

Other intangible assets recognized

27,000,000

Unearned premiums fair value adjustment

16,700,000

14,400,000

Percentage of premium income from license

25.00%

Earned premiums

10,700,000

21,300,000

92,200,000

112,800,000

Losses incurred on current period premiums earned

-74,139,000

7,200,000

11,800,000

86,600,000

Net premium gain

142,183,000

43,456,000

25,198,000

12,985,000

79,770,000

55,492,000

40,850,000

15,407,000

166,322,000

22,048,000

15,014,000

5,074,000

223,822,000

191,519,000

208,458,000

2,500,000

9,800,000

3,700,000

3,500,000

Number of Insurers

Aggregate cash purchase price

155,600,000

21,200,000

15,000,000

252,100,000

Purchase price financed

55,700,000

106,500,000

111,000,000

Recorded life and annuity benefits and acquisition costs

20,970,000

31,081,000

25,562,000

741,000

-2,992,000

822,000

896,000

974,000

-2,304,000

2,340,000

1,521,000

78,354,000

-300,000

1,557,000

88,600,000

Period of term loan facility

'4 years

Gross premiums written

17,800,000

Net premiums written

9,200,000

Amount of parental guarantee provided by the Company

80,000,000

Original purchase price

42,400,000

30,000,000

Distribution of balance amount to shareholders

21,200,000

15,000,000

Gain on bargain purchase

$13,105,000

Acquisitions_Purchase_Price_an

Acquisitions - Purchase Price and Fair Value of Assets Acquired (Detail) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Mar. 25, 2011

Dec. 31, 2013

Jul. 12, 2011

Arden [Member]

Atrium [Member]

SeaBright [Member]

Laguna [Member]

Pavonia [Member]

Clarendon [Member]

Business Acquisition [Line Items]

Purchase price

$79,600

$158,000

$252,091

$21,223

$155,564

$219,077

Net assets acquired at fair value

79,600

119,152

252,091

34,328

155,564

219,077

219,100

Excess of purchase price over fair value of net assets acquired

21,222

60,070

21,222

38,848

Excess of net assets over purchase price (gain on bargain purchase)

($13,105)

Acquisitions_Summary_of_Estima

Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed as of Date of Acquisition (Detail) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Jul. 12, 2011

Dec. 31, 2013

In Thousands, unless otherwise specified

Pavonia [Member]

SeaBright [Member]

Clarendon [Member]

Laguna [Member]

Atrium [Member]

Arden [Member]

Active Underwriting [Member]

Non-Life Run-Off [Member]

ASSETS

Short-term investments, available-for-sale, at fair value

$33,535

Short-term investments, trading, at fair value

40,404

25,171

60,376

1,154

12,526

28,852

16,340

12,512

Fixed maturities, available-for-sale, at fair value

156,142

Short-term investments, held-to-maturity, at fair value

10,268

Fixed maturities, trading, at fair value

329,985

683,780

623,530

30,765

10,751

55,428

9,351

46,077

Fixed maturities, held-to-maturity, at fair value

876,474

Other investments

2,867

Equities

5,014

Total investments

1,257,131

708,951

688,920

31,919

212,954

87,147

25,691

61,456

Cash and cash equivalents

81,849

41,846

138,518

13,274

44,842

23,037

Restricted cash and cash equivalents

7,198

12,305

31,812

10,213

21,599

Accrued interest and other receivables

15,183

6,344

9,655

Funds held by reinsured companies

47,761

Premiums receivable

112,510

41,855

124,221

74,452

49,769

Reinsurance balances recoverable

117,462

1,065,341

1,459

32,375

354,810

Deferred premium

26,224

Funds withheld

19,579

Intangibles

90,000

Other assets

59,002

4,515

1,325

7,977

12,016

TOTAL ASSETS

1,460,926

991,628

1,909,632

47,977

488,111

633,043

110,356

522,687

LIABILITIES

Losses and loss adjustment expenses

592,774

1,654,436

11,898

216,319

483,727

56,160

427,567

Policyholder benefits for life and annuity contracts

1,255,632

Insurance and reinsurance balances payable

1,942

20,834

59,304

Reinsurance balances payable

39,477

Funds withheld

26,277

Accounts payable

7,900

1,751

Unearned premium

5,618

93,897

42,738

10,412

Deferred taxes

39,740

Loans payable

12,000

Insurance balances payable

3,243

Other liabilities

4,635

37,623

49,328

TOTAL LIABILITIES

1,305,362

739,537

1,690,555

13,649

368,959

553,443

56,160

497,283

NET ASSETS ACQUIRED AT FAIR VALUE

155,564

252,091

219,077

219,100

34,328

119,152

79,600

54,196

25,404

Goodwill

60,070

21,222

38,848

ACQUISITION DATE FAIR VALUE

$158,000

Acquisitions_Summary_of_Provis

Acquisitions - Summary of Provisional Intangible Assets Recorded in Connection with Acquisition (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets as of the acquisition date, Amount	$63,000	'
Atrium [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets as of the acquisition date, Amount	90,000	'
Atrium [Member] \| Syndicate Capacity [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets as of the acquisition date, Amount	32,900	'
Atrium [Member] \| Management Contract [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets as of the acquisition date, Amount	30,100	'
Distribution Channel [Member] \| Atrium [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets as of the acquisition date, Amount	20,000	'
Intangible assets as of the acquisition date, Economic Useful Life	'15 years	'
Brand [Member] \| Atrium [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets as of the acquisition date, Amount	$7,000	'
Intangible assets as of the acquisition date, Economic Useful Life	'10 years	'

Acquisitions_Pro_Forma_Condens

Acquisitions - Pro Forma Condensed Combined Statement of Earnings (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total income	$571,882	$725,962
Total expenses	-337,701	-422,234
Noncontrolling interest	-22,388	-71,473
Net earnings	211,793	232,255
Net earnings per ordinary share - basic	$12.82	$14.13
Net earnings per ordinary share - diluted	$12.68	$13.96
Weighted average ordinary shares outstanding - basic	16,523,369,000	16,441,461,000
Weighted average ordinary shares outstanding - diluted	16,703,442,000	16,638,021,000
Enstar Group Limited [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total income	416,570	163,453
Total expenses	-192,748	28,066
Noncontrolling interest	-15,218	-23,502
Net earnings	208,604	168,017
Net earnings per ordinary share - basic	'	'
Net earnings per ordinary share - diluted	'	'
Weighted average ordinary shares outstanding - basic	'	'
Weighted average ordinary shares outstanding - diluted	'	'
Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total income	91,126	82,343
Total expenses	-68,545	-52,277
Noncontrolling interest	'	'
Net earnings	22,581	30,066
Net earnings per ordinary share - basic	'	'
Net earnings per ordinary share - diluted	'	'
Weighted average ordinary shares outstanding - basic	'	'
Weighted average ordinary shares outstanding - diluted	'	'
Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total income	15,911	199,939
Total expenses	-18,783	-108,185
Noncontrolling interest	'	'
Net earnings	-2,872	91,754
Net earnings per ordinary share - basic	'	'
Net earnings per ordinary share - diluted	'	'
Weighted average ordinary shares outstanding - basic	'	'
Weighted average ordinary shares outstanding - diluted	'	'
Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total income	48,275	280,227
Total expenses	-48,094	-267,983
Noncontrolling interest	'	'
Net earnings	181	12,244
Net earnings per ordinary share - basic	'	'
Net earnings per ordinary share - diluted	'	'
Weighted average ordinary shares outstanding - basic	'	'
Weighted average ordinary shares outstanding - diluted	'	'
Pro forma Adjustments [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total income	'	'
Total expenses	-9,531	-21,855
Noncontrolling interest	-7,170	-47,971
Net earnings	-16,701	-69,826
Net earnings per ordinary share - basic	'	'
Net earnings per ordinary share - diluted	'	'
Weighted average ordinary shares outstanding - basic	'	'
Weighted average ordinary shares outstanding - diluted	'	'
Pro forma Adjustments [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-4,671	-5,250
Pro forma Adjustments [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-1,329	-2,181
Pro forma Adjustments [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	($3,531)	($14,424)

Acquisitions_Summary_of_Pro_Fo

Acquisitions - Summary of Pro Forma Adjustments to Pro Forma Condensed Combined Statement of Earnings (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	($337,701)	($422,234)
Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-68,545	-52,277
Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-18,783	-108,185
Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-48,094	-267,983
Pro forma Adjustments [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-9,531	-21,855
Pro forma Adjustments [Member] \| Noncontrolling Interest [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-7,170	-47,971
Pro forma Adjustments [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-4,671	-5,250
Pro forma Adjustments [Member] \| Atrium [Member] \| Noncontrolling Interest [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-8,406	-11,400
Pro forma Adjustments [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-1,329	-2,181
Pro forma Adjustments [Member] \| Arden [Member] \| Noncontrolling Interest [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	1,236	-36,571
Pro forma Adjustments [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-3,531	-14,424
Pro forma Adjustments [Member] \| Pavonia [Member] \| Noncontrolling Interest [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	'
Pro forma Adjustments [Member] \| Interest Expense [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-4,658	-7,766
Pro forma Adjustments [Member] \| Interest Expense [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-3,105	-3,685
Pro forma Adjustments [Member] \| Interest Expense [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-1,111	-1,854
Pro forma Adjustments [Member] \| Interest Expense [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-442	-2,227
Pro forma Adjustments [Member] \| Amortization [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-5,076	-13,660
Pro forma Adjustments [Member] \| Amortization [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-2,033	-2,033
Pro forma Adjustments [Member] \| Amortization [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-218	-327
Pro forma Adjustments [Member] \| Amortization [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-2,825	-11,300
Pro forma Adjustments [Member] \| Actuarial Estimates [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-2,166	'
Pro forma Adjustments [Member] \| Actuarial Estimates [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	'
Pro forma Adjustments [Member] \| Actuarial Estimates [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	'
Pro forma Adjustments [Member] \| Actuarial Estimates [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	-2,166	'
Pro forma Adjustments [Member] \| Income Tax [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	2,369	8,235
Pro forma Adjustments [Member] \| Income Tax [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	467	468
Pro forma Adjustments [Member] \| Income Tax [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	'
Pro forma Adjustments [Member] \| Income Tax [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	1,902	7,767
Pro forma Adjustments [Member] \| Unlocking and Reassessment [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	-8,664
Pro forma Adjustments [Member] \| Unlocking and Reassessment [Member] \| Atrium [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	'
Pro forma Adjustments [Member] \| Unlocking and Reassessment [Member] \| Arden [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	'
Pro forma Adjustments [Member] \| Unlocking and Reassessment [Member] \| Pavonia [Member]	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'
Total expenses	'	($8,664)

Significant_New_Business_Addit

Significant New Business - Additional Information (Detail)

12 Months Ended

0 Months Ended

12 Months Ended

1 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 17, 2012

Sep. 01, 2011

Aug. 06, 2012

Jan. 01, 2014

Dec. 31, 2013

Jul. 06, 2012

Sep. 20, 2011

Apr. 26, 2013

Feb. 28, 2011

Jun. 30, 2012

USD ($)

GBP (£)

USD ($)

GBP (£)

Claremont [Member]

Subsequent Event [Member]

Reciprocal of America [Member]

Torus Insurance - Australian Branch [Member]

American Physicians [Member]

Shelbourne [Member]

Zurich Danish Portfolio [Member]

USD ($)

GBP (£)

Reinsurance Agreement under 2014 [Member]

USD ($)

AUD

USD ($)

Agreement

USD ($)

Agreement

Business Acquisition [Line Items]

Net insurance reserve assumed

$25.30

£ 15.3

Total assets and assumed gross reinsurance reserves received

22.5

169

9.7

35.3

Expected closing period of transaction

'Second quarter of 2014

Percentage of reinsurance agreement

100.00%

Gross insurance reserves

$51.40

£ 33.8

$313.30

£ 193

$129.60

Number of quota share reinsurance agreements entered with Torus

Percentage of underwriting capacity provided for Syndicate

100.00%

Number of RITC agreements with Lloyd's syndicates

Investments_Estimated_Fair_Val

Investments - Estimated Fair Values of Investments in Fixed Maturity Securities, Short-Term Investments and Equities, Trading Securities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	$3,662,721	$2,572,321
Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	3,844,754	2,686,909
U.S. Government and Agency [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	439,946	361,906
Non-U.S. Government [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	476,224	265,722
Corporate [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	2,123,675	1,598,876
Municipal [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	41,034	20,446
Residential Mortgage-Backed [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	218,457	115,594
Commercial Mortgage-Backed [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	114,637	130,848
Asset-Backed [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	248,748	78,929
Total Fixed Maturity and Short-term Investments [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	3,662,721	2,572,321
Equities - U.S. [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	115,285	92,406
Equities - International [Member] \| Estimate of Fair Value Measurement [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Estimated fair value of trading securities	$66,748	$22,182

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
	Security	Security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments as held-to-maturity	'	$0
Number of securities classified as available-for-sale in an unrealized loss position	135	30
Fair value of securities classified as available-for-sale in an unrealized loss position	121,830,000	28,968,000
Number of securities classified as available-for-sale in an unrealized loss position for twelve months or longer	2	23
Securities considered as other than temporarily impaired	0	'
Other-than-temporary impairment credit losses recognized	0	'
Other-than-temporary impairment credit losses	0	'
Other investments recorded in private equities	569,293,000	414,845,000
Side-pockets investments	3,150,000	'
Investments	4,660,411,000	3,352,875,000
Transfers between Levels 1 and 2	0	0
Restricted cash	397,657,000	299,965,000
Fixed Income Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Imposed lock-up period	'3 years	'
Number of days to give notice for quarterly hedge fund redemptions	'90 days	'
Investment in the funds will be eligible for redemption	31-Mar-14	'
Side-pockets investments	3,150,000	'
Real Estate Debt Fund [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other investments recorded in private equities	32,113,000	16,179,000
Redemption request description	'A redemption request for this fund can be made 10 days after the date of any monthly valuation	'
Side-pockets investments	'	'
Private Equity Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other investments recorded in private equities	161,229,000	127,696,000
Percent of other investments recorded in private equities	2.50%	3.00%
Side-pockets investments	'	'
Residential Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of securities classified as available-for-sale in an unrealized loss position	13,632,000	1,124,000
Investments	235,964,000	120,092,000
Commercial Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	114,637,000	131,329,000
U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Mortgage-backed securities	177,900,000	68,400,000
Fair value of securities classified as available-for-sale in an unrealized loss position	11,416,000	'
Investments	468,289,000	366,863,000
Residential and commercial mortgaged-backed securities [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Mortgage-backed securities	12,500,000	3,500,000
Held-to-maturity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	799,559,000	0
Held-to-maturity Securities [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	18,132,000	'
Seabright Pavonia Companies, Arden and Atrium [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Increase of restricted assets	1,890,000,000	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Number of corporate security	1	'
Investments	270,903,000	206,671,000
Fair value of changes in assets	48,800,000	18,600,000
Significant Unobservable Inputs (Level 3) [Member] \| Residential Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Commercial Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Held-to-maturity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Held-to-maturity Securities [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'

Investments_Credit_Ratings_of_

Investments - Credit Ratings of Fixed Maturity Securities and Short-Term Investments, Trading (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Fair Value	$3,662,721	$2,572,321
Percentage of Total Fair Value	100.00%	100.00%
AAA [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Fair Value	502,057	418,297
Percentage of Total Fair Value	13.70%	16.30%
AA [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Fair Value	1,430,107	958,267
Percentage of Total Fair Value	39.10%	37.20%
A [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Fair Value	1,191,142	812,428
Percentage of Total Fair Value	32.50%	31.60%
BBB or Lower [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Fair Value	461,614	376,347
Percentage of Total Fair Value	12.60%	14.60%
Not Rated [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Fair Value	$77,801	$6,982
Percentage of Total Fair Value	2.10%	0.30%

Investments_Amortized_Cost_and

Investments - Amortized Cost and Estimated Fair Values of Company's Fixed Maturity Securities Classified as Held to Maturity (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	$859,387
Gross Unrealized Holding Gains	130
Gross Unrealized Holding Losses Non-OTTI	-59,958
Fair Value	799,559
U.S. Government and Agency [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	19,992
Gross Unrealized Holding Gains	6
Gross Unrealized Holding Losses Non-OTTI	-1,866
Fair Value	18,132
Non-U.S. Government [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	23,592
Gross Unrealized Holding Gains	19
Gross Unrealized Holding Losses Non-OTTI	-1,284
Fair Value	22,327
Corporate [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	815,803
Gross Unrealized Holding Gains	105
Gross Unrealized Holding Losses Non-OTTI	-56,808
Fair Value	$759,100

Investments_Summary_of_Amortiz

Investments - Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Due in one year or less, Amortized Cost	$17,541
Due after one year through five years, Amortized Cost	87,698
Due after five years through ten years, Amortized Cost	133,102
Due after ten years, Amortized Cost	621,046
Amortized cost due in years, Total	859,387
Due in one year or less, Fair Value	17,579
Due after one year through five years, Fair Value	86,611
Due after five years through ten years, Fair Value	126,541
Due after ten years, Fair Value	568,828
Fair value due in years, Total	$799,559
Due in one year or less, Percentage of Total Fair Value	2.20%
Due after one year through five years, Percentage of Total Fair Value	10.80%
Due after five years through ten years, Percentage of Total Fair Value	15.80%
Due after ten years, Percentage of Total Fair Value	71.20%
Percentage of Fair Value, Total	100.00%

Investments_Credit_Ratings_Com

Investments - Credit Ratings Company's Fixed Maturity Securities Held to Maturity (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	$859,387
Fair Value	799,559
% of Total Fair Value	100.00%
AAA [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	47,949
Fair Value	44,552
% of Total Fair Value	5.60%
AA [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	259,163
Fair Value	239,188
% of Total Fair Value	29.90%
A [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	496,986
Fair Value	463,001
% of Total Fair Value	57.90%
BBB or Lower [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	54,759
Fair Value	52,282
% of Total Fair Value	6.50%
Not Rated [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
Amortized Cost	530
Fair Value	$536
% of Total Fair Value	0.10%

Investments_Amortized_Cost_and1

Investments - Amortized Cost and Estimated Fair Values of Company's Fixed Maturity Securities Classified as Available-for-Sale (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$243,302	$245,396
Gross Unrealized Holding Gains	3,501	6,452
Gross Unrealized Holding Losses Non-OTTI	-439	-727
Fair Value	246,364	251,121
U.S. Government and Agency [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	28,050	4,503
Gross Unrealized Holding Gains	303	454
Gross Unrealized Holding Losses Non-OTTI	-10	'
Fair Value	28,343	4,957
Non-U.S. Government [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	84,443	120,634
Gross Unrealized Holding Gains	1,871	3,373
Gross Unrealized Holding Losses Non-OTTI	-22	-151
Fair Value	86,292	123,856
Corporate [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	76,942	115,139
Gross Unrealized Holding Gains	1,221	2,379
Gross Unrealized Holding Losses Non-OTTI	-259	-524
Fair Value	77,904	116,994
Residential Mortgage-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	17,523	4,308
Gross Unrealized Holding Gains	102	230
Gross Unrealized Holding Losses Non-OTTI	-118	-40
Fair Value	17,507	4,498
Commercial Mortgage-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	'	474
Gross Unrealized Holding Gains	'	7
Gross Unrealized Holding Losses Non-OTTI	'	'
Fair Value	'	481
Asset-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	36,344	338
Gross Unrealized Holding Gains	4	9
Gross Unrealized Holding Losses Non-OTTI	-30	-12
Fair Value	$36,318	$335

Investments_Summary_of_Investm

Investments - Summary of Investments Classified as Available-for-Sale in Unrealized Loss Position as Well as Aggregate Fair Value and Gross Unrealized Loss by Length of Time (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value, 12 Months or Greater	'	$17,880
Unrealized Losses, 12 Months or Greater	'	-220
Fair Value, Less Than 12 Months	121,830	11,088
Unrealized Losses, Less Than 12 Months	-439	-507
Fair Value, Total	121,830	28,968
Unrealized Losses, Total	-439	-727
Non-U.S. Government [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value, 12 Months or Greater	'	2,646
Unrealized Losses, 12 Months or Greater	'	-82
Fair Value, Less Than 12 Months	20,406	2,399
Unrealized Losses, Less Than 12 Months	-22	-69
Fair Value, Total	20,406	5,045
Unrealized Losses, Total	-22	-151
Corporate [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value, 12 Months or Greater	'	13,936
Unrealized Losses, 12 Months or Greater	'	-86
Fair Value, Less Than 12 Months	51,478	8,689
Unrealized Losses, Less Than 12 Months	-259	-438
Fair Value, Total	51,478	22,625
Unrealized Losses, Total	-259	-524
Residential Mortgage-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value, 12 Months or Greater	'	1,124
Unrealized Losses, 12 Months or Greater	'	-40
Fair Value, Less Than 12 Months	13,632	'
Unrealized Losses, Less Than 12 Months	-118	'
Fair Value, Total	13,632	1,124
Unrealized Losses, Total	-118	-40
Asset-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value, 12 Months or Greater	'	174
Unrealized Losses, 12 Months or Greater	'	-12
Fair Value, Less Than 12 Months	24,898	'
Unrealized Losses, Less Than 12 Months	-30	'
Fair Value, Total	24,898	174
Unrealized Losses, Total	-30	-12
U.S. Government and Agency [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value, 12 Months or Greater	'	'
Unrealized Losses, 12 Months or Greater	'	'
Fair Value, Less Than 12 Months	11,416	'
Unrealized Losses, Less Than 12 Months	-10	'
Fair Value, Total	11,416	'
Unrealized Losses, Total	($10)	'

Investments_Summary_of_Contrac

Investments - Summary of Contractual Maturities of Company's Fixed Maturity Securities Classified as Available-for-Sale (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Due in one year or less, Amortized Cost	$45,295	$173,113
Due after one year through five years, Amortized Cost	141,400	64,089
Due after five years through ten years, Amortized Cost	69	'
Due after ten years, Amortized cost	2,671	3,074
Amortized cost due in years, Total	189,435	240,276
Total amortized cost	243,302	245,396
Due in one year or less, Fair Value	45,596	173,949
Due after one year through five years, Fair Value	143,445	68,298
Due after five years through ten years, Fair Value	70	'
Due after ten years, Fair Value	3,428	3,560
Total fair value or available for sale debt securities due in years	192,539	245,807
Total fair value	246,364	251,121
Due in one year or less, Percentage of Total Fair Value	18.50%	69.30%
Due after one year through five years, Percentage of Total Fair Value	58.20%	27.20%
Due after five years through ten years, Percentage of Total Fair Value	0.10%	'
Due after ten years, Percentage of Total Fair Value	1.40%	1.40%
Percentage of Total Fair Value	78.20%	97.90%
Percentage of Total Fair Value	100.00%	100.00%
Residential Mortgage-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total amortized cost	17,523	4,308
Total fair value	17,507	4,498
Percentage of Total Fair Value	7.10%	1.80%
Asset-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total amortized cost	36,344	338
Total fair value	36,318	335
Percentage of Total Fair Value	14.70%	0.10%
Commercial Mortgage-Backed [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total amortized cost	'	474
Total fair value	'	$481
Percentage of Total Fair Value	'	0.20%

Investments_Credit_Ratings_Com1

Investments - Credit Ratings Company's Fixed Maturity Securities and Short-term Investments Available-for-Sale (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$243,302	$245,396
Fair Value	246,364	251,121
Percentage of Total Fair Value	100.00%	100.00%
AAA [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	125,729	107,615
Fair Value	127,433	110,829
Percentage of Total Fair Value	51.70%	44.10%
AA [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	74,692	59,535
Fair Value	75,181	60,742
Percentage of Total Fair Value	30.50%	24.20%
A [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	33,834	72,773
Fair Value	34,607	73,935
Percentage of Total Fair Value	14.10%	29.40%
BBB or Lower [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	8,957	5,281
Fair Value	8,963	5,197
Percentage of Total Fair Value	3.60%	2.10%
Not Rated [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	90	192
Fair Value	$180	$418
Percentage of Total Fair Value	0.10%	0.20%

Investments_Other_Investments_

Investments - Other Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	$569,293	$414,845
Private Equity Funds [Member]	'	'
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	161,229	127,696
Fixed Income Funds [Member]	'	'
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	194,375	156,235
Fixed Income Hedge Funds [Member]	'	'
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	68,157	53,933
Equity Fund [Member]	'	'
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	109,355	55,881
Real Estate Debt Fund [Member]	'	'
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	32,113	16,179
Other [Member]	'	'
Investment Holdings [Line Items]	'	'
Other investments recorded in private equities	$4,064	$4,921

Investments_Summary_of_Fair_Va

Investments - Summary of Fair Value, Unfunded Commitments and Redemption Frequency (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	$569,293	$414,845
Gated/Side Pocket Investments	3,150	'
Investments without Gates or Side Pockets	566,143	414,845
Unfunded Commitments	114,240	87,591
Private Equity Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	161,229	127,696
Gated/Side Pocket Investments	'	'
Investments without Gates or Side Pockets	161,229	127,696
Unfunded Commitments	113,585	86,936
Redemption Frequency	'Not eligible	'Not eligible
Fixed Income Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	194,375	156,235
Gated/Side Pocket Investments	'	'
Investments without Gates or Side Pockets	194,375	156,235
Unfunded Commitments	'	'
Redemption Frequency	'Daily to monthly	'Daily to monthly
Fixed Income Hedge Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	68,157	53,933
Gated/Side Pocket Investments	3,150	'
Investments without Gates or Side Pockets	65,007	53,933
Unfunded Commitments	'	'
Redemption Frequency	'Quarterly after lock-up periods expire	'Quarterly after lock-up periods expire
Real Estate Debt Fund [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	32,113	16,179
Gated/Side Pocket Investments	'	'
Investments without Gates or Side Pockets	32,113	16,179
Unfunded Commitments	'	'
Redemption Frequency	'Monthly	'Monthly
Other [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	4,064	4,921
Gated/Side Pocket Investments	'	'
Investments without Gates or Side Pockets	4,064	4,921
Unfunded Commitments	655	655
Redemption Frequency	'Not eligible	'Not eligible
Equity Fund [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Fair Value	109,355	55,881
Gated/Side Pocket Investments	'	'
Investments without Gates or Side Pockets	109,355	55,881
Unfunded Commitments	'	'
Redemption Frequency	'Bi-monthly	'Bi-monthly

Investments_Categorized_Invest

Investments - Categorized Investments Recorded at Fair Value among Levels (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	$4,660,411	$3,352,875
U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	468,289	366,863
Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	562,516	389,578
Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	2,201,579	1,715,870
Municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	41,034	20,446
Residential Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	235,964	120,092
Commercial Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	114,637	131,329
Asset-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	285,066	79,264
Equities - U.S. [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	115,285	92,406
Equities - International [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	66,748	22,182
Other Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	569,293	414,845
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	133,147	94,324
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Residential Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Commercial Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Asset-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Equities - U.S. [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	97,470	83,947
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Equities - International [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	35,677	10,377
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Other Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	4,256,361	3,051,880
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	468,289	366,863
Significant Other Observable Inputs (Level 2) [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	562,516	389,578
Significant Other Observable Inputs (Level 2) [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	2,200,970	1,715,330
Significant Other Observable Inputs (Level 2) [Member] \| Municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	41,034	20,446
Significant Other Observable Inputs (Level 2) [Member] \| Residential Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	235,964	120,092
Significant Other Observable Inputs (Level 2) [Member] \| Commercial Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	114,637	131,329
Significant Other Observable Inputs (Level 2) [Member] \| Asset-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	285,066	79,264
Significant Other Observable Inputs (Level 2) [Member] \| Equities - U.S. [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	13,090	5,058
Significant Other Observable Inputs (Level 2) [Member] \| Equities - International [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	31,071	11,805
Significant Other Observable Inputs (Level 2) [Member] \| Other Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	303,724	212,115
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	270,903	206,671
Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	609	540
Significant Unobservable Inputs (Level 3) [Member] \| Municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Residential Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Commercial Mortgage-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Asset-Backed [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Equities - U.S. [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	4,725	3,401
Significant Unobservable Inputs (Level 3) [Member] \| Equities - International [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Significant Unobservable Inputs (Level 3) [Member] \| Other Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	265,569	202,730
Held-to-maturity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	799,559	0
Held-to-maturity Securities [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	18,132	'
Held-to-maturity Securities [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	22,327	'
Held-to-maturity Securities [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	759,100	'
Held-to-maturity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	799,559	'
Held-to-maturity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	18,132	'
Held-to-maturity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	22,327	'
Held-to-maturity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	759,100	'
Held-to-maturity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government and Agency [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Non-U.S. Government [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'
Held-to-maturity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Corporate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	'

Investments_Reconciliation_of_

Investments - Reconciliation of Beginning and Ending Balances for All Investments Measured at Fair Value on Recurring Basis (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Level 3 investments, beginning of period	$206,671	$141,221
Purchases	44,032	63,732
Sales	-28,568	-16,839
Total realized and unrealized gains through earnings	48,768	18,557
Net transfers into and/or (out of) Level 3	'	'
Level 3 investments, end of period	270,903	206,671
Fixed Maturity Investments [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Level 3 investments, beginning of period	540	519
Purchases	'	'
Sales	'	'
Total realized and unrealized gains through earnings	69	21
Net transfers into and/or (out of) Level 3	'	'
Level 3 investments, end of period	609	540
Other Investments [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Level 3 investments, beginning of period	202,730	137,727
Purchases	44,032	63,732
Sales	-28,568	-16,839
Total realized and unrealized gains through earnings	47,375	18,110
Net transfers into and/or (out of) Level 3	'	'
Level 3 investments, end of period	265,569	202,730
Equity Securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Level 3 investments, beginning of period	3,401	2,975
Purchases	'	'
Sales	'	'
Total realized and unrealized gains through earnings	1,324	426
Net transfers into and/or (out of) Level 3	'	'
Level 3 investments, end of period	$4,725	$3,401

Investments_Components_of_Net_

Investments - Components of Net Realized and Unrealized Gains (Losses) (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Investments Debt And Equity Securities [Abstract]

Gross realized gains on available-for-sale securities

$705

$5,850

$808

Gross realized losses on available-for-sale securities

-214

-727

-471

Net realized gains on trading securities

13,488

13,569

3,738

Net unrealized (losses) gains on trading securities

-13,791

23,541

3,945

Net realized and unrealized gains on other investments

70,463

31,379

1,194

Net realized and unrealized gains

31,440

37,010

-27,919

30,120

18,259

28,280

1,691

25,382

2,231

-8,512

9,133

6,362

70,651

73,612

9,214

Proceeds from sales and maturities of available-for-sale securities

$196,507

$353,913

$445,052

Investments_Major_Categories_o

Investments - Major Categories of Net Investment Income (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Net Investment Income [Line Items]

Net amortization of bond premiums and discounts

($51,505)

($28,758)

($25,245)

Dividends from equities

4,923

2,961

1,786

Other investments

652

661

734

Interest on other receivables

2,001

6,887

6,572

Other income

2,999

5,229

3,118

Interest on deposits held with clients

3,650

1,368

1,188

Investment expenses

-6,685

-4,279

-3,462

Interest from investments

23,071

25,009

27,252

17,963

16,765

19,658

20,894

20,443

15,571

18,498

19,059

15,548

93,295

77,760

68,676

Fixed Maturity Investments [Member]

Net Investment Income [Line Items]

Interest from investments

123,555

78,767

70,753

Cash and Cash Equivalents and Short-term Investments [Member]

Net Investment Income [Line Items]

Interest from investments

$13,705

$14,924

$13,232

Investments_Schedule_of_Carryi

Investments - Schedule of Carrying Value of Restricted Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Restricted Assets [Abstract]	'	'
Collateral in trust for third party agreements	$2,002,374	$570,391
Assets on deposit with regulatory authorities	608,940	212,012
Collateral for secured letter of credit facility	310,938	246,608
Restricted Investments, Total	$2,922,252	$1,029,011

Derivative_Instruments_Estimat

Derivative Instruments - Estimated Fair Value and Realized Gains (Losses) on Derivative Instruments (Detail) (Forward Contracts [Member])

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

USD ($)

Foreign Exchange Forward Contract [Member]

USD ($)

AUD

USD ($)

AUD

USD ($)

AUD

USD ($)

GBP (£)

Derivative [Line Items]

Net Foreign Exchange Gains (Losses)

$1,475

($1,261)

$1,091

$779

($238)

($630)

$3,008

$303

($1,917)

$1,023

($1,023)

Settlement Date

3-Jan-14

10-May-13

2-Dec-11

3-Jan-14

2-Dec-11

10-May-13

19-Dec-12

30-Jun-11

6-Mar-13

Fair Value

149

-1,261

779

-238

-630

-1,023

Contract Date

26-Nov-13

8-Feb-12

23-Aug-11

1-Jul-13

22-Sep-11

8-Feb-12

12-Oct-10

6-Mar-12

Contract Amount and Settlement Amount

$41,036

$36,099

$36,981

45,000

35,000

$40,887

$33,973

45,000

35,000

$36,099

$26,165

$42,476

45,000

25,000

45,000

$26,611

£ 17,000

Reinsurance_Balances_Recoverab2

Reinsurance Balances Recoverable - Summary of Reinsurance Reserves Recoverable (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Effects of Reinsurance [Line Items]	'	'
Recoverable from reinsurers on outstanding losses	$828,038	$665,303
Recoverable from reinsurers on losses incurred but not reported	413,344	295,922
Recoverable from reinsurers on fair value adjustments	-65,456	-85,005
Total reinsurance reserves recoverable	1,175,926	876,220
Paid losses recoverable	187,893	246,699
Total reinsurance recoverable	1,363,819	1,122,919
Non-Life Run-Off [Member]	'	'
Effects of Reinsurance [Line Items]	'	'
Recoverable from reinsurers on outstanding losses	788,705	665,303
Recoverable from reinsurers on losses incurred but not reported	402,675	295,922
Recoverable from reinsurers on fair value adjustments	-69,847	-85,005
Total reinsurance reserves recoverable	1,121,533	876,220
Paid losses recoverable	177,459	246,408
Total reinsurance recoverable	1,298,992	1,122,628
Active Underwriting [Member]	'	'
Effects of Reinsurance [Line Items]	'	'
Recoverable from reinsurers on outstanding losses	10,777	'
Recoverable from reinsurers on losses incurred but not reported	9,887	'
Recoverable from reinsurers on fair value adjustments	4,391	'
Total reinsurance reserves recoverable	25,055	'
Paid losses recoverable	7,845	'
Total reinsurance recoverable	32,900	'
Life and Annuity [Member]	'	'
Effects of Reinsurance [Line Items]	'	'
Recoverable from reinsurers on outstanding losses	28,556	'
Recoverable from reinsurers on losses incurred but not reported	782	'
Recoverable from reinsurers on fair value adjustments	'	'
Total reinsurance reserves recoverable	29,338	'
Paid losses recoverable	2,589	291
Total reinsurance recoverable	$31,927	$291

Reinsurance_Balances_Recoverab3

Reinsurance Balances Recoverable - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	$1,363,819,000	$1,122,919,000	'
Reinsurance balance recoverable	-430,542,000	-666,793,000	-238,818,000
Provision for uncollectible reinsurance recoverable relating to total reinsurance recoverable	338,600,000	343,900,000	'
Ratio of provision for uncollectible reinsurance recoverable to reinsurance balances receivable	19.90%	23.40%	'
Percentage of top ten reinsurers reinsurance balances recoverable	100.00%	100.00%	'
Losses incurred but not reported	413,344,000	295,922,000	'
Ceded Credit Risk, Concentrated Credit Risk [Member] \| Top Ten Reinsurers [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	930,943,000	708,953,000	'
Percentage of top ten reinsurers reinsurance balances recoverable	68.30%	63.10%	'
Losses incurred but not reported	290,100,000	194,500,000	'
Ceded Credit Risk, Concentrated Credit Risk [Member] \| One BBB+ Rated [Member] \| Standard & Poor's, BBB+ Rating [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	41,400,000	37,700,000	'
Ceded Credit Risk, Concentrated Credit Risk [Member] \| Non-Rated Reinsurer [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	256,200,000	'	'
Ceded Credit Risk, Concentrated Credit Risk [Member] \| One Reinsurer Accounting for More than 10% of Total Reinsurance Balances Receivable [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	256,200,000	144,100,000	'
Reinsurance recoverable secured by trust funds	256,200,000	121,700,000	'
Reinsurance recoverable major reinsurer	10.00%	'	'
Non-Life Run-Off [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	1,298,992,000	1,122,628,000	'
Reinsurance balance recoverable	208,900,000	'	'
Losses incurred but not reported	402,675,000	295,922,000	'
Life and Annuity [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Reinsurance balances recoverable	31,927,000	291,000	'
Losses incurred but not reported	$782,000	'	'

Reinsurance_Balances_Recoverab4

Reinsurance Balances Recoverable - Reinsurance Balances Recoverable by Reinsurer (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Ceded Credit Risk [Line Items]	'	'
Reinsurance balances recoverable	$1,363,819	$1,122,919
% of Total	100.00%	100.00%
Ceded Credit Risk, Concentrated Credit Risk [Member] \| Top Ten Reinsurers [Member]	'	'
Ceded Credit Risk [Line Items]	'	'
Reinsurance balances recoverable	930,943	708,953
% of Total	68.30%	63.10%
Ceded Credit Risk, Not Concentrated Credit Risk [Member] \| Other Reinsurers' Balances Greater Than $1 Million [Member]	'	'
Ceded Credit Risk [Line Items]	'	'
Reinsurance balances recoverable	423,013	409,666
% of Total	31.00%	36.50%
Ceded Credit Risk, Not Concentrated Credit Risk [Member] \| Other Reinsurers' Balances Less Than $1 Million [Member]	'	'
Ceded Credit Risk [Line Items]	'	'
Reinsurance balances recoverable	$9,863	$4,300
% of Total	0.70%	0.40%

Losses_and_Loss_Adjustment_Exp2

Losses and Loss Adjustment Expenses - Losses and Loss Adjustment Expenses (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Effects of Reinsurance [Line Items]	'	'
Outstanding	$2,621,760	$2,358,329
Incurred but not reported	1,816,453	1,588,310
Fair value adjustment	-218,308	-296,512
Losses and loss adjustment expenses	4,219,905	3,650,127
Non-Life Run-Off [Member]	'	'
Effects of Reinsurance [Line Items]	'	'
Outstanding	2,541,934	2,358,329
Incurred but not reported	1,717,870	1,588,310
Fair value adjustment	-255,291	-296,512
Losses and loss adjustment expenses	4,004,513	3,650,127
Active Underwriting [Member]	'	'
Effects of Reinsurance [Line Items]	'	'
Outstanding	79,826	'
Incurred but not reported	98,583	'
Fair value adjustment	36,983	'
Losses and loss adjustment expenses	$215,392	'

Losses_and_Loss_Adjustment_Exp3

Losses and Loss Adjustment Expenses - Additional Information (Detail) (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

commutations

Effects of Reinsurance [Line Items]

Estimate of net ultimate liability for asbestos and environmental claims

$467,700,000

$557,600,000

$467,700,000

$557,600,000

Estimate of gross ultimate liability for asbestos and environmental claims

524,100,000

628,700,000

524,100,000

628,700,000

Reduction in estimates of net ultimate losses

-134,068,000

-27,850,000

-48,500,000

-5,062,000

-97,895,000

-58,506,000

-58,417,000

-3,298,000

-173,924,000

-43,615,000

-28,079,000

-2,612,000

-215,480,000

-218,116,000

-248,230,000

(Increase) reduction in provisions for bad debt

7,464,000

-5,465,000

-329,000

-527,000

-2,255,000

-38,751,000

-2,399,000

-1,672,000

1,999,000

-3,111,000

-42,822,000

Reduction in estimates of unallocated loss adjustment expense liabilities

-111,000

-16,320,000

-16,795,000

-16,403,000

-2,206,000

-12,579,000

-11,661,000

-12,852,000

-7,669,000

-14,113,000

-11,783,000

-11,537,000

-49,629,000

-39,298,000

-45,102,000

Amortization of fair value adjustments

-3,540,000

5,025,000

2,369,000

2,093,000

4,207,000

8,538,000

2,240,000

7,587,000

16,782,000

8,865,000

6,969,000

10,077,000

5,947,000

22,572,000

42,693,000

Net incurred favorable loss development

49,300,000

23,400,000

Total number of commutations

108

101

113

Net change in case and LAE reserves

310,500,000

317,600,000

311,600,000

Net paid losses

360,200,000

314,500,000

288,200,000

Net incurred liabilities settled by way of commutation

29,800,000

26,600,000

71,500,000

Assumed incurred liabilities

97,300,000

163,100,000

97,300,000

163,100,000

Ceded incurred reinsurance recoverables

67,500,000

136,500,000

67,500,000

136,500,000

Number of commutations completed outside the current fiscal year

Commutations related to ceded exposures

110

IBNR Reserves [Member]

Effects of Reinsurance [Line Items]

Net incurred favorable loss development

49,700,000

3,100,000

Reductions in IBNR reserves

265,200,000

267,400,000

224,800,000

Decrease in aggregate estimate of IBNR loss reserves related to asbestos liabilities

69,800,000

36,400,000

57,900,000

69,800,000

36,400,000

57,900,000

Decrease in aggregate estimate of IBNR loss reserves related to environmental liabilities

4,900,000

2,600,000

2,800,000

4,900,000

2,600,000

2,800,000

Decrease in aggregate estimate of IBNR loss reserves related to general casualty liabilities

42,600,000

96,300,000

91,600,000

42,600,000

96,300,000

91,600,000

Decrease in aggregate estimate of IBNR loss reserves related to workers compensation liabilities

42,100,000

52,700,000

42,100,000

52,700,000

Decrease in aggregate estimate of IBNR loss reserves related to other remaining liabilities

105,800,000

79,700,000

72,500,000

105,800,000

79,700,000

72,500,000

Net IBNR reserves

52,400,000

Reduction in Estimates of Net Ultimate Losses [Member]

Effects of Reinsurance [Line Items]

Net increase (decrease) in ultimate loss and loss adjustment expense liabilities

183,000,000

238,000,000

293,500,000

Losses and loss adjustment expenses relating to prior periods

257,100,000

Reduction in estimates of net ultimate losses

215,500,000

218,100,000

248,200,000

Reduction in Estimates of Net Ultimate Losses [Member] | SeaBright [Member]

Effects of Reinsurance [Line Items]

Impact of losses incurred

$74,100,000

Losses_and_Loss_Adjustment_Exp4

Losses and Loss Adjustment Expenses - Losses Incurred and Paid Reflected Net of Reinsurance Recoverables (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Effects of Reinsurance [Line Items]

Less: total reinsurance reserves recoverable

$876,220

Current period

-74,139

Total net reduction in ultimate losses and loss adjustment expense liabilities

125,056

20,374

27,403

-9,161

96,223

62,547

68,365

10,818

203,562

51,262

34,565

4,072

163,672

237,953

293,461

Net losses paid:

360,200

314,500

288,200

Plus: total reinsurance reserves recoverable

1,175,926

876,220

1,175,926

876,220

Non-Life Run-Off [Member]

Effects of Reinsurance [Line Items]

Balance as at January 1

3,650,127

4,272,082

3,291,275

3,650,127

4,272,082

3,291,275

Less: total reinsurance reserves recoverable

876,220

1,383,003

525,440

876,220

1,383,003

525,440

Reinsurance reserves recoverable

2,773,907

2,889,079

2,765,835

2,773,907

2,889,079

2,765,835

Current period

74,139

Prior periods

-257,114

-237,953

-293,461

Total net reduction in ultimate losses and loss adjustment expense liabilities

-182,975

-237,953

-293,461

Net losses paid:

370,870

314,528

288,175

Current period

-10,656

Prior periods

-360,214

-314,528

-288,175

Effect of exchange rate movement

4,936

14,833

-7,987

Acquired on purchase of subsidiaries

557,476

600,046

Assumed business

100,506

422,476

112,821

Net balance as at December 31

2,882,980

2,773,907

2,889,079

2,882,980

2,773,907

2,889,079

Plus: total reinsurance reserves recoverable

1,121,533

876,220

1,383,003

1,121,533

876,220

1,383,003

Balance as at December 31

4,004,513

3,650,127

4,272,082

4,004,513

3,650,127

4,272,082

Active Underwriting [Member]

Effects of Reinsurance [Line Items]

Balance as at January 1

Less: total reinsurance reserves recoverable

Reinsurance reserves recoverable

Current period

19,303

Prior periods

Total net reduction in ultimate losses and loss adjustment expense liabilities

-19,303

Net losses paid:

30,626

Current period

30,626

Prior periods

Effect of exchange rate movement

1,286

Acquired on purchase of subsidiaries

200,374

Net balance as at December 31

190,337

Plus: total reinsurance reserves recoverable

25,055

Balance as at December 31

$215,392

Losses_and_Loss_Adjustment_Exp5

Losses and Loss Adjustment Expenses - Losses Incurred and Paid Reflected Net of Reinsurance Recoverables (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
	Dec. 31, 2013	Dec. 31, 2012	Pavonia [Member]	Pavonia [Member]
Effects of Reinsurance [Line Items]	'	'	'	'
Reserves acquired on purchase of subsidiaries	'	'	$11,000,000	'
Loss and loss adjustment expenses	$4,219,905,000	$3,650,127,000	$10,800,000	$11,000,000

Losses_and_Loss_Adjustment_Exp6

Losses and Loss Adjustment Expenses - Net Reduction (Increase) in Ultimate Losses and Loss Adjustment Expense Liabilities (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Effects of Reinsurance [Line Items]

Net reduction (increase) in ultimate losses and loss adjustment expense liabilities, Current Period

($74,139)

Net losses paid

360,200

314,500

288,200

Net change in case and LAE reserves

-310,500

-317,600

-311,600

Reduction (increase) in estimates of net ultimate losses

-134,068

-27,850

-48,500

-5,062

-97,895

-58,506

-58,417

-3,298

-173,924

-43,615

-28,079

-2,612

-215,480

-218,116

-248,230

Reduction in provisions for unallocated loss adjustment expense liabilities

-111

-16,320

-16,795

-16,403

-2,206

-12,579

-11,661

-12,852

-7,669

-14,113

-11,783

-11,537

-49,629

-39,298

-45,102

Amortization of fair value adjustments

-3,540

5,025

2,369

2,093

4,207

8,538

2,240

7,587

16,782

8,865

6,969

10,077

5,947

22,572

42,693

Total net reduction in ultimate losses and loss adjustment expense liabilities

-125,056

-20,374

-27,403

9,161

-96,223

-62,547

-68,365

-10,818

-203,562

-51,262

-34,565

-4,072

-163,672

-237,953

-293,461

Active Underwriting [Member]

Effects of Reinsurance [Line Items]

Net losses paid, Prior Period

Net change in case and LAE reserves, Prior Period

Net change in IBNR reserves, Prior Period

Reduction (increase) in estimates of net ultimate losses, Prior Period

Reduction in provisions for unallocated loss adjustment expense liabilities, Prior Period

Net reduction (increase) in ultimate losses and loss adjustment expense liabilities, Prior Period

Net losses paid, Current Period

-30,626

Net change in case and LAE reserves, Current Period

-9,621

Net change in IBNR reserves, Current Period

-1,653

Reduction (increase) in estimates of net ultimate losses, Current Period

19,352

Reduction in provisions for unallocated loss adjustment expense liabilities, Current Period

-49

Net reduction (increase) in ultimate losses and loss adjustment expense liabilities, Current Period

19,303

Net losses paid

30,626

Net change in case and LAE reserves

-9,621

Net change in IBNR reserves

-1,653

Reduction (increase) in estimates of net ultimate losses

19,352

Reduction in provisions for unallocated loss adjustment expense liabilities

-49

Total net reduction in ultimate losses and loss adjustment expense liabilities

19,303

Non-Life Run-Off [Member]

Effects of Reinsurance [Line Items]

Net losses paid, Prior Period

360,214

314,528

288,175

Net change in case and LAE reserves, Prior Period

-310,488

-265,222

-311,614

Net change in IBNR reserves, Prior Period

-265,206

-267,422

-224,791

Reduction (increase) in estimates of net ultimate losses, Prior Period

-215,480

-218,116

-248,230

(Increase) reduction in provisions for bad debt, Prior Period

1,999

-3,111

-42,822

Reduction in provisions for unallocated loss adjustment expense liabilities, Prior Period

-49,580

-39,298

-45,102

Amortization of fair value adjustments, Prior Period

5,947

22,572

42,693

Net reduction (increase) in ultimate losses and loss adjustment expense liabilities, Prior Period

257,114

237,953

293,461

Net losses paid, Current Period

10,656

Net change in case and LAE reserves, Current Period

29,555

Net change in IBNR reserves, Current Period

33,928

Reduction (increase) in estimates of net ultimate losses, Current Period

74,139

(Increase) reduction in provisions for bad debt, Current Period

Reduction in provisions for unallocated loss adjustment expense liabilities, Current Period

Amortization of fair value adjustments, Current Period

Net reduction (increase) in ultimate losses and loss adjustment expense liabilities, Current Period

74,139

Net losses paid

370,870

314,528

288,175

Net change in case and LAE reserves

-280,933

Net change in IBNR reserves

-231,278

Reduction (increase) in estimates of net ultimate losses

-141,341

(Increase) reduction in provisions for bad debt

1,999

Reduction in provisions for unallocated loss adjustment expense liabilities

-49,580

Amortization of fair value adjustments

5,947

Total net reduction in ultimate losses and loss adjustment expense liabilities

$182,975

$237,953

$293,461

Losses_and_Loss_Adjustment_Exp7

Losses and Loss Adjustment Expenses - Net Reduction (Increase) in Ultimate Losses and Loss Adjustment Expense Liabilities (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effects of Reinsurance [Line Items]	'	'	'
Premium income	$239,807,000	$3,511,000	$3,543,000
Current period activity	-74,139,000	'	'
Non-Life Run-Off [Member]	'	'	'
Effects of Reinsurance [Line Items]	'	'	'
Premium income	'	0	0
Current period activity	$74,139,000	'	'

Policy_Benefits_for_Life_and_A2

Policy Benefits for Life and Annuity Contracts - Schedule of Life and Annuity Benefits (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]	'	'
Life	$380,874	$11,027
Annuities	963,323	'
Policy benefits for life and annuity contracts	1,344,197	11,027
Fair value adjustments	-71,097	'
Policy benefits for life and annuity contracts	$1,273,100	$11,027

Premiums_Written_and_Earned_Sc

Premiums Written and Earned - Schedule of Net Premiums Written and Earned (Detail) (USD $)

11 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Non-Life Run-Off [Member]

Active Underwriting [Member]

Life and Annuity [Member]

Premiums Written And Earned [Line Items]

Direct, Premiums Written

$17,250,000

$10,214,000

Assumed, Premiums Written

-3,084,000

19,890,000

Ceded, Premiums Written

-4,933,000

Net, Premiums Written

9,233,000

30,104,000

63,900,000

3,500,000

Life, Premium Written, Life and annuities

63,856,000

3,511,000

3,543,000

Direct, Premiums Earned

221,933,000

5,421,000

5,240,000

121,986,000

12,416,000

87,531,000

5,421,000

5,240,000

Assumed, Premiums Earned

37,656,000

2,276,000

19,796,000

15,584,000

Ceded, Premiums Earned

-19,782,000

-1,910,000

-1,697,000

-11,651,000

-8,131,000

-1,910,000

-1,697,000

Net, Premiums Earned

239,807,000

3,511,000

3,543,000

12,341,000

28,134,000

41,216,000

30,920,000

112,611,000

32,212,000

29,323,000

30,540,000

34,380,000

741,000

819,000

822,000

896,000

974,000

1,080,000

1,192,000

1,271,000

94,984,000

3,511,000

3,543,000

Life, Premium Earned, Life and annuities

$94,984,000

$3,511,000

$3,543,000

Premiums_Written_and_Earned_Ad

Premiums Written and Earned - Additional Information (Detail) (USD $)

12 Months Ended

11 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

SeaBright [Member]

Life and Annuity [Member]

Active Underwriting [Member]

Pavonia [Member]

Atrium and Arden [Member]

Atrium [Member]

Arden [Member]

Premiums Written And Earned [Line Items]

Net premiums written

$9,200,000

$63,900,000

$3,500,000

$30,104,000

$30,100,000

Net premiums earned

239,807,000

3,511,000

3,543,000

112,600,000

29,323,000

30,540,000

34,380,000

741,000

819,000

822,000

896,000

974,000

1,080,000

1,192,000

1,271,000

94,984,000

3,511,000

3,543,000

32,212,000

32,200,000

Unearned premiums

$70,698,000

$1,200,000

$3,700,000

$59,500,000

$6,300,000

Retrospectively_Rated_Contract1

Retrospectively Rated Contracts - Additional Information (Detail) (USD $)	11 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013
Insurance [Abstract]	'	'
Accrued retrospective premiums receivable	$8,800,000	$8,800,000
Return of retrospective premiums	'	27,500,000
Direct premiums written	$0	'

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Goodwill, Beginning balance	$21,222	$21,222	'
Intangible assets with an indefinite life, Beginning balance	'	'	'
Goodwill, Acquired during the year	38,848	'	'
Intangible assets with an indefinite life, Acquired during the year	63,000	'	'
Goodwill, Ending balance	60,070	21,222	21,222
Intangible assets with an indefinite life, Ending balance	63,000	'	'
Goodwill and intangible assets, Beginning Balance	21,222	21,222	'
Goodwill and intangible assets, Acquired during the year	128,848	'	'
Goodwill and intangible assets, Ending balance	150,071	21,222	21,222
Intangible assets with a definite life, Beginning balance	211,507	'	'
Intangible assets with a definite life, Intangible assets amortization	21,200	22,600	42,700
Intangible assets with a definite life, Ending balance	250,947	211,507	'
Atrium [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Goodwill, Ending balance	38,848	'	'
Intangible assets with a definite life, Acquired during the year	90,000	'	'
Intangible assets with a definite life, Ending balance	27,000	'	'
Atrium [Member] \| Other [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Intangible assets with a definite life, Beginning balance	'	'	'
Intangible assets with a definite life, Acquired during the year	90,000	'	'
Intangible assets with a definite life, Intangible assets amortization	'	'	'
Intangible assets with a definite life, Ending balance	27,000	'	'
Fair Value Adjustments [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Intangible assets with a definite life, Beginning balance	211,507	243,904	'
Intangible assets with a definite life, Acquired during the year	33,623	-9,825	'
Intangible assets with a definite life, Intangible assets amortization	-21,183	-22,572	'
Intangible assets with a definite life, Ending balance	$223,947	$211,507	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Amortization of Intangible Assets	$21,200	$22,600	$42,700
Goodwill	60,070	21,222	21,222
Minimum [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Finite lived intangible assets amortization period	'10 years	'	'
Maximum [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Finite lived intangible assets amortization period	'15 years	'	'
Non-Life Run-Off [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Goodwill	21,200	21,200	'
Active Underwriting [Member]	'	'	'
Schedule Of Goodwill And Intangible Assets [Line Items]	'	'	'
Goodwill	$38,800	'	'

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Summary of Gross Carrying Value, Accumulated Amortization and Net Carrying Value of Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	$434,701	$374,078	'
Accumulated Amortization	-183,754	-162,571	'
Intangible assets with a definite life, Net Carrying Value	250,947	211,507	'
Intangible assets with an indefinite life, Carrying Value	63,000	'	'
Intangible assets, Gross Carrying Value	497,701	374,078	'
Intangible assets, Accumulated Amortization	21,200	22,600	42,700
Intangible assets, Net Carrying Value	313,947	211,507	'
Syndicate Capacity [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Intangible assets with an indefinite life, Carrying Value	32,900	'	'
Management Contract [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Intangible assets with an indefinite life, Carrying Value	30,100	'	'
Atrium [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	27,000	'	'
Accumulated Amortization	'	'	'
Intangible assets with a definite life, Net Carrying Value	27,000	'	'
Atrium [Member] \| Distribution Channel [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	20,000	'	'
Accumulated Amortization	'	'	'
Intangible assets with a definite life, Net Carrying Value	20,000	'	'
Atrium [Member] \| Brand [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	7,000	'	'
Accumulated Amortization	'	'	'
Intangible assets with a definite life, Net Carrying Value	7,000	'	'
Fair Value Adjustments [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	407,701	374,078	'
Accumulated Amortization	-183,754	-162,571	'
Intangible assets with a definite life, Net Carrying Value	223,947	211,507	243,904
Intangible assets, Accumulated Amortization	-21,183	-22,572	'
Fair Value Adjustments [Member] \| Losses and Loss Adjustment Expense [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	500,485	552,455	'
Accumulated Amortization	-282,178	-255,943	'
Intangible assets with a definite life, Net Carrying Value	218,307	296,512	'
Fair Value Adjustments [Member] \| Reinsurance Balances Recoverable [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	-179,116	-178,377	'
Accumulated Amortization	113,659	93,372	'
Intangible assets with a definite life, Net Carrying Value	-65,457	-85,005	'
Fair Value Adjustments [Member] \| Policy Benefits for Life and Annuity Contracts [Member]	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'
Gross Carrying Value	86,332	'	'
Accumulated Amortization	-15,235	'	'
Intangible assets with a definite life, Net Carrying Value	$71,097	'	'

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Summary of Estimated Amortization Expense of Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'	'
2014	$27,063	'
2015	21,869	'
2016	20,365	'
2017	19,652	'
2018	18,499	'
Intangible assets with a definite life, Net Carrying Value	250,947	211,507
Non-Life Run-Off [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2014	23,485	'
2015	19,246	'
2016	16,376	'
2017	14,569	'
2018	12,940	'
Intangible assets with a definite life, Net Carrying Value	86,616	'
Active Underwriting [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2014	-5,693	'
2015	-5,626	'
2016	-3,384	'
2017	-1,779	'
2018	-573	'
Intangible assets with a definite life, Net Carrying Value	-17,055	'
Life and Annuity [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2014	9,271	'
2015	8,249	'
2016	7,373	'
2017	6,862	'
2018	6,132	'
Intangible assets with a definite life, Net Carrying Value	$37,887	'

Loans_Payable_Additional_Infor

Loans Payable - Additional Information (Detail) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Jul. 31, 2013

Dec. 31, 2013

Mar. 04, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Aug. 26, 2013

Dec. 31, 2013

Feb. 05, 2013

Dec. 31, 2013

EGL Revolving Credit Facility [Member]

Clarendon Facility [Member]

Repurchase Agreements [Member]

SeaBright Surplus Notes [Member]

Restated Credit Agreement [Member]

SeaBright Facility [Member]

EGL Revolving Credit Facility [Member]

Minimum [Member]

Maximum [Member]

Line of Credit Facility [Line Items]

Interest expense

$12,400,000

$8,400,000

$8,500,000

$300,000

Loans payable outstanding, including accrued interest

452,446,000

107,430,000

Amount of credit facility agreement

250,000,000

106,500,000

375,000,000

Period of Revolving Credit Facility

'3 years

'5 years

'3 years

Revolving credit facility expiration date

30-Jun-14

31-Jul-18

Interest rate payable period, maximum

'6 months

Interest rate of credit facility

'LIBOR plus 2.75%

'LIBOR plus 3.50%

Commitment fee on unused portion of the EGL Revolving Credit Facility

1.10%

Percentage increase in interest rate if payment default occurs

1.00%

Amount borrowed under facility agreement

258,800,000

Borrowings interest rate

2.90%

Term facility agreement period

'4 years

Percentage of loan facility available to be drawn

50.00%

Interest rate of credit facility

Debt repayment date

12-Jul-15

21-Dec-16

Repayment of outstanding principal balance

27,500,000

Outstanding principal amount

448,795,000

106,500,000

79,000,000

111,000,000

Period of Revolving Credit Facility

'4 years

Amount of facility agreement

111,000,000

Interest rate payable period

'Semi-Annually

Undrawn and uncancelled fee percentage

1.00%

Repayment of outstanding principal and accrued interest

$12,100,000

Loans_Payable_Amounts_of_Loans

Loans Payable - Amounts of Loans Payable Outstanding (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]	'	'
Total long-term bank debt	$448,795	$106,500
Accrued interest	3,651	930
Total loans payable	452,446	107,430
EGL Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Clarendon Facility	8-Jul-13	'
Facility Term	'5 years	'
Total long-term bank debt	258,800	'
SeaBright Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Clarendon Facility	21-Dec-12	'
Facility Term	'3 years	'
Total long-term bank debt	111,000	'
Clarendon Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Clarendon Facility	12-Jul-11	'
Facility Term	'4 years	'
Total long-term bank debt	$78,995	$106,500

Redeemable_Noncontrolling_Inte2

Redeemable Noncontrolling Interest - Additional Information (Detail) (Northshore [Member], Trident [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Redeemable Noncontrolling Interest [Line Items]	'
Interest owned by an entity	40.00%
Adjustments recorded through retained earnings	$0
Atrium [Member]	'
Redeemable Noncontrolling Interest [Line Items]	'
Interest owned by an entity	100.00%
Arden [Member]	'
Redeemable Noncontrolling Interest [Line Items]	'
Interest owned by an entity	100.00%

Redeemable_Noncontrolling_Inte3

Redeemable Noncontrolling Interest - Carrying Amount of Equity Attributable to Noncontrolling Interest (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Noncontrolling Interest [Abstract]	'
Beginning balance	'
Redeemable noncontrolling interest, initial contributions	96,689
Net earnings attributable to redeemable noncontrolling interest	4,170
Ending balance	$100,859

Share_Capital_Additional_Infor

Share Capital - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended						0 Months Ended
In Thousands, except Share data, unless otherwise specified	Apr. 20, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Jul. 08, 2013	Apr. 20, 2011	Apr. 20, 2011	Apr. 20, 2011
				Minimum [Member]	Torus Insurance Holdings Limited [Member]	Voting Ordinary Shares and Non-Voting Convertible Ordinary Shares [Member]	Voting Ordinary Shares and Non-Voting Convertible Ordinary Shares [Member]	Series B Convertible Participating Non-Voting Perpetual Preferred Stock [Member]	Voting Ordinary Shares [Member]	Series C Non-Voting Ordinary Shares [Member]	Non-Voting Ordinary Shares [Member]
								Torus Insurance Holdings Limited [Member]
Class of Stock [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Common shares, authorized	'	156,000,000	156,000,000	'	'	111,000,000	111,000,000	'	'	'	'
Common shares, par value	'	$1	$1	'	$132.45	$1	$1	'	'	'	'
Preference shares, authorized	'	45,000,000	45,000,000	'	'	'	'	'	'	'	'
Preference shares, par value	'	$1	$1	'	'	'	'	$1	'	'	'
Voting power of Ordinary Shares, percentage	'	'	'	9.50%	'	'	'	'	'	'	'
Voting power of Ordinary Shares	'	'Each Voting Ordinary Share entitles the holder thereof to one vote. In accordance with the Company's bye-laws, however, any U.S. shareholder or direct foreign shareholder group whose shares constitute 9.5% or more of the voting power of our Voting Ordinary Shares would be entitled to less than one vote for each Voting Ordinary Share held by them.	'	'	'	'	'	'	'	'	'
Aggregate purchase price	$291,600	'	'	'	'	'	'	'	'	'	'
Shares issued	'	'	'	'	'	'	'	4,000,000	665,529	2,725,637	340,820
Exercise price per share	'	'	'	'	'	'	'	'	'	'	$115
Warrants expiration	'	20-Apr-21	'	'	'	'	'	'	'	'	'
Preferred stock liquidation preference	'	$0.00	'	'	'	'	'	'	'	'	'

Share_Capital_Summary_of_Chang

Share Capital - Summary of Changes in Voting Ordinary Shares (Detail) (USD $)	0 Months Ended			12 Months Ended
In Thousands, unless otherwise specified	Apr. 20, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Apr. 20, 2011	Dec. 31, 2013	Dec. 31, 2012	Share Capital - Ordinary Shares [Member]	Share Capital - Ordinary Shares [Member]	Share Capital - Ordinary Shares [Member]
Class of Stock [Line Items]	'	'	'	'	'	'
Balance, beginning of year	'	$1,977,523	$1,775,233	$13,752	$13,665	$12,940
Issue of shares	291,600	'	'	6	43	674
Share awards granted/vested	'	'	'	45	44	51
Balance, beginning and end of year	'	$1,977,523	$1,775,233	$13,803	$13,752	$13,665

Share_Capital_Summary_of_Chang1

Share Capital - Summary of Changes in Non-Voting Convertible Ordinary Shares (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]	'	'	'
Balance, beginning and end of year	$1,977,523	$1,775,233	'
Series A Non-Voting Convertible Ordinary Shares [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Balance, beginning and end of year	2,973	2,973	2,973
Series C Non-Voting Convertible Ordinary Shares [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Balance, beginning and end of year	$2,726	$2,726	'

Earnings_Per_Share_Comparison_

Earnings Per Share - Comparison of Basic and Diluted Earnings Per Share (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Basic earnings per ordinary share:

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

$137,461

$39,987

$19,197

$11,959

$69,906

$47,716

$40,721

$9,674

$128,751

$12,064

$9,375

$3,503

$208,604

$168,017

$153,693

Weighted average ordinary shares outstanding - basic

16,523,369

16,441,461

13,930,221

Net earnings per ordinary share attributable to Enstar Group Limited - basic

$8.32

$2.42

$1.16

$0.72

$4.25

$2.90

$2.48

$0.59

$8.89

$0.85

$0.67

$0.27

$12.62

$10.22

$11.03

Diluted earnings per ordinary share:

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

$137,461

$39,987

$19,197

$11,959

$69,906

$47,716

$40,721

$9,674

$128,751

$12,064

$9,375

$3,503

$208,604

$168,017

$153,693

Weighted average ordinary shares outstanding - basic

16,523,369

16,441,461

13,930,221

Share equivalents:

Unvested shares

117,850

162,454

196,670

Restricted share units

18,056

19,478

69,723

Warrants

44,167

Options

14,628

15,826

Weighted average ordinary shares outstanding - diluted

16,703,442

16,638,021

14,212,440

Net earnings per ordinary share attributable to Enstar Group Limited - diluted

$8.23

$2.39

$1.15

$0.72

$4.22

$2.86

$2.44

$0.58

$8.71

$0.83

$0.66

$0.26

$12.49

$10.10

$10.81

Employee_Benefits_Components_o

Employee Benefits - Components of Salaries and Benefits (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Employee Benefit Plans [Line Items]

Salaries and benefits

$83,563

$63,689

$55,642

Defined contribution pension plan expense

6,023

4,240

4,864

Total salaries and benefits

45,603

29,716

25,687

23,610

30,505

25,138

24,379

20,451

41,818

20,923

16,723

10,382

124,616

100,473

89,846

Equity Incentive Plan [Member]

Employee Benefit Plans [Line Items]

2006 equity plan

2,923

2,894

2,662

Annual Incentive Plan [Member]

Employee Benefit Plans [Line Items]

2006 equity plan

$32,107

$29,650

$26,678

Employee_Benefits_Employee_Sha

Employee Benefits - Employee Share Awards (Detail) (USD $)	12 Months Ended
Employee Benefits - Employee Share Awards (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Nonvested - January 1	$17,989	$20,026	$13,019
Granted	$557	$472	$5,957
Vested	$5,855	$4,736	$1,907
Nonvested - December 31	$15,997	$17,989	$20,026
Nonvested - January 1	160,644	203,930	153,930
Granted	4,959	5,633	71,621
Vested	-50,444	-48,919	-21,621
Nonvested - December 31	115,159	160,644	203,930

Employee_Benefits_Additional_I

Employee Benefits - Additional Information (Detail) (USD $)	12 Months Ended
Employee Benefits - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
2006 Equity Incentive Plan [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]	'	'	'
Total unrecognized compensation cost related to non-vested share awards	$4,700,000	$7,600,000	'
Total unrecognized compensation cost related to non-vested awards, period of recognition	'19 months 18 days	'	'
Compensation costs recognized in earnings	2,900,000	2,800,000	2,700,000
Accrued expense	'	'	26,700,000
2011 Equity Incentive Plan [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]	'	'	'
Total value of share-based awards	'	1,500,000	'
Accrued expense	32,100,000	29,600,000	'
Enstar Group Limited Employee Share Purchase Plan [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]	'	'	'
Compensation costs recognized in earnings	$100,000	$100,000	$100,000
Shares issued to employees	4,959	5,442	5,208
Employees [Member] \| 2006 Equity Incentive Plan [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]	'	'	'
Shares awarded to employees	'	191	16,328

Employee_Benefits_Restricted_S

Employee Benefits - Restricted Share Units - Additional Information (Detail) (Enstar Group Limited Deferred Compensation and Ordinary Share Plan [Member], Non-Employee Directors [Member], USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Enstar Group Limited Deferred Compensation and Ordinary Share Plan [Member] \| Non-Employee Directors [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]	'	'	'
Restricted share units credited to the accounts of non-employee directors	3,566	3,029	4,193
Expenses related to the restricted share units	$0.50	$0.30	$0.40

Employee_Benefits_Pension_Plan

Employee Benefits - Pension Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Pension expense	$6,023,000	$4,240,000	$4,864,000
PWAC Plan [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Pension expense	700,000	800,000	600,000
Unfunded liability	$7,800,000	$13,900,000	'

Taxation_Earnings_before_Incom

Taxation - Earnings before Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Domestic (Bermuda)	$193,063	$30,839	$44,983
Foreign	66,378	204,970	188,759
Total	$259,441	$235,809	$233,742

Taxation_Tax_Expense_Benefit_f

Taxation - Tax Expense (Benefit) for Income Taxes (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Current:

Domestic (Bermuda)

Foreign

30,787

34,704

28,924

Current

30,787

34,704

28,924

Deferred:

Domestic (Bermuda)

Foreign

4,832

9,586

-3,640

Deferred

4,832

9,586

-3,640

Total tax expense

$21,893

$1,340

$4,542

$7,844

$13,943

$14,700

$11,905

$3,742

$19,256

$4,436

$975

$617

$35,619

$44,290

$25,284

Taxation_Additional_Informatio

Taxation - Additional Information (Detail) (USD $)	12 Months Ended
Taxation - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes And Tax Related [Line Items]	'	'	'	'
Effective income tax rate	5.10%	20.80%	19.20%	'
Unrecognized tax benefits	$2,249,000	$5,821,000	$5,621,000	$5,566,000
Unrecognized tax benefits due to the expiration of statutes of limitations	300,000	'	100,000	'
Uncertain tax positions	1,500,000	4,400,000	4,400,000	'
Unrecognized tax benefits, tax positions (decrease)	2,000,000	'	'	'
Accrued interest and penalties related to unrecognized tax benefits	700,000	1,500,000	1,200,000	'
Description of income tax examination	'The Company's operating subsidiaries in specific countries may be subject to audit by various tax authorities and may have different statutes of limitations expiration dates. With limited exceptions, the Company's major subsidiaries that operate in the United States, United Kingdom and Australia are no longer subject to tax examinations for years before 2007, 2010 and 2007, respectively.	'	'	'
Bermuda [Member]	'	'	'	'
Income Taxes And Tax Related [Line Items]	'	'	'	'
Effective income tax rate	0.00%	'	'	'
United Kingdom [Member]	'	'	'	'
Income Taxes And Tax Related [Line Items]	'	'	'	'
Tax loss carryforwards	357,400,000	346,900,000	'	'
Domestic Country [Member]	'	'	'	'
Income Taxes And Tax Related [Line Items]	'	'	'	'
Tax loss carryforwards	$315,000,000	$234,500,000	'	'

Taxation_Reconciliation_of_Ear

Taxation - Reconciliation of Earnings before Income Taxes Computed by Applying Effective Rate (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Income Tax Examination [Line Items]

Earnings before income tax

$164,076

$44,796

$29,740

$20,829

$93,713

$70,192

$52,755

$19,149

$185,578

$26,484

$15,989

$5,691

$259,441

$235,809

$233,742

Expected tax rate

Foreign taxes at local expected rates

5.10%

20.80%

19.20%

Change in uncertain tax positions

-1.00%

0.10%

Change in valuation allowance

7.20%

-3.00%

-8.40%

Other

2.40%

0.90%

-0.80%

Effective tax rate

13.70%

18.80%

10.80%

Australia [Member]

Income Tax Examination [Line Items]

Impact of Australian tax consolidation

0.80%

Taxation_Components_of_Deferre

Taxation - Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets	'	'
Benefit of losses, deductions, and other carryforwards	$187,377	$162,389
Claims reserves, principally due to discounting for tax	217,283	27,195
Allowance for doubtful accounts receivable	22,303	16,703
Investments	'	7,552
Total deferred tax assets	426,963	213,839
Deferred tax liabilities	'	'
Investments	-31,932	-11,999
Unrecognized income	-21,740	'
Intangible asset from acquisition	-18,000	'
Other	-5,424	'
Net deferred tax asset before valuation allowance	349,867	201,840
Valuation allowance	-366,650	-202,365
Net deferred tax liability	$34,295	$8,109

Taxation_Reconciliation_of_Beg

Taxation - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Balance, beginning of year	$5,821	$5,621	$5,566
Gross increases - tax positions related to prior years	114	221	161
Gross decreases - tax positions related to prior years	-3,346	-12	'
Lapse of statute of limitations	-340	-9	-106
Balance, end of year	$2,249	$5,821	$5,621

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

USD ($)

Non-Life Run-Off [Member]

Global Atlantic Financial Group [Member]

Trident Parallel VI Fund [Member]

Trident [Member]

Sound Point Capital [Member]

Goldman Sachs [Member]

Hastings Insurance Group Limited [Member]

USD ($)

Non-Life Run-Off [Member]

Subsequent Event [Member]

USD ($)

Mr. Carey [Member]

USD ($)

Non-Voting Convertible Common Stock [Member]

Subsequent Event [Member]

USD ($)

Maximum [Member]

Investment

GBP (£)

USD ($)

Company

Related Party Transaction [Line Items]

Percentage of Company's ordinary shares acquired

9.70%

Fair value of the investments in funds

$87,700,000

$21,600,000

$3,200,000

Investments of funds affiliated with entities

Indirect ownership interest

4.00%

Net realized and unrealized gains

1,200,000

Future investment in funds

20,000,000

Ordinary shares

22.00%

4.80%

100.00%

Investment in indirect non-voting interests of affiliated companies

12,500,000

Indirect non-voting investments in number of companies

Reinsurance recoverable

1,363,819,000

1,122,919,000

1,298,992,000

1,122,628,000

340,800,000

Reinsurance recoverable secured in a trust account

256,100,000

Reinsurance recoverable major reinsurer

10.00%

Reinsurance recoverable unsecured by trust account

$84,700,000

Retained_Earnings_and_Statutor2

Retained Earnings and Statutory Restrictions - Additional Information (Detail)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

USD ($)

Life and Annuity [Member]

Lloyd's Syndicate [Member]

Bermuda [Member]

U.S. [Member]

Bermuda [Member]

United Kingdom [Member]

Australia [Member]

Europe [Member]

USD ($)

Non-life Run-off / Active Underwriting [Member]

Non-life Run-off [Member]

Subsidiary under Supervision [Member]

Non-life Run-off / Active Underwriting [Member]

Non-life Run-off [Member]

Life and Annuity [Member]

Solvency [Member]

Swiss Solvency Test [Member]

USD ($)

GBP (£)

USD ($)

Non-life Run-off [Member]

USD ($)

Non-life Run-off [Member]

USD ($)

Statutory Accounting Practices [Line Items]

Retained earnings

$1,181,457,000

$972,853,000

Minimum liquidity ratio

0.75

Maximum percentage reduction in total statutory capital without prior approval of Bermuda regulator

15.00%

Minimum solvency requirements

724,300,000

534,700,000

33,300,000

12,000,000

11,000,000

11,700,000

Minimum liquidity requirements

459,100,000

369,400,000

Minimum capital requirements

509,600,000

426,100,000

Total capital commitment

220,200,000

133,000,000

Proceeds from letter of credit

74,000,000

Proceeds from cash on hand

146,200,000

Subsidiaries insurance exceeded

99.50%

Minimum levels of risk-based capital

642,700,000

354,300,000

5,600,000

10,600,000

Reserves for adjusting and other expenses

4,219,905,000

3,650,127,000

47,000,000

Maximum dividend payout

Minimum RBC requirements

104,500,000

Minimum solvency margin

118,100,000

103,900,000

67,400,000

44,900,000

Restricted net assets of consolidated subsidiaries

$732,500,000

$617,200,000

Retained_Earnings_and_Statutor3

Retained Earnings and Statutory Restrictions - Summary of Statutory Capital and Surplus (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Bermuda [Member]	'	'	'
Statutory Accounting Practices [Line Items]	'	'	'
Minimum Required Statutory Capital and Surplus	$109,010	$92,606	'
Actual Statutory Capital and Surplus	833,263	627,335	'
Statutory Income (Loss)	103,852	98,247	80,022
United Kingdom [Member]	'	'	'
Statutory Accounting Practices [Line Items]	'	'	'
Minimum Required Statutory Capital and Surplus	83,410	80,324	'
Actual Statutory Capital and Surplus	592,992	506,459	'
Statutory Income (Loss)	76,685	64,015	114,403
Australia [Member]	'	'	'
Statutory Accounting Practices [Line Items]	'	'	'
Minimum Required Statutory Capital and Surplus	65,894	82,007	'
Actual Statutory Capital and Surplus	99,174	94,042	'
Statutory Income (Loss)	19,131	4,651	13,979
U.S. [Member]	'	'	'
Statutory Accounting Practices [Line Items]	'	'	'
Minimum Required Statutory Capital and Surplus	138,331	102,114	'
Actual Statutory Capital and Surplus	879,947	445,818	'
Statutory Income (Loss)	4,725	-42,109	-8,234
Europe [Member]	'	'	'
Statutory Accounting Practices [Line Items]	'	'	'
Minimum Required Statutory Capital and Surplus	12,965	38,642	'
Actual Statutory Capital and Surplus	142,216	173,974	'
Statutory Income (Loss)	$11,035	$7,578	$22,356

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Custodians	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies [Line Items]	'	'	'
Number of custodians	36	'	'
Rent expense	$5,500,000	$3,900,000	$3,000,000
Total parental guarantees	228,500,000	213,300,000	'
Fixed Maturity Investments [Member]	'	'	'
Commitments And Contingencies [Line Items]	'	'	'
Fair value of fixed maturities investments	2,800,000,000	1,800,000,000	'
Torus Insurance Holdings Limited [Member]	'	'	'
Commitments And Contingencies [Line Items]	'	'	'
Value of equity issued, Business combination	$69,200,000	'	'
Business acquisition, Equity interest issued, Number of shares	2,612,346	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Rental Payments on Non-Cancellable Leases (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
2013	$5,912
2014	4,781
2015	2,759
2016	585
2017	406
2018	309
Total	$14,752

Commitments_and_Contingencies_3

Commitments and Contingencies - Summary of Company's Outstanding Unfunded Investment Commitments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]	'	'
Commitments	$291,000	$251,000
Commitments, Funded	176,760	163,409
Commitments, Unfunded	$114,240	$87,591

Segment_Information_Additional

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
	Segment
Liability for Future Policy Benefit, by Product Segment [Line Items]	'
Number of reportable segments	3
Pavonia [Member]	'
Liability for Future Policy Benefit, by Product Segment [Line Items]	'
Business acquisition, Date of acquisition	31-Mar-13
Arden [Member]	'
Liability for Future Policy Benefit, by Product Segment [Line Items]	'
Business acquisition, Date of acquisition	9-Sep-13
Atrium [Member]	'
Liability for Future Policy Benefit, by Product Segment [Line Items]	'
Business acquisition, Date of acquisition	25-Nov-13

Segment_Information_Summary_of

Segment Information - Summary of Company's Assets by Segment (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total assets	$8,620,155	$5,878,261
Non-Life Run-Off [Member]	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total assets	6,619,992	5,825,402
Life and Annuity [Member]	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total assets	1,414,987	52,859
Active Underwriting [Member]	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total assets	$585,176	'

Segment_Information_Summary_of1

Segment Information - Summary of Operations by Segment (Detail) (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Segment Reporting Information [Line Items]

Net premiums earned

$239,807,000

$3,511,000

$3,543,000

Fees and commission income

5,012,000

2,398,000

2,960,000

2,447,000

2,657,000

1,944,000

1,775,000

2,194,000

10,154,000

1,623,000

2,045,000

4,036,000

12,817,000

8,570,000

17,858,000

Net investment income

23,071,000

25,009,000

27,252,000

17,963,000

16,765,000

19,658,000

20,894,000

20,443,000

15,571,000

18,498,000

19,059,000

15,548,000

93,295,000

77,760,000

68,676,000

Net realized and unrealized gains (losses)

31,440,000

37,010,000

-27,919,000

30,120,000

18,259,000

28,280,000

1,691,000

25,382,000

2,231,000

-8,512,000

9,133,000

6,362,000

70,651,000

73,612,000

9,214,000

Gain on bargain purchase

13,105,000

Total income

133,399,000

123,091,000

77,889,000

82,191,000

38,500,000

50,704,000

25,256,000

48,993,000

29,036,000

12,801,000

31,508,000

39,051,000

416,570,000

163,453,000

112,396,000

Net reduction in ultimate losses and loss adjustment expense liabilities:

Losses incurred on current period premiums earned - non-life run-off

74,139,000

Losses incurred - active underwriting

19,352,000

Reduction in estimates of net ultimate losses

-134,068,000

-27,850,000

-48,500,000

-5,062,000

-97,895,000

-58,506,000

-58,417,000

-3,298,000

-173,924,000

-43,615,000

-28,079,000

-2,612,000

-215,480,000

-218,116,000

-248,230,000

Increase (reduction) in provisions for bad debt

7,464,000

-5,465,000

-329,000

-527,000

-2,255,000

-38,751,000

-2,399,000

-1,672,000

1,999,000

-3,111,000

-42,822,000

Reduction in provisions for unallocated loss adjustment expense liabilities

-111,000

-16,320,000

-16,795,000

-16,403,000

-2,206,000

-12,579,000

-11,661,000

-12,852,000

-7,669,000

-14,113,000

-11,783,000

-11,537,000

-49,629,000

-39,298,000

-45,102,000

Amortization of fair value adjustments

-3,540,000

5,025,000

2,369,000

2,093,000

4,207,000

8,538,000

2,240,000

7,587,000

16,782,000

8,865,000

6,969,000

10,077,000

5,947,000

22,572,000

42,693,000

Total net reduction in ultimate losses and loss adjustment expense liabilities

-125,056,000

-20,374,000

-27,403,000

9,161,000

-96,223,000

-62,547,000

-68,365,000

-10,818,000

-203,562,000

-51,262,000

-34,565,000

-4,072,000

-163,672,000

-237,953,000

-293,461,000

Life and annuity policy benefits

20,970,000

31,081,000

25,562,000

741,000

-2,992,000

822,000

896,000

974,000

-2,304,000

2,340,000

1,521,000

78,354,000

-300,000

1,557,000

Acquisition costs

5,050,000

6,149,000

9,613,000

2,387,000

23,199,000

Salaries and benefits

45,603,000

29,716,000

25,687,000

23,610,000

30,505,000

25,138,000

24,379,000

20,451,000

41,818,000

20,923,000

16,723,000

10,382,000

124,616,000

100,473,000

89,846,000

General and administrative expenses

19,538,000

29,126,000

20,002,000

17,946,000

13,169,000

14,409,000

14,156,000

14,858,000

5,090,000

20,759,000

28,211,000

17,750,000

86,612,000

56,592,000

71,810,000

Interest expense

3,593,000

3,270,000

3,091,000

2,435,000

2,540,000

1,713,000

2,062,000

2,111,000

2,431,000

2,435,000

1,697,000

1,966,000

12,389,000

8,426,000

8,529,000

Net foreign exchange (gains) losses

-375,000

-673,000

-8,403,000

5,082,000

-2,212,000

977,000

-627,000

2,268,000

-15,000

-8,878,000

1,932,000

7,334,000

-4,369,000

406,000

373,000

Total Expenses

-22,677,000

78,295,000

48,149,000

61,362,000

-55,213,000

-19,488,000

-27,499,000

29,844,000

-156,542,000

-13,683,000

15,519,000

33,360,000

157,129,000

-72,356,000

-121,346,000

EARNINGS BEFORE INCOME TAXES

164,076,000

44,796,000

29,740,000

20,829,000

93,713,000

70,192,000

52,755,000

19,149,000

185,578,000

26,484,000

15,989,000

5,691,000

259,441,000

235,809,000

233,742,000

INCOME TAXES

-21,893,000

-1,340,000

-4,542,000

-7,844,000

-13,943,000

-14,700,000

-11,905,000

-3,742,000

-19,256,000

-4,436,000

-975,000

-617,000

-35,619,000

-44,290,000

-25,284,000

NET EARNINGS

142,183,000

43,456,000

25,198,000

12,985,000

79,770,000

55,492,000

40,850,000

15,407,000

166,322,000

22,048,000

15,014,000

5,074,000

223,822,000

191,519,000

208,458,000

Less: Net earnings attributable to noncontrolling interest

-4,722,000

-3,469,000

-6,001,000

-1,026,000

-9,864,000

-7,776,000

-129,000

-5,733,000

-37,571,000

-9,984,000

-5,639,000

-1,571,000

-15,218,000

-23,502,000

-54,765,000

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

137,461,000

39,987,000

19,197,000

11,959,000

69,906,000

47,716,000

40,721,000

9,674,000

128,751,000

12,064,000

9,375,000

3,503,000

208,604,000

168,017,000

153,693,000

Operating Segments [Member] | Non-Life Run-Off [Member]

Segment Reporting Information [Line Items]

Net premiums earned

112,611,000

Fees and commission income

12,785,000

9,283,000

17,858,000

Net investment income

64,048,000

76,813,000

66,556,000

Net realized and unrealized gains (losses)

79,368,000

71,730,000

8,553,000

Gain on bargain purchase

Total income

268,812,000

157,826,000

92,967,000

Net reduction in ultimate losses and loss adjustment expense liabilities:

Losses incurred on current period premiums earned - non-life run-off

74,139,000

Losses incurred - active underwriting

Reduction in estimates of net ultimate losses

-215,480,000

-218,116,000

-248,230,000

Increase (reduction) in provisions for bad debt

1,999,000

-3,111,000

-42,822,000

Reduction in provisions for unallocated loss adjustment expense liabilities

-49,580,000

-39,298,000

-45,102,000

Amortization of fair value adjustments

5,947,000

22,572,000

42,693,000

Total net reduction in ultimate losses and loss adjustment expense liabilities

-182,975,000

-237,953,000

-293,461,000

Life and annuity policy benefits

Acquisition costs

14,379,000

Salaries and benefits

117,141,000

99,342,000

89,440,000

General and administrative expenses

67,979,000

55,731,000

70,841,000

Interest expense

12,057,000

8,426,000

8,529,000

Net foreign exchange (gains) losses

-5,909,000

644,000

1,190,000

Total Expenses

22,672,000

-73,810,000

-123,461,000

EARNINGS BEFORE INCOME TAXES

246,140,000

231,636,000

216,428,000

INCOME TAXES

-34,191,000

-44,266,000

-25,311,000

NET EARNINGS

211,949,000

187,370,000

191,117,000

Less: Net earnings attributable to noncontrolling interest

-12,076,000

-23,502,000

-54,765,000

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

199,873,000

163,868,000

136,352,000

Operating Segments [Member] | Life and Annuity [Member]

Segment Reporting Information [Line Items]

Net premiums earned

94,984,000

3,511,000

3,543,000

Fees and commission income

Net investment income

30,182,000

947,000

2,120,000

Net realized and unrealized gains (losses)

-9,259,000

1,882,000

661,000

Gain on bargain purchase

13,105,000

Total income

115,907,000

6,340,000

19,429,000

Net reduction in ultimate losses and loss adjustment expense liabilities:

Losses incurred on current period premiums earned - non-life run-off

Losses incurred - active underwriting

Reduction in estimates of net ultimate losses

Increase (reduction) in provisions for bad debt

Reduction in provisions for unallocated loss adjustment expense liabilities

Amortization of fair value adjustments

Total net reduction in ultimate losses and loss adjustment expense liabilities

Life and annuity policy benefits

78,354,000

-300,000

1,557,000

Acquisition costs

8,820,000

Salaries and benefits

4,799,000

1,131,000

406,000

General and administrative expenses

16,039,000

1,574,000

969,000

Interest expense

1,456,000

Net foreign exchange (gains) losses

158,000

-238,000

-817,000

Total Expenses

109,626,000

2,167,000

2,115,000

EARNINGS BEFORE INCOME TAXES

6,281,000

4,173,000

17,314,000

INCOME TAXES

-1,243,000

-24,000

27,000

NET EARNINGS

5,038,000

4,149,000

17,341,000

Less: Net earnings attributable to noncontrolling interest

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

5,038,000

4,149,000

17,341,000

Operating Segments [Member] | Active Underwriting [Member]

Segment Reporting Information [Line Items]

Net premiums earned

32,212,000

Fees and commission income

2,708,000

Net investment income

521,000

Net realized and unrealized gains (losses)

542,000

Total income

35,983,000

Net reduction in ultimate losses and loss adjustment expense liabilities:

Losses incurred on current period premiums earned - non-life run-off

Losses incurred - active underwriting

19,352,000

Reduction in estimates of net ultimate losses

Increase (reduction) in provisions for bad debt

Reduction in provisions for unallocated loss adjustment expense liabilities

-49,000

Amortization of fair value adjustments

Total net reduction in ultimate losses and loss adjustment expense liabilities

19,303,000

Life and annuity policy benefits

Acquisition costs

Salaries and benefits

2,676,000

General and administrative expenses

5,270,000

Interest expense

332,000

Net foreign exchange (gains) losses

1,382,000

Total Expenses

28,963,000

EARNINGS BEFORE INCOME TAXES

7,020,000

INCOME TAXES

-185,000

NET EARNINGS

6,835,000

Less: Net earnings attributable to noncontrolling interest

-3,142,000

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

3,693,000

Eliminations [Member]

Segment Reporting Information [Line Items]

Net premiums earned

Fees and commission income

-2,676,000

-713,000

Net investment income

-1,456,000

Net realized and unrealized gains (losses)

Total income

-4,132,000

-713,000

Net reduction in ultimate losses and loss adjustment expense liabilities:

Losses incurred on current period premiums earned - non-life run-off

Losses incurred - active underwriting

Reduction in estimates of net ultimate losses

Increase (reduction) in provisions for bad debt

Reduction in provisions for unallocated loss adjustment expense liabilities

Amortization of fair value adjustments

Total net reduction in ultimate losses and loss adjustment expense liabilities

Life and annuity policy benefits

Acquisition costs

Salaries and benefits

General and administrative expenses

-2,676,000

-713,000

Interest expense

-1,456,000

Net foreign exchange (gains) losses

Total Expenses

-4,132,000

-713,000

EARNINGS BEFORE INCOME TAXES

INCOME TAXES

NET EARNINGS

Less: Net earnings attributable to noncontrolling interest

NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED

Condensed_Unaudited_Quarterly_2

Condensed Unaudited Quarterly Financial Data - Condensed Unaudited Quarterly Financial Data (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Parent Company Only Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	'	'	'	'	'	'	'	'	'	'	'	'	$239,807,000	$3,511,000	$3,543,000
Fees and commission income	5,012,000	2,398,000	2,960,000	2,447,000	2,657,000	1,944,000	1,775,000	2,194,000	10,154,000	1,623,000	2,045,000	4,036,000	12,817,000	8,570,000	17,858,000
Net investment income	23,071,000	25,009,000	27,252,000	17,963,000	16,765,000	19,658,000	20,894,000	20,443,000	15,571,000	18,498,000	19,059,000	15,548,000	93,295,000	77,760,000	68,676,000
Net realized and unrealized gains (losses)	31,440,000	37,010,000	-27,919,000	30,120,000	18,259,000	28,280,000	1,691,000	25,382,000	2,231,000	-8,512,000	9,133,000	6,362,000	70,651,000	73,612,000	9,214,000
Gain on bargain purchase	'	'	'	'	'	'	'	'	'	'	'	13,105,000	'	'	13,105,000
Total income	133,399,000	123,091,000	77,889,000	82,191,000	38,500,000	50,704,000	25,256,000	48,993,000	29,036,000	12,801,000	31,508,000	39,051,000	416,570,000	163,453,000	112,396,000
Net (reduction) increase in ultimate losses and loss adjustment expense liabilities:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Losses incurred on current period premiums earned -non-life run-off	'	'	'	'	'	'	'	'	'	'	'	'	74,139,000	'	'
Losses incurred - active underwriting	'	'	'	'	'	'	'	'	'	'	'	'	19,352,000	'	'
Reduction in estimates of net ultimate losses	-134,068,000	-27,850,000	-48,500,000	-5,062,000	-97,895,000	-58,506,000	-58,417,000	-3,298,000	-173,924,000	-43,615,000	-28,079,000	-2,612,000	-215,480,000	-218,116,000	-248,230,000
Increase (reduction) in provisions for bad debt	7,464,000	-5,465,000	'	'	-329,000	'	-527,000	-2,255,000	-38,751,000	-2,399,000	-1,672,000	'	1,999,000	-3,111,000	-42,822,000
Reduction in provisions for unallocated loss adjustment expense liabilities	-111,000	-16,320,000	-16,795,000	-16,403,000	-2,206,000	-12,579,000	-11,661,000	-12,852,000	-7,669,000	-14,113,000	-11,783,000	-11,537,000	-49,629,000	-39,298,000	-45,102,000
Amortization of fair value adjustments	-3,540,000	5,025,000	2,369,000	2,093,000	4,207,000	8,538,000	2,240,000	7,587,000	16,782,000	8,865,000	6,969,000	10,077,000	5,947,000	22,572,000	42,693,000
Total net reduction in ultimate losses and loss adjustment expense liabilities	-125,056,000	-20,374,000	-27,403,000	9,161,000	-96,223,000	-62,547,000	-68,365,000	-10,818,000	-203,562,000	-51,262,000	-34,565,000	-4,072,000	-163,672,000	-237,953,000	-293,461,000
Life and annuity policy benefits	20,970,000	31,081,000	25,562,000	741,000	-2,992,000	822,000	896,000	974,000	-2,304,000	2,340,000	1,521,000	'	78,354,000	-300,000	1,557,000
Acquisition costs	5,050,000	6,149,000	9,613,000	2,387,000	'	'	'	'	'	'	'	'	23,199,000	'	'
Salaries and benefits	45,603,000	29,716,000	25,687,000	23,610,000	30,505,000	25,138,000	24,379,000	20,451,000	41,818,000	20,923,000	16,723,000	10,382,000	124,616,000	100,473,000	89,846,000
General and administrative expenses	19,538,000	29,126,000	20,002,000	17,946,000	13,169,000	14,409,000	14,156,000	14,858,000	5,090,000	20,759,000	28,211,000	17,750,000	86,612,000	56,592,000	71,810,000
Interest expense	3,593,000	3,270,000	3,091,000	2,435,000	2,540,000	1,713,000	2,062,000	2,111,000	2,431,000	2,435,000	1,697,000	1,966,000	12,389,000	8,426,000	8,529,000
Net foreign exchange (gains) losses	-375,000	-673,000	-8,403,000	5,082,000	-2,212,000	977,000	-627,000	2,268,000	-15,000	-8,878,000	1,932,000	7,334,000	-4,369,000	406,000	373,000
Total Expenses	-22,677,000	78,295,000	48,149,000	61,362,000	-55,213,000	-19,488,000	-27,499,000	29,844,000	-156,542,000	-13,683,000	15,519,000	33,360,000	157,129,000	-72,356,000	-121,346,000
EARNINGS BEFORE INCOME TAXES	164,076,000	44,796,000	29,740,000	20,829,000	93,713,000	70,192,000	52,755,000	19,149,000	185,578,000	26,484,000	15,989,000	5,691,000	259,441,000	235,809,000	233,742,000
INCOME TAXES	-21,893,000	-1,340,000	-4,542,000	-7,844,000	-13,943,000	-14,700,000	-11,905,000	-3,742,000	-19,256,000	-4,436,000	-975,000	-617,000	-35,619,000	-44,290,000	-25,284,000
NET EARNINGS	142,183,000	43,456,000	25,198,000	12,985,000	79,770,000	55,492,000	40,850,000	15,407,000	166,322,000	22,048,000	15,014,000	5,074,000	223,822,000	191,519,000	208,458,000
Less: Net earnings attributable to noncontrolling interest	-4,722,000	-3,469,000	-6,001,000	-1,026,000	-9,864,000	-7,776,000	-129,000	-5,733,000	-37,571,000	-9,984,000	-5,639,000	-1,571,000	-15,218,000	-23,502,000	-54,765,000
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	137,461,000	39,987,000	19,197,000	11,959,000	69,906,000	47,716,000	40,721,000	9,674,000	128,751,000	12,064,000	9,375,000	3,503,000	208,604,000	168,017,000	153,693,000
EARNINGS PER SHARE - BASIC:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net earnings per ordinary share attributable to Enstar Group Limited shareholders	$8.32	$2.42	$1.16	$0.72	$4.25	$2.90	$2.48	$0.59	$8.89	$0.85	$0.67	$0.27	$12.62	$10.22	$11.03
EARNINGS PER SHARE - DILUTED:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net earnings per ordinary share attributable to Enstar Group Limited shareholders	$8.23	$2.39	$1.15	$0.72	$4.22	$2.86	$2.44	$0.58	$8.71	$0.83	$0.66	$0.26	$12.49	$10.10	$10.81
Non-Life Run-Off [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Parent Company Only Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	12,341,000	28,134,000	41,216,000	30,920,000	'	'	'	'	'	'	'	'	112,611,000	'	'
Net (reduction) increase in ultimate losses and loss adjustment expense liabilities:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Losses incurred on current period premiums earned -non-life run-off	-14,153,000	24,236,000	35,523,000	28,533,000	'	'	'	'	'	'	'	'	74,139,000	'	'
Life and Annuity [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Parent Company Only Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	29,323,000	30,540,000	34,380,000	741,000	819,000	822,000	896,000	974,000	1,080,000	1,192,000	1,271,000	'	94,984,000	3,511,000	3,543,000
Active Underwriting [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Parent Company Only Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net premiums earned	32,212,000	'	'	'	'	'	'	'	'	'	'	'	32,212,000	'	'
Net (reduction) increase in ultimate losses and loss adjustment expense liabilities:	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Losses incurred on current period premiums earned -non-life run-off	'	'	'	'	'	'	'	'	'	'	'	'	-19,303,000	'	'
Losses incurred - active underwriting	19,352,000	'	'	'	'	'	'	'	'	'	'	'	19,352,000	'	'
Reduction in estimates of net ultimate losses	'	'	'	'	'	'	'	'	'	'	'	'	19,352,000	'	'
Reduction in provisions for unallocated loss adjustment expense liabilities	'	'	'	'	'	'	'	'	'	'	'	'	-49,000	'	'
Total net reduction in ultimate losses and loss adjustment expense liabilities	'	'	'	'	'	'	'	'	'	'	'	'	$19,303,000	'	'

Schedule_I_Summary_of_Investme1

Schedule I - Summary of Investments Other Than Investments in Related Parties (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Fair Value	$5,459,970
Amount at which shown in the balance sheet	5,519,798
Equities - U.S. [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	156,686
Fair Value	182,033
Amount at which shown in the balance sheet	182,033
Other Investments [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Fair Value	569,293
Amount at which shown in the balance sheet	569,293
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	3,653,739
Fair Value	3,662,721
Amount at which shown in the balance sheet	3,662,721
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| U.S. Government and Agency [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	440,148
Fair Value	439,946
Amount at which shown in the balance sheet	439,946
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Non-U.S. Government [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	469,281
Fair Value	476,224
Amount at which shown in the balance sheet	476,224
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Corporate [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	2,121,013
Fair Value	2,123,675
Amount at which shown in the balance sheet	2,123,675
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Municipal [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	40,889
Fair Value	41,034
Amount at which shown in the balance sheet	41,034
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Residential Mortgage-Backed [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	219,461
Fair Value	218,457
Amount at which shown in the balance sheet	218,457
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Commercial Mortgage-Backed [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	115,351
Fair Value	114,637
Amount at which shown in the balance sheet	114,637
Trading Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Asset-Backed [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	247,596
Fair Value	248,748
Amount at which shown in the balance sheet	248,748
Held-to-maturity Securities [Member] \| Fixed Maturity Securities [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	859,387
Fair Value	799,559
Amount at which shown in the balance sheet	859,387
Held-to-maturity Securities [Member] \| Fixed Maturity Securities [Member] \| U.S. Government and Agency [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	19,992
Fair Value	18,132
Amount at which shown in the balance sheet	19,992
Held-to-maturity Securities [Member] \| Fixed Maturity Securities [Member] \| Non-U.S. Government [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	23,592
Fair Value	22,327
Amount at which shown in the balance sheet	23,592
Held-to-maturity Securities [Member] \| Fixed Maturity Securities [Member] \| Corporate [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	815,803
Fair Value	759,100
Amount at which shown in the balance sheet	815,803
Available-for-sale Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	243,302
Fair Value	246,364
Amount at which shown in the balance sheet	246,364
Available-for-sale Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| U.S. Government and Agency [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	28,050
Fair Value	28,343
Amount at which shown in the balance sheet	28,343
Available-for-sale Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Non-U.S. Government [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	84,443
Fair Value	86,292
Amount at which shown in the balance sheet	86,292
Available-for-sale Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Corporate [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	76,942
Fair Value	77,904
Amount at which shown in the balance sheet	77,904
Available-for-sale Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Residential Mortgage-Backed [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	17,523
Fair Value	17,507
Amount at which shown in the balance sheet	17,507
Available-for-sale Securities [Member] \| Fixed Maturity Securities and Short Term Investments [Member] \| Asset-Backed [Member]	'
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]	'
Amortized Cost	36,344
Fair Value	36,318
Amount at which shown in the balance sheet	$36,318

Schedule_II_Condensed_Balance_

Schedule II - Condensed Balance Sheets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ASSETS	'	'	'	'
Cash and cash equivalents	$643,841	$654,890	$850,474	$799,154
TOTAL ASSETS	8,620,155	5,878,261	'	'
LIABILITIES	'	'	'	'
Accounts payable and accrued liabilities	97,103	73,258	'	'
Loans payable	452,446	107,430	'	'
TOTAL LIABILITIES	6,541,773	4,103,028	'	'
COMMITMENTS AND CONTINGENCIES	'	'	'	'
SHAREHOLDERS' EQUITY	'	'	'	'
Treasury stock at cost (Series A non-voting convertible ordinary shares 2012: 2,972,892; 2011: 2,972,892)	-421,559	-421,559	'	'
Additional paid-in capital	962,145	958,571	'	'
Accumulated other comprehensive income	13,978	24,439	'	'
Retained earnings	1,181,457	972,853	'	'
TOTAL SHAREHOLDERS' EQUITY	1,755,523	1,553,755	'	'
TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND SHAREHOLDERS' EQUITY	8,620,155	5,878,261	'	'
Series A Non-Voting Convertible Ordinary Shares [Member]	'	'	'	'
SHAREHOLDERS' EQUITY	'	'	'	'
Ordinary shares	2,973	2,973	'	'
Enstar Group Limited [Member]	'	'	'	'
ASSETS	'	'	'	'
Cash and cash equivalents	27,989	180,810	171,322	25,498
Balances due from subsidiaries	363,113	308,364	'	'
Investments in subsidiaries	1,654,508	1,367,286	'	'
Accounts receivable and other assets	306	294	'	'
TOTAL ASSETS	2,045,916	1,856,754	'	'
LIABILITIES	'	'	'	'
Accounts payable and accrued liabilities	1,761	3,757	'	'
Loans payable	143,258	138	'	'
Balances due to subsidiaries	145,374	299,104	'	'
TOTAL LIABILITIES	290,393	302,999	'	'
COMMITMENTS AND CONTINGENCIES	'	'	'	'
SHAREHOLDERS' EQUITY	'	'	'	'
Treasury stock at cost (Series A non-voting convertible ordinary shares 2012: 2,972,892; 2011: 2,972,892)	-421,559	-421,559	'	'
Additional paid-in capital	962,145	958,571	'	'
Accumulated other comprehensive income	13,978	24,439	'	'
Retained earnings	1,181,457	972,853	'	'
TOTAL SHAREHOLDERS' EQUITY	1,755,523	1,553,755	'	'
TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND SHAREHOLDERS' EQUITY	2,045,916	1,856,754	'	'
Enstar Group Limited [Member] \| Share Capital - Ordinary Shares [Member]	'	'	'	'
SHAREHOLDERS' EQUITY	'	'	'	'
Ordinary shares	13,803	13,752	'	'
Enstar Group Limited [Member] \| Series A Non-Voting Convertible Ordinary Shares [Member]	'	'	'	'
SHAREHOLDERS' EQUITY	'	'	'	'
Ordinary shares	2,973	2,973	'	'
Enstar Group Limited [Member] \| Series B, C and D Non-Voting Convertible Ordinary Shares [Member]	'	'	'	'
SHAREHOLDERS' EQUITY	'	'	'	'
Ordinary shares	$2,726	$2,726	'	'

Schedule_II_Condensed_Balance_1

Schedule II - Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]	'	'
Common shares, authorized	156,000,000	156,000,000
Common shares, par value	$1	$1
Series A Non-Voting Convertible Ordinary Shares [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Ordinary shares, shares issued	2,972,892	2,972,892
Treasury shares at cost (Series A non-voting convertible ordinary shares)	2,972,892	2,972,892
Enstar Group Limited [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Treasury shares at cost (Series A non-voting convertible ordinary shares)	2,972,892	2,972,892
Enstar Group Limited [Member] \| Share Capital - Ordinary Shares [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Common shares, authorized	156,000,000	156,000,000
Common shares, par value	$1	$1
Ordinary shares, shares issued	13,802,706	13,752,172
Enstar Group Limited [Member] \| Series A Non-Voting Convertible Ordinary Shares [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Ordinary shares, shares issued	2,972,892	2,972,892
Enstar Group Limited [Member] \| Series B, C and D Non-Voting Convertible Ordinary Shares [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Ordinary shares, shares issued	2,725,637	2,725,637
Ordinary shares, shares outstanding	2,725,637	2,725,637

Schedule_II_Condensed_Statemen

Schedule II - Condensed Statements of Earnings (Detail) (USD $)	3 Months Ended												12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net investment income	$23,071	$25,009	$27,252	$17,963	$16,765	$19,658	$20,894	$20,443	$15,571	$18,498	$19,059	$15,548	$93,295	$77,760	$68,676
Total income	133,399	123,091	77,889	82,191	38,500	50,704	25,256	48,993	29,036	12,801	31,508	39,051	416,570	163,453	112,396
EXPENSES	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Salaries and benefits	45,603	29,716	25,687	23,610	30,505	25,138	24,379	20,451	41,818	20,923	16,723	10,382	124,616	100,473	89,846
General and administrative expenses	19,538	29,126	20,002	17,946	13,169	14,409	14,156	14,858	5,090	20,759	28,211	17,750	86,612	56,592	71,810
Interest expense	3,593	3,270	3,091	2,435	2,540	1,713	2,062	2,111	2,431	2,435	1,697	1,966	12,389	8,426	8,529
Net foreign exchange (gains) losses	-375	-673	-8,403	5,082	-2,212	977	-627	2,268	-15	-8,878	1,932	7,334	-4,369	406	373
Total expenses	-22,677	78,295	48,149	61,362	-55,213	-19,488	-27,499	29,844	-156,542	-13,683	15,519	33,360	157,129	-72,356	-121,346
EARNINGS (LOSS) BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES	164,076	44,796	29,740	20,829	93,713	70,192	52,755	19,149	185,578	26,484	15,989	5,691	259,441	235,809	233,742
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	137,461	39,987	19,197	11,959	69,906	47,716	40,721	9,674	128,751	12,064	9,375	3,503	208,604	168,017	153,693
Enstar Group Limited [Member]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
INCOME	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net investment income	'	'	'	'	'	'	'	'	'	'	'	'	8,561	8,365	3,928
Dividend income from subsidiaries	'	'	'	'	'	'	'	'	'	'	'	'	27,118	92,450	18,900
Total income	'	'	'	'	'	'	'	'	'	'	'	'	35,679	100,815	22,828
EXPENSES	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Salaries and benefits	'	'	'	'	'	'	'	'	'	'	'	'	117	1,179	2,738
General and administrative expenses	'	'	'	'	'	'	'	'	'	'	'	'	15,747	3,816	17,566
Interest expense	'	'	'	'	'	'	'	'	'	'	'	'	10,475	11,505	9,813
Net foreign exchange (gains) losses	'	'	'	'	'	'	'	'	'	'	'	'	-1,696	942	-29
Total expenses	'	'	'	'	'	'	'	'	'	'	'	'	24,643	17,442	30,088
EARNINGS (LOSS) BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES	'	'	'	'	'	'	'	'	'	'	'	'	11,036	83,373	-7,260
EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARIES	'	'	'	'	'	'	'	'	'	'	'	'	197,568	84,644	160,953
NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED	'	'	'	'	'	'	'	'	'	'	'	'	$208,604	$168,017	$153,693

Schedule_II_Condensed_Statemen1

Schedule II - Condensed Statements of Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES:	'	'	'
Net cash flows used in operating activities	($62,387)	($187,350)	($909,920)
FINANCING ACTIVITIES:	'	'	'
Repayment of loans	-39,505	-134,541	-277,458
Receipt of loans	369,800	'	274,150
Net cash flows provided by (used in) financing activities	423,076	-233,773	259,769
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-11,049	-195,584	51,320
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	654,890	850,474	799,154
CASH AND CASH EQUIVALENTS, END OF YEAR	643,841	654,890	850,474
Enstar Group Limited [Member]	'	'	'
OPERATING ACTIVITIES:	'	'	'
Net cash flows used in operating activities	-174,868	-26,926	-142,600
INVESTING ACTIVITIES:	'	'	'
Return of capital, net	-72,953	100,516	18,839
FINANCING ACTIVITIES:	'	'	'
Repayment of loans	'	-64,102	-185,442
Receipt of loans	95,000	'	167,650
Proceeds from issuance of ordinary shares	'	'	287,377
Net cash flows provided by (used in) financing activities	95,000	-64,102	269,585
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-152,821	9,488	145,824
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	180,810	171,322	25,498
CASH AND CASH EQUIVALENTS, END OF YEAR	$27,989	$180,810	$171,322

Schedule_III_Supplementary_Ins1

Schedule III - Supplementary Insurance Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplementary Insurance Information, by Segment [Line Items]	'	'	'
Supplementary Insurance Information, Deferred Acquisition Costs	$16,744	'	'
Supplementary Insurance Information, Reserves for Losses and Loss Adjustment Expenses	4,219,905	3,650,127	4,272,081
Supplementary Insurance Information, Unearned Premiums	70,697	'	'
Supplementary Insurance Information, Other Benefits Payable	1,273,100	11,027	10,835
Supplementary Insurance Information, Net Premiums Earned	239,807	3,511	3,543
Supplementary Insurance Information, Net Investment Income	93,295	77,760	68,676
Supplementary Insurance Information, Losses and Loss Expenses and Policy Benefits	-85,318	-238,253	-291,904
Supplementary Insurance Information, Amortization of Deferred Acquisition Costs	23,199	'	'
Supplementary Insurance Information, Other Operating Expenses	219,248	165,897	170,558
Supplementary Insurance Information, Net Premiums Written	103,193	3,511	3,543
Non-life Run-off [Member]	'	'	'
Supplementary Insurance Information, by Segment [Line Items]	'	'	'
Supplementary Insurance Information, Reserves for Losses and Loss Adjustment Expenses	4,004,513	3,650,127	4,272,081
Supplementary Insurance Information, Unearned Premiums	1,199	'	'
Supplementary Insurance Information, Net Premiums Earned	112,611	'	'
Supplementary Insurance Information, Net Investment Income	64,048	76,813	66,556
Supplementary Insurance Information, Losses and Loss Expenses and Policy Benefits	-182,975	-237,953	-293,461
Supplementary Insurance Information, Amortization of Deferred Acquisition Costs	14,379	'	'
Supplementary Insurance Information, Other Operating Expenses	191,268	164,143	170,000
Supplementary Insurance Information, Net Premiums Written	9,233	'	'
Life and Annuity [Member]	'	'	'
Supplementary Insurance Information, by Segment [Line Items]	'	'	'
Supplementary Insurance Information, Unearned Premiums	3,694	'	'
Supplementary Insurance Information, Other Benefits Payable	1,273,100	11,027	10,835
Supplementary Insurance Information, Net Premiums Earned	94,984	3,511	3,543
Supplementary Insurance Information, Net Investment Income	30,182	947	2,120
Supplementary Insurance Information, Losses and Loss Expenses and Policy Benefits	78,354	-300	1,557
Supplementary Insurance Information, Amortization of Deferred Acquisition Costs	8,820	'	'
Supplementary Insurance Information, Other Operating Expenses	22,452	2,467	558
Supplementary Insurance Information, Net Premiums Written	63,856	3,511	3,543
Active Underwriting [Member]	'	'	'
Supplementary Insurance Information, by Segment [Line Items]	'	'	'
Supplementary Insurance Information, Deferred Acquisition Costs	16,744	'	'
Supplementary Insurance Information, Reserves for Losses and Loss Adjustment Expenses	215,392	'	'
Supplementary Insurance Information, Unearned Premiums	65,804	'	'
Supplementary Insurance Information, Net Premiums Earned	32,212	'	'
Supplementary Insurance Information, Net Investment Income	521	'	'
Supplementary Insurance Information, Losses and Loss Expenses and Policy Benefits	19,303	'	'
Supplementary Insurance Information, Other Operating Expenses	9,660	'	'
Supplementary Insurance Information, Net Premiums Written	30,104	'	'
Eliminations [Member]	'	'	'
Supplementary Insurance Information, by Segment [Line Items]	'	'	'
Supplementary Insurance Information, Net Investment Income	-1,456	'	'
Supplementary Insurance Information, Other Operating Expenses	($4,132)	($713)	'

Schedule_IV_Reinsurance_Detail

Schedule IV - Reinsurance (Detail) (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]

Reinsurance Effect on Claims and Benefits Incurred, Gross

$221,933,000

$5,421,000

$5,240,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded to other companies

19,782,000

1,910,000

1,697,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Assumed from other companies

37,656,000

Reinsurance Effect on Claims and Benefits Incurred, Net

239,807,000

3,511,000

3,543,000

Life Reinsurance in Force [Member]

Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]

Reinsurance Effect on Claims and Benefits Incurred, Gross

21,508,144,000

1,330,219,000

1,570,040,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded to other companies

3,824,429,000

1,191,886,000

1,406,867,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Assumed from other companies

80,681,000

Reinsurance Effect on Claims and Benefits Incurred, Net

17,764,396,000

138,333,000

163,173,000

Reinsurance Premiums for Insurance Companies, Percentage of Amount Assumed to Net

0.50%

0.00%

Property and Casualty [Member]

Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]

Reinsurance Effect on Claims and Benefits Incurred, Gross

134,402,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded to other companies

11,651,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Assumed from other companies

22,072,000

Reinsurance Effect on Claims and Benefits Incurred, Net

144,823,000

Reinsurance Premiums for Insurance Companies, Percentage of Amount Assumed to Net

15.20%

0.00%

Life and Annuity [Member]

Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]

Reinsurance Effect on Claims and Benefits Incurred, Gross

87,531,000

5,421,000

5,240,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded to other companies

8,131,000

1,910,000

1,697,000

Reinsurance Effect on Claims and Benefits Incurred, Amount Assumed from other companies

15,584,000

Reinsurance Effect on Claims and Benefits Incurred, Net

$29,323,000

$30,540,000

$34,380,000

$741,000

$819,000

$822,000

$896,000

$974,000

$1,080,000

$1,192,000

$1,271,000

$94,984,000

$3,511,000

$3,543,000

Reinsurance Premiums for Insurance Companies, Percentage of Amount Assumed to Net

16.40%

0.00%

Schedule_VI_Supplementary_Info

Schedule VI - Supplementary Information Concerning Property/Casualty Insurance Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Information For Property Casualty Insurance Underwriters [Abstract]	'	'	'
Supplemental Information for Property/Casualty Insurance, Deferred Acquisition Costs	$16,744	'	'
Supplemental Information for Property/Casualty Insurance, Reserves for Unpaid Losses and Loss Adjustment Expenses	4,219,905	3,650,127	4,272,081
Supplemental Information for Property/Casualty Insurance, Unearned Premiums	67,003	'	'
Supplemental Information for Property/Casualty Insurance, Net Premiums Earned	144,823	'	'
Supplemental Information for Property/Casualty Insurance, Net Investment Income	63,113	76,813	66,556
Supplemental Information for Property/Casualty Insurance, Net Losses and Loss Expenses Incurred for Current Year	93,442	'	'
Supplemental Information for Property/Casualty Insurance, Net Losses and Loss Expenses Incurred for Prior Year	-257,114	-237,953	-293,461
Supplemental Information for Property/Casualty Insurance, Net Paid Losses and Loss Expenses	401,496	314,528	288,175
Supplemental Information for Property/Casualty Insurance, Amortization of Deferred Acquisition Costs	23,199	'	'
Supplemental Information for Property/Casualty Insurance, Other Operating Expenses	200,928	164,143	170,000
Supplemental Information for Property/Casualty Insurance, Net Premiums Written	$39,337	'	'