EnergySolutions 10-K 31 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Jun. 30, 2013
Entity Information [Line Items]	'	'	'
Entity Registrant Name	'EnergySolutions, Inc.	'	'
Entity Central Index Key	'0001393744	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Amendment Flag	'false	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Non-accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	100	'
Entity Public Float	'	'	$0
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'		'
Cash and cash equivalents	$84,213		$134,191
Accounts receivable, net of allowance for doubtful accounts	287,438		259,913
Costs and estimated earnings in excess of billings on uncompleted contracts	85,965		98,978
Income tax receivable	2,855		6,427
Prepaid expenses	7,302		11,022
Nuclear decommissioning trust fund investments, current portion	112,475		152,507
Deferred costs, current portion	91,841		127,573
Other current assets	5,711		3,924
Total current assets	677,800		794,535
Property, plant and equipment, net	114,476		117,744
Goodwill	309,508		308,608
Other intangible assets, net	214,361		239,551
Nuclear decommissioning trust fund investments	330,442		445,989
Restricted cash and decontamination and decommissioning deposits	293,896		316,754
Deferred costs	270,039		360,185
Deferred income taxes	29,707		0
Other noncurrent assets	180,314		72,096
Total assets	2,420,543	[1]	2,655,462	[1]
Current liabilities:	'		'
Current portion of long-term debt	65,000		16,592
Accounts payable	145,857		144,649
Accrued expenses and other current liabilities	208,177		193,546
Deferred income taxes	30,363		1,101
Facility and equipment decontamination and decommissioning liabilities, current portion	98,175		138,757
Unearned revenue, current portion	118,465		150,135
Total current liabilities	666,037		644,780
Long-term debt, less current portion	666,814		798,577
Pension liability	111,644		31,043
Facility and equipment decontamination and decommissioning liabilities	378,389		485,447
Deferred income taxes	12,497		20,507
Unearned revenue, less current portion	272,940		366,710
Other noncurrent liabilities	44,007		7,479
Total liabilities	2,152,328		2,354,543
Commitments and contingencies	'		'
Stockholders’ equity:	'		'
Common stock, $0.01 par value, 100 and 1,000,000,000 shares authorized as of December 31, 2013 and December 31, 2012, respectively, and 100 and 90,253,242 shares issued and outstanding as of December 31, 2013 and December 31, 2012, respectively.	0		903
Additional paid-in capital	535,288		511,503
Accumulated other comprehensive loss	-22,877		-21,956
Accumulated deficit	-244,684		-190,031
Total EnergySolutions stockholders’ equity	267,727		300,419
Noncontrolling interests	488		500
Total equity	268,215		300,919
Total liabilities and stockholders’ equity	$2,420,543		$2,655,462
[1]	Corporate unallocated assets relate primarily to income tax receivables, deferred tax assets, deferred financing costs, prepaid expenses, and property, plant and equipment that benefit the entire Company and cash

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	100	1,000,000,000
Common stock, shares issued	100	90,253,242
Common stock, shares outstanding	100	90,253,242

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (Loss) (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

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Revenue

$474,678

$392,474

$411,038

$526,208

$480,035

$444,157

$392,621

$490,692

'

$1,804,398

[1],[2]

$1,807,505

[1],[2]

$1,815,514

[1],[2]

Cost of revenue

'

'

'

'

'

'

'

'

'

-1,606,958

-1,636,779

-1,735,826

Gross profit

67,128

36,485

47,397

46,430

56,986

46,157

35,903

31,680

'

197,440

170,726

79,688

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

-170,461

-138,211

-132,386

Impairment of goodwill

'

'

'

'

'

'

'

'

-174,000

0

0

-174,000

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

4,465

7,392

11,103

Income (loss) from operations

28,428

10,239

-22,098

14,875

18,406

18,664

4,089

-1,252

'

31,444

[2],[3]

39,907

[2],[3],[4]

-215,595

[2],[3],[4],[5]

Interest expense

'

'

'

'

'

'

'

'

'

-76,774

-71,211

-73,414

Other income (expense), net

'

'

'

'

'

'

'

'

'

-1,566

53,192

58,215

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

-46,896

21,888

-230,794

Income tax benefit (expense)

'

'

'

'

'

'

'

'

'

-7,769

-17,959

37,145

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,665

3,929

-193,649

Less: Net loss (income) attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

12

53

-2,532

Net income (loss) attributable to EnergySolutions

15,632

-4,855

-57,230

-8,200

-10,845

10,052

5,444

-669

'

-54,653

3,982

-196,181

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,665

3,929

-193,649

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

3,911

6,863

147

Change in unrecognized actuarial losses

'

'

'

'

'

'

'

'

'

-4,832

-450

-3,005

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

-55,586

10,342

-196,507

Less: net loss (income) attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

12

53

-2,532

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

($55,574)

$10,395

($199,039)

[1]

We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.

[2]

Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and

[3]

For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.

[4]

Included in income (loss) from operations from our Projects group for the years ended December 31, 2012 and 2011, is an $8.7 million non-cash favorable ARO adjustment and a $94.9 million non cash unfavorable ARO estimated cost adjustment, respectively, related to the Zion Station project, for which no corresponding revenue was recognized.

[5]

For the year ended December 31, 2011, included in income (loss) from operations from our Projects and LP&D groups, is a goodwill impairment charge of $35.0 million and $139.0 million, respectively.

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Stockholders' Equity (USD $)

Total

Common Stock

Additional Paid-in Capital

Accumulated Other Comprehensive Loss

Accumulated Deficit

Noncontrolling Interests

Energy Solutions Inc.

Energy Solutions Inc.

Energy Solutions Inc.

Parent

Parent

Parent

In Thousands, except Share data, unless otherwise specified

Common Stock

Additional Paid-in Capital

Common Stock

Additional Paid-in Capital

Balance at Dec. 31, 2010

$478,538

$887

$498,092

($25,511)

$2,168

$2,902

'

'

'

'

'

'

Balance (in shares) at Dec. 31, 2010

'

88,667,843

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-193,649

'

'

'

-196,181

2,532

'

'

'

'

'

'

Equity-based compensation

9,975

'

9,975

'

'

'

'

'

'

'

'

'

Vesting of restricted stock (in shares)

'

320,189

'

'

'

'

'

'

'

'

'

'

Vesting of restricted stock

0

3

-3

'

'

'

'

'

'

'

'

'

Minimum tax withholdings on restricted stock awards

-116

'

-116

'

'

'

'

'

'

'

'

'

Minimum tax withholdings on restricted stock awards (in shares)

'

-17,261

'

'

'

'

'

'

'

'

'

'

Acquisition of noncontrolling interests in subsidiaries

-2,486

'

-1,967

'

'

-519

'

'

'

'

'

'

Distributions to noncontrolling interests

-4,204

'

'

'

'

-4,204

'

'

'

'

'

'

Issuance of common stock

'

10,350

'

'

'

'

'

'

'

'

'

'

Issuance of common stock (in shares)

57

0

57

'

'

'

'

'

'

'

'

'

Change in unrecognized actuarial loss

-3,005

'

'

-3,005

'

'

'

'

'

'

'

'

Foreign currency translation, net of taxes

147

'

'

147

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2011

285,257

890

506,038

-28,369

-194,013

711

'

'

'

'

'

'

Balance (in shares) at Dec. 31, 2011

'

88,981,121

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

3,929

'

'

'

3,982

-53

'

'

'

'

'

'

Equity-based compensation

4,101

'

4,101

'

'

'

'

'

'

'

'

'

Vesting of restricted stock (in shares)

'

418,564

'

'

'

'

'

'

'

'

'

'

Vesting of restricted stock

0

4

-4

'

'

'

'

'

'

'

'

'

Minimum tax withholdings on restricted stock awards

-120

'

-120

'

'

'

'

'

'

'

'

'

Minimum tax withholdings on restricted stock awards (in shares)

'

-31,057

'

'

'

'

'

'

'

'

'

'

Distributions to noncontrolling interests

-158

'

'

'

'

-158

'

'

'

'

'

'

Issuance of common stock

'

884,614

'

'

'

'

'

'

'

'

'

'

Issuance of common stock (in shares)

1,497

9

1,488

'

'

'

'

'

'

'

'

'

Change in unrecognized actuarial loss

-450

'

'

-450

'

'

'

'

'

'

'

'

Foreign currency translation, net of taxes

6,863

'

'

6,863

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2012

300,919

903

511,503

-21,956

-190,031

500

'

'

'

'

'

'

Balance (in shares) at Dec. 31, 2012

90,253,242

90,253,242

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-54,665

'

'

'

-54,653

-12

'

'

'

'

'

'

Equity-based compensation

5,397

'

5,397

'

'

'

'

'

'

'

'

'

Vesting of restricted stock (in shares)

'

2,206,430

'

'

'

'

'

'

'

'

'

'

Vesting of restricted stock

0

22

-22

'

'

'

'

'

'

'

'

'

Minimum tax withholdings on restricted stock awards

-432

-1

-431

'

'

'

'

'

'

'

'

'

Minimum tax withholdings on restricted stock awards (in shares)

'

-111,107

'

'

'

'

'

'

'

'

'

'

Capital contribution

25,259

'

25,259

'

'

'

'

'

'

'

'

'

Common stock repurchased and retired

'

'

'

'

'

'

-7,342

-18

-7,324

-376,514

-906

-375,608

Common stock repurchased and retired (in shares)

'

'

'

'

'

'

'

-1,779,520

'

'

-90,569,045

'

Issuance of common stock

'

100

'

'

'

'

'

'

'

'

'

'

Issuance of common stock (in shares)

376,514

'

376,514

'

'

'

'

'

'

'

'

'

Change in unrecognized actuarial loss

-4,832

'

'

-4,832

'

'

'

'

'

'

'

'

Foreign currency translation, net of taxes

3,911

'

'

3,911

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2013

$268,215

$0

$535,288

($22,877)

($244,684)

$488

'

'

'

'

'

'

Balance (in shares) at Dec. 31, 2013

100

100

'

'

'

'

'

'

'

'

'

'

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
Cash flows from operating activities	'		'		'
Net income (loss)	($54,665)		$3,929		($193,649)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:	'		'		'
Depreciation, amortization and accretion expense	68,871	[1]	79,611	[1]	80,694
Equity-based compensation expense	5,397		4,101		9,975
Deferred income taxes	-9,491		-1,827		-50,812
Amortization of debt financing fees and debt discount	8,957		4,862		5,327
Impairment of goodwill	0		0		174,000
Asset retirement obligation estimated cost adjustment	0		-8,708		94,860
Loss (gain) on disposal of property, plant and equipment	778		5,428		-100
Realized and unrealized gains on nuclear decommissioning trust fund investments	-10,615		-62,817		-58,513
Changes in operating assets and liabilities:	'		'		'
Accounts receivable	-22,487		51,982		-8,891
Costs and estimated earnings in excess of billings on uncompleted contracts	13,689		15,141		-7,813
Prepaid expenses and other current assets	4,935		-5,402		-8,961
Accounts payable	6,621		-1,320		40,320
Accrued expenses and other current liabilities	13,684		-41,049		33,235
Unearned revenue	-125,447		-111,781		-143,836
Facility and equipment decontamination and decommissioning liabilities	-173,191		-162,334		-191,476
Restricted cash and decontamination and decommissioning deposits	1,835		16,164		4,258
Nuclear decommissioning trust fund	161,558		158,352		161,504
Deferred costs	127,325		126,785		135,959
Other noncurrent assets	-99,177		96,853		-19,948
Other noncurrent liabilities	107,563		-100,334		19,407
Net cash provided by operating activities	26,140		67,636		75,540
Cash flows from investing activities	'		'		'
Purchase of nuclear decommissioning trust fund investments	-884,481		-877,723		-1,072,139
Proceeds from sales of nuclear decommissioning trust fund investments	888,916		881,672		1,076,635
Purchases of property, plant and equipment	-15,199		-20,345		-23,734
Purchases of intangible assets	0		-763		-610
Acquisition of noncontrolling interest on subsidiary	0		0		-2,486
Proceeds from disposition of property, plant and equipment	49		5,336		236
Net cash used in investing activities	-10,715		-11,823		-22,098
Cash flows from financing activities	'		'		'
Repayments of long-term debt	-87,000		0		-30,200
Restricted cash held as collateral of letter of credit obligations	21,000		0		0
Proceeds from revolver credit facility	5,000		0		0
Payments on revolver credit facility	-5,000		0		0
Distributions to noncontrolling interests partners	0		-158		-4,204
Capital contribution	14,407		0		0
Proceeds from exercise of stock options	0		0		57
Minimum tax withholding on restricted stock awards	-432		-120		-116
Proceeds from issuance of common stock	0		1,497		0
Repurchase of common stock	-7,342		0		0
Repayments of capital lease obligations	-844		-654		-695
Debt financing fees	-4,535		0		0
Net cash (used in) provided by financing activities	-64,746		565		-35,158
Effect of exchange rate on cash	-657		600		-1,263
Net increase (decrease) in cash and cash equivalents	-49,978		56,978		17,021
Cash and cash equivalents, beginning of period	134,191		77,213		60,192
Cash and cash equivalents, end of period	$84,213		$134,191		$77,213
[1]	Depreciation, amortization and accretion expenses ("DA&A") are included in cost of revenue and SG&A expenses in the accompanying consolidated statements of operations and comprehensive income (loss). DA&A expenses included in cost of revenue for the years ended December 31, 2013, 2012 and 2011, were $47.9 million, $56.3 million and $58.3 million, respectively. DA&A expenses included in SG&A for years ended December 31, 2013, 2012 and 2011, were $20.9 million, $23.3 million and $22.4 million, respectively.

Description_of_Business

Description of Business	12 Months Ended
	Dec. 31, 2013
Description of Business	'
Description of Business	'
	Description of Business
	EnergySolutions, Inc. ("we," "our," "EnergySolutions" or the "Company") provides a broad range of services nationally and internationally. Our broad range of nuclear services includes engineering, in-plant support services, spent nuclear fuel management, decontamination and decommissioning ("D&D") services, operation of nuclear reactors, comprehensive long-term stewardship D&D work for shut-down nuclear power plants, logistics, transportation, processing and LLRW disposal. We derive almost 100% of our revenue from the provision of nuclear services. We operate facilities for the processing and disposal of radioactive materials, including one facility in Clive, Utah, four facilities in Tennessee, two facilities in Barnwell, South Carolina and one facility in Brampton, Ontario, Canada. We also provide turn-key services and sub-contract services for the treatment, processing, storage and disposal of radioactive waste from nuclear sites and non-nuclear facilities.
	On January 7, 2013, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with Rockwell Holdco, Inc., a Delaware corporation (the "Parent" or "Rockwell") and Rockwell Acquisition Corp., a Delaware corporation and wholly owned subsidiary of Parent ("Merger Sub") established as an acquisition vehicle for the purpose of acquiring the Company. The Merger Agreement was later amended on April 5, 2013. Pursuant to the terms of the Merger Agreement, as amended, on May 24, 2013, (the "Merger Date"), Merger Sub merged with and into the Company, with the Company surviving as a wholly-owned subsidiary of Parent (the "Merger"). Parent is 100% owned by Energy Capital Partners II, LP and its parallel funds ("Energy Capital" or "ECP") a private equity firm focused on investing in North America’s energy infrastructure.
	We have contracts with government and commercial customers. Our government customers are primarily individual offices, departments and administrations within the U.S. Department of Energy ("DOE"), U.S. Department of Defense ("DOD"), the Nuclear Decommissioning Authority ("NDA") in the United Kingdom ("U.K.") and state agencies. Our commercial customers include power and utility companies, pharmaceutical companies, research laboratories, manufacturing and industrial facilities, hospitals, universities and other commercial entities that are involved with nuclear materials.
	We report our results through four major operating groups: Projects, Products, Logistics, Processing and Disposal ("LP&D") and International.
	Exelon Transaction
	On December 11, 2007, we, through our subsidiary ZionSolutions, LLC ("ZionSolutions"), entered into certain agreements with Exelon Generation Company LLC ("Exelon"), (the "Exelon Agreements") to dismantle Exelon's Zion nuclear facility located in Zion, Illinois ("Zion Station"), which ceased operation in 1998. The transaction closed on September 1, 2010. Upon closing, Exelon transferred to ZionSolutions substantially all of the assets (other than land) associated with Zion Station, including assets held in nuclear decommissioning trusts. In consideration for Exelon's transfer of those assets, ZionSolutions agreed to assume decommissioning and other liabilities associated with Zion Station. ZionSolutions also took possession and control of the land associated with Zion Station pursuant to a lease agreement executed at the closing. ZionSolutions is under contract to complete the required decommissioning work according to an established schedule and to construct a dry cask storage facility on the land for spent nuclear fuel currently held in spent fuel pools at Zion Station. Exelon retains ownership of the land and the spent nuclear fuel and associated operational responsibilities following completion of the Zion Station D&D project. The Nuclear Regulatory Commission ("NRC") approved the transfer of the facility operating licenses and conforming license amendments from Exelon to ZionSolutions ("License Transfer").
	To satisfy the conditions of the NRC order approving the License Transfer, we (i) secured a $200.0 million letter of credit facility, (ii) granted an irrevocable easement of disposal capacity of 7.5 million cubic feet at our Clive disposal facility, and (iii) purchased the insurance required of a licensee under the NRC's regulations.
	We provided a guarantee as primary obligor to the full and prompt payment and performance by ZionSolutions of all its obligations under the various agreements with Exelon. This guarantee would deplete Company assets before the $200.0 million letter of credit (described below) would fund remaining D&D activities. We also pledged 100% of our interests in ZionSolutions to Exelon. In addition, we were required to obtain a $200.0 million letter of credit facility to further support the D&D activities at the Zion Station, which is held in a backup trust. If the Company exhausts its resources and ability to complete the D&D activities and in the event of a material default (as defined within the Credit Support Agreement), Exelon may exercise its rights to take possession of ZionSolutions. At that point, through their ownership of ZionSolutions, Exelon (not the Company) would then be entitled to control the funds associated with the letter of credit through control of the backup trust. Under the terms of the Company's financing arrangements, the Company obtained restricted cash and took on a liability for the letter of credit facility.
	Accounting for the Exelon Transaction
	As discussed above, in December 2007, we entered into certain agreements with Exelon to dismantle the Zion Station. After closing, we recognized the costs and the related revenue associated with the planning contract in our consolidated statements of operations and comprehensive income (loss), with $5.1 million in revenue representing the related gross profit being deferred over the period of D&D work.
	On the date of the closing of the asset sale agreement, the trust fund investments of approximately $801.4 million previously held by Exelon for the purpose of decommissioning the Zion Station nuclear power plant were transferred to us and the use of those funds, and any investment returns arising therein, remains restricted solely to that purpose. The investments are classified as trading securities and as such, the investment gains and losses are recorded in the statements of operations and comprehensive income (loss) as other income (expense), net. As part of this transaction, we have assumed Exelon's cost basis in the investments, for tax purposes, which included an unrealized gain of approximately $171.7 million at the closing date which resulted in a deferred tax liability of approximately $34.3 million. To the extent that the trust fund assets exceed the costs to perform the D&D work, we have a contractual obligation to return any excess funds to Exelon. Throughout the period over which we perform the D&D work, we will assess whether such a contingent liability exists using the measurement thresholds under ASC 450-20.
	As the trust fund assets that were transferred to us represent a prepayment of fees to perform the D&D work, we also recorded deferred revenue, including deferred revenue associated with the planning contract, of $772.2 million. Revenue recognition throughout the life of the project is based on the proportional performance method using a cost-to-cost approach.
	In conjunction with the acquisition of the shut down nuclear power plant, we became responsible for and assumed the asset retirement obligations ("AROs") for the plant and we established and initially measured an ARO in accordance with ASC 410-20. Subsequent measurement of the ARO follows ASC 410-20 accounting guidance, including the recognition of accretion expense, reassessment of the remaining liability using our estimated costs to complete the D&D work plus a profit margin and recognition of the ARO gain as the obligation is settled. The ARO gain results from the requirement to record costs plus an estimate of third-party profit in determining the ARO. When we perform the work using internal resources and reduce the ARO for work performed we recognize a gain if actual costs are less than the estimated costs plus the third-party profit. Accretion expense and the ARO gain are recorded within cost of revenue because, through this arrangement, we are providing D&D services to a customer. Any change to the ARO as a result of cost estimate changes are also recorded to cost of revenue in the statements of operations and comprehensive income (loss) in the period identified. We also recorded deferred costs to reflect the costs incurred to acquire the future revenue stream. The deferred cost balance was initially recorded at $767.1 million, which is the same value as the initial ARO, and is amortized into cost of revenue in the same manner as deferred revenue, using the proportional performance method.
	Subsequent Events
	On March 31, 2014, the NDA announced the selection of a preferred bidder for the contract to manage the Magnox sites. We have managed the Magnox sites for the NDA since June 2007. We expect to continue to manage the Magnox sites and work on transition activities through the end of August 2014 at which time, subject to procedures related to bid protests, if any, the new contractor will commence management of the Magnox sites. Income from operations for our International segment which is mainly attributable to our management of the Magnox sites for the years ended December 31, 2013, 2012 and 2011 has been approximately $30.8 million, $30.3 million and $26.0 million, respectively. However, we bid the Magnox Contracts as a minority 40% partner in a joint venture and expected only our proportionate share of the joint venture income in future forecasts. We have approximately$85.0 million in intangible assets associated with our International segment that we will need to evaluate for possible impairment. We may also incur severance costs as we work to relocate or redeploy affected employees, but we are unable to estimate those amounts at this time.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	(a) Basis of Presentation and Principles of Consolidation
	The accompanying consolidated financial statements contain the accounts of EnergySolutions, Inc., a Delaware corporation, and its wholly owned subsidiaries and controlled joint ventures after eliminating all intercompany balances and transactions in consolidation. We evaluated all subsequent events through the date that we filed these financial statements in our Annual Report on Form 10-K with the Securities and Exchange Commission (the "SEC").
	We have majority voting rights for one of our minority-owned joint ventures. Accordingly, we have consolidated its operations in our consolidated financial statements and therefore, we recorded the noncontrolling interests, which reflect the portion of the earnings of operations which are applicable to other noncontrolling partners. Assets from our consolidated joint venture can only be used to settle its own obligations. Additionally, our assets cannot be used to settle the joint ventures’ obligations because this minority owned joint venture does not have recourse to our general credit.
	(b) Use of Estimates
	The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and disclosures of contingencies at the date of the financial statements and revenue and expenses recognized during the reporting period. Significant estimates and judgments made by management include: (i) proportion of completion on long-term contracts, (ii) the costs to close and monitor our landfill and D&D facilities and equipment including D&D of Zion Station, (iii) recovery of long-lived assets, (iv) analysis of goodwill impairment, (v) useful lives of intangibles assets and property, plant and equipment, (vi) costs for unpaid claims and associated expenses related to employee health insurance, (vii) the determination of rate reserve provisions, (viii) provision for a valuation allowance on deferred tax assets, (ix) uncertainties in income taxes, (x) contingencies and litigation and (xi) stock price volatility and expected forfeiture rates for stock option valuations. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ significantly from those estimates.
	(c) Cash and Cash Equivalents
	We consider all cash on deposit, money market accounts and highly-liquid debt instruments purchased with original maturities of three months or less to be cash and cash equivalents. We maintain cash and cash equivalents in bank deposit and other investment accounts which, at times, may exceed federally insured limits.
	(d) Accounts Receivable
	Accounts receivable are recorded at the invoiced amount and generally do not bear interest. The carrying amount of accounts receivable, net of the allowance for doubtful accounts, represents estimated net realizable value. The allowance for doubtful accounts is a valuation allowance that reflects management's best estimate of the amounts that will not be collected. The allowance for doubtful accounts is estimated based on historical collection trends, type of customer, the age of outstanding receivables and existing economic conditions. We generally do not require collateral for accounts receivable; however, we regularly review all accounts receivable balances and assess the collectability of those balances. If events or changes in circumstances indicate that specific receivable balances may be impaired, further consideration is given to the collectability of those balances and the allowance is adjusted accordingly. Account balances are written off against the allowance after all reasonable means of collection have been exhausted and recovery is considered remote. We had an allowance for doubtful accounts of $4.8 million and $1.8 million as of December 31, 2013 and 2012, respectively.
	(e) Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts, Unearned Revenue and Retainage.
	Costs and estimated earnings in excess of billings on uncompleted contracts represent amounts recognized as revenue that have not been billed. Unearned revenue represents amounts billed and collected for which revenue has not been recognized. Contracts typically provide for the billing of costs incurred and estimated earnings on a monthly basis or based on contract milestones. We recognize a rate differential for any anticipated liabilities or receivables resulting from the difference between estimated billing rates and actual rates on certain contracts with the federal government. This differential liability or receivable will be settled based upon the completion of audits of the actual rates by the applicable federal government audit agency and negotiation of final indirect rates with the applicable federal agency official. As of December 31, 2013 and 2012, we had outstanding rate reserve receivables totaling $8.1 million and $6.9 million, respectively, which are included in noncurrent assets, outstanding rate reserve liabilities totaling $2.5 million and $1.9 million, respectively, of which $0.8 million and $1.4 million, respectively, are current and are included in accrued expenses and other current liabilities within our consolidated balance sheets. The remaining portion is classified as long term and is included in other noncurrent liabilities in our consolidated balance sheets.
	Retainage represents amounts that are billed or billable to our customers, but are retained by the customer until completion of the project or as otherwise specified in the contract. As of December 31, 2013 and 2012, we had retainage balances of $6.5 million and $4.4 million, respectively, of which $2.7 million and $1.3 million, respectively, were current and included in other current assets in the consolidated balance sheets. The remaining portion is classified as long term and is included in other noncurrent assets in our consolidated balance sheets.
	(f) Nuclear Decommissioning Trust Fund Investments
	The nuclear decommissioning trust ("NDT") fund was established solely to satisfy obligations related to the D&D of the Zion Station. The NDT fund holds investments in debt and equity securities directly and indirectly through commingled funds. Investments in the NDT fund are carried at fair value and are classified as trading securities. Gains and losses resulting from adjustments to fair value are recorded in the statements of operations and comprehensive income (loss) as other income (expense), net.
	We consolidate the NDT fund as a variable interest entity. We have a contractual interest in the NDT fund and such interest is a variable interest due to its exposure to the fluctuations caused by market risk. We are the primary beneficiary of the NDT as we benefit from positive market returns and bear the risk of market losses. We are able to control the NDT fund by appointing the trustee, and subject to certain restrictions, we are able to direct the investment policies of the fund.
	(g) Variable Interest Entities
	We participate in joint ventures and partnerships to bid, negotiate and complete specific projects. We are required to consolidate these joint ventures if we hold the majority voting interest or if we meet the criteria under the variable interest model as described below.
	A variable interest entity ("VIE") is an entity with one or more of the following characteristics (a) the total equity investment at risk is not sufficient to permit the entity to finance its activities without additional financial support; (b) as a group, the holders of the equity investment at risk lack the ability to make certain decisions, the obligation to absorb expected losses or the right to receive expected residual returns; or (c) an equity investor has voting rights that are disproportionate to its economic interest and substantially all of the entity's activities are on behalf of the investor.
	Our VIEs may be funded through contributions, loans and/or advances from the joint venture partners or by advances and/or letters of credit provided by our clients. Our VIEs may be directly governed, managed, operated and administered by the joint venture partners. Others have no employees and, although these entities own and hold the contracts with the clients, the services required by the contracts are typically performed by the joint venture partners or by other subcontractors.
	If we are determined to be the primary beneficiary of the VIE, we are required to consolidate it. We are considered to be the primary beneficiary if we have the power to direct the activities that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. In determining whether we are the primary beneficiary, our significant assumptions and judgments include the following:
	•	Identifying the significant activities and the parties that have the power to direct them;
	•	Reviewing the governing board composition and participation ratio;
	•	Determining the equity, profit and loss ratio;
	•	Determining the management-sharing ratio; and
	•	Reviewing the funding and operating agreements.
	Investments in entities in which we do not have a controlling financial interest, but over which we have a significant influence are accounted for using the equity method.
	We continuously evaluate our VIEs as facts and circumstances change to determine whether we are the primary beneficiary in accordance with authoritative guidance. This evaluation may result in consolidation of a previously unconsolidated joint venture or in deconsolidation of a previously consolidated joint venture.
	(h) Property, Plant and Equipment
	Property, plant and equipment are stated at cost. Property, plant and equipment acquired through the acquisition of a business are recorded at their estimated fair value at the date of acquisition. Depreciation on property, plant and equipment is calculated on the straight-line method over the estimated useful lives of the assets. Maintenance and repairs that do not extend the lives of the assets are expensed as incurred. Estimated useful lives of the assets are as follows:
			Years
	Buildings, building improvements and land improvements		5 to 31
	Computer hardware and software		1 to 7
	Furniture and fixtures		5 to 7
	Machinery and equipment		5 to 20
	Trucks and vehicles		5 to 15
	Equipment under capital leases is stated at the present value of minimum lease payments and is amortized on the straight-line method over the shorter of the lease term or estimated useful life of the asset.
	We capitalize costs associated with the construction of disposal cells such as excavation, liner construction and drainage systems construction, as well as the asset retirement obligations ("ARO") in accordance with accounting guidance for AROs. These costs are depreciated over the capacity of the individual cells based on a per unit basis as landfill airspace is consumed.
	(i) Impairment of Long-Lived Assets
	Impairment charges are recognized for the excess of carrying amount over the fair value of the asset. Long-lived assets such as property, plant and equipment and purchased intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Examples of such events are i) significant adverse changes in its market value, useful life or physical condition; ii) changes in estimated undiscounted future cash flows or forecast that demonstrates continuing losses associated with the use of the intangible asset; or iii) a current expectation that, more likely than not, the intangible asset will be sold or otherwise disposed of before the end of its previously estimated useful life.
	(j) Goodwill and Other Intangible Assets
	Goodwill represents the excess of cost over the fair value of net assets of businesses acquired. Goodwill acquired in a purchase business combination and determined to have an indefinite useful life is not amortized, but instead is tested for impairment annually or when indicators of impairment exist. Intangible assets are amortized based on the period over which the contractual or economic benefits of the intangible assets are expected to be realized.
	We evaluate goodwill at the reporting unit level at least annually for impairment and more frequently if an event occurs or circumstances change that indicate that the asset might be impaired. Under applicable accounting guidance, we are permitted to use a qualitative approach to evaluating goodwill impairment when no indicators of impairment exist and if certain accounting criteria are met. To the extent that indicators exist or the criteria are not met, we use a quantitative approach to evaluate goodwill impairment. Such quantitative impairment assessment is performed using a two-step, fair value based test. The first step compares the fair value of the reporting unit to its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the second step is performed. The second step requires an allocation of fair value to the individual assets and liabilities using purchase price allocation guidance in order to determine the implied fair value of goodwill. If the implied fair value of goodwill is less than the carrying amount, an impairment loss is recorded as a reduction to goodwill and a charge to operating expense.
	Application of the goodwill impairment test requires management judgment, including the identification of reporting units, assigning assets, liabilities and goodwill to the reporting units and determining the fair value of the reporting unit. We estimate the fair value of the reporting units using a combination of an income and a market approach. Forecasts of future cash flow are based on our best estimate of future net sales and operating expenses, based primarily on estimated category expansion, pricing, market segment penetration and general economic conditions. The market approach is calculated based on market multiples for comparable companies as applied to our company-specific metrics. We believe the blended use of both models compensates for the inherent risk associated with either model if used on a stand-alone basis, and this combination is indicative of the factors a market participant would consider when performing a similar valuation. In addition, cash flow forecasts used to assess both goodwill and certain other intangible assets, in particular customer relationships, include assumptions regarding contract wins or extensions.
	(k) Facility and Equipment Decontamination and Decommissioning Liabilities
	We have responsibility for the cost to D&D our facilities and related equipment, as well as the equipment used at customer sites in our Projects group. These costs are generally paid upon closure of the facilities or disposal of the equipment. We are also responsible for the cost of monitoring our Clive, Utah facility over its post-closure period. We have also acquired the shut down nuclear power plant at the Exelon Zion Station and assumed the related D&D liabilities.
	Accounting guidance for AROs requires us to record the fair value of an ARO as a liability in the period in which we incur a legal obligation associated with the retirement of tangible long-lived assets that result from the acquisition, construction, development or normal use of the asset, except for the Zion Station related ARO. We are also required to record a corresponding asset that we depreciate over the life of the asset. For the Zion Station related ARO we do not record an ARO asset that depreciates because the underlying tangible assets have no future value. Instead, we have capitalized deferred project costs that will be amortized to cost of revenue as the D&D work is performed. After the initial measurement of our AROs, the ARO is adjusted at the end of each period to reflect the passage of time (accretion) and changes in the estimated future cash flows underlying the obligation.
	The cost basis for our landfill assets and related obligation include landfill liner material and installation, excavation for airspace, landfill leachate collection systems, environmental groundwater and air monitoring equipment, directly related engineering and design costs and other capital infrastructure costs. Also included in the cost basis of our landfill assets and related obligation are estimates of future costs associated with final landfill capping, closure and post-closure monitoring activities. These costs are described below:
	•	Final capping—Involves the installation of final cap materials over areas of the landfill where total airspace has been consumed. We estimate available airspace capacity using aerial and ground surveys and other methods of calculation, based on permit-mandated height restrictions and other factors. Final capping AROs are recorded, with a corresponding increase in the landfill asset, as landfill airspace capacity is permitted for waste disposal activities and the cell liner is constructed. Final capping costs are recorded as an asset and a liability based on estimates of the discounted cash flows and capacity associated with the final capping event.
	•	Closure—Involves the remediation of our land surrounding the disposal cell and the disposal of Company-owned property and equipment. These are costs incurred after the site ceases to accept waste, but before the site is certified to be closed by the applicable regulatory agency. These costs are accrued as an ARO, with a corresponding increase in the landfill asset, as airspace is consumed over the life of the landfill. Closure obligations are accrued over the life of the landfill based on estimates of the discounted cash flows associated with performing closure activities.
	•	Post-closure—Involves the maintenance and monitoring of our landfill site that has been certified to be closed by the applicable regulatory agency. Subsequent to landfill closure, we are required to maintain and monitor our landfill site for a 100-year period. These maintenance and monitoring costs are accrued as an ARO, with a corresponding increase in the landfill asset, as airspace is consumed over the life of the landfill. Post-closure obligations are accrued over the life of the landfill based on estimates of the discounted cash flows associated with performing post-closure activities.
	The cost basis of our AROs (and, if applicable, our ARO assets) includes costs to decontaminate, disassemble and dispose of equipment and facilities. We develop our estimates of these obligations using input from our operations personnel, engineers and internal accountants. Our estimates are based on our interpretation of current requirements and proposed regulatory changes and are intended to reflect what a market participant would charge to undertake the obligation. We use historical experience, professional engineering judgment and quoted and actual prices paid for similar work to determine the fair value of these obligations. We recognize these obligations using market prices whether we plan to contract with third parties or perform the work ourselves.
	Costs for the D&D of our facilities and equipment will generally be paid upon the closure of these facilities or the disposal of this equipment. We are obligated under our license granted by the state of South Carolina and the Atlantic Interstate Low-Level Radioactive Waste Compact Implementation Act for costs associated with the ultimate closure of the Barnwell Low-Level Radioactive Waste Disposal Facility in South Carolina and our buildings and equipment located at the Barnwell site (Barnwell closure). Under the terms of the Atlantic Waste Compact Act and our license with the state of South Carolina, we are required to maintain a trust fund to cover the Barnwell closure obligation, which limits our obligation to the amount of the trust fund. We are also obligated under our NRC license and contractual agreements related to Zion Station for costs associated with the D&D of the plant. As part of our Exelon Agreements, we also acquired a trust fund which will be used to pay for these costs. To the extent that the trust fund is not sufficient to pay for all costs of the D&D activities, we will fund the remaining costs from our other operations.
	We are required to make significant estimates in the determination of our AROs and the related assets, if applicable. Because final landfill capping, closure and post-closure obligations and D&D obligations are measured using present value techniques, changes in the estimated timing of the related activities would have an effect on these liabilities, related assets and resulting operations.
	Changes in inflation rates or the estimated costs, timing or extent of the required future capping, closure, post-closure and other D&D activities typically result in both: (i) a current adjustment to the recorded liability and asset and (ii) a change in the liability and asset amounts to be recorded prospectively over the remaining life of the asset in accordance with our depreciation policy. However, for the Zion Station related ARO, these changes are not capitalized or depreciated as an ARO asset but are instead recorded directly to cost of revenue in the consolidated statements of operations and comprehensive income (loss).
	We update our final capping, closure and post-closure cost estimates either annually or more frequently if changes in the underlying conditions occur. These estimates are based on current technology, regulations and burial rates. Changes in these factors could have a material impact on our estimates. If we perform work internally related to AROs, we will recognize a gain for the difference between our actual costs incurred and the recorded ARO, which includes an element of profit. While other ARO gains are classified as a reduction in SG&A expenses, we classify the recognition of the third-party profit included in the Zion Station ARO in cost of revenue as activities are performed because we are undertaking these activities pursuant to our core business strategy and fulfilling the cost of the contract represents ongoing major or central operations of EnergySolutions.
	(l) Self-Insurance and Recoveries
	We have retained a portion of the financial risk related to our employee health insurance plan. The exposure for unpaid claims and associated expenses, including incurred but not reported losses, generally is estimated by considering pending claims and historical trends and data.
	(m) Other long term liabilities
	We recognize a liability for contract termination costs associated with an exit activity for costs that will continue to be incurred under a lease for its remaining term without economic benefit to us, initially measured at its fair value at the cease-use date. The fair value is determined based on the remaining lease rentals, adjusted for the effects of any prepaid or deferred items recognized under the lease, and reduced by estimated sublease rentals.
	(n) Share-Based Payment
	We recognized shared based compensation costs in the consolidated statement of operations and comprehensive income (loss) over the instruments' vesting periods based on the instruments' fair values on the measurement date, which is generally the date of the grant. In our share-based compensation strategy we have utilized a combination of stock options and restricted stock that vest over time based on service and performance. For time-based stock options and restricted stock, compensation expense is recognized over the vesting period from the vesting commencement date using the straight-line method. For performance based stock options and restricted stock compensation, expense is recognized over the vesting period beginning at the grant date if it is probable that performance targets will be achieved. If prior to the performance measurement date, it is no longer probable that the performance targets will be achieved, the expense related to the grant will be adjusted accordingly and prior recognized compensation expense will be reversed. Also, if at the performance measurement date the performance targets are not achieved, the expense related to the grants will be adjusted to the earned amounts and compensation expense will also be adjusted accordingly.
	We use the Black-Scholes valuation model to estimate the fair value of stock options. Option valuation methods, including Black-Scholes, require the input of assumptions including the risk-free interest rate, expected term and volatility rate. For awards with a market condition, we use a Monte Carlo valuation model. See Note 13 for further discussion regarding the assumptions used in our valuation models.
(o) Revenue and Cost of Revenue
Revenue Recognition
We record revenue when all of the following conditions exist: (i) evidence of an agreement with our customer; (ii) work has actually been performed; (iii) the amount of revenue is fixed or determinable and (iv) collection from our customer is reasonably assured. If we have multiple contracts with a single customer, we evaluate the circumstances surrounding each contract to determine whether or not the contracts are required to be grouped or segmented for revenue recognition purposes.
We recognize revenues from engineering and technical support services contracts using the percentage-of-completion method as project progress occurs. Certain contracts for services that are non-linear in nature, require complex, non-repetitive tasks or involve a non-time-based scope of work. In these contracts, the earnings process is not fulfilled upon the achievement of milestones, but rather over the life of the contract. Evaluation of the obligations and customer requirements on these contracts does not produce objective, quantifiable output measures that reflect the earnings process for revenue recognition. Therefore, in these situations, we use a cost-to-cost approach to determine revenue. A cost-to-cost approach accurately reflects our obligations and performance on these contracts. For the years ended December 31, 2013, 2012, and 2011, revenue calculated using a cost-to-cost approach, including Zion Station project revenues, were $149.3 million, $163.5 million and $175.0 million, respectively.
Our contracts may include the following multiple deliverables: transportation services, disposal services, training, on-site support, and warranties. For contracts containing multiple deliverables, we evaluate whether each deliverable should be accounted for separately or if they should be combined together for revenue recognition purposes. If the determination is made that separate accounting is required, we follow the applicable revenue recognition guidance in allocating contract value between the identified deliverables.
Revisions to revenue, cost and profit estimates, or measurements of the extent of progress toward completion, are changes in accounting estimates accounted for in the period of change (cumulative catch-up method). Contracts typically provide for periodic billings on a monthly basis or based on contract milestones. Amounts recognized as revenue that have not been billed are included in costs and estimated earnings in excess of billings on uncompleted contracts. Amounts billed and collected for which revenue has not been recognized are included in unearned revenue.
Accounting for revenue earned under our contracts may require assessments that include an estimate of the amount that has been earned on the contract and are usually based on the volumes that have been processed or disposed, milestones reached or the time that has elapsed under the contract. Each of our contracts is unique with regard to scope, schedule and delivery methodology. Accordingly, each contract is reviewed to determine the most reliable measure of completion for revenue recognition purposes.
Contract Types
Cost-reimbursable award or incentive-fee contracts—We are reimbursed for allowable costs in accordance with Federal Acquisition Regulation ("FAR"), Cost Accounting Standards ("CAS") or contractual provisions. If our costs exceed the contract ceiling or are not allowable under the provisions of the contract FAR or CAS, we may not be able to obtain reimbursement for such costs. We earn award and incentive fees in addition to cost reimbursements if we meet certain contract provisions, including schedule, budget, and safety milestones. Monthly assessments are made to measure the amount of revenue earned in accordance with established contract provisions. We receive award and incentive fees on certain contracts, which are accrued when estimable and collection is reasonably assured.
Fixed-price contracts—Under these contracts, we receive a fixed amount of revenue irrespective of the actual costs we incur. Revenue is recognized using the proportional performance method of accounting using appropriate output measures, where estimable, or on other input measures such as proportion of costs incurred to total estimated contract costs.
Unit-rate contracts— We recognized revenue using the proportional performance method of accounting as units are completed based on contractual unit rates. Revenue from our LP&D segment is derived primarily through unit-rate contracts for the shipping, processing and disposal of radioactive materials. A unit-rate contract is essentially a fixed-price contract with the only variable being units of work performed. These contracts generally provide that we will process and dispose of substantially all of the low-level radioactive waste generated by our customers for a fixed, pre-negotiated price per cubic foot, depending on the type of radioactive material being disposed.
Time and materials contracts— Under these contracts, we negotiate hourly billing rates and charge our clients based on the actual time that we spend on a project. In addition, clients reimburse us for our actual out-of-pocket costs of materials and other direct incidental expenditures that we incur in connection with our performance under the contract. The majority of our time-and-material contracts are subject to maximum contract values and, accordingly, revenues under these contracts are generally recognized under the percentage-of-completion method. However, time-and-materials contracts that are service-related contracts are accounted for utilizing the proportional performance method. Our time-and-materials contracts also generally include annual billing rate adjustment provisions.
Change Orders
We record contract claims and pending change orders, including requests for equitable adjustments (“REAs”) when collection of revenue is reasonably assured, which generally is when accepted in writing by the customer. The costs to perform the work related to these claims and pending change orders including REAs are included in our financial statements in the period that they are incurred and are included in our estimates of contract profitability.
Provision for Loss
Provision for estimated contract losses are recorded when they are identifiable and include all estimated direct costs to complete the contract (excludes future selling, general and administrative costs expected to be allocated to the contract). Contract claims and change orders are included in total estimated contract revenue when it is probable that the change order will result in a bona fide addition to contract value and can be reliably estimated. Costs incurred for bidding and obtaining contracts are expensed as incurred. For the years ended December 31, 2013, 2012, and 2011, we recorded a $2.2 million decrease in provision for losses and a $0.9 million, and $0.2 million, increase in provision for losses, respectively.
(p) Advertising Costs
We expense advertising costs as incurred. Advertising costs are included in selling, general and administrative expenses. We incurred $3.4 million, $4.2 million and $4.1 million in advertising expenses for the years ended December 31, 2013, 2012, and 2011, respectively.
(q) Income Taxes
The Company recognizes income taxes under the asset and liability method. This approach requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant judgment is required in determining income tax provisions and in evaluating tax positions.
We account for income taxes in accordance with authoritative accounting guidance. Judgment is required in determining our provision for income taxes. In the normal course of business, we may engage in numerous transactions every day for which the ultimate tax outcome (including the period in which the transaction will ultimately be included in taxable income or deducted as an expense) is uncertain. Additionally, the tax returns we file are subject to audit and investigation by the Internal Revenue Service ("IRS"), state agencies in the U.S. and by foreign government agencies. Deferred tax assets are reduced by the amount of any tax benefits that are not expected to be realized.
We account for unrecognized tax benefits in accordance with authoritative guidance for uncertainty in income taxes which requires us to recognize in our financial statements the impact of a tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. We recognize interest and penalties related to unrecognized tax benefits as a component of the provision for income taxes. We recognized interest related to tax refunds as a component of other income.
Our income tax expense and our effective tax rate are determined from earnings before income taxes less net income attributable to the noncontrolling interest related to consolidations.
(r) New Accounting Pronouncements
In January 2014, the Financial Accounting Standards Board ("FASB") issued an update on accounting for service concession arrangements. The update clarifies that, unless certain circumstances are met, operating entities should not account for certain concession arrangements with public-sector entities as leases and should not recognize the related infrastructure as property, plant and equipment. The update is effective for interim and annual reporting periods beginning after December 15, 2014. Management does not expect the adoption of this update to have a material impact on the Company's financial position, results of operations or cash flows.
In July 2013, the FASB issued guidance related to presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance eliminates diversity in practice for presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is available to reduce the taxable income or tax payable that would result from disallowance of a tax position. This guidance is effective for interim and annual reporting periods beginning after December 15, 2013 and should be applied prospectively to all unrecognized tax benefits that exist at the effective date. The Company does not expect that the adoption of this guidance will have a material impact on the consolidated financial statements.
In March 2013, the FASB issued guidance related to foreign currency matters. The standard update addresses the accounting for the release of cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a business unit or a group of assets that do not produce a profit within a foreign entity. Under such circumstances, a parent company is required to release any related currency adjustments to earnings. The currency adjustment is released into earnings only if the sale or transfer results in a complete or substantially complete liquidation of the foreign entity in question. The standard update is effective for interim and annual reporting periods beginning after December 15, 2013. The Company does not expect that the adoption of this guidance will have a material impact on the consolidated financial statements.
In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income. The amendments in the update did not change the current requirements for reporting net income or other comprehensive income in financial statements. The new amendments require an organization to present (either on the face of the statement where net income is presented or in the notes) the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income if the item reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. Additionally, for other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP to provide additional detail about those amounts. The amendments are effective for reporting periods beginning after December 15, 2012. The adoption of this did not have a material impact on the Company’s financial position, results of operations or cash flows.
(s) Commitments and Contingencies
Liabilities for loss contingencies including environmental remediation costs arising from claims not within the scope of authoritative accounting guidance for asset retirement obligations, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Recoveries for environmental remediation costs from third parties are recorded when agreed upon with a third party.
(t) Comprehensive Income (Loss)
Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss). Other comprehensive income (loss) includes foreign currency translation gains and losses resulting from translating asset and liability accounts of our foreign subsidiaries from their local currencies at the exchange rates in effect at the balance sheet date, and gains or losses associated with pension or other post-retirement benefits, that are not recognized immediately as a component of net periodic benefit cost. We present components of other comprehensive income (loss) in the consolidated statements of operations and comprehensive income (loss), net of related tax effects.
(u) Business Combination
The cost of an acquired company is assigned to the tangible and intangible assets purchased and the liabilities assumed on the basis of their fair values at the date of acquisition. The determination of fair values of assets and liabilities acquired requires us to make estimates and use valuation techniques when a market value is not readily available. Any excess of purchase price over the fair value of net tangible and intangible assets acquired is allocated to goodwill. Transaction costs associated with business combinations are expensed as they are incurred.
(v) Restructuring
We recognize expenses related to employee termination benefits when the benefit arrangement is communicated to the employee and no significant future services are required of the employee. If an employee is required to render service until a specific termination date, which goes beyond the legal requirement or contractual notice period, in order to receive the termination benefits, the fair value of the associated liability would be recognized ratably over the future service period. Severance costs are determined in accordance with local statutory requirements and our policies.
We recognize the present value of facility lease termination obligations, net of estimated sublease income and other exit costs, when there are future lease payments with no future economic benefit. Sublease income is estimated based on current market rates for similar properties. If we are unable to sublease the facility on a timely basis or if we are forced to sublease the facility at lower rates due to changes in market conditions, we would adjust the restructuring liability accordingly.
(w) Reclassifications
Certain reclassifications have been made to our prior period consolidated financial information in order to conform to the current year presentation.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Combinations	'
	Business Combinations
	On May 24, 2013, each issued and outstanding share of common stock of the Company (other than shares of Company common stock held in the treasury of the Company or owned by Parent, affiliates of Parent, Merger Sub, a subsidiary of the Company or by stockholders who had validly exercised and perfected their appraisal rights under Delaware law), was converted into the right to receive $4.15 in cash, without interest and subject to any required withholding of taxes. The Company's common stock ceased to be traded on the New York Stock Exchange after close of market on that date. The Company continues its operations as a privately-held company. The Company filed with the Securities and Exchange Commission (the "SEC"), or has had filed on its behalf, a Form 15 and Form 25 to deregister the Company's common stock under Sections 12(b) and (g) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), respectively, which deregistration became effective 90 days after the filing of the applicable form. Further, the Company's reporting obligations under Section 15(d) of the Exchange Act on account of its common stock were suspended effective January 1, 2014, at which time the Company ceased filing periodic reports with the SEC on account of its common stock, but continues to have public reporting obligations with the SEC with respect to its 10.75% Senior Notes due 2018, as required by the indenture governing such Senior Notes.
	Prior to the Merger under our certificate of incorporation, there were 1,000,000,000 shares of common stock authorized and 100,000,000 shares of preferred stock authorized. In connection with the completion of the Merger,
	all shares of common stock outstanding at the time of the Merger were canceled and our certificate of incorporation was amended and restated to authorize only 100 shares of common stock, all of which are currently outstanding and owned by Parent. There are no shares of preferred stock authorized under our new amended and restated certificate of incorporation.
	We refer to the May 24, 2013 acquisition of EnergySolutions by Rockwell as the "Merger Transaction". The following events describe the transactions that occurred in connection with the Merger Transaction:
	•	Parent and EnergySolutions purchased and retired all of the Company's outstanding common stock as of the Merger Date and paid approximately $383.9 million in cash to the Company's stockholders. Of the total amount paid, EnergySolutions directly purchased 1.8 million shares for $7.3 million from cash on hand. The 1.8 million shares were issued as a result of accelerated vesting of previously issued restricted stock awards due to the change in control.
	•	Parent paid $10.9 million of Merger Transaction related costs on behalf of EnergySolutions. Payments made by Parent on the Company's behalf were accounted for as capital contributions. Of the $10.9 million transaction costs, approximately $3.1 million was capitalized as debt issuance costs and the remainder was expensed on the Merger Date and is included in the consolidated statements of operations and comprehensive income (loss) under selling, general and administrative ("SG&A") expenses.
	•	EnergySolutions incurred $32.6 million of Merger Transaction related expenses. These expenses were comprised primarily of employee incentive compensation and related payroll taxes of $21.0 million and professional fees of $11.6 million. These expenses were included in the consolidated statements of operations and comprehensive income (loss) under cost of revenue and SG&A expenses.
	The Merger Transaction was accounted for as a recapitalization, and accordingly, the Company will continue to apply its historical basis of accounting in its stand-alone financial statements after the Merger. This is based on our determination under Financial Accounting Standards Board ("FASB") accounting standards codification Topic 805 - Business Combinations, and SEC Staff Accounting Bulletin (SAB) No. 54, codified as Topic 5J, Push Down Basis of Accounting Required In Certain Limited Circumstances, that while the push down of Parent's basis in EnergySolutions is permissible, it was not required due to the existence of significant outstanding public debt securities at EnergySolutions.
	Subsequent Events
	On March 4, 2014, we acquired Studsvik, Inc.'s Tennessee processing facilities located in Erwin and Memphis, Tennessee and the exclusive rights to use Studsvik's patented Thermal Organic Reduction ("THOR") technology, in the commercial North America markets and China. Studsvik will retain patents and rights for THOR in other markets.
	The acquisition also included Studsvik's equity interest in the Semprasafe LLC, joint venture, in which the Company previously owned an equity interest of 49.0%. The aggregate purchase price for the acquisition was $23.1 million. No acquisition costs related to this acquisition were included in our consolidated results of operations for the year ended December 31, 2013.

Trust_Fund_Investments

Trust Fund Investments	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Trust Fund Investments	'
	Trust Fund Investments
	The NDT fund was established solely to satisfy obligations related to the D&D of the Zion Station. The NDT fund holds investments in marketable debt and equity securities directly and indirectly through commingled funds. Investments in the NDT fund are carried at fair value and are classified as trading securities. We consolidate the NDT fund as a VIE. We have a contractual interest in the NDT fund and this interest is a variable interest due to its exposure to the fluctuations caused by market risk. We are able to control the NDT fund by appointing the trustee and, subject to certain restrictions, we are able to direct the investment policies of the fund. We are the primary beneficiary of the NDT fund as we benefit from positive market returns and bear the risk of market losses.
	A portion of our NDT fund is invested in a securities lending program with the trustee of the NDT fund. The program authorizes the trustee of the NDT fund to loan securities that are assets of the NDT fund to approved borrowers. Borrowers have the right to sell or re-pledge the loaned securities. The trustee requires borrowers, pursuant to a security lending agreement, to deliver collateral to secure each loan. The securities are required to be collateralized by cash, U.S. government securities or irrevocable bank letters of credit. Initial collateral levels are no less than 102% and 105% of the market value of the borrowed securities for collateral denominated in U.S. and foreign currency, respectively.
	NDT fund investments consisted of the following (in thousands):
		As of December 31, 2013										As of December 31, 2012
		Amortized		Gross		Gross			Estimated			Amortized		Gross		Gross			Estimated
		cost		unrealized		unrealized			fair value			cost		unrealized		unrealized			fair value
				gains		losses								gains		losses
	Assets
	Receivables for securities sold	$	4,568	$	—	$	—		$	4,568		$	7,422	$	—	$	—		$	7,422
	Investments
	Corporate debt securities	201,377		8,050		(2,352		)	207,075			223,662		17,940		(575		)	241,027
	Equity securities	400		13		—			413			10,117		4,249		(61		)	14,305
	Direct lending securities	134,161		11,476		(3,387		)	142,250			98,138		6,026		(1,721		)	102,443
	Debt securities issued by states of the U.S.	23,725		761		(468		)	24,018			31,306		3,806		—			35,112
	Cash and cash equivalents	29,686		—		—			29,686			23,686		—		—			23,686
	Commingled funds	—		—		—			—			4,017		527		—			4,544
	Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	35,685		77		(855		)	34,907			166,925		3,912		(880		)	169,957
	Total investments	425,034		20,377		(7,062		)	438,349			557,851		36,460		(3,237		)	591,074
	Net assets held by the NDT fund	$	429,602	$	20,377	$	(7,062	)	442,917			$	565,273	$	36,460	$	(3,237	)	598,496
	Less: current portion								(112,475		)								(152,507		)
	Long-term investments								$	330,442									$	445,989
	Investments held by the NDT fund, net, totaled $442.9 million and $598.5 million as of December 31, 2013 and 2012, respectively, and are included in current and other long-term assets in the accompanying consolidated balance sheets, depending on the expected timing of usage of funds. We have withdrawn from the NDT fund approximately $161.6 million, $158.4 million and $161.5 million, for years ended December 31, 2013, 2012 and 2011, respectively, to pay for Zion Station D&D project expenses and estimated trust income taxes. In addition, we paid fees associated with the management of the NDT fund investments of approximately $4.4 million, $3.9 million and $4.5 million, for years ended December 31, 2013, 2012 and 2011, respectively. These fees are included in other income (expense), net, in the consolidated statements of operations and comprehensive income (loss).
	We record changes to the fair value of the NDT fund investments as unrealized gains or losses. For the years ended December 31, 2013, 2012 and 2011, we recorded $19.8 million of unrealized losses, $11.7 million of unrealized gains, and $3.0 million of unrealized gains, respectively. Investment income related to sales of investments, dividends and interest payments received from investments held by the NDT fund are recorded as realized gains or losses. For the years ended December 31, 2013, 2012 and 2011, we recorded realized gains in the amount of $30.4 million, $51.1 million and $55.5 million, respectively. Both, unrealized and realized gains and losses on the NDT fund investments are included in other income (expense), net, in the consolidated statements of operations and comprehensive income (loss).

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	We have implemented the accounting requirements for financial assets, financial liabilities, non-financial assets and non-financial liabilities reported or disclosed at fair value. The requirements define fair value, establish a three level hierarchy for measuring fair value in GAAP, and expand disclosures about fair value measurements. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that a company has the ability to access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs for the assets or liabilities.
	This hierarchy requires us to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while we believe our valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. Assets are classified in their entirety based on the lowest level of input that is significant to their fair value measurement.
	The carrying value of accounts receivable, accounts payable, and accrued expenses approximate their fair value principally because of the short-term nature of these assets and liabilities.
	The fair market value of our term loan is estimated utilizing market quotations for debt that have quoted prices in active markets. Since our term loan does not trade on a daily basis in an active market, the fair value estimates are based on market observable inputs based on borrowing rates currently available for debt with similar terms and average maturities and is categorized as Level 2. The fair value of our term loan is calculated by taking the mid-point of the trading prices and multiplying it by the outstanding principal balance of our term loan. The fair market value of our term loan was approximately $444.4 million as of December 31, 2013 and $508.6 million as of December 31, 2012. The carrying value of our term loan was $440.0 million as of December 31, 2013 and $527.0 million as of December 31, 2012.
	In the case of our senior notes, we estimate fair value based on quoted market prices from active markets as they are publicly traded and are categorized as Level 1. We had outstanding senior notes obligations with a carrying amount of $300.0 million as of December 31, 2013 and $300.0 million as of December 31, 2012, and with a fair market value of approximately $320.2 million as of December 31, 2013 and $283.5 million as of December 31, 2012.
	The following table presents the NDT fund investments measured at fair value (in thousands):
		As of December 31, 2013										As of December 31, 2012
		Total			Quoted Prices			Significant		Significant		Total		Quoted Prices		Significant		Significant
		Investments			in Active			Other		Unobservable		Investments		in Active		Other		Unobservable
		at Fair			Markets for			Observable		Inputs		at Fair		Markets for		Observable		Inputs
		Value			Identical			Inputs		Level 3		Value		Identical		Inputs		Level 3
					Assets			Level 2						Assets		Level 2		(revised)
					Level 1									Level 1
	Assets
	Receivables for securities sold	$	4,568		$	4,568		$	—	$	—	$	7,422	$	7,422	$	—	$	—
	Investments
	Cash and cash equivalents	29,686			29,686			—		—		23,686		23,686		—		—
	Fixed income securities(1)	266,000			34,907			231,093		—		446,096		125,605		320,491		—
	Equity securities(2)	413			413			—		—		14,305		14,305		—		—
	Direct lending securities(3)	142,250			—			—		142,250		102,443		—		—		102,443
	Units of participation(4)	—			—			—		—		4,544		—		4,544		—
	Total investments	438,349			65,006			231,093		142,250		591,074		163,596		325,035		102,443
	Net assets held by the NDT fund	$	442,917		$	69,574		$	231,093	$	142,250	$	598,496	$	171,018	$	325,035	$	102,443
	_____________________________
	-1	For fixed income securities, multiple prices from pricing services are obtained from pricing vendors whenever possible, which enables cross- provider validations in addition to checks for unusual daily movements. A primary price source is identified based on asset type, class or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary price source of a given security if the portfolio managers challenge an assigned price and the trustee determines that another price source is considered to be preferable. U.S. Treasury securities are categorized as Level 1 because they trade in a highly liquid and transparent market. Investments with maturities of three months or less when purchased, including certain short-term fixed income securities, are considered cash equivalents and are also categorized as Level 1. The fair values of fixed income securities, excluding U.S. Treasury securities, are based on evaluated prices that reflect observable market information, such as actual trade information or similar securities, adjusted for observable differences and are categorized in Level 2.
	-2	With respect to individually held equity securities, the trustee obtains prices from pricing services, whose prices are obtained from direct feeds from market exchanges. The fair values of equity securities held directly by the trust fund are based on quoted prices in active markets and are categorized in Level 1. Equity securities held individually are primarily traded on the New York Stock Exchange and NASDAQ Global Select Market, which contain only actively traded securities due to the volume trading requirements imposed by these national securities exchanges.
	-3	Direct lending securities are investments in managed funds that invest in private companies for long-term capital appreciation. The fair value of these securities is determined using either an enterprise value model or a bond valuation model. The enterprise value model develops valuation estimates based on valuations of comparable public companies, recent sales of private and public companies, discounting the forecasted cash flows of the portfolio company, estimating the liquidation or collateral value of the portfolio company or its assets, considering offers from third parties to buy the portfolio company, its historical and projected financial results, as well as other factors that may impact value. Significant judgment is required in the applications of discounts or premiums applied to the prices of comparable companies for factors such as size, marketability and relative performance. Under the bond valuation model, expected future cash flows are discounted using a discount rate. The discount rate is composed of a market based rate for similar credits in the public market and an internal credit rate based on the underlying risk of the credit. Investments in direct lending funds are categorized as Level 3 because the fair value of these securities is based largely on inputs that are unobservable and also utilize complex valuation models. Investments in direct lending securities typically cannot be redeemed until maturity of the term loan.
	Management determines the value of Level 3 investments by considering third party valuations and have concluded that quantitative information about significant unobservable inputs used in valuing these investments is not reasonably available. This includes information regarding the sensitivity of the fair values to changes in the unobservable inputs. We obtain annual valuations from the fund managers and gain an understanding of the inputs and assumptions used in preparing the valuations. We also conclude on the reasonableness of the fair value of these investments. We obtain quarterly reports from the fund managers and review for consistency and reasonableness with regards to the valuations of these investments that were analyzed at the most recent year-end.
	-4	Units of participation, which are similar to mutual funds, are maintained by investment companies and hold certain investments in accordance with stated fund objectives. The fair values of short-term commingled funds held within the trust funds, which generally hold short-term fixed income securities and are not subject to restrictions regarding the purchase or sale of shares, are derived from observable prices. Units of participation are categorized as Level 2 because the fair value of these securities is based primarily on observable prices of the underlying securities.
	The following table presents the rollforward for Level 3 assets and liabilities measured at fair value on a recurring basis (in thousands):
	Direct Lending Securities	December 31,			December 31,
		2013			2012
	Beginning balance	$	102,443		$	61,998
	Purchases and issuances	76,505			82,285
	Sales, dispositions and settlements	(42,167		)	(39,706		)
	Realized gains and losses	1,685			(2,940		)
	Change in unrealized gains and losses	3,784			806
	Ending balance	$	142,250		$	102,443

Joint_Ventures

Joint Ventures	12 Months Ended
	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Joint Ventures	'
	Joint Ventures
	We use the equity method of accounting for our unconsolidated joint ventures. Under the equity method, we recognize our proportionate share of the net earnings of these joint ventures as a single line item under "Equity in income of unconsolidated joint ventures" in our consolidated statements of operations and comprehensive income (loss). In accordance with authoritative guidance, we analyzed all of our joint ventures and classified them into two groups: (a) joint ventures that must be consolidated because we hold the majority voting interest, or because they are VIEs of which we are the primary beneficiary; and (b) joint ventures that do not need to be consolidated because we hold only a minority voting or other ownership interest, or because they are VIEs of which we are not the primary beneficiary. Based on our assessment, we concluded that no unconsolidated joint ventures should be consolidated and that no consolidated joint ventures should be deconsolidated for the year ended December 31, 2013.
	The table below presents unaudited financial information, for our unconsolidated joint ventures (in thousands):
		December 31,		December 31,
		2013		2012
	Current assets	$	55,229	$	49,979
	Current liabilities	30,606		25,127
		For The Years Ended December 31,
		2013		2012		2011
	Revenue	$	133,891	$	153,692	$	158,729
	Gross profit	14,576		20,547		31,940
	Net income	13,571		20,001		31,324
	Net income attributable to EnergySolutions	4,465		7,392		11,103
	Our percentage of ownership of unconsolidated joint ventures as of December 31, 2013 was:
		Percentage of
		Ownership
	Global Threat Reduction Solutions, LLC	49	%
	LATA/Parallax Portsmouth, LLC	49	%
	SempraSafe, LLC	49	%
	TPMC EnergySolutions Environmental Services, LLC	49	%
	Washington River Protection Solutions, LLC	40	%
	Weskem, LLC	27.6	%
	Idaho Treatment Group, LLC	15	%
	West Valley Environmental Services LLC	10	%
	As of December 31, 2013 and 2012, we had investments in unconsolidated joint ventures of $6.1 million and $6.4 million, respectively, which are included in other long term assets in the consolidated balance sheets. For the years ended December 31, 2013, 2012, and 2011,we received cash dividend distributions from our unconsolidated joint ventures of $4.8 million, $7.5 million and $12.1 million, respectively.

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment	'
	Property, Plant and Equipment
	Property, plant and equipment consist of the following (in thousands):
		31-Dec-13			31-Dec-12
	Land and land improvements	$	29,203		$	28,679
	Buildings and improvements	38,194			37,233
	Computer hardware and software	23,306			24,135
	Furniture and fixtures	4,067			5,085
	Landfill	69,876			70,634
	Machinery and equipment	99,533			93,724
	Trucks and vehicles	14,574			13,844
	Leasehold improvements	8,296			8,235
	Capital leases	8,005			6,950
	Construction in progress	11,667			9,149
		306,721			297,668
	Less accumulated depreciation and amortization	(192,245		)	(179,924		)
	Property, plant and equipment, net	$	114,476		$	117,744
	We recorded $16.8 million, $23.7 million and $22.3 million of depreciation expense for the years ended December 31, 2013, 2012 and 2011, respectively. Depreciation expense is included in cost of revenue and SG&A expense in the accompanying consolidated statements of operations and comprehensive income (loss).
	During 2012, we performed a comprehensive review of our computer software and determined that the fair market value of some software licenses was lower than their carrying value. As a result, we wrote down $3.3 million of certain licenses related to our enterprise resource planning system and various modules or ancillary systems. This amount is included in corporate selling, general and administrative expenses in the consolidated statements of operations and comprehensive income (loss).
	A detail of the property, plant and equipment acquired under capital leases was as follows (in thousands):
		31-Dec-13			31-Dec-12
	Computer equipment	$	4,106		$	3,353
	Machinery and equipment	—			668
	Trucks and vehicles	3,899			2,929
		8,005			6,950
	Less accumulated amortization	(4,904		)	(4,439		)
	Machinery and equipment	$	3,101		$	2,511
	Amortization expense of assets recorded under capital leases is included in depreciation expense. For the years ended December 31, 2013 and 2012, we entered into $1.3 million and $0.2 million, respectively, of capital lease obligations.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	Goodwill
	Goodwill consisted of the following (in thousands):
		Gross		Foreign			Accumulated Impairment Losses			Total Goodwill
		Carrying		Currency
		Amount		Translation
	Beginning Balance at December 31, 2012	$	526,334	$	(8,726	)	$	(209,000	)	$	308,608
	Acquisitions	—		—			—			—
	Other adjustments	—		900			—			900
	Ending balance at December 31, 2013	$	526,334	$	(7,826	)	$	(209,000	)	$	309,508
	As of December 31, 2013 and December 31, 2012, we had recorded $309.5 million and $308.6 million, respectively, of goodwill related to domestic and foreign acquisitions. Goodwill related to the acquisitions of foreign entities is translated into U.S. dollars at the exchange rate in effect at the balance sheet date. For the years ended December 31, 2013 and December 31, 2012, we recorded $0.9 million and $2.2 million of translation gains, respectively, related to goodwill denominated in foreign currencies. The related translation gains and losses are included as a separate component of other comprehensive income (loss) within the consolidated statements of operations and comprehensive income (loss).
	For impairment analysis, we allocate goodwill at the reporting unit level. In determining our reporting units, we considered how the business is managed at the segment operating level, the financial information available to management to operate the business, and the group of business leaders making decisions on allocation of resources and performance assessment of the Company. Our reporting units are: Projects, Products, LP&D and International.
	We test our goodwill for impairment annually, as of April 1, on a reporting unit basis, or more often when events occur or circumstances change that would, more likely than not, reduce the fair value of a reporting unit below its carrying value. In assessing our goodwill for impairment, we first perform a qualitative assessment. If the qualitative assessment is not conclusive and it is necessary to calculate the fair value of a reporting unit, then we utilize a two-step process to test goodwill for impairment. We consider such factors as: macroeconomic and market conditions, industry specific considerations, cost factors, overall financial performance, relevant entity-specific events (such as the Merger Transaction closed in May 2013), share price considerations and other factors as deemed necessary. As of December 31, 2013, there were no events or circumstances that indicated that impairment existed in any of our reporting units.
	During the second quarter of 2012, due to changes in management, decreased earnings guidance and a debt rating downgrade our stock price and corresponding market capitalization declined significantly. These events prompted us to perform interim goodwill impairment tests as of both June 30, 2012 and September 30, 2012. The first step of the interim impairment assessment was calculated based on new management's adjusted forecasts and estimated future cash flows. The calculated estimated fair value of each of the reporting units, including goodwill, exceeded their carrying value; therefore, the second step was not required. No impairment charges were recorded for the year ended December 31, 2012.
	During 2011, we recorded a $174.0 million non-cash goodwill impairment charge. Of the $174.0 million, $35.0 million was related to Projects and $139.0 million was related to LP&D. Factors considered in determining the impairment included a decline in our stock price and the continued deterioration of the market and economic conditions. We measured the fair value of the Projects and LP&D reporting units by using management's business plans and projections as the basis for expected cash flows for the next five years, a 2.5% estimated residual growth rate for future years and a 17% weighted average discount rate. This non-cash charge reduced goodwill recorded in connection with previous acquisitions and did not impact our overall business operations, cash position, operating cash flow or debt covenants.

Other_Intangible_Assets

Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'
Other Intangible Assets	'
	Other Intangible Assets
	Other intangible assets consisted of the following (in thousands):
		As of December 31, 2013								As of December 31, 2012
		Gross			Accumulated			Weighted		Gross			Accumulated				Weighted
		Carrying			Amortization			Average		Carrying			Amortization				Average
		Amount						Remaining		Amount							Remaining
								Useful Life									Useful Life
	Permits	$	243,173		$	(86,263	)	15.8 years		$	243,130		$	(76,406	)		16.9 years
	Customer relationships	161,903			(107,718		)	4.8 years		161,429			(93,552		)		5.6 years
	Technology and other	15,490			(12,224		)	2.1 years		15,490			(10,540		)		3.1 years
	Total intangibles	$	420,566		$	(206,205	)	12.8 years		$	420,049		$	(180,498	)		13.4 years
	For the years ended December 31, 2013 and 2012, we recorded $0.6 million and $2.5 million, respectively, of translation gains related to other intangible assets denominated in foreign currencies. Translation gains and losses are included as a separate component of other comprehensive income (loss) within the consolidated statements of operations and comprehensive income (loss).
	All of our other intangible assets are subject to amortization. Amortization expense was $25.8 million, $26.0 million and $25.7 million for the years ended December 31, 2013, 2012 and 2011, respectively. Amortization expense is included in cost of revenue and SG&A expenses within the consolidated statement of operations and comprehensive income (loss).
	Estimated annual amortization expense for each of the next five years is as follows (in thousands):
			2014			2015			2016			2017				2018
	Estimated annual amortization expense		$	24,667		$	21,690		$	19,660		$	18,004			$	17,040

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Long-Term Debt
	Our outstanding long-term debt consists of the following (in thousands):
		December 31,			December 31,
		2013			2012
	Term loan facilities due through 2016(1)	$	440,000		$	527,000
	Term loan unamortized discount	(5,519		)	(8,741		)
	Senior notes, 10.75% due through 2018	300,000			300,000
	Senior notes unamortized discount	(2,667		)	(3,090		)
	Total debt	731,814			815,169
	Less: current portion	(65,000		)	(16,592		)
	Total long-term debt	$	666,814		$	798,577
	______________________________
	-1	The variable interest rate on borrowings under our senior secured credit facility was 7.25% as of December 31, 2013 and 6.25% as of December 31, 2012.
	On August 13, 2010, the Company entered into a senior secured credit facility with JPMorgan Chase Bank, N.A., as the administrative agent and collateral agent, consisting of a senior secured term loan in an aggregate principal amount of $560.0 million at a discount rate of 2.5% and a senior secured revolving credit facility with availability of $105.0 million, of which $58.9 million was used to fund letters of credit issued as of December 31, 2013. Borrowings of $289.7 million and $310.6 million, respectively, were held in a restricted cash account as collateral for the Company’s reimbursement obligations with respect to deposit letters of credit as of December 31, 2013 and December 31, 2012.
	Borrowings under the senior secured credit facility bear interest at a rate equal to: (a) Adjusted LIBOR plus 5.00% (subject to a LIBOR floor of 1.75%), or ABR plus 4.00% in the case of the senior secured term loan; (b) Adjusted LIBOR plus 4.50% (subject to a LIBOR floor of 1.75%), or ABR plus 3.50% in the case of the senior secured revolving credit facility, and (c) a per annum fee equal to the spread over Adjusted LIBOR under the senior secured revolving credit facility, along with a fronting fee and issuance and administration fees in the case of revolving letters of credit.
	On February 15, 2013, we entered into Amendment No. 2 to the Credit Agreement and Consent and Waiver (the "Second Loan Amendment"). The Second Loan Amendment became effective on May 24, 2013 upon the consummation of the Merger. Pursuant to the Second Loan Amendment, the lenders and the administrative agent consented to i) a waiver of the change of control provisions and certain other covenants and provisions under the senior secured credit facility; ii) any repayment of our 10.75% Senior Notes due 2018, provided that any payments are funded from equity contributions made to us by ECP or its affiliates; iii) an extension to the maturity date of our senior secured revolving credit facility, subject to certain conditions and acceptance by the extending revolving lenders; and iv) 1% prepayment premium if any senior secured term loan is refinanced prior to the date that is one year following the execution date of the Second Loan Amendment. On May 24, 2013, upon the closing of the Merger and pursuant the Second Loan Amendment, the interest rate on our senior secured term loan was increased by 0.50%.
	On October 11, 2013, we entered into Amendment No. 3 to the Credit Agreement (the "Third Loan Amendment"). The Third Loan Amendment extended the mandatory debt prepayment deadline on our collective senior debt to 270 days after the Third Loan Amendment's effective date of October 15, 2013, and increased the applicable margin for our senior secured term loan and revolving credit facility by 0.50% until we reduce the aggregate outstanding amount of senior secured term loan under the amended senior secured credit facility and our 10.75% Senior Notes due 2018 to $675.0 million or less. In the event that the outstanding principal amount of our collective senior debt exceeds $675.0 million at the end of 180 days from the Third Loan Amendment's effective date, the applicable margin for our senior secured credit facility will be increased by an additional 0.25%. Upon the date that the aggregate outstanding amount of senior debt is $675.0 million or less, the applicable margin for our senior secured credit facility will be decreased by 0.50%, back to the interest rates prior to the effective date of the Third Loan Amendment. As of December 31, 2013, the aggregate outstanding principal amount of our senior debt was $740.0 million. As such, as of December 31, 2013, we had a mandatory principal repayment of $65.0 million due by July 15, 2014. Subsequent to year end, we made additional principal payments totaling $87.0 million, with funds released from our restricted cash account, bringing our senior debt balance down to $653.0 million. As a result, we have met the requirements of the Third Loan Amendment and the interest rates on the senior secured term loan and revolving credit facility decreased to 6.75% and 6.25%, respectively.
	During 2013, we paid to our lenders $7.6 million in consent fees in connection with the execution of amendments to our senior secured credit facility, all of which were capitalized and are included in other noncurrent assets within the consolidated balance sheet as of December 31, 2013. Parent contributed $3.1 million to fund the payment of these consent fees. We also paid $8.0 million of lead arranger banker fees, all of which were included in other income (expense), net, within the consolidated statement of operations and comprehensive income (loss) for the year ended December 31, 2013. Parent contributed $4.3 million to fund the payment of these lead arranger banker fees.
	The senior secured term loan amortizes in equal quarterly installments payable on the last day of each calendar quarter with the balance being payable on August 13, 2016. In addition to the scheduled repayments, we are required to prepay borrowings under the senior secured term loan with (1) 100% of the net cash proceeds received from non-ordinary course asset sales or other dispositions, or as a result of a casualty or condemnation, subject to reinvestment provisions and other customary adjustments, (2) 100% of the net proceeds received from the issuance of debt obligations other than certain permitted debt obligations, (3) 50% of excess cash flow (as defined in the senior secured credit facility), if the leverage ratio is equal to or greater than 3.0 to 1.0, or 25% of excess cash flow if the leverage ratio is less than 3.0 to 1.0 but greater than 1.0 to 1.0, reduced by the aggregate amount of optional and mandatory prepayments made on the senior secured term loan during the fourth quarter of the applicable fiscal year. If the leverage ratio is equal to or less than 1.0 to 1.0, we are not required to prepay the senior secured term loan. The excess cash flow calculations (as defined in the senior secured credit facility), are prepared annually as of the last day of each fiscal year. Prepayments of term loan resulting from the excess cash flow calculations are due annually five days after the date that the Annual Report on Form 10-K for such fiscal year is filed with the SEC. Each optional and mandatory prepayment is applied first, in direct order of maturities, to the next four scheduled principal repayment installments of the senior secured term loan and second, to the other principal repayment installments of senior secured term loan on a pro rata basis. All mandatory quarterly term loan prepayment requirements have been satisfied.
	During 2013, we made principal repayments totaling $87.0 million of which $14.4 million was funded by ECP through equity contributions to the Company and $16.6 million was related to the mandatory principal repayment based on our excess cash flow for the year ended December 31, 2012. We did not have a mandatory principal repayment based on our excess cash flow due for the year ended December 31, 2013. We made no principal debt payments during 2012. For the year ended December 31, 2011, we made principal repayments totaling $30.2 million of which $26.0 million were optional. Each optional prepayment is applied first, in direct order of maturities, to the next four scheduled principal repayment installments of the senior secured term loan and second, to the other principal repayment installments of senior secured term loans on a pro rata basis.
	Scheduled annual principal payments of our outstanding long-term debt for the years subsequent to December 31, 2013 are as follows (in thousands):
	2014	$	65,000
	2015	—
	2016	375,000
	2017	—
	2018	300,000
	Outstanding long-term debt	740,000
	Less: unamortized discounts	(8,186		)
	Long-term debt net of discounts	$	731,814
	The senior secured credit facility requires the Company to maintain a leverage ratio (based upon the ratio of indebtedness for money borrowed to consolidated adjusted EBITDA, as defined in the senior secured credit facility) and an interest coverage ratio (based upon the ratio of consolidated adjusted EBITDA to consolidated cash interest expense), both of which are calculated quarterly. Failure to comply with these financial ratio covenants would result in an event of default under the senior secured credit facility and, absent a waiver or an amendment from the lenders, preclude us from making further borrowings under the senior secured credit facility and permit the lenders to accelerate repayment of all outstanding borrowings under the senior secured credit facility. Based on the formulas set forth in the senior secured credit facility, we are required to maintain a maximum total leverage ratio of 4.0 for the quarter ending December 31, 2013, which is reduced by 0.25 on an annual basis through the maturity date. We are required to maintain a minimum cash interest coverage ratio of 2.00 from the quarter ended December 31, 2013 through the quarter ended September 30, 2014 and 2.25 through the maturity date. As of December 31, 2013, our total leverage and cash interest coverage ratios were 3.17 and 2.25, respectively.
	The senior secured credit facility also contains a number of affirmative and restrictive covenants including limitations on mergers, consolidations and dissolutions, sales of assets, investments and acquisitions, indebtedness, liens, affiliate transactions, and dividends and restricted payments. Under the senior secured credit facility, we are permitted maximum annual capital expenditures of $40.0 million for 2013 and each year thereafter, plus for each year the lesser of (1) a one year carryforward of the unused amount from the previous fiscal year and (2) 50% of the amount permitted for capital expenditures in the previous fiscal year. The senior secured credit facility contains events of default for non-payment of principal and interest when due, a cross-default provision with respect to other material indebtedness having an aggregate principal amount of at least $5.0 million and an event of default that would be triggered by a change of control, as defined in the senior secured credit facility. Capital expenditures for the year ended December 31, 2013 were $15.2 million. As of December 31, 2013, we were in compliance with all of the covenants under our senior secured credit facility.
	The obligations under the senior secured credit facility are secured by a lien on substantially all of the assets of the Company and each of the Company’s domestic subsidiary guarantors, including a pledge of equity interests with the exception of the equity interests in our ZionSolutions subsidiary, which includes investments in the NDT fund of approximately $442.9 million as of December 31, 2013, and other special purpose subsidiaries, whose organizational documentation prohibits or limits such pledge.
	On August 13, 2010, we completed a $300.0 million private offering of 10.75% senior notes at a discount rate of 1.3%. The senior notes are governed by an indenture among EnergySolutions and Wells Fargo Bank, National Association, as trustee. Interest on the senior notes is payable semiannually in arrears on February 15 and August 15 of each year beginning on February 15, 2011. The senior notes rank in equal right of payment to all existing and future senior debt and senior in right of payment to all future subordinated debt. In May 2011, we filed a registration statement under the Securities Act, pursuant to a registration rights agreement entered into in connection with the senior notes offering. The SEC declared the registration statement relating to the exchange offer effective on May 27, 2011, and the exchange of the registered senior notes for the unregistered senior notes was consummated on May 31, 2011. We did not receive any proceeds from the exchange offer transaction.
	At any time prior to August 15, 2014, we are entitled to redeem all or a portion of the senior notes at a redemption price equal to 100% of the principal amount of the senior notes plus an applicable make-whole premium, as of, and accrued and unpaid interest to, the redemption date. In addition, on or after August 15, 2014, we may redeem all or a portion of the senior notes at the following redemption prices during the 12-month period commencing on August 15 of the years set forth below, plus accrued and unpaid interest to the redemption date.
	Period	Redemption
		Price
	2014	105.375	%
	2015	102.688	%
	2016 and thereafter	100	%
	The senior notes are guaranteed on a senior unsecured basis by all of our domestic restricted subsidiaries that guarantee the senior secured credit facility. The senior notes and related guarantees are effectively subordinated to our secured obligations, including the senior secured credit facility and related guarantees, to the extent of the value of assets securing such debt. The senior notes are structurally subordinated to all liabilities of each of our subsidiaries that do not guarantee the senior notes. If a change of control of the Company occurs, each holder will have the right to require that we purchase all or a portion of such holder’s senior notes at a purchase price of 101% of the principal amount, plus accrued and unpaid interest to the date of the purchase. The indenture contains, among other things, certain covenants limiting our ability and the ability of one restricted subsidiary to incur or guarantee additional indebtedness, pay dividends or make other restricted payments, make certain investments, create or incur liens, sell assets and subsidiary stock, transfer all or substantially all of our assets, or enter into a merger or consolidation transactions, and enter into transactions with affiliates. Our credit facility allows for restricted payments not to exceed $10.0 million during any period of four consecutive fiscal quarters and an additional basket for restricted payments not to exceed 30% of the cumulative available excess cash flow at any time, with such restricted payments permanently reducing the 30% basket.
	Each subsidiary co-issuer and guarantor of our senior notes is exempt from reporting under the Exchange Act, pursuant to Rule 12h-5 under the Exchange Act, as the subsidiary co-issuer and each of the subsidiary guarantors is 100% owned by us, and the obligations of the co-issuer and the guarantees of our subsidiary guarantors are full and unconditional and joint and several. There are no significant restrictions on our ability or any subsidiary guarantor to obtain funds from its subsidiaries.
	For the years ended December 31, 2013, 2012 and 2011, we made cash interest payments totaling $70.3 million, $71.5 million, and $73.9 million respectively, related to our outstanding debt obligations as of those dates.

Notes

(Notes)	12 Months Ended
	Dec. 31, 2013
Payables and Accruals [Abstract]	'
Accrued Expenses and Other Current Liabilities	'
	Accrued Expenses and Other Current Liabilities
	Accrued expenses and other current liabilities consist of the following (in thousands):
		December 31,		December 31,
		2013		2012
	Accrued project and contract costs	$	55,364	$	67,880
	Salaries and labor related expenses	80,628		67,214
	Taxes payable (1)	28,829		23,617
	U.K. severance	23,055		5,695
	Interest payable on long term debt obligations	12,483		13,421
	Professional fees	2,867		3,241
	Other accrued expenses	4,951		12,478
		$	208,177	$	193,546
	______________________________
	(1)Includes federal and state income tax, property tax, domestic and international sales taxes and waste taxes.

EquityBased_Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity-Based Compensation	'
	Equity-Based Compensation
	Stock Options and Restricted Stock Grants
	On May 22, 2013, the board of directors and stockholders of Parent approved the Stock Option Plan of Rockwell Holdco, Inc. (the "Rockwell Plan"), pursuant to which stock options may be granted to the employees, consultants, non-employee directors of Parent or its subsidiaries. Under the Rockwell Plan, 36,087 shares of Parent common stock have been reserved for issuance. As of December 31, 2013, 34,687 options had been issued under the Rockwell Plan to employees of the Company. Any option granted under the Rockwell Plan will be subject to terms and conditions contained in a written stock option agreement, and any shares of Parent common stock received upon exercise of an option under the Rockwell Plan will be subject to Parent’s Stockholders Agreement. The board of directors of Parent administers the Rockwell Plan and may amend, suspend or terminate the Rockwell Plan at any time.
	In connection with our initial public offering, we adopted the EnergySolutions, Inc. 2007 Equity Incentive Plan (the "former Plan"). The former Plan had 10,440,000 shares reserved for issuance of stock options, restricted stock and other equity based awards to directors, officers, employees and consultants. There were 4,563,819 shares available for future issuance under the former Plan as of December 31, 2012. No shares from the former Plan were granted during 2013. On May 24, 2013, as a result of the completion of the Merger, a change in control occurred that resulted in immediate vesting of all outstanding share-based awards. The acceleration in vesting resulted from a preexisting change in control provision included in the terms of the awards issued under the former Plan. For the year ended December 31, 2013, we made payments of approximately $21.0 million to grant holders due to the change in control provision. The former Plan was terminated on May 24, 2013.
	We recognize equity based compensation expense over the instruments' vesting periods based on the instruments' fair values on the measurement date, in SG&A expenses in the consolidated statements of operations and comprehensive income (loss). For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million and $4.0 million and $10.0 million, respectively, of non-cash stock based compensation expense related to stock options and restricted stock issued under the Rockwell Plan and the former Plan.
	The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model. The key assumptions used in the Black-Scholes model for options granted were as follows:
		2013		2012		2011
	Expected life of option (years)	6.5		6		6
	Risk-free interest rate	1.39%		1.10%		2.1% to 2.7%
	Expected volatility	72.20%		44.30%		42.4% to 46.0%
	The expected life of the options represents the period of time that the options granted are expected to be outstanding. We are currently using the simplified method to calculate expected holding periods, which is based on the average term of the options and the weighted-average graded vesting period, because we do not have sufficient exercise history to calculate an expected holding period. Expected volatility is based on our historical volatility. The risk-free rate is based on the U.S. Treasury rate for the expected life at the time of grant. Our expected forfeiture rate is based on historical rates experienced by us as well as our expectations of future forfeiture rates and represents management's best estimate of forfeiture rates that we expect to occur.
	A summary of stock option activity is presented below:
		Options			Weighted		Weighted	Aggregate
					average		average	intrinsic value (in thousands)
					exercise price		remaining
							life (years)
	Outstanding, December 31, 2010	6,602,167			$	18.26	—	$	33.1
	Granted	484,600			6.22		—	—
	Exercised	(10,350	)		5.55		—	—
	Forfeited or expired	(545,692	)		14.7		—	—
	Outstanding, December 31, 2011	6,530,725			17.55		—	—
	Granted	506,000			4.21		—	—
	Exercised	—			—		—	—
	Forfeited or expired	(4,539,129	)		22.2		—	—
	Outstanding, December 31, 2012	2,497,596			6.29		6.91	—
	Granted	34,687			1,000		9.4	—
	Exercised	—			—		—	—
	Forfeited or expired	(2,497,596	)		6.29		—	—
	Outstanding, December 31, 2013	34,687			1,000			—
	Options vested and expected to vest, December 31, 2013	34,687			—		—	—
	Options exercisable, December 31, 2013	—			—		—	—
	As of December 31, 2013, we had $20.2 million of unrecognized compensation expense related to outstanding stock options, which will be recognized over a weighted-average period of 4.4 years. The weighted average grant date fair value of options granted for the years ended December 31, 2013, 2012 and 2011,was $658.7, $1.82, and $2.78, respectively.
	A summary of restricted stock activity is presented below:
		Shares			Weighted average
					grant-date
					fair value
	Non-vested shares, December 31, 2010	708,898			5.6
	Granted	694,300			5.53
	Vested	(302,928	)		4.99
	Forfeited	(102,509	)		5.72
	Non-vested shares, December 31, 2011	997,761			5.81
	Granted	861,888			3.87
	Vested	(387,507	)		5.31
	Forfeited	(177,949	)		4.83
	Non-vested shares, December 31, 2012	1,294,193			4.8
	Granted	—
	Vested	(1,264,122	)		4.8
	Forfeited	(30,071	)
	Non-vested shares, December 31, 2013	—			—
	Phantom Stock
	Phantom stock is a method for us to reward employees if the Company performs well financially. Phantom stock provides a cash or stock award based on the value of a number of shares to be paid out at the end of a specified period of time. We have awarded phantom stock to certain non-senior executives and senior executives of the Company.
	Phantom stock awards granted to non-senior executives are performance share units payable in cash based upon the Company's closing stock price on the vesting date. Because these are paid in cash, these awards are revalued at the end of each reporting period and therefore, are classified as liabilities.
	Phantom stock awards granted to certain senior executives include a cash component and an equity component. The awards payable in cash are revalued at each reporting period. Phantom stock awards granted with an equity component that is payable in restricted stock rather than cash are valued at the grant date. We use the Monte Carlo model to estimate the fair value of these awards and we amortize the estimated fair value over the vesting period using the accelerated attribution method.
	The key assumptions used in the Monte Carlo model for phantom stock awards were as follows:
		2012
	Expected life of Phantom Stock Units (in years)	3.0 to 6.0
	Risk-free interest rate	0.41%
	Expected volatility	68.40%
	Lack of marketability discount (for equity phantom stock awards)	15%
	Amortization of phantom stock awards to be settled in cash is included in cost of revenue and SG&A expenses in the consolidated statements of operations and comprehensive income (loss). For the years ended December 31, 2013, 2012 and 2011, we recorded $19.8 million, $2.9 million, and $0.3 million respectively, of compensation expense related to these awards.
	Amortization of equity based phantom stock awards is included in SG&A expenses in the consolidated statements of operations and comprehensive income (loss). For the years ended December 31, 2013, 2012 and 2011, we recorded $0.9 million, $0.1 million, and $0 million, respectively, of non-cash compensation expense related to these awards.
	Compensation expense related to phantom stock awards has been fully recognized as of December 31, 2013. As of December 31, 2013 and December 31, 2012, we had recorded liabilities of $6.5 million and $2.5 million, respectively, related to unpaid vested phantom stock awards, which are included in accrued expenses and other current liabilities in the consolidated balance sheets. No Phantom stock shares are outstanding as of December 31, 2013.

Facility_and_Equipment_Deconta

Facility and Equipment Decontamination and Decommissioning	12 Months Ended
	Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Facility and Equipment Decontamination and Decommissioning	'
	Facility and Equipment Decontamination and Decommissioning
	Our facility and equipment D&D liabilities consist of the following (in thousands):
		December 31,			December 31,
		2013			2012
	Facilities and equipment ARO—Zion Station	$	409,190		$	553,302
	Facilities and equipment ARO—Clive, UT	28,106			29,300
	Facilities and equipment ARO—other	35,446			35,757
	Total facilities and equipment ARO	472,742			618,359
	Barnwell Closure	3,822			5,845
		476,564			624,204
	Less: current portion	(98,175		)	(138,757		)
		$	378,389		$	485,447
	We recognize AROs when we have a legal obligation to perform D&D and removal activities upon retirement of an asset. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset, in the case of all our AROs except the Zion Station ARO.
	The ARO established in connection with the Zion Station project differs somewhat from our traditional AROs. The assets acquired in the Zion Station transaction have no fair value, no future useful life and are in a shut-down, non-operating state. As a result, the ARO established in connection with the Zion Station project is not accompanied by a related depreciable asset. Also, since we perform most of the work related to the Zion Station ARO with internal resources, we recognized an ARO gain for the difference between our actual costs incurred and the recorded ARO which includes an element of profit. Due to the nature of this contract and the purpose of the license stewardship initiative, we have presented this gain in cost of revenue rather than as a credit to operating expense, as we would with our other AROs.
	Subsequent to the initial measurement, the ARO is adjusted at the end of each period to reflect the passage of time and changes in the estimated future cash flows underlying the obligations. Changes to our ARO liabilities were as follows (in thousands):
		December 31,			December 31,
		2013			2012
	Beginning Balance as of January 1	$	618,359		$	750,649
	Liabilities incurred	—			187
	Liabilities settled	(171,167		)	(159,776		)
	Accretion expense	26,308			30,017
	ARO estimate adjustments	(758		)	(2,718		)
	Ending liability	$	472,742		$	618,359
	Changes to the ARO liability due to accretion expense and changes in cost estimates are recorded in cost of revenue in our consolidated statements of operations and comprehensive income (loss). Accretion expense for the years ended December 31, 2013, 2012 and 2011, was $26.3 million, $30.0 million and $32.7 million, respectively. Cost estimate adjustments for the years ended December 31, 2013, 2012 and 2011, were $0.8 million, $2.7 million and $97.1 million, respectively, of which $0 million, a favorable $8.7 million, and an unfavorable $94.9 million, respectively, are related to the Zion Station project. Cost adjustments related to the Zion Station project are due primarily to changes in expected timing of cash flows and increases in estimated future costs from original estimates in the areas of project management, direct task work, dry fuel storage equipment costs and/or the acceleration of certain license termination activities originally planned for later in the project. Cost adjustments related to our other AROs are due primarily to changes in estimated rates for labor and equipment and the addition of certain pieces of equipment requiring disposal. We evaluate our estimated costs at least annually and additional estimated cost changes could occur in the future.
	Our ARO is based on a cost estimate for a third party to perform the D&D work. This estimate is inflated, using an inflation rate, to the expected time at which the D&D activity will occur, and then discounted back, using our credit adjusted risk free rate, to the present value. The inflation rate and credit-adjusted risk-free discount rate used to calculate the ARO estimate is as follows:
		Inflation Rate		Credit-Adjusted
				Risk-Free
				Discount Rate
	31-Dec-13	2.27% - 2.60%		2.84% - 10.88%
	31-Dec-12	2.27% - 2.78%		2.84% - 9.09%
	Our processing and disposal facilities operate under licenses and permits that require financial assurance for landfill closure, post-closure and remediation obligations. We provide for these requirements through a combination of restricted cash, cash deposits, escrow accounts, letters of credit, surety bonds and/or insurance policies.We also have funds held in trusts for completion of various site clean-up projects. To fund our obligation to clean and remediate our Tennessee facilities and equipment, we have also purchased insurance policies. These assurance mechanisms do not extinguish our D&D liabilities.
	In connection with the execution of the Exelon Agreements, and in fulfillment of NRC regulations, we secured a $200.0 million letter of credit facility to further support the D&D activities at Zion Station. As of December 31, 2013 and December 31, 2012, we had restricted cash balances of $293.9 million and $316.8 million, respectively, of which $285.5 million and $307.9 million were collateralizing reimbursement obligations with respect to letters of credit and surety bonds issued to support closure, post-closure and remediation obligations. These balances were obtained with proceeds from our senior secured credit facility and are included in non-current assets in the accompanying consolidated balance sheets.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Income before provision for income taxes consists of the following (in thousands):
			For the Year Ended December 31,
			2013				2012				2011
	U.S. income		$	(80,533	)		$	(9,837	)		$	(258,673	)
	Foreign income		33,637				31,725				27,879
	Income before taxes		$	(46,896	)		$	21,888			$	(230,794	)
	Income taxes consist of the following (in thousands):
			For the Year Ended December 31,
			2013				2012				2011
	Current:
	Federal		$	5,961			$	9,631			$	6,588
	State		1,070				580				(117		)
	Foreign		10,229				9,575				7,196
			17,260				19,786				13,667
	Deferred
	Federal		(5,959		)		940				(42,232		)
	State		—				85				(5,720		)
	Foreign		(3,532		)		(2,852		)		(2,860		)
			(9,491		)		(1,827		)		(50,812		)
			$	7,769			$	17,959			$	(37,145	)
	Income taxes are reconciled to the amount computed by applying the statutory federal income tax rate of 35% to income before income taxes as follows (in thousands):
		For The Year Ended December 31,
		2013				2012				2011
	Federal income taxes at statutory rate	$	(16,414	)		$	7,661			$	(80,778	)
	State income taxes, net of Federal tax benefit	(277		)		883				(6,123		)
	Meals & entertainment	563				633				604
	UK research and development	(3,073		)		(4,161		)		(4,925		)
	US research and development	(1,200		)		—				(1,376		)
	Zion trust income	1,799				16,640				15,125
	Foreign tax rate differential	(3,536		)		(3,331		)		(1,832		)
	Trust rate differential	(780		)		(8,314		)		(8,103		)
	Disallowed and excess compensation	4,434				447				—
	Goodwill impairment	—				—				22,890
	Change in valuation allowance	85,135				(595		)		35,149
	Effect of §338(g) election	(68,751		)		—				—
	US tax on foreign dividend, net of foreign tax credit	—				1,600				—
	US deferred tax on undistributed foreign earnings	5,840				—				—
	Tax exempt interest income	(386		)		(618		)		—
	Disallowed transaction costs	2,834				—				—
	Stock compensation deferred adjustment	1,159				9,967				—
	Return to provision true-ups with full valuation allowance	—				(2,277		)		(3,373		)
	Change in contingency reserve	—				(375		)		(3,271		)
	Other	422				(201		)		(1,132		)
	Income tax expense(benefit)	$	7,769			$	17,959			$	(37,145	)
	The significant components of our deferred tax assets and liabilities consist of the following (in thousands):
		December 31, 2013				December 31, 2012
	Deferred tax assets - current
	Accrued compensation	$	14,294			$	6,404
	Accrued expenses	2,254				5,036
	Allowance for bad debt	1,807				664
	Net operating loss carryforwards	1,128				—
	Zion ARO liability	36,083				50,998
	Zion deferred revenue	33,288				46,970
	Zion cost capitalization	—				7,105
	Other	15				954
	Deferred tax assets - current	88,869				118,131
	Valuation allowance	(25,164		)		(8,643		)
	Deferred tax assets current, net of valuation allowance	63,705				109,488
	Deferred Tax Liabilities - current
	Prepaid expenses	(972		)		(2,209		)
	Zion trust unrealized gain/loss	(698		)		(1,188		)
	Investment in Zion trust	(41,293		)		(55,044		)
Zion deferred costs	(33,101		)		(46,783		)
Deferred revenue	(9,558		)		(4,426		)
Deferred tax on undistributed foreign earnings	(6,058		)		—
Other	(1,260		)		(939		)
Net deferred tax liabilities current	$	(29,235	)		$	(1,101	)
Deferred tax assets—noncurrent:
Plant, equipment and intangible assets (including tax-deductible goodwill) principally due to differences in depreciation and amortization	$	48,569			$	9,660
Asset retirement obligations other than Zion ARO	25,179				17,141
Accrued rate and contract reserves	275				997
Deferred rent	3,506				—
Stock compensation	723				2,694
AMT credit carryover	1,839				1,388
Foreign tax credit carryforward	14,353				14,582
Net operating loss carryforwards	22,844				23,854
General business credit carryforward	10,387				7,274
Capital loss carryforward	7,934				—
Zion ARO liability	114,113				152,361
Zion deferred revenue	100,316				133,635
Zion cost capitalization	—				16,578
Investment in joint ventures	13,130				—
Deferred revenue	8,941				439
Other	957				2,802
Deferred tax assets—non current	373,066				383,405
Valuation allowance	(118,924		)		(40,297		)
Deferred tax assets—noncurrent, net of valuation allowance	254,142				343,108
Deferred tax liabilities—noncurrent:
Plant, equipment and intangible assets principally due to differences in depreciation and amortization	(1,998		)		(47,030		)
Accrued rate and contract reserves	(2,435		)		(2,015		)
Reclamation	(8,255		)		(9,595		)
Investment in NDT fund	(121,228		)		(160,968		)
Unrealized gains in NDT Fund investments	(2,051		)		(7,478		)
Zion deferred costs	(99,249		)		(132,381		)
Other	(1,716		)		(4,148		)
Net deferred tax assets (liabilities) noncurrent	$	17,210			$	(20,507	)
Total deferred tax assets	$	317,847			$	452,596
Total deferred tax liabilities	$	(329,872	)		$	(474,204	)
With respect to the acquisition of EnergySolutions, Inc. by Rockwell during the second quarter of 2013, the Company made an election under Section 338(g) of the Internal Revenue Code to have the acquisition transaction treated as an asset acquisition (i.e., a taxable transaction). This election resulted in a step-up of the tax basis of certain assets of EnergySolutions, Inc. This increase in tax basis compared to book basis had the effect of significantly increasing the related deferred tax assets. As the U.S. has a full valuation allowance against its deferred tax assets, an additional result was a correlating increase in the valuation allowance compared to the prior year.
For the years ended December 31, 2013 and 2012, we had net operating loss carryforwards of $119.8 million and $113.3 million, respectively, in the U.S., $57.1 million and $53.3 million, respectively, in the U.K., and $4.3 million and $3.4 million, respectively, in Canada. Net operating loss carryforwards related to operations in the U.S. and Canada expire at various dates from 2021 through 2031. The net operating loss carryforwards in the U.K. do not expire. As of December 31, 2013, we also have general business credit carryforwards in the U.S. of $10.4 million that, if unused, will expire at various dates from 2027 through 2033, foreign tax credit carryforwards of $14.4 million that, if unused or converted to net operating losses, will expire in 2022, AMT credit carryforwards of $1.8 million that do not expire, and capital loss carryforwards of $7.9 million that, if unused, will expire in 2018.
Further, as a result of the acquisition, all U.S. federal net operating loss carryforwards became subject to an annual utilization limitation imposed by U.S. income tax law governing changes in ownership or control. It is expected that this limitation combined with the carryforward period will allow the utilization of all U.S. federal net operating loss carryforward amounts.
In assessing the realizability of deferred tax assets, we considered whether it was more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of the deferred tax assets is dependent upon the generation of future taxable income during periods in which temporary differences become deductible. We considered income taxes paid during the previous two years, projected future taxable income by jurisdiction, the types of temporary differences, and the timing of the reversal of such differences in making this assessment. Based on the level of historical taxable income and projections for future taxable income over the periods in which the temporary differences are deductible, we have determined a valuation allowance is necessary for both the U.S. and U.K. totaling $144.1 million and $48.9 million at December 31, 2013 and 2012, respectively. The net change in the valuation allowance for the years ended December 31, 2013, 2012 and 2011 was an increase of $95.1 million, $0 million, and $34.2 million, respectively. The increase in the valuation allowance for the year ended December 31, 2013 resulted primarily from the increase in tax basis driven by the §338(g) election.
During 2012, the Company determined that it had a need to repatriate cash from certain foreign jurisdictions. Consequently, the Company changed its prior assertion regarding permanent reinvestment of foreign earnings for the related foreign entities. There was a dividend paid from U.K. operations to the U.S. of approximately $31.6 million and the Company began recording deferred taxes related to all future foreign income or loss for these entities. Federal income taxes in the U.S. have not been provided on approximately $98.0 million of undistributed earnings of non-U.S. operations, which are considered to be permanently reinvested. As of December 31, 2013, a deferred federal income tax liability in the U.S. has been recorded for approximately $6.1 million of undistributed earnings of non-U.S. operations.
As of December 31, 2013 and 2012, we had $0.1 million and $0.1 million, respectively, of gross unrecognized tax benefits, which will not impact our annual effective tax rate in future years. These tax benefits were accounted for under authoritative guidance for accounting for uncertainty in income taxes. There were no changes to the total amounts of gross unrecognized tax benefits during 2013.
We recognized income tax expense of $7.8 million and $18.0 million for the years ended December 31, 2013 and 2012, respectively, and an income tax benefit of $37.1 million for the year ended 2011, for year-to-date effective tax rates of negative 16.6%, 81.8%, and 15.9% , respectively, based on an estimated annual effective tax rate method. Income tax expense arises from income for certain entities in the U.K. and for the Zion NDT fund. No benefits from losses in the U.S. and other entities in the U.K. are available to offset tax expense due to their respective full valuation allowance positions.
The 2013 effective tax rate differs from the statutory rate of 35%, primarily as a result of the small amount of tax expense on U.K. and Zion NDT fund income relative to consolidated pretax book losses which include large losses in the U.S. and the U.K. for which no benefit is recorded due to their full valuation allowance positions. The year-to-date effective tax rate was also impacted by lower statutory tax rates for foreign jurisdictions and the NDT fund, the tax benefit of foreign research and development credits, a step up in tax basis due to a 338(g) election made upon the Merger Transaction and a benefit recorded for the effect of a statutory rate reduction in the U.K. enacted during the third quarter of 2013.
The 2012 effective tax rate differs from the statutory rate of 35% primarily as a result of the amount of income tax expense relative to the amount of pretax book income, lower tax on income in foreign jurisdictions and the NDT fund, the tax benefit of foreign research and development credits, income tax expense due to the change in management’s assertion with respect to unremitted foreign earnings, offset by foreign tax credits and further offset by the release of a domestic valuation allowance on net operating losses resulting from an increase in taxable income due to the partial change in the reinvestment assertion, and the reversal of certain unrecognized tax benefits.
The 2011 effective tax rate differs from the statutory rate of 35% primarily as a result of having pretax book losses, lower income tax rates in foreign jurisdictions and a lower statutory rate at the NDT trust level, the recognition of uncertain tax positions in the U.S., and the use of certain research and development tax credits in both the U.S. and the U.K. These benefits were offset by additional tax expense resulting from NDT fund earnings being taxed at both the trust and corporate levels, the addback of a portion of the goodwill impairment that is not deductible for tax purposes and a valuation allowance recorded against certain domestic and foreign deferred tax assets.
For the years ended December 31, 2013, 2012 and 2011, we made income tax payments, net of income tax refunds, of $10.3 million, $18.9 million, and $26.8 million, respectively. These tax payments were made in the U.K., Canada and at the Zion NDT fund whereas the U.S. had losses and net operating loss carryforwards.
The Company and its U.S. subsidiaries are subject to U.S. federal and state income taxes, and, therefore, examinations by those taxing authorities. We recognize interest and penalties related to unrecognized tax benefits as a component of the provision for income taxes. The tax years 2010 through 2012 for U.S. Federal and state returns, 2012 for U.K. returns, and 2010 through 2012 for Canadian returns remain open to examination by the major taxing jurisdictions in which we operate. No material changes to unrecognized tax positions are anticipated during the next year. The Company has not been notified of income tax audits by any taxing authority, and the timing of future tax examinations is highly uncertain; however, we do not anticipate any significant impacts to the unrecognized tax benefits within the next 12 months.

Segment_Reporting_and_Business

Segment Reporting and Business Concentrations	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Reporting and Business Concentrations	'
	Segment Reporting and Business Concentrations
	During the fourth quarter of 2013, we streamlined our business groups to enable us to evaluate and oversee strategic initiatives more efficiently and to improve future growth and profitability. We report our results through four major operating segments: Projects, Products, LP&D and International. The chief operating decision maker now reviews the operating results of the four new segments.
	Certain reclassifications have been made to the segment information reported for prior years, to conform to current year presentation.
		As of and for the Year Ended December 31, 2013
		Projects			Products			LP&D			International			Corporate			Consolidated
														Unallocated Items
	Revenue from external customers(1)(2)	$	295,816		$	84,242		$	236,854		$	1,187,486		$	—		$	1,804,398
	Income (loss) from operations(2)(3)	21,415			11,863			65,805			30,765			(98,404		)	31,444
	Depreciation, amortization and accretion expense(4)	26,616			2,061			28,829			7,625			3,740			68,871
	Goodwill	40,236			17,951			207,990			43,331			—			309,508
	Other long-lived assets(5)	15,193			15,706			248,274			42,195			7,469			328,837
	Purchases of property, plant and equipment	80			237			13,719			201			962			15,199
	Total assets(6)	1,143,673			52,642			612,423			522,533			89,272			2,420,543
		As of and for the Year Ended December 31, 2012
		Projects			Products			LP&D			International			Corporate			Consolidated
														Unallocated Items
	Revenue from external customers(1)(2)	$	309,188		$	125,816		$	233,075		$	1,139,426		$	—		$	1,807,505
	Income (loss) from operations(2)(3)(7)	20,408			14,856			48,660			30,283			(74,300		)	39,907
	Depreciation, amortization and accretion expense(4)	30,869			1,911			34,382			7,568			4,881			79,611
	Goodwill	40,236			17,951			207,216			43,205			—			308,608
	Other long-lived assets(5)	17,598			18,840			262,826			49,275			10,269			358,808
	Purchases of property, plant and equipment	1,756			2,075			15,314			388			812			20,345
	Total assets(6)	1,434,407			63,210			641,826			378,111			137,908			2,655,462
		As of and for the Year Ended December 31, 2011
		Projects			Products			LP&D			International			Corporate			Consolidated
														Unallocated Items
	Revenue from external customers(1)(2)	$	411,828		$	49,990		$	252,659		$	1,101,037		$	—		$	1,815,514
	Income (loss) from operations(2)(3)(7)(8)	(106,366		)	3,181			(77,789		)	26,015			(60,636		)	(215,595		)
	Depreciation, amortization and accretion expense(4)	34,855			2,180			31,382			7,644			4,633			80,694
	Goodwill	40,236			17,951			208,250			39,921			—			306,358
	Other long-lived assets(5)	26,063			18,904			269,017			53,937			19,567			387,488
	Purchases of property, plant and equipment	1,200			3,840			14,470			635			3,589			23,734
	Total assets(6)	1,660,477			51,506			689,645			511,872			102,433			3,015,933
	______________________
	-1	We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.
	-2	Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and for services provided to our customers in Canada are included in our LP&D and Projects Groups.
	-3	For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.
	-4	Depreciation, amortization and accretion expenses ("DA&A") are included in cost of revenue and SG&A expenses in the accompanying consolidated statements of operations and comprehensive income (loss). DA&A expenses included in cost of revenue for the years ended December 31, 2013, 2012 and 2011, were $47.9 million, $56.3 million and $58.3 million, respectively. DA&A expenses included in SG&A for years ended December 31, 2013, 2012 and 2011, were $20.9 million, $23.3 million and $22.4 million, respectively.
	-5	Other long-lived assets include property, plant and equipment and other intangible assets.
	-6	Corporate unallocated assets relate primarily to income tax receivables, deferred tax assets, deferred financing costs, prepaid expenses, and property, plant and equipment that benefit the entire Company and cash.
	-7	Included in income (loss) from operations from our Projects group for the years ended December 31, 2012 and 2011, is an $8.7 million non-cash favorable ARO adjustment and a $94.9 million non cash unfavorable ARO estimated cost adjustment, respectively, related to the Zion Station project, for which no corresponding revenue was recognized.
	-8	For the year ended December 31, 2011, included in income (loss) from operations from our Projects and LP&D groups, is a goodwill impairment charge of $35.0 million and $139.0 million, respectively.
	Our revenue and long-lived assets by geographic region were as follows (in thousands):
	As of and for the Year Ended December 31,		United			United			Other			Total
			States			Kingdom
	2013
	Revenue from external customers		$	548,188		$	1,187,486		$	68,724		$	1,804,398
	Property, plant and equipment, net		112,418			624			1,434			114,476
	2012
	Revenue from external customers		$	564,385		$	1,139,426		$	103,694		$	1,807,505
	Property, plant and equipment, net		114,770			1,108			1,866			117,744
	2011
	Revenue from external customers		$	690,172		$	1,101,037		$	24,305		$	1,815,514
	Property, plant and equipment, net		125,155			807			647			126,609

Customer_Concentrations

Customer Concentrations	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
Customer Concentrations	'
	Customer Concentrations
	Our International segment derives its revenue primarily through contracts with the NDA. For the years ended December 31, 2013, 2012 and 2011, respectively 64.9%, 63.8% and 61.0%, respectively, of our total consolidated revenue was generated from contracts funded by the NDA. Accounts receivable relating to the NDA at December 31, 2013, and 2012, were $215.8 million and $186.0 million, respectively.
	We have contracts with various offices within the DOE, including the Office of Environmental Management, the Office of Civilian Radioactive Waste Management, the National Nuclear Security Administration and the Office of Nuclear Energy. Revenue from DOE contractors and subcontractors represented approximately 12.1%, 11.0% and 15.3% of our total consolidated revenue for the years ended December 31, 2013, 2012 and 2011, respectively. Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts relating to DOE contractors and subcontractors at December 31, 2013 were $20.4 million and $33.5 million, respectively. Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts relating to DOE contractors and subcontractors at December 31, 2012 were $19.4 million and $33.5 million, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	(a)	Leases and Other Contractual Obligations
	We have several noncancellable leases that cover real property and machinery and equipment. Such leases expire at various dates with, in some cases, options to extend their terms. Several of the leases contain provisions for rent escalation based primarily on increases in real estate taxes and operating costs incurred by the lessor. Rent expense on noncancellable leases was $24.0 million, $21.0 million, and $18.5 million for the years ended December 31, 2013, 2012 and 2011, respectively. We recorded sublease income related to our vacant facilities $0.2 million, $0.2 million and $0 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	We are obligated under capital leases covering certain machinery and equipment, computer equipment and vehicles that expire at various dates during the next five years. As of December 31, 2013 and 2012, we had capital leases obligations of $3.1 million and $2.6 million, respectively. The current portion of the capital lease obligations is included in accrued expenses and other current liabilities and the long-term portion is included in other noncurrent liabilities in our consolidated balance sheets.
	The following table summarizes future minimum annual lease payments for all operating and capital leases and annual payments for other contractual obligations with initial or remaining lease terms greater than one year (in thousands):
	Year ending December 31,		Operating		Sublease Rental Income			Capital			Other
			Leases					Leases			Contractual
											Obligations
	2014		$	13,449	$	(1,271	)	$	1,040		$	2,500
	2015		8,391		(2,003		)	1,006			2,500
	2016		5,692		(1,388		)	918			—
	2017		4,090		(1,035		)	413			—
	2018		3,215		(822		)	159			—
	Thereafter		9,400		(3,610		)	—			—
	Future minimum lease payments		$	44,237	$	(10,129	)	3,536			$	5,000
	Less portion representing interest							(389		)
	Less current portion of capital lease obligations							(861		)
	Long-term portion of capital lease obligations							$	2,286
	(b)	Letters of Credit/Surety Bonds
	We are required to post, from time to time, standby letters of credit and surety bonds to support contractual obligations to customers, self-insurance programs, closure and post-closure financial assurance and other obligations. As of December 31, 2013 and 2012, we had $286.5 million and $307.1 million in deposit letters of credit issued under our senior secured credit facility and $58.9 million and $73.0 million of letters of credit issued against our senior secured revolving credit facility.
	As of December 31, 2013 and 2012, we had $60.5 million and $27.5 million, respectively, in surety bonds outstanding. With respect to the surety bonds, we have entered into certain indemnification agreements with the providers of the surety bonds, which would require funding by us only if we fail to perform under the contracts being insured and the surety bond issuer was obligated to make payment to the insured parties.
	Our processing and disposal facilities operate under licenses and permits that require financial assurance for closure and post-closure costs. We provide for these requirements through a combination of restricted cash, cash deposits, letters of credit, surety bonds and insurance policies. As of December 31, 2013 and 2012, the closure and post-closure state regulatory requirements for our facilities were $142.5 million and $151.5 million, respectively.
	(c)	Legal Proceedings
	Pennington et al. v. ZionSolutions, LLC, et al.
	On July 14, 2011, four individuals, each of whom are electric utility customers of Commonwealth Edison Company, the former owner of the Zion Station (“Com Ed”), filed a complaint in the U.S. District Court for the Northern District of Illinois, Eastern Division, against ZionSolutions and Bank of New York Mellon, the trustee of the Zion Station decommissioning trust (“NDT”) fund.
	The plaintiffs claim that payments from the NDT fund to ZionSolutions for decommissioning the Zion Station are in violation of Illinois state law, Illinois state law entitles the utility customers of Com Ed to payments (or credits) of a portion of the NDT fund and that Bank of New York Mellon was inappropriately appointed by ZionSolutions as trustee of the NDT fund. The plaintiffs seek to enjoin and recover payments from the NDT fund to ZionSolutions, that payments (or credits) of a portion of the NDT fund be made to utility customers of Com Ed, the appointment of a new trustee over the NDT fund, an accounting from Bank of New York Mellon of all assets and expenditures from the NDT fund and costs and attorneys fees. The plaintiffs also seek class action certification for their claims. On September 13, 2011, the defendants filed a motion to dismiss the plaintiffs’ claims. On July 29, 2013, the U.S. District Court for the Northern District of Illinois, Eastern Division dismissed the entire lawsuit. The plaintiffs appealed to the United States Court of Appeals for the Seventh Circuit. The Seventh Circuit affirmed the dismissal on January 31, 2014 and denied the plaintiffs’ motion for rehearing en banc on February 28, 2014.
	Litigation Relating to the Merger with Energy Capital Partners
	Following the Company’s January 7, 2013 announcement that it had entered into a Merger Agreement providing for the acquisition of the Company, by Parent, an entity formed by Energy Capital Partners, ten purported class action lawsuits were brought against us, the members of our board of directors, Energy Capital Partners II, LLC, Parent and Merger Sub. Six lawsuits were filed in the Delaware Court of Chancery, captioned Printz v. Rogel, et al., C.A. No. 8302-VCG (Jan. 10, 2013); Bushansky v. EnergySolutions, Inc., et al., C.A. No. 8210 (Jan. 11, 2013); Danahare v. EnergySolutions, Inc., et al., C.A. No. 8219 (Jan. 15, 2013); Graham v. EnergySolutions, Inc., et al. (Jan. 15, 2013), and Lebron v. EnergySolutions, Inc., et al., C.A. No. 8223 (Jan. 15, 2013); Louisiana Municipal Police Employees’ Retirement System v. EnergySolutions, Inc., et al., C.A. No. 8350 (Feb. 22, 2013), (the “Delaware actions”).
	The other four lawsuits were filed in the Utah State District Court, Third Judicial District, Salt Lake County, and are titled Mohammed v. EnergySolutions, Inc., et al., No. 130400388 (Jan. 10, 2013); Luck v. EnergySolutions, Inc., et al. No. 130900256 (Jan. 11, 2013); Braiker v. EnergySolutions, Inc., et al., No. 130900573 (Jan. 25, 2013); and Temmler v. EnergySolutions, Inc., et al., No. 130900684 (Jan 31, 2013), (the “Utah actions”).
	Without admitting any wrongdoing and to avoid the burden, expense and disruption of continued litigation, EnergySolutions, Inc., the members of our board of directors, Energy Capital Partners II, LLC, Parent and Merger Sub entered into a settlement agreement with the plaintiffs. The Delaware and Utah courts approved the settlement agreement and dismissed the Delaware actions and Utah actions, respectively.
	EnergySolutions, Inc. vs. Kurion, Inc. et al.
	On March 6, 2013, the Company filed a lawsuit against Kurion Inc. and John Raymont, Jr. and Mark Denton, two former EnergySolutions employees now employed by Kurion to enforce contractual and intellectual property rights related to EnergySolutions’ waste treatment and vitrification technologies. The lawsuit was initially filed in the Third Judicial District Court in and for Salt Lake City, Utah.  The Utah action was dismissed on personal jurisdiction grounds.  EnergySolutions filed lawsuits to enforce the same contractual and intellectual property rights related to EnergySolutions’ waste treatment and vitrification technologies in the Supreme Court of the State of New York, County of New York, on November 22, 2013 and in the State of South Carolina Court of Common Pleas County of Richland on November 22, 2013. The Company seeks monetary and punitive damages, and asks the court to enjoin further sales of all Kurion products and services that utilize or derive from the confidential and proprietary technology misappropriated from EnergySolutions. Kurion filed a claim against EnergySolutions in the Superior Court of the State of California County of Orange Central Justice Center on October 21, 2013, alleging breach of contract and asking the court for costs, reasonable attorneys’ fees and unspecified damages. The lawsuits remain in initial procedural motions regarding the jurisdiction of the various courts over the subject matter and parties.
	We believe the legal claims alleged against the Company in the complaints described above are without merit and we intend to vigorously defend these actions to the extent not yet resolved.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	(18) Employee Benefit Plans
	We sponsor a defined contribution 401(k) plan that covers nearly all of our full time U.S. based employees. The plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended. Under this plan, upon the first day of the next month following commencement of employment, employees become immediately eligible to participate in the plan and to receive matching company contributions. We match 50% of the first 6% of a participant's deferred contribution. In addition, we may at our discretion contribute an additional 1% of a participant's deferred contribution. Employee contributions are fully vested immediately. Our matching contributions vest ratably over 4 years. We contributed $3.7 million, $3.6 million and $3.5 million, for the years ended December 31, 2013, 2012 and 2011, respectively.
	The Electricity Supply Pension Scheme ("ESPS")
	We provide a defined benefit pension plan for approximately 60 ESEU employees in the U.K. (the "ESEU Plan"). The ESEU Plan is funded by contributions from ESEU employees and EnergySolutions. All other U.K. employees are offered the opportunity to join a defined contribution pension scheme into which the Company pays a maximum of 12% of salary.
	In addition, under the terms of our contract with the NDA, EnergySolutions, through its subsidiary ESEU, manages the Magnox Limited pension plan (the "Magnox Plan"), which provides pension benefits to a majority of the 3,300 employees under management in the U.K. The Magnox Plan is funded by contributions from Magnox employees and the NDA. The plan is a separate section of an overall industry scheme, the Electricity Supply Pension Scheme ("ESPS").
	As part of the reorganization of the U.K. nuclear industry by the U.K. government, the NDA assumed responsibility to fund all employer pension contributions, including any deficit or a benefit in the case of any surplus, to the Magnox Plan. In addition to the employer contributions, the NDA agreed to make annual repair contributions in the amount of £20.0 million, from 2012 through 2014, for each of the years with an underfunded status position. In order to reflect these arrangements, our financial statements include an amount recoverable from the NDA, included within other noncurrent assets in an amount equal to the recorded Magnox section liability, net of tax, with a corresponding credit to revenue since the charges are allowable costs under our cost-plus contract with the NDA, offsetting a portion of the after-tax pension charges. As such, we recognized revenue of approximately $43.1 million, $77.3 million and $77.8 million, for the years ended December 31, 2013, 2012 and 2011, respectively. For the years ended December 31, 2013, and 2012, we had a $103.6 million receivable from the NDA due to an underfunded status, and a payable to the NDA of $39.5 million, due to an overfunded status, respectively. The corresponding liability is included in pension liabilities in the accompanying consolidated balance sheets.
	The following table sets forth the change in projected benefit obligation, plan assets and funded status pension plans' obligations (in thousands):
			Year Ending December 31,
			2013				2012
	Changes in projected benefit obligation:
	Projected benefit obligation at beginning of period		$	3,836,343			$	3,447,461
	Service cost		57,272				56,271
	Interest cost		156,011				159,303
	Member contributions		469				476
	Termination benefits		9,858				23,142
	Benefits paid		(160,392		)		(169,447		)
	Actuarial gain		220,480				155,815
	Foreign currency translation		91,925				163,322
	Projected benefit obligation at end of year		4,211,966				3,836,343
	Changes in plan assets:
	Fair value at beginning of period		3,875,793				3,580,382
	Actual return on plan assets		250,994				193,382
	Company contributions		47,257				85,595
	Employee contributions		469				476
	Termination benefits		8,919				17,912
	Benefits paid		(160,392		)		(169,447		)
	Foreign currency translation		85,343				167,493
	Plan assets at end of year at fair value		4,108,383				3,875,793
	Funded status at end of year		$	(103,583	)		$	39,450
	Amounts recognized in the consolidated balance sheets:
	Pension assets included in other noncurrent assets		103,563				39,773
	Pension liabilities included in other noncurrent liabilities		(111,644		)		(31,043		)
	Accumulated other comprehensive loss (pretax)		(9,712		)		(4,880		)
	The termination benefits relate to early retirement benefits provided to employees who have left service involuntarily before normal retirement age and have been granted an unreduced early retirement pension. These are contractual termination benefits required under the plans' rules.
	We expect $52.7 million to be contributed to our defined benefit pension plans in 2014. Estimated benefit plan payments for the five years following 2013 and the subsequent five years aggregated, excluding amounts recoverable from the NDA, are as follows (in thousands):
			2014				2015			2016			2017		2018		Thereafter
	Estimated benefit plan payments		$	174,145			$	179,422		$	184,699		$	190,471	$	196,243	$	1,073,564
	Net periodic benefit costs related to the Magnox pension plan consisted of the following (in thousands):
			Year Ending December 31,
			2013				2012			2011
	Service cost		$	57,272			$	56,271		$	56,635
	Interest cost		156,011				159,303			173,275
	Expected return on plan assets		(182,456		)		(171,983		)	(182,420		)
	Net actuarial loss		1,408				951			—
	Termination benefits		8,763				22,667			8,182
	Total net periodic benefit costs		$	40,998			$	67,209		$	55,672
	Actuarial losses expected to be recognized as a component of net periodic pension costs in 2014 are not material.
	Weighted average assumptions used to determine benefit obligations were as follows:
			31-Dec-13			31-Dec-12
	Discount rate		4.4	%		4.3	%
	Expected rates of return on plan assets		5.2% - 5.3%			4.9% - 5.8%
	Rate of compensation increase		3.6	%		3.1	%
	The overall expected long-term rate of return is based on our view of the expected long-term rates of return of each major asset category taking into account the proportions of assets held in each category at the relevant reporting date. The expected rate of return for equities was determined by adding a long-term equity risk premium to a risk-free rate. The equity risk premium reflects our view of expected long-term returns on equities in excess of the risk-free rate, taking into account historic returns and current market conditions. The expected return on debt securities is based upon an analysis of current yields on portfolios of similar quality and duration.
	The following table sets forth the target allocations and the weighted average actual allocations of plan assets:
			31-Dec-13			31-Dec-12
	Asset category:
	Equities		16.6	%		14.7	%
	Bonds		47.5	%		55.7	%
	Real Estate		5.1	%		5	%
	Other		30.8	%		24.6	%
			100	%		100	%
	Our investment policy is set by the trustees of the pension plans, after consultation with the Company. The investment policy and appointed investment managers are reviewed regularly by a subset of the trustees who form an investment committee, reporting to the full trustee body. Independent investment advice is obtained by the investment committee. The investment policy considers the timing and nature of future cash flows, as well as the risk characteristics of both the liabilities and the assets held. The investment objective is to maximize returns subject to there being sufficient assets and cash flow available to pay members' benefits as and when they are due.
	The trustees have a policy of cash management to ensure that sufficient liquid funds are available when divestments are required to meet benefit payment obligations as they become payable.
The following table sets forth by level within the fair value hierarchy a summary of the pension plans' investments (in thousands):
		December 31, 2013
		Total				Level 1			Level 2			Level 3
Cash		$	73,764			$	73,764		$	—		$	—
Fixed income securities		2,595,585				—			2,369,658			225,927
Equity securities		1,285,341				1,148,136			137,205			—
Real Estate		153,693				—			—			153,693
Investments, at fair value		$	4,108,383			$	1,221,900		$	2,506,863		$	379,620
		December 31, 2012
		Total				Level 1			Level 2			Level 3
Cash		$	5,384			$	5,384		$	—		$	—
Fixed income securities		2,267,773				837,131			1,425,468			5,174
Equity securities		1,108,931				1,108,931			—			—
Real Estate		493,705				—			145,996			347,709
Investments, at fair value		$	3,875,793			$	1,951,446		$	1,571,464		$	352,883
The following table presents the rollforward for Level 3 pension plans' assets at a fair value on a recurring basis (in thousands):
Direct Lending Securities	December 31,
	2013
Beginning balance	$	352,883
Purchases and issuances	26,132
Sales, dispositions and settlements	—
Realized gains and losses	(1,252		)
Change in unrealized gains and losses	1,857
Ending balance	$	379,620

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring	'
	Restructuring
	In 2012, we initiated a restructuring plan (the "Restructuring Plan") to reduce operating costs and improve profitability within our operations in the U.S. Under the Restructuring Plan, we reduced our facility footprint and implemented a reduction of force across multiple business segments and functions.
	For the years ended December 31, 2013 and 2012, we recognized $5.5 million and $1.5 million, respectively, in restructuring charges associated with lease contract terminations. Of the charges recognized during 2013, $1.8 million is included in cost of revenue related to our LP&D group, and $3.7 million is included in corporate SG&A expenses within the consolidated statements of operations and comprehensive income (loss). At December 31, 2013 and December 31, 2012, we had accrued liability balances of $9.5 million and $1.3 million, respectively, of which $7.3 million and $1.3 million, respectively, were included in other long term liabilities in the accompanying consolidated balance sheets. In determining facilities lease loss liability, various assumptions were made, including the time period over which the buildings will be vacant, expected sublease terms and expected sublease rates. Adjustments to this accrual may be required in future periods if events and circumstances change.
	For the years ended December 31, 2013 and 2012, we recognized $1.1 million and $8.7 million, respectively, in restructuring charges related to severance and employee termination benefits, which are included in the consolidated statements of operations and comprehensive income (loss) under SG&A. The corresponding employee termination liabilities as of December 31, 2013 and December 31, 2012 were $1.1 million and $4.4 million, respectively, and are included in accrued expenses and other current liabilities in the consolidated balance sheets. In February 2013, we announced that we had substantially completed the Restructuring Plan. The remaining unpaid termination benefits are expected to be paid within the next six months.
	For the year ended December 31, 2012, we also recognized approximately $5.2 million in restructuring charges related to professional, legal and consulting fees, which are included in the consolidated statements of operations and comprehensive income (loss) under corporate SG&A. No liability for these charges was outstanding as of December 31, 2012. No charges of this nature were recognized during 2013.
	In 2009, we started an initial organizational review of our Magnox sites and identified an opportunity to reduce the existing workforce, primarily at three sites at which decommissioning was relatively close to completion with only a few projects remaining. The termination plan was presented in two phases and was approved by the NDA. As a result of overstaffing at the Magnox sites, approximately 300 employees left us on a voluntary basis. For the year ended December 31, 2013, we recognized an additional $55.6 million of expected employee termination benefits related to the termination of approximately 200 employees at the Bradwell site, which is rapidly moving into the early care and maintenance phase. Additionally, we also accrued employee termination benefits for the Chapelcross site, which is decreasing in size following completion of defueling activities and is preparing for further decommissioning, as well as the Dungeness, Oldbury, Trawsfynydd sites, which are getting ready to re-shape the workforce following cessation of power generation in 2014. No termination benefits were recognized for year ended December 31, 2012. These benefits are included in cost of revenue in the accompanying consolidated statements of operations and comprehensive income (loss) related to our International operations. The corresponding liability as of December 31, 2013 and December 31, 2012 was $46.7 million and $5.7 million, respectively, and is included in accrued expenses and other current liabilities and other long term liabilities in the consolidated balance sheets. The remaining liability is expected to be paid over approximately the next 24 months.
	The following is a reconciliation of the beginning and ending liability balances related to the Magnox employee termination benefits (in thousands):
		December 31,			December 31,
		2013			2012
	Beginning liability	$	5,695		$	32,659
	Additions	55,555			—
	Payments	(17,195		)	(27,888		)
	Effect of exchange rate	2,673			924
	Ending liability	46,728			5,695
	Less current portion	(23,055		)	—
	Long term portion	$	23,673		$	5,695
	The termination plan and employee benefits paid for the termination of these employees are in accordance with the existing employee and the trade union agreements and were pre-approved by the NDA. All employee termination benefits are treated as part of the normal Magnox cost base and are reimbursed by the NDA.
	Magnox Limited continues to transition as sites move to a new state within their lifecycle. The Magnox Optimized Decommissioning Program ("MODP") includes approximately ten further changes of organization across the ten Magnox sites in the next 5 years. As a result of these changes and the drive to reduce support and overhead costs, there will be significant manpower reductions, expected to be approximately 600 employees, during the next two years, followed by a further reduction of approximately 1,000 employees in the period from 2016 to 2020. The MODP has been approved by the NDA and forms part of the NDA funding settlement which in turn is part of the U.K. government's current Comprehensive Spending Review ("CSR").
	The current total termination benefit costs included within the MODP over the remainder of the CSR period to 2015 is estimated to be approximately $96.0 million, and is expected to be paid over the next six years. These amounts are estimates and have not yet been recorded because accounting criteria have not yet been met.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
	The following table presents the changes in the accumulated balances for each component of other comprehensive income (loss):
	(in thousands)	Foreign			Change in			Accumulated
		currency			unrecognized			other
		translation			actuarial loss			comprehensive
		items						loss
	Beginning Balance at December 31, 2012	$	(17,076	)	$	(4,880	)	$	(21,956	)
	Current period other comprehensive income (loss)	3,911			(4,832		)	(921		)
	Ending balance at December 31, 2013	$	(13,165	)	$	(9,712	)	$	(22,877	)

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	In connection with the execution of his employment agreement as of the date of the Merger Transaction, our chief executive officer purchased 5,000 shares of Rockwell's common stock worth $5,000,000 on June 7, 2013.
	As required by his employment arrangement, on July 26, 2012, our chief executive officer purchase 884,614 shares of stock from the Company through his account in the Company's 401(k) plan at a price of $1.69 per share.
	Clare Spottiswoode, who was a member of the Company’s Board until the Merger Transaction, has served as Chair of EnergySolutions EU Limited, a wholly-owned subsidiary of the Company based in the United Kingdom, since January 2010. Pursuant to her Letter of Appointment, dated as of December 18, 2009, Ms. Spottiswoode was paid an annual fee of £150,000 for her service as Chair. This transaction was approved by the Company’s then existing Audit Committee.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Selected Quarterly Financial Data (Unaudited)	'
	Selected Quarterly Financial Data (Unaudited)
			2013 Quarters Ended
			March 31			June 30			September 30			December 31
			(in thousands, except for per share data)
	Statement of operations data:
	Revenue		$	526,208		$	411,038		$	392,474		$	474,678
	Gross profit(1)		46,430			47,397			36,485			67,128
	Income (loss) from operations(1)(2)		14,875			(22,098		)	10,239			28,428
	Net income (loss) attributable to EnergySolutions(1)(2)		(8,200		)	(57,230		)	(4,855		)	15,632
	Net income (loss) per share data (3)
	Basic		$	(0.09	)	N/A			N/A			N/A
	Diluted		(0.09		)	N/A			N/A			N/A
	Number of shares used in per share calculations:
	Basic		90,360			N/A			N/A			N/A
	Diluted		90,360			N/A			N/A			N/A
	_______________________________________________________________________________
	-1	The second quarter of 2013, includes $32.6 million of Merger Transaction related expenses comprised of employee incentive compensation and related payroll taxes and professional fees.
	-2	During 2013, we paid $8.0 million in lead arranger banker fees in connection with amendments made to our senior secured credit facility to obtain consent from our lender to complete the Merger Transaction.
	-3	The Company's common stock ceased to be traded on the New York Stock Exchange after close of market on May 24, 2013, and continues its operations as a privately-held company.
			2012 Quarters Ended
			March 31			June 30			September 30			December 31
			(in thousands, except for per share data)
	Statement of operations data:
	Revenue		$	490,692		$	392,621		$	444,157		$	480,035
	Gross profit(1)		31,680			35,903			46,157			56,986
	Income (loss) from operations(1)		(1,252		)	4,089			18,664			18,406
	Net income (loss) attributable to EnergySolutions(2)		(669		)	5,444			10,052			(10,845		)
	Net income (loss) per share data:
	Basic		$	(0.01	)	$	0.06		$	0.11		$	(0.12	)
	Diluted		(0.01		)	0.06			0.11			(0.12		)
	Number of shares used in per share calculations:
	Basic		89,066			89,249			89,994			90,253
	Diluted		89,066			89,249			89,994			90,256
	_______________________________________________________________________________
	-1	Includes charges for the following items: $5.6 million reversal of incentive fee related to our Salt Waste project recorded during the first quarter of 2012, $15.4 million in restructuring costs and $8.7 million favorable ARO cost estimate adjustment related to the Zion Station project, both recorded during the fourth quarter of 2012.
	-2	Includes $18.0 million in income tax expense resulting from an increase in the valuation allowance against certain U.S. and foreign deferred tax assets with no offsetting benefit for losses in the U.S. and certain other entities in the U.K. due to the valuation allowance positions.

Guarantor_and_NonGuarantor_Fin

Guarantor and Non-Guarantor Financial Information	12 Months Ended
	Dec. 31, 2013
Guarantor and Non-Guarantor Financial Information	'
Guarantor and Non-Guarantor Financial Information	'
	Guarantor and Non-Guarantor Financial Information
	The 2018 senior notes were issued by EnergySolutions, Inc., the parent company, and EnergySolutions, LLC (together with EnergySolutions, Inc., the "Issuers"). The senior notes are jointly and severally guaranteed on a full and unconditional basis by each of the EnergySolutions, Inc.’s current and future domestic 100% owned subsidiaries that are guarantors under the senior secured credit facility, other than ZionSolutions LLC, which was established for the purpose of the Company’s license stewardship initiative, as well as up to five other special purpose subsidiaries that may be established for similar license stewardship projects, and certain other non-operating or immaterial subsidiaries.
	Presented below is the consolidating financial information of the issuers, our subsidiaries that are guarantors (the "Guarantor Subsidiaries"), and our subsidiaries that are not guarantors (the "Non-Guarantor Subsidiaries"). The consolidating financial information reflects the investments of EnergySolutions, Inc. in the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries using the equity method of accounting.
	CONSOLIDATING STATEMENT OF OPERATIONS
	For The Year ended December 31, 2013
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Revenue	$	—			$	92,188			$	386,838			$	1,385,938			$	(60,566	)		$	1,804,398
	Cost of revenue	—				(34,534		)		(313,263		)		(1,319,727		)		60,566				(1,606,958		)
	Gross profit	—				57,654				73,575				66,211				—				197,440
	Selling, general and administrative expenses	—				(121,617		)		(27,405		)		(21,439		)		—				(170,461		)
	Equity in income of unconsolidated joint ventures	—				—				4,465				—				—				4,465
	Operating income (loss)	—				(63,963		)		50,635				44,772				—				31,444
	Interest expense	—				(61,640		)		(5		)		(15,129		)		—				(76,774		)
	Income (loss) from subsidiaries	(54,619		)		78,588				—				—				(23,969		)		—
	Other, net	—				(7,604		)		156				5,882				—				(1,566		)
	Income (loss) before income taxes	(54,619		)		(54,619		)		50,786				35,525				(23,969		)		(46,896		)
	Provision for income taxes	(34		)		—				—				(7,735		)		—				(7,769		)
	Net income (loss)	(54,653		)		(54,619		)		50,786				27,790				(23,969		)		(54,665		)
	Less: net income attributable to noncontrolling interests	—				—				—				12				—				12
	Net income (loss) attributable to EnergySolutions	$	(54,653	)		$	(54,619	)		$	50,786			$	27,802			$	(23,969	)		$	(54,653	)
	Other comprehensive income (loss):
	Net income (loss)	$	(54,653	)		$	(54,619	)		$	50,786			$	27,790			$	(23,969	)		$	(54,665	)
	Foreign currency translation adjustments, net of taxes	—				—				—				3,911				—				3,911
	Change in unrecognized actuarial loss	—				—				—				(4,832		)		—				(4,832		)
	Other comprehensive income (loss)	(54,653		)		(54,619		)		50,786				26,869				(23,969		)		(55,586		)
	Less: net income attributable to noncontrolling interests	—				—				—				12				—				12
	Comprehensive income (loss) attributable to EnergySolutions	$	(54,653	)		$	(54,619	)		$	50,786			$	26,881			$	(23,969	)		$	(55,574	)
	CONSOLIDATING STATEMENT OF OPERATIONS
	For The Year Ended December 31, 2012
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Revenue	$	—			$	75,143			$	453,709			$	1,331,675			$	(53,022	)		$	1,807,505
	Cost of revenue	—				(40,716		)		(384,463		)		(1,264,622		)		53,022				(1,636,779		)
	Gross profit	—				34,427				69,246				67,053				—				170,726
	Selling, general and administrative expenses	—				(84,430		)		(33,297		)		(20,484		)		—				(138,211		)
	Equity in income of unconsolidated joint ventures	—				—				7,392				—				—				7,392
	Operating income (loss)	—				(50,003		)		43,341				46,569				—				39,907
	Interest expense	—				(57,770		)		—				(13,441		)		—				(71,211		)
	Income (loss) from subsidiaries	3,993				116,526				—				—				(120,519		)		—
	Other, net	—				(4,760		)		(1,256		)		59,208				—				53,192
	Income (loss) before income taxes	3,993				3,993				42,085				92,336				(120,519		)		21,888
	Benefit from (provision for) income taxes	(11		)		—				—				(17,948		)		—				(17,959		)
	Net income (loss)	3,982				3,993				42,085				74,388				(120,519		)		3,929
	Less: net income attributable to noncontrolling interests	—				—				—				53				—				53
	Net income (loss) attributable to EnergySolutions	$	3,982			$	3,993			$	42,085			$	74,441			$	(120,519	)		$	3,982
	Other comprehensive income (loss):
	Net income (loss)	$	3,982			$	3,993			$	42,085			$	74,388			$	(120,519	)		$	3,929
	Foreign currency translation adjustments, net of taxes	—				6,863				—				6,863				(6,863		)		6,863
	Change in unrecognized actuarial gain	—				(450		)		—				(450		)		450				(450		)
	Other comprehensive income (loss)	3,982				10,406				42,085				80,801				(126,932		)		10,342
	Less: net income attributable to noncontrolling interests	—				—				—				53				—				53
	Comprehensive income (loss) attributable to EnergySolutions	$	3,982			$	10,406			$	42,085			$	80,854			$	(126,932	)		$	10,395
	CONSOLIDATING STATEMENT OF OPERATIONS
	For The Year Ended December 31, 2011
	(in thousands)
			Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
			Solutions,				Solutions				Subsidiaries				Guarantor
			Inc.				LLC								Subsidiaries
Revenue		$	—			$	112,675			$	429,098			$	1,323,993			$	(50,252	)		$	1,815,514
Cost of revenue		—				(59,385		)		(381,240		)		(1,345,453		)		50,252				(1,735,826		)
Gross profit		—				53,290				47,858				(21,460		)		—				79,688
Selling, general and administrative expenses		—				(70,087		)		(25,485		)		(36,814		)		—				(132,386		)
Impairment of goodwill		—				(108,600		)		(65,400		)		—				—				(174,000		)
Equity in income of unconsolidated joint ventures		—				—				11,103				—				—				11,103
Operating income		—				(125,397		)		(31,924		)		(58,274		)		—				(215,595		)
Interest expense		—				(59,747		)		—				(13,667		)		—				(73,414		)
Income from subsidiaries		(256,723		)		(75,613		)		—				—				332,336				—
Other, net		—				4,034				216				53,965				—				58,215
Income (loss) before income tax		(256,723		)		(256,723		)		(31,708		)		(17,976		)		332,336				(230,794		)
Provision (benefit) for income taxes		60,542				—				—				(23,397		)		—				37,145
Net income (loss)		(196,181		)		(256,723		)		(31,708		)		(41,373		)		332,336				(193,649		)
Net income attributable to noncontrolling interests		—				—				—				(2,532		)		—				(2,532		)
Net income (loss) attributable to EnergySolutions		$	(196,181	)		$	(256,723	)		$	(31,708	)		$	(43,905	)		$	332,336			$	(196,181	)
Other comprehensive income (loss):
Net income (loss)		$	(196,181	)		$	(256,723	)		$	(31,708	)		$	(41,373	)		$	332,336			$	(193,649	)
Foreign currency translation adjustments, net of taxes		—				147				—				147				(147		)		147
Change in unrecognized actuarial gain		—				(3,005		)		—				(3,005		)		3,005				(3,005		)
Other comprehensive income (loss)		(196,181		)		(259,581		)		(31,708		)		(44,231		)		335,194				(196,507		)
Less: net loss attributable to noncontrolling interests		—				—				—				(2,532		)		—				(2,532		)
Comprehensive income (loss) attributable to EnergySolutions		$	(196,181	)		$	(259,581	)		$	(31,708	)		$	(46,763	)		$	335,194			$	(199,039	)
CONSOLIDATING BALANCE SHEET
As of December 31, 2013
(in thousands)
	Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
	Solutions,				Solutions,				Subsidiaries				Guarantor
	Inc.				LLC								Subsidiaries
Assets
Cash and cash equivalents	$	—			$	33,556			$	872			$	49,785			$	—			$	84,213
Accounts receivable, net of allowance for doubtful accounts	—				13,793				47,034				229,138				(2,527		)		287,438
Costs and estimated earnings in excess of billings on uncompleted contracts	—				9,884				41,993				36,820				(2,732		)		85,965
Nuclear decommissioning trust fund investments, current portion	—				—				—				112,475				—				112,475
Deferred costs, current portion	—				—				333				91,508				—				91,841
Other current assets	—				$	6,548			4,402				4,918				—				15,868
Total current assets	—				63,781				94,634				524,644				(5,259		)		677,800
Property, plant and equipment, net	—				52,149				60,269				2,058				—				114,476
Goodwill	—				29,764				223,506				56,238				—				309,508
Intangibles, net	—				151,580				21,210				41,571				—				214,361
Restricted cash	—				89,537				3,821				200,538				—				293,896
Nuclear decommissioning trust fund	—				—				—				330,442				—				330,442
Deferred Income Taxes	29,707				—				—				—				—				29,707
Long-term deferred costs less current portion	—				—				—				270,039				—				270,039
Investment in subsidiaries	(65,095		)		693,474				—				—				(628,379		)		—
Intercompany receivable	333,300				—				193,465				8,997				(535,762		)		—
Other long term assets	—				11,275				17,955				151,084				—				180,314
Total Assets	$	297,912			$	1,091,560			$	614,860			$	1,585,611			$	(1,169,400	)		$	2,420,543
Liabilities and Equity
Accounts payable	$	—			$	5,198			$	16,027			$	124,632			$	—			$	145,857
Accrued expenses and other current liabilities	477				56,788				35,075				116,306				(469		)		208,177
Unearned revenue, current portion	—				2,229				23,296				92,515				425				118,465
Facility and equipment decontamination and decommissioning liabilities, current portion	—				—				—				98,175				—				98,175
Other current liabilities	19,261				65,000				—				11,102				—				95,363
Intercompany payable	—				—				5,215				22,626				(27,841		)		—
Total current liabilities	19,738				129,215				79,613				465,356				(27,885		)		666,037
Intercompany loan payable	—				513,136				—				—				(513,136		)		—
Long-term debt, less current portion	—				469,260				—				197,554				—				666,814
Facility and equipment decontamination and decommissioning liabilities, current portion	—				30,375				36,981				311,033				—				378,389
Unearned revenue, less current portion	—				—				—				272,940				—				272,940
Other liabilities, net	10,447				14,669				1,944				141,088				—				168,148
Equity	267,727				(65,095		)		496,322				197,152				(628,379		)		267,727
Noncontrolling interests	—				—				—				488				—				488
Total Liabilities and Equity	$	297,912			$	1,091,560			$	614,860			$	1,585,611			$	(1,169,400	)		$	2,420,543
CONSOLIDATING BALANCE SHEET
As of December 31, 2012
(in thousands)
	Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
	Solutions,				Solutions,				Subsidiaries				Guarantor
	Inc.				LLC								Subsidiaries
Assets
Total current assets	$	6,423			$	128,479			$	115,603			$	545,483			$	(1,453	)		$	794,535
Property, plant and equipment, net	—				60,657				54,112				2,975				—				117,744
Goodwill	—				29,765				223,506				55,337				—				308,608
Intangibles, net	—				160,198				31,186				48,167				—				239,551
Restricted cash	—				110,471				5,867				200,416				—				316,754
Nuclear decommissioning trust fund	—				—				—				445,989				—				445,989
Long-term deferred costs less current portion	—				—				—				360,185				—				360,185
Investment in subsidiaries	(9,554		)		616,038				—				—				(606,484		)		—
Intercompany receivable	303,550				—				108,032				1,302				(412,884		)		—
Other long term assets	—				10,884				16,450				44,762				—				72,096
Total Assets	$	300,419			$	1,116,492			$	554,756			$	1,704,616			$	(1,020,821	)		$	2,655,462
Liabilities and Stockholders’ Equity
Intercompany loan payable	$	—			$	401,015			$	—			$	—			$	(401,015	)		$	—
Intercompany payable	—				—				1,441				11,869				(13,310		)		—
Total current liabilities	—				88,815				67,198				488,779				(12		)		644,780
Long-term debt, less current portion	—				601,836				—				196,741				—				798,577
Facility and equipment decontamination and decommissioning liabilities, current portion	—				31,206				39,358				414,883				—				485,447
Unearned revenue, less current portion	—				—				—				366,710				—				366,710
Other liabilities, net	—				3,174				1,051				54,804				—				59,029
Stockholders’ equity	300,419				(9,554		)		445,708				170,330				(606,484		)		300,419
Noncontrolling interests	—				—				—				500				—				500
Total Liabilities and Equity	$	300,419			$	1,116,492			$	554,756			$	1,704,616			$	(1,020,821	)		$	2,655,462
CONSOLIDATING STATEMENT OF CASH FLOW
For The Year Ended December 31, 2013
(in thousands)
	Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
	Solutions,				Solutions,				Subsidiaries				Guarantor
	Inc.				LLC								Subsidiaries
Cash flow from operating activities
Net cash provided by (used in) operating activities	$	(43,276	)		$	(14,779	)		$	106,447			$	10,399			$	(32,651	)		$	26,140
Cash flow from investing activities
Purchase of investments in nuclear decommissioning trust fund	—				—				—				(884,481		)		—				(884,481		)
Proceeds from sales of nuclear decommissioning trust fund investments	—				—				—				888,916				—				888,916
Purchases of property, plant and equipment	—				(581		)		(14,305		)		(313		)		—				(15,199		)
Proceeds from disposition of property, plant and equipment	—				43				—				6				—				49
Net cash provided by (used in) investing activities	—				(538		)		(14,305		)		4,128				—				(10,715		)
Cash flows from financing activities
Intercompany loans	(18,898		)		102,782				(94,641		)		—				10,757				—
Investment in subsidiary	55,541				(77,435		)		—				—				21,894				—
Repayments of long term debt	—				(87,000		)		—				—				—				(87,000		)
Restricted cash held as collateral of letter of credit obligations	—				21,000				—				—				—				21,000
Proceeds from revolver credit facility	—				5,000				—				—				—				5,000
Payments on revolver credit facility	—				(5,000		)		—				—				—				(5,000		)
Debt financing fees	—				(2,710		)		—				(1,825		)		—				(4,535		)
Capital contributions	14,407				—				—				—				—				14,407
Minimum tax withholding on restricted stock awards	(432		)		—				—				—				—				(432		)
Repurchase of common stock	(7,342		)		—				—				—				—				(7,342		)
Repayments of capital lease obligations	—				(844		)		—				—				—				(844		)
Net cash provided by (used in) financing activities	43,276				(44,207		)		(94,641		)		(1,825		)		32,651				(64,746		)
Effect of exchange rate on cash	—				—				—				(657		)		—				(657		)
Net increase (decrease) in cash and cash equivalents	—				(59,524		)		(2,499		)		12,045				—				(49,978		)
Cash and cash equivalents, beginning of period	—				93,080				3,371				37,740				—				134,191
Cash and cash equivalents, end of period	$	—			$	33,556			$	872			$	49,785			$	—			$	84,213
CONSOLIDATING STATEMENT OF CASH FLOW
For The Year Ended December 31, 2012
(in thousands)
	Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
	Solutions,				Solutions,				Subsidiaries				Guarantor
	Inc.				LLC								Subsidiaries
Cash flow from operating activities
Net cash provided by (used in) operating activities	$	14,994			$	56,441			$	104,932			$	(9,636	)		$	(99,095	)		$	67,636
Cash flow from investing activities
Purchase of investments in nuclear decommissioning trust fund	—				—				—				(877,723		)		—				(877,723		)
Proceeds from sales of nuclear decommissioning trust fund investments	—				—				—				881,672				—				881,672
Purchases of property, plant and equipment	—				(5,428		)		(13,084		)		(1,833		)		—				(20,345		)
Purchases of intangible assets	—				—				(763		)		—				—				(763		)
Proceeds from disposition of property, plant and equipment	—				—				5,336				—				—				5,336
Net cash provided by (used in) investing activities	—				(5,428		)		(8,511		)		2,116				—				(11,823		)
Cash flows from financing activities
Intercompany loan receivable	(5,963		)		31,078				(86,274		)		—				61,159				—
Intercompany loan payable	—				103,430				—				—				(103,430		)		—
Investment in subsidiary	(10,408		)		(92,481		)		(6,776		)		(31,701		)		141,366				—
Dividend: minority interest	—				—				—				(158		)		—				(158		)
Proceeds from issuance of common stock	1,497				—				—				—				—				1,497
Minimum tax withholding on restricted stock awards	(120		)		—				—				—				—				(120		)
Repayments of capital lease obligations	—				(654		)		—				—				—				(654		)
Net cash provided by (used in) financing activities	(14,994		)		41,373				(93,050		)		(31,859		)		99,095				565
Effect of exchange rate on cash	—				—				—				600				—				600
Net increase (decrease) in cash and cash equivalents	—				92,386				3,371				(38,779		)		—				56,978
Cash and cash equivalents, beginning of period	—				694				—				76,519				—				77,213
Cash and cash equivalents, end of period	$	—			$	93,080			$	3,371			$	37,740			$	—			$	134,191
CONSOLIDATING STATEMENT OF CASH FLOW
For The Year Ended December 31, 2011
(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
Cash flow from operating activities
Net cash provided by (used in) operating activities		$	(244,990	)		$	(95,711	)		$	95,135			$	47,534			$	273,572			$	75,540
Cash flow from investing activities
Purchase of investments in nuclear decommissioning trust fund		—				—				—				(1,072,139		)		—				(1,072,139		)
Proceeds from sales of nuclear decommissioning trust fund investments		—				—				—				1,076,635				—				1,076,635
Purchases of property, plant and equipment		—				(7,995		)		(14,970		)		(769		)		—				(23,734		)
Purchases of intangible assets		—				(610		)		—				—				—				(610		)
Acquisition of noncontrolling interests in subsidiaries		—				(1,967		)		—				(519		)		—				(2,486		)
Proceeds from disposition of property, plant and equipment		—				—				236				—				—				236
Net cash (used in) provided by investing activities		—				(10,572		)		(14,734		)		3,208				—				(22,098		)
Cash flows from financing activities
Repayments of long-term debt		—				(30,200		)		—				—				—				(30,200		)
Intercompany loan receivable		(11,676		)		(39,088		)		(23,060		)		—				73,824				—
Intercompany loan payable		—				88,072				(68,389		)		—				(19,683		)		—
Investment in subsidiary		259,583				73,158				—				—				(332,741		)		—
Distributions to noncontrolling interests partners		—				—				—				(4,204		)		—				(4,204		)
Minimum tax withholding on restricted stock awards		(116		)		—				—				—				—				(116		)
Proceeds from exercise of stock options		57				—				—				—				—				57
Repayments of capital lease obligations		—				(695		)		—				—				—				(695		)
Net cash provided by (used in) financing activities		247,848				91,247				(91,449		)		(4,204		)		(278,600		)		(35,158		)
Effect of exchange rate on cash		(2,858		)		(2,858		)		—				(575		)		5,028				(1,263		)
Net increase (decrease) in cash and cash equivalents		—				(17,894		)		(11,048		)		45,963				—				17,021
Cash and cash equivalents, beginning of year		—				18,588				11,048				30,556				—				60,192
Cash and cash equivalents, end of year		$	—			$	694			$	—			$	76,519			$	—			$	77,213

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies	'
Basis of Presentation and Principles of Consolidation	'
	Basis of Presentation and Principles of Consolidation
	The accompanying consolidated financial statements contain the accounts of EnergySolutions, Inc., a Delaware corporation, and its wholly owned subsidiaries and controlled joint ventures after eliminating all intercompany balances and transactions in consolidation. We evaluated all subsequent events through the date that we filed these financial statements in our Annual Report on Form 10-K with the Securities and Exchange Commission (the "SEC").
	We have majority voting rights for one of our minority-owned joint ventures. Accordingly, we have consolidated its operations in our consolidated financial statements and therefore, we recorded the noncontrolling interests, which reflect the portion of the earnings of operations which are applicable to other noncontrolling partners. Assets from our consolidated joint venture can only be used to settle its own obligations. Additionally, our assets cannot be used to settle the joint ventures’ obligations because this minority owned joint venture does not have recourse to our general credit.
Use of Estimates	'
	Use of Estimates
	The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and disclosures of contingencies at the date of the financial statements and revenue and expenses recognized during the reporting period. Significant estimates and judgments made by management include: (i) proportion of completion on long-term contracts, (ii) the costs to close and monitor our landfill and D&D facilities and equipment including D&D of Zion Station, (iii) recovery of long-lived assets, (iv) analysis of goodwill impairment, (v) useful lives of intangibles assets and property, plant and equipment, (vi) costs for unpaid claims and associated expenses related to employee health insurance, (vii) the determination of rate reserve provisions, (viii) provision for a valuation allowance on deferred tax assets, (ix) uncertainties in income taxes, (x) contingencies and litigation and (xi) stock price volatility and expected forfeiture rates for stock option valuations. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ significantly from those estimates.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	We consider all cash on deposit, money market accounts and highly-liquid debt instruments purchased with original maturities of three months or less to be cash and cash equivalents. We maintain cash and cash equivalents in bank deposit and other investment accounts which, at times, may exceed federally insured limits.
Accounts Receivable	'
	Accounts Receivable
	Accounts receivable are recorded at the invoiced amount and generally do not bear interest. The carrying amount of accounts receivable, net of the allowance for doubtful accounts, represents estimated net realizable value. The allowance for doubtful accounts is a valuation allowance that reflects management's best estimate of the amounts that will not be collected. The allowance for doubtful accounts is estimated based on historical collection trends, type of customer, the age of outstanding receivables and existing economic conditions. We generally do not require collateral for accounts receivable; however, we regularly review all accounts receivable balances and assess the collectability of those balances. If events or changes in circumstances indicate that specific receivable balances may be impaired, further consideration is given to the collectability of those balances and the allowance is adjusted accordingly. Account balances are written off against the allowance after all reasonable means of collection have been exhausted and recovery is considered remote.
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts, Unearned Revenue and Retainage	'
	Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts, Unearned Revenue and Retainage.
	Costs and estimated earnings in excess of billings on uncompleted contracts represent amounts recognized as revenue that have not been billed. Unearned revenue represents amounts billed and collected for which revenue has not been recognized. Contracts typically provide for the billing of costs incurred and estimated earnings on a monthly basis or based on contract milestones. We recognize a rate differential for any anticipated liabilities or receivables resulting from the difference between estimated billing rates and actual rates on certain contracts with the federal government. This differential liability or receivable will be settled based upon the completion of audits of the actual rates by the applicable federal government audit agency and negotiation of final indirect rates with the applicable federal agency official. As of December 31, 2013 and 2012, we had outstanding rate reserve receivables totaling $8.1 million and $6.9 million, respectively, which are included in noncurrent assets, outstanding rate reserve liabilities totaling $2.5 million and $1.9 million, respectively, of which $0.8 million and $1.4 million, respectively, are current and are included in accrued expenses and other current liabilities within our consolidated balance sheets. The remaining portion is classified as long term and is included in other noncurrent liabilities in our consolidated balance sheets.
	Retainage represents amounts that are billed or billable to our customers, but are retained by the customer until completion of the project or as otherwise specified in the contract. As of December 31, 2013 and 2012, we had retainage balances of $6.5 million and $4.4 million, respectively, of which $2.7 million and $1.3 million, respectively, were current and included in other current assets in the consolidated balance sheets. The remaining portion is classified as long term and is included in other noncurrent assets in our consolidated balance sheets.
Nuclear Decommissioning Trust Fund Investments	'
	Nuclear Decommissioning Trust Fund Investments
	The nuclear decommissioning trust ("NDT") fund was established solely to satisfy obligations related to the D&D of the Zion Station. The NDT fund holds investments in debt and equity securities directly and indirectly through commingled funds. Investments in the NDT fund are carried at fair value and are classified as trading securities. Gains and losses resulting from adjustments to fair value are recorded in the statements of operations and comprehensive income (loss) as other income (expense), net.
	We consolidate the NDT fund as a variable interest entity. We have a contractual interest in the NDT fund and such interest is a variable interest due to its exposure to the fluctuations caused by market risk. We are the primary beneficiary of the NDT as we benefit from positive market returns and bear the risk of market losses. We are able to control the NDT fund by appointing the trustee, and subject to certain restrictions, we are able to direct the investment policies of the fund.
Variable Interest Entities	'
	Variable Interest Entities
	We participate in joint ventures and partnerships to bid, negotiate and complete specific projects. We are required to consolidate these joint ventures if we hold the majority voting interest or if we meet the criteria under the variable interest model as described below.
	A variable interest entity ("VIE") is an entity with one or more of the following characteristics (a) the total equity investment at risk is not sufficient to permit the entity to finance its activities without additional financial support; (b) as a group, the holders of the equity investment at risk lack the ability to make certain decisions, the obligation to absorb expected losses or the right to receive expected residual returns; or (c) an equity investor has voting rights that are disproportionate to its economic interest and substantially all of the entity's activities are on behalf of the investor.
	Our VIEs may be funded through contributions, loans and/or advances from the joint venture partners or by advances and/or letters of credit provided by our clients. Our VIEs may be directly governed, managed, operated and administered by the joint venture partners. Others have no employees and, although these entities own and hold the contracts with the clients, the services required by the contracts are typically performed by the joint venture partners or by other subcontractors.
	If we are determined to be the primary beneficiary of the VIE, we are required to consolidate it. We are considered to be the primary beneficiary if we have the power to direct the activities that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. In determining whether we are the primary beneficiary, our significant assumptions and judgments include the following:
	•	Identifying the significant activities and the parties that have the power to direct them;
	•	Reviewing the governing board composition and participation ratio;
	•	Determining the equity, profit and loss ratio;
	•	Determining the management-sharing ratio; and
	•	Reviewing the funding and operating agreements.
	Investments in entities in which we do not have a controlling financial interest, but over which we have a significant influence are accounted for using the equity method.
	We continuously evaluate our VIEs as facts and circumstances change to determine whether we are the primary beneficiary in accordance with authoritative guidance. This evaluation may result in consolidation of a previously unconsolidated joint venture or in deconsolidation of a previously consolidated joint venture.
Property, Plant and Equipment	'
	Property, Plant and Equipment
	Property, plant and equipment are stated at cost. Property, plant and equipment acquired through the acquisition of a business are recorded at their estimated fair value at the date of acquisition. Depreciation on property, plant and equipment is calculated on the straight-line method over the estimated useful lives of the assets. Maintenance and repairs that do not extend the lives of the assets are expensed as incurred. Estimated useful lives of the assets are as follows:
			Years
	Buildings, building improvements and land improvements		5 to 31
	Computer hardware and software		1 to 7
	Furniture and fixtures		5 to 7
	Machinery and equipment		5 to 20
	Trucks and vehicles		5 to 15
	Equipment under capital leases is stated at the present value of minimum lease payments and is amortized on the straight-line method over the shorter of the lease term or estimated useful life of the asset.
	We capitalize costs associated with the construction of disposal cells such as excavation, liner construction and drainage systems construction, as well as the asset retirement obligations ("ARO") in accordance with accounting guidance for AROs. These costs are depreciated over the capacity of the individual cells based on a per unit basis as landfill airspace is consumed.
Impairment of Long-Lived Assets	'
	Impairment of Long-Lived Assets
	Impairment charges are recognized for the excess of carrying amount over the fair value of the asset. Long-lived assets such as property, plant and equipment and purchased intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Examples of such events are i) significant adverse changes in its market value, useful life or physical condition; ii) changes in estimated undiscounted future cash flows or forecast that demonstrates continuing losses associated with the use of the intangible asset; or iii) a current expectation that, more likely than not, the intangible asset will be sold or otherwise disposed of before the end of its previously estimated useful life.
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of cost over the fair value of net assets of businesses acquired. Goodwill acquired in a purchase business combination and determined to have an indefinite useful life is not amortized, but instead is tested for impairment annually or when indicators of impairment exist. Intangible assets are amortized based on the period over which the contractual or economic benefits of the intangible assets are expected to be realized.
	We evaluate goodwill at the reporting unit level at least annually for impairment and more frequently if an event occurs or circumstances change that indicate that the asset might be impaired. Under applicable accounting guidance, we are permitted to use a qualitative approach to evaluating goodwill impairment when no indicators of impairment exist and if certain accounting criteria are met. To the extent that indicators exist or the criteria are not met, we use a quantitative approach to evaluate goodwill impairment. Such quantitative impairment assessment is performed using a two-step, fair value based test. The first step compares the fair value of the reporting unit to its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the second step is performed. The second step requires an allocation of fair value to the individual assets and liabilities using purchase price allocation guidance in order to determine the implied fair value of goodwill. If the implied fair value of goodwill is less than the carrying amount, an impairment loss is recorded as a reduction to goodwill and a charge to operating expense.
	Application of the goodwill impairment test requires management judgment, including the identification of reporting units, assigning assets, liabilities and goodwill to the reporting units and determining the fair value of the reporting unit. We estimate the fair value of the reporting units using a combination of an income and a market approach. Forecasts of future cash flow are based on our best estimate of future net sales and operating expenses, based primarily on estimated category expansion, pricing, market segment penetration and general economic conditions. The market approach is calculated based on market multiples for comparable companies as applied to our company-specific metrics. We believe the blended use of both models compensates for the inherent risk associated with either model if used on a stand-alone basis, and this combination is indicative of the factors a market participant would consider when performing a similar valuation. In addition, cash flow forecasts used to assess both goodwill and certain other intangible assets, in particular customer relationships, include assumptions regarding contract wins or extensions.
Facility and Equipment Decontamination and Decommissioning Liabilities	'
	Facility and Equipment Decontamination and Decommissioning Liabilities
	We have responsibility for the cost to D&D our facilities and related equipment, as well as the equipment used at customer sites in our Projects group. These costs are generally paid upon closure of the facilities or disposal of the equipment. We are also responsible for the cost of monitoring our Clive, Utah facility over its post-closure period. We have also acquired the shut down nuclear power plant at the Exelon Zion Station and assumed the related D&D liabilities.
	Accounting guidance for AROs requires us to record the fair value of an ARO as a liability in the period in which we incur a legal obligation associated with the retirement of tangible long-lived assets that result from the acquisition, construction, development or normal use of the asset, except for the Zion Station related ARO. We are also required to record a corresponding asset that we depreciate over the life of the asset. For the Zion Station related ARO we do not record an ARO asset that depreciates because the underlying tangible assets have no future value. Instead, we have capitalized deferred project costs that will be amortized to cost of revenue as the D&D work is performed. After the initial measurement of our AROs, the ARO is adjusted at the end of each period to reflect the passage of time (accretion) and changes in the estimated future cash flows underlying the obligation.
	The cost basis for our landfill assets and related obligation include landfill liner material and installation, excavation for airspace, landfill leachate collection systems, environmental groundwater and air monitoring equipment, directly related engineering and design costs and other capital infrastructure costs. Also included in the cost basis of our landfill assets and related obligation are estimates of future costs associated with final landfill capping, closure and post-closure monitoring activities. These costs are described below:
	•	Final capping—Involves the installation of final cap materials over areas of the landfill where total airspace has been consumed. We estimate available airspace capacity using aerial and ground surveys and other methods of calculation, based on permit-mandated height restrictions and other factors. Final capping AROs are recorded, with a corresponding increase in the landfill asset, as landfill airspace capacity is permitted for waste disposal activities and the cell liner is constructed. Final capping costs are recorded as an asset and a liability based on estimates of the discounted cash flows and capacity associated with the final capping event.
	•	Closure—Involves the remediation of our land surrounding the disposal cell and the disposal of Company-owned property and equipment. These are costs incurred after the site ceases to accept waste, but before the site is certified to be closed by the applicable regulatory agency. These costs are accrued as an ARO, with a corresponding increase in the landfill asset, as airspace is consumed over the life of the landfill. Closure obligations are accrued over the life of the landfill based on estimates of the discounted cash flows associated with performing closure activities.
	•	Post-closure—Involves the maintenance and monitoring of our landfill site that has been certified to be closed by the applicable regulatory agency. Subsequent to landfill closure, we are required to maintain and monitor our landfill site for a 100-year period. These maintenance and monitoring costs are accrued as an ARO, with a corresponding increase in the landfill asset, as airspace is consumed over the life of the landfill. Post-closure obligations are accrued over the life of the landfill based on estimates of the discounted cash flows associated with performing post-closure activities.
	The cost basis of our AROs (and, if applicable, our ARO assets) includes costs to decontaminate, disassemble and dispose of equipment and facilities. We develop our estimates of these obligations using input from our operations personnel, engineers and internal accountants. Our estimates are based on our interpretation of current requirements and proposed regulatory changes and are intended to reflect what a market participant would charge to undertake the obligation. We use historical experience, professional engineering judgment and quoted and actual prices paid for similar work to determine the fair value of these obligations. We recognize these obligations using market prices whether we plan to contract with third parties or perform the work ourselves.
	Costs for the D&D of our facilities and equipment will generally be paid upon the closure of these facilities or the disposal of this equipment. We are obligated under our license granted by the state of South Carolina and the Atlantic Interstate Low-Level Radioactive Waste Compact Implementation Act for costs associated with the ultimate closure of the Barnwell Low-Level Radioactive Waste Disposal Facility in South Carolina and our buildings and equipment located at the Barnwell site (Barnwell closure). Under the terms of the Atlantic Waste Compact Act and our license with the state of South Carolina, we are required to maintain a trust fund to cover the Barnwell closure obligation, which limits our obligation to the amount of the trust fund. We are also obligated under our NRC license and contractual agreements related to Zion Station for costs associated with the D&D of the plant. As part of our Exelon Agreements, we also acquired a trust fund which will be used to pay for these costs. To the extent that the trust fund is not sufficient to pay for all costs of the D&D activities, we will fund the remaining costs from our other operations.
	We are required to make significant estimates in the determination of our AROs and the related assets, if applicable. Because final landfill capping, closure and post-closure obligations and D&D obligations are measured using present value techniques, changes in the estimated timing of the related activities would have an effect on these liabilities, related assets and resulting operations.
	Changes in inflation rates or the estimated costs, timing or extent of the required future capping, closure, post-closure and other D&D activities typically result in both: (i) a current adjustment to the recorded liability and asset and (ii) a change in the liability and asset amounts to be recorded prospectively over the remaining life of the asset in accordance with our depreciation policy. However, for the Zion Station related ARO, these changes are not capitalized or depreciated as an ARO asset but are instead recorded directly to cost of revenue in the consolidated statements of operations and comprehensive income (loss).
	We update our final capping, closure and post-closure cost estimates either annually or more frequently if changes in the underlying conditions occur. These estimates are based on current technology, regulations and burial rates. Changes in these factors could have a material impact on our estimates. If we perform work internally related to AROs, we will recognize a gain for the difference between our actual costs incurred and the recorded ARO, which includes an element of profit. While other ARO gains are classified as a reduction in SG&A expenses, we classify the recognition of the third-party profit included in the Zion Station ARO in cost of revenue as activities are performed because we are undertaking these activities pursuant to our core business strategy and fulfilling the cost of the contract represents ongoing major or central operations of EnergySolutions.
Self-Insurance and Recoveries	'
	Self-Insurance and Recoveries
	We have retained a portion of the financial risk related to our employee health insurance plan. The exposure for unpaid claims and associated expenses, including incurred but not reported losses, generally is estimated by considering pending claims and historical trends and data.
Other long term liabilities	'
	Other long term liabilities
	We recognize a liability for contract termination costs associated with an exit activity for costs that will continue to be incurred under a lease for its remaining term without economic benefit to us, initially measured at its fair value at the cease-use date. The fair value is determined based on the remaining lease rentals, adjusted for the effects of any prepaid or deferred items recognized under the lease, and reduced by estimated sublease rentals.
Share-Based Payment	'
	Share-Based Payment
	We recognized shared based compensation costs in the consolidated statement of operations and comprehensive income (loss) over the instruments' vesting periods based on the instruments' fair values on the measurement date, which is generally the date of the grant. In our share-based compensation strategy we have utilized a combination of stock options and restricted stock that vest over time based on service and performance. For time-based stock options and restricted stock, compensation expense is recognized over the vesting period from the vesting commencement date using the straight-line method. For performance based stock options and restricted stock compensation, expense is recognized over the vesting period beginning at the grant date if it is probable that performance targets will be achieved. If prior to the performance measurement date, it is no longer probable that the performance targets will be achieved, the expense related to the grant will be adjusted accordingly and prior recognized compensation expense will be reversed. Also, if at the performance measurement date the performance targets are not achieved, the expense related to the grants will be adjusted to the earned amounts and compensation expense will also be adjusted accordingly.
	We use the Black-Scholes valuation model to estimate the fair value of stock options. Option valuation methods, including Black-Scholes, require the input of assumptions including the risk-free interest rate, expected term and volatility rate. For awards with a market condition, we use a Monte Carlo valuation model. See Note 13 for further discussion regarding the assumptions used in our valuation models.
Revenue and Cost of Revenue	'
	Revenue and Cost of Revenue
	Revenue Recognition
	We record revenue when all of the following conditions exist: (i) evidence of an agreement with our customer; (ii) work has actually been performed; (iii) the amount of revenue is fixed or determinable and (iv) collection from our customer is reasonably assured. If we have multiple contracts with a single customer, we evaluate the circumstances surrounding each contract to determine whether or not the contracts are required to be grouped or segmented for revenue recognition purposes.
	We recognize revenues from engineering and technical support services contracts using the percentage-of-completion method as project progress occurs. Certain contracts for services that are non-linear in nature, require complex, non-repetitive tasks or involve a non-time-based scope of work. In these contracts, the earnings process is not fulfilled upon the achievement of milestones, but rather over the life of the contract. Evaluation of the obligations and customer requirements on these contracts does not produce objective, quantifiable output measures that reflect the earnings process for revenue recognition. Therefore, in these situations, we use a cost-to-cost approach to determine revenue. A cost-to-cost approach accurately reflects our obligations and performance on these contracts. For the years ended December 31, 2013, 2012, and 2011, revenue calculated using a cost-to-cost approach, including Zion Station project revenues, were $149.3 million, $163.5 million and $175.0 million, respectively.
	Our contracts may include the following multiple deliverables: transportation services, disposal services, training, on-site support, and warranties. For contracts containing multiple deliverables, we evaluate whether each deliverable should be accounted for separately or if they should be combined together for revenue recognition purposes. If the determination is made that separate accounting is required, we follow the applicable revenue recognition guidance in allocating contract value between the identified deliverables.
	Revisions to revenue, cost and profit estimates, or measurements of the extent of progress toward completion, are changes in accounting estimates accounted for in the period of change (cumulative catch-up method). Contracts typically provide for periodic billings on a monthly basis or based on contract milestones. Amounts recognized as revenue that have not been billed are included in costs and estimated earnings in excess of billings on uncompleted contracts. Amounts billed and collected for which revenue has not been recognized are included in unearned revenue.
	Accounting for revenue earned under our contracts may require assessments that include an estimate of the amount that has been earned on the contract and are usually based on the volumes that have been processed or disposed, milestones reached or the time that has elapsed under the contract. Each of our contracts is unique with regard to scope, schedule and delivery methodology. Accordingly, each contract is reviewed to determine the most reliable measure of completion for revenue recognition purposes.
	Contract Types
	Cost-reimbursable award or incentive-fee contracts—We are reimbursed for allowable costs in accordance with Federal Acquisition Regulation ("FAR"), Cost Accounting Standards ("CAS") or contractual provisions. If our costs exceed the contract ceiling or are not allowable under the provisions of the contract FAR or CAS, we may not be able to obtain reimbursement for such costs. We earn award and incentive fees in addition to cost reimbursements if we meet certain contract provisions, including schedule, budget, and safety milestones. Monthly assessments are made to measure the amount of revenue earned in accordance with established contract provisions. We receive award and incentive fees on certain contracts, which are accrued when estimable and collection is reasonably assured.
	Fixed-price contracts—Under these contracts, we receive a fixed amount of revenue irrespective of the actual costs we incur. Revenue is recognized using the proportional performance method of accounting using appropriate output measures, where estimable, or on other input measures such as proportion of costs incurred to total estimated contract costs.
	Unit-rate contracts— We recognized revenue using the proportional performance method of accounting as units are completed based on contractual unit rates. Revenue from our LP&D segment is derived primarily through unit-rate contracts for the shipping, processing and disposal of radioactive materials. A unit-rate contract is essentially a fixed-price contract with the only variable being units of work performed. These contracts generally provide that we will process and dispose of substantially all of the low-level radioactive waste generated by our customers for a fixed, pre-negotiated price per cubic foot, depending on the type of radioactive material being disposed.
	Time and materials contracts— Under these contracts, we negotiate hourly billing rates and charge our clients based on the actual time that we spend on a project. In addition, clients reimburse us for our actual out-of-pocket costs of materials and other direct incidental expenditures that we incur in connection with our performance under the contract. The majority of our time-and-material contracts are subject to maximum contract values and, accordingly, revenues under these contracts are generally recognized under the percentage-of-completion method. However, time-and-materials contracts that are service-related contracts are accounted for utilizing the proportional performance method. Our time-and-materials contracts also generally include annual billing rate adjustment provisions.
	Change Orders
	We record contract claims and pending change orders, including requests for equitable adjustments (“REAs”) when collection of revenue is reasonably assured, which generally is when accepted in writing by the customer. The costs to perform the work related to these claims and pending change orders including REAs are included in our financial statements in the period that they are incurred and are included in our estimates of contract profitability.
	Provision for Loss
	Provision for estimated contract losses are recorded when they are identifiable and include all estimated direct costs to complete the contract (excludes future selling, general and administrative costs expected to be allocated to the contract). Contract claims and change orders are included in total estimated contract revenue when it is probable that the change order will result in a bona fide addition to contract value and can be reliably estimated. Costs incurred for bidding and obtaining contracts are expensed as incurred.
Advertising Costs	'
	Advertising Costs
	We expense advertising costs as incurred. Advertising costs are included in selling, general and administrative expenses.
Income Taxes	'
	Income Taxes
	The Company recognizes income taxes under the asset and liability method. This approach requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant judgment is required in determining income tax provisions and in evaluating tax positions.
	We account for income taxes in accordance with authoritative accounting guidance. Judgment is required in determining our provision for income taxes. In the normal course of business, we may engage in numerous transactions every day for which the ultimate tax outcome (including the period in which the transaction will ultimately be included in taxable income or deducted as an expense) is uncertain. Additionally, the tax returns we file are subject to audit and investigation by the Internal Revenue Service ("IRS"), state agencies in the U.S. and by foreign government agencies. Deferred tax assets are reduced by the amount of any tax benefits that are not expected to be realized.
	We account for unrecognized tax benefits in accordance with authoritative guidance for uncertainty in income taxes which requires us to recognize in our financial statements the impact of a tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. We recognize interest and penalties related to unrecognized tax benefits as a component of the provision for income taxes. We recognized interest related to tax refunds as a component of other income.
	Our income tax expense and our effective tax rate are determined from earnings before income taxes less net income attributable to the noncontrolling interest related to consolidations.
New Accounting Pronouncements	'
	New Accounting Pronouncements
	In January 2014, the Financial Accounting Standards Board ("FASB") issued an update on accounting for service concession arrangements. The update clarifies that, unless certain circumstances are met, operating entities should not account for certain concession arrangements with public-sector entities as leases and should not recognize the related infrastructure as property, plant and equipment. The update is effective for interim and annual reporting periods beginning after December 15, 2014. Management does not expect the adoption of this update to have a material impact on the Company's financial position, results of operations or cash flows.
	In July 2013, the FASB issued guidance related to presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance eliminates diversity in practice for presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is available to reduce the taxable income or tax payable that would result from disallowance of a tax position. This guidance is effective for interim and annual reporting periods beginning after December 15, 2013 and should be applied prospectively to all unrecognized tax benefits that exist at the effective date. The Company does not expect that the adoption of this guidance will have a material impact on the consolidated financial statements.
	In March 2013, the FASB issued guidance related to foreign currency matters. The standard update addresses the accounting for the release of cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a business unit or a group of assets that do not produce a profit within a foreign entity. Under such circumstances, a parent company is required to release any related currency adjustments to earnings. The currency adjustment is released into earnings only if the sale or transfer results in a complete or substantially complete liquidation of the foreign entity in question. The standard update is effective for interim and annual reporting periods beginning after December 15, 2013. The Company does not expect that the adoption of this guidance will have a material impact on the consolidated financial statements.
	In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income. The amendments in the update did not change the current requirements for reporting net income or other comprehensive income in financial statements. The new amendments require an organization to present (either on the face of the statement where net income is presented or in the notes) the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income if the item reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. Additionally, for other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP to provide additional detail about those amounts. The amendments are effective for reporting periods beginning after December 15, 2012. The adoption of this did not have a material impact on the Company’s financial position, results of operations or cash flows.
Commitments and Contingencies	'
	Commitments and Contingencies
	Liabilities for loss contingencies including environmental remediation costs arising from claims not within the scope of authoritative accounting guidance for asset retirement obligations, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. Recoveries for environmental remediation costs from third parties are recorded when agreed upon with a third party.
Comprehensive Income (Loss)	'
	Comprehensive Income (Loss)
	Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss). Other comprehensive income (loss) includes foreign currency translation gains and losses resulting from translating asset and liability accounts of our foreign subsidiaries from their local currencies at the exchange rates in effect at the balance sheet date, and gains or losses associated with pension or other post-retirement benefits, that are not recognized immediately as a component of net periodic benefit cost. We present components of other comprehensive income (loss) in the consolidated statements of operations and comprehensive income (loss), net of related tax effects.
Business Combination	'
	Business Combination
	The cost of an acquired company is assigned to the tangible and intangible assets purchased and the liabilities assumed on the basis of their fair values at the date of acquisition. The determination of fair values of assets and liabilities acquired requires us to make estimates and use valuation techniques when a market value is not readily available. Any excess of purchase price over the fair value of net tangible and intangible assets acquired is allocated to goodwill. Transaction costs associated with business combinations are expensed as they are incurred.
Restructuring	'
	Restructuring
	We recognize expenses related to employee termination benefits when the benefit arrangement is communicated to the employee and no significant future services are required of the employee. If an employee is required to render service until a specific termination date, which goes beyond the legal requirement or contractual notice period, in order to receive the termination benefits, the fair value of the associated liability would be recognized ratably over the future service period. Severance costs are determined in accordance with local statutory requirements and our policies.
	We recognize the present value of facility lease termination obligations, net of estimated sublease income and other exit costs, when there are future lease payments with no future economic benefit. Sublease income is estimated based on current market rates for similar properties. If we are unable to sublease the facility on a timely basis or if we are forced to sublease the facility at lower rates due to changes in market conditions, we would adjust the restructuring liability accordingly.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies	'
Schedule of estimated useful lives of the assets	'
	Estimated useful lives of the assets are as follows:
		Years
	Buildings, building improvements and land improvements	5 to 31
	Computer hardware and software	1 to 7
	Furniture and fixtures	5 to 7
	Machinery and equipment	5 to 20
	Trucks and vehicles	5 to 15

Trust_Fund_Investments_Tables

Trust Fund Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Schedule of NDT fund investments	'
	NDT fund investments consisted of the following (in thousands):
		As of December 31, 2013										As of December 31, 2012
		Amortized		Gross		Gross			Estimated			Amortized		Gross		Gross			Estimated
		cost		unrealized		unrealized			fair value			cost		unrealized		unrealized			fair value
				gains		losses								gains		losses
	Assets
	Receivables for securities sold	$	4,568	$	—	$	—		$	4,568		$	7,422	$	—	$	—		$	7,422
	Investments
	Corporate debt securities	201,377		8,050		(2,352		)	207,075			223,662		17,940		(575		)	241,027
	Equity securities	400		13		—			413			10,117		4,249		(61		)	14,305
	Direct lending securities	134,161		11,476		(3,387		)	142,250			98,138		6,026		(1,721		)	102,443
	Debt securities issued by states of the U.S.	23,725		761		(468		)	24,018			31,306		3,806		—			35,112
	Cash and cash equivalents	29,686		—		—			29,686			23,686		—		—			23,686
	Commingled funds	—		—		—			—			4,017		527		—			4,544
	Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	35,685		77		(855		)	34,907			166,925		3,912		(880		)	169,957
	Total investments	425,034		20,377		(7,062		)	438,349			557,851		36,460		(3,237		)	591,074
	Net assets held by the NDT fund	$	429,602	$	20,377	$	(7,062	)	442,917			$	565,273	$	36,460	$	(3,237	)	598,496
	Less: current portion								(112,475		)								(152,507		)
	Long-term investments								$	330,442									$	445,989

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'
Schedule of the NDT fund investments measured at fair value	'
	The following table presents the NDT fund investments measured at fair value (in thousands):
		As of December 31, 2013										As of December 31, 2012
		Total			Quoted Prices			Significant		Significant		Total		Quoted Prices		Significant		Significant
		Investments			in Active			Other		Unobservable		Investments		in Active		Other		Unobservable
		at Fair			Markets for			Observable		Inputs		at Fair		Markets for		Observable		Inputs
		Value			Identical			Inputs		Level 3		Value		Identical		Inputs		Level 3
					Assets			Level 2						Assets		Level 2		(revised)
					Level 1									Level 1
	Assets
	Receivables for securities sold	$	4,568		$	4,568		$	—	$	—	$	7,422	$	7,422	$	—	$	—
	Investments
	Cash and cash equivalents	29,686			29,686			—		—		23,686		23,686		—		—
	Fixed income securities(1)	266,000			34,907			231,093		—		446,096		125,605		320,491		—
	Equity securities(2)	413			413			—		—		14,305		14,305		—		—
	Direct lending securities(3)	142,250			—			—		142,250		102,443		—		—		102,443
	Units of participation(4)	—			—			—		—		4,544		—		4,544		—
	Total investments	438,349			65,006			231,093		142,250		591,074		163,596		325,035		102,443
	Net assets held by the NDT fund	$	442,917		$	69,574		$	231,093	$	142,250	$	598,496	$	171,018	$	325,035	$	102,443
	_____________________________
	-1	For fixed income securities, multiple prices from pricing services are obtained from pricing vendors whenever possible, which enables cross- provider validations in addition to checks for unusual daily movements. A primary price source is identified based on asset type, class or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary price source of a given security if the portfolio managers challenge an assigned price and the trustee determines that another price source is considered to be preferable. U.S. Treasury securities are categorized as Level 1 because they trade in a highly liquid and transparent market. Investments with maturities of three months or less when purchased, including certain short-term fixed income securities, are considered cash equivalents and are also categorized as Level 1. The fair values of fixed income securities, excluding U.S. Treasury securities, are based on evaluated prices that reflect observable market information, such as actual trade information or similar securities, adjusted for observable differences and are categorized in Level 2.
	-2	With respect to individually held equity securities, the trustee obtains prices from pricing services, whose prices are obtained from direct feeds from market exchanges. The fair values of equity securities held directly by the trust fund are based on quoted prices in active markets and are categorized in Level 1. Equity securities held individually are primarily traded on the New York Stock Exchange and NASDAQ Global Select Market, which contain only actively traded securities due to the volume trading requirements imposed by these national securities exchanges.
	-3	Direct lending securities are investments in managed funds that invest in private companies for long-term capital appreciation. The fair value of these securities is determined using either an enterprise value model or a bond valuation model. The enterprise value model develops valuation estimates based on valuations of comparable public companies, recent sales of private and public companies, discounting the forecasted cash flows of the portfolio company, estimating the liquidation or collateral value of the portfolio company or its assets, considering offers from third parties to buy the portfolio company, its historical and projected financial results, as well as other factors that may impact value. Significant judgment is required in the applications of discounts or premiums applied to the prices of comparable companies for factors such as size, marketability and relative performance. Under the bond valuation model, expected future cash flows are discounted using a discount rate. The discount rate is composed of a market based rate for similar credits in the public market and an internal credit rate based on the underlying risk of the credit. Investments in direct lending funds are categorized as Level 3 because the fair value of these securities is based largely on inputs that are unobservable and also utilize complex valuation models. Investments in direct lending securities typically cannot be redeemed until maturity of the term loan.
	Management determines the value of Level 3 investments by considering third party valuations and have concluded that quantitative information about significant unobservable inputs used in valuing these investments is not reasonably available. This includes information regarding the sensitivity of the fair values to changes in the unobservable inputs. We obtain annual valuations from the fund managers and gain an understanding of the inputs and assumptions used in preparing the valuations. We also conclude on the reasonableness of the fair value of these investments. We obtain quarterly reports from the fund managers and review for consistency and reasonableness with regards to the valuations of these investments that were analyzed at the most recent year-end.
	-4	Units of participation, which are similar to mutual funds, are maintained by investment companies and hold certain investments in accordance with stated fund objectives. The fair values of short-term commingled funds held within the trust funds, which generally hold short-term fixed income securities and are not subject to restrictions regarding the purchase or sale of shares, are derived from observable prices. Units of participation are categorized as Level 2 because the fair value of these securities is based primarily on observable prices of the underlying securities.
Schedule of the rollforward for Level 3 assets and liabilities measured at fair value on a recurring basis	'
	The following table presents the rollforward for Level 3 assets and liabilities measured at fair value on a recurring basis (in thousands):
	Direct Lending Securities	December 31,			December 31,
		2013			2012
	Beginning balance	$	102,443		$	61,998
	Purchases and issuances	76,505			82,285
	Sales, dispositions and settlements	(42,167		)	(39,706		)
	Realized gains and losses	1,685			(2,940		)
	Change in unrealized gains and losses	3,784			806
	Ending balance	$	142,250		$	102,443

Joint_Ventures_Tables

Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Schedule of financial information for unconsolidated joint ventures	'
	The table below presents unaudited financial information, for our unconsolidated joint ventures (in thousands):
		December 31,		December 31,
		2013		2012
	Current assets	$	55,229	$	49,979
	Current liabilities	30,606		25,127
		For The Years Ended December 31,
		2013		2012		2011
	Revenue	$	133,891	$	153,692	$	158,729
	Gross profit	14,576		20,547		31,940
	Net income	13,571		20,001		31,324
	Net income attributable to EnergySolutions	4,465		7,392		11,103
Schedule of Ownership Percentage in Equity Method Investments	'
	Our percentage of ownership of unconsolidated joint ventures as of December 31, 2013 was:
		Percentage of
		Ownership
	Global Threat Reduction Solutions, LLC	49	%
	LATA/Parallax Portsmouth, LLC	49	%
	SempraSafe, LLC	49	%
	TPMC EnergySolutions Environmental Services, LLC	49	%
	Washington River Protection Solutions, LLC	40	%
	Weskem, LLC	27.6	%
	Idaho Treatment Group, LLC	15	%
	West Valley Environmental Services LLC	10	%

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Components of property, plant and equipment	'
	Property, plant and equipment consist of the following (in thousands):
		31-Dec-13			31-Dec-12
	Land and land improvements	$	29,203		$	28,679
	Buildings and improvements	38,194			37,233
	Computer hardware and software	23,306			24,135
	Furniture and fixtures	4,067			5,085
	Landfill	69,876			70,634
	Machinery and equipment	99,533			93,724
	Trucks and vehicles	14,574			13,844
	Leasehold improvements	8,296			8,235
	Capital leases	8,005			6,950
	Construction in progress	11,667			9,149
		306,721			297,668
	Less accumulated depreciation and amortization	(192,245		)	(179,924		)
	Property, plant and equipment, net	$	114,476		$	117,744
Schedule of property, plant and equipment acquired under capital leases	'
	A detail of the property, plant and equipment acquired under capital leases was as follows (in thousands):
		31-Dec-13			31-Dec-12
	Computer equipment	$	4,106		$	3,353
	Machinery and equipment	—			668
	Trucks and vehicles	3,899			2,929
		8,005			6,950
	Less accumulated amortization	(4,904		)	(4,439		)
	Machinery and equipment	$	3,101		$	2,511

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill [Table Text Block]	'
	Goodwill consisted of the following (in thousands):
		Gross		Foreign			Accumulated Impairment Losses			Total Goodwill
		Carrying		Currency
		Amount		Translation
	Beginning Balance at December 31, 2012	$	526,334	$	(8,726	)	$	(209,000	)	$	308,608
	Acquisitions	—		—			—			—
	Other adjustments	—		900			—			900
	Ending balance at December 31, 2013	$	526,334	$	(7,826	)	$	(209,000	)	$	309,508

Other_Intangible_Assets_Tables

Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'
Schedule of other intangible assets	'
	Other intangible assets consisted of the following (in thousands):
		As of December 31, 2013								As of December 31, 2012
		Gross			Accumulated			Weighted		Gross			Accumulated				Weighted
		Carrying			Amortization			Average		Carrying			Amortization				Average
		Amount						Remaining		Amount							Remaining
								Useful Life									Useful Life
	Permits	$	243,173		$	(86,263	)	15.8 years		$	243,130		$	(76,406	)		16.9 years
	Customer relationships	161,903			(107,718		)	4.8 years		161,429			(93,552		)		5.6 years
	Technology and other	15,490			(12,224		)	2.1 years		15,490			(10,540		)		3.1 years
	Total intangibles	$	420,566		$	(206,205	)	12.8 years		$	420,049		$	(180,498	)		13.4 years
Schedule of Expected Amortization Expense	'
	Estimated annual amortization expense for each of the next five years is as follows (in thousands):
			2014			2015			2016			2017				2018
	Estimated annual amortization expense		$	24,667		$	21,690		$	19,660		$	18,004			$	17,040

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of outstanding long-term debt	'
	Our outstanding long-term debt consists of the following (in thousands):
		December 31,			December 31,
		2013			2012
	Term loan facilities due through 2016(1)	$	440,000		$	527,000
	Term loan unamortized discount	(5,519		)	(8,741		)
	Senior notes, 10.75% due through 2018	300,000			300,000
	Senior notes unamortized discount	(2,667		)	(3,090		)
	Total debt	731,814			815,169
	Less: current portion	(65,000		)	(16,592		)
	Total long-term debt	$	666,814		$	798,577
	______________________________
	-1	The variable interest rate on borrowings under our senior secured credit facility was 7.25% as of December 31, 2013 and 6.25% as of December 31, 2012.
Schedule of maturities of long-term debt	'
	Scheduled annual principal payments of our outstanding long-term debt for the years subsequent to December 31, 2013 are as follows (in thousands):
	2014	$	65,000
	2015	—
	2016	375,000
	2017	—
	2018	300,000
	Outstanding long-term debt	740,000
	Less: unamortized discounts	(8,186		)
	Long-term debt net of discounts	$	731,814
Schedule of debt instrument redemption prices	'
	Period	Redemption
		Price
	2014	105.375	%
	2015	102.688	%
	2016 and thereafter	100	%

Tables

(Tables)	12 Months Ended
	Dec. 31, 2013
Payables and Accruals [Abstract]	'
Schedule of Accrued Liabilities	'
	Accrued expenses and other current liabilities consist of the following (in thousands):
		December 31,		December 31,
		2013		2012
	Accrued project and contract costs	$	55,364	$	67,880
	Salaries and labor related expenses	80,628		67,214
	Taxes payable (1)	28,829		23,617
	U.K. severance	23,055		5,695
	Interest payable on long term debt obligations	12,483		13,421
	Professional fees	2,867		3,241
	Other accrued expenses	4,951		12,478
		$	208,177	$	193,546
	______________________________
	(1)Includes federal and state income tax, property tax, domestic and international sales taxes and waste taxes.

EquityBased_Compensation_Table

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
	The key assumptions used in the Monte Carlo model for phantom stock awards were as follows:
		2012
	Expected life of Phantom Stock Units (in years)	3.0 to 6.0
	Risk-free interest rate	0.41%
	Expected volatility	68.40%
	Lack of marketability discount (for equity phantom stock awards)	15%
	The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model. The key assumptions used in the Black-Scholes model for options granted were as follows:
		2013		2012		2011
	Expected life of option (years)	6.5		6		6
	Risk-free interest rate	1.39%		1.10%		2.1% to 2.7%
	Expected volatility	72.20%		44.30%		42.4% to 46.0%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
	A summary of stock option activity is presented below:
		Options			Weighted		Weighted	Aggregate
					average		average	intrinsic value (in thousands)
					exercise price		remaining
							life (years)
	Outstanding, December 31, 2010	6,602,167			$	18.26	—	$	33.1
	Granted	484,600			6.22		—	—
	Exercised	(10,350	)		5.55		—	—
	Forfeited or expired	(545,692	)		14.7		—	—
	Outstanding, December 31, 2011	6,530,725			17.55		—	—
	Granted	506,000			4.21		—	—
	Exercised	—			—		—	—
	Forfeited or expired	(4,539,129	)		22.2		—	—
	Outstanding, December 31, 2012	2,497,596			6.29		6.91	—
	Granted	34,687			1,000		9.4	—
	Exercised	—			—		—	—
	Forfeited or expired	(2,497,596	)		6.29		—	—
	Outstanding, December 31, 2013	34,687			1,000			—
	Options vested and expected to vest, December 31, 2013	34,687			—		—	—
	Options exercisable, December 31, 2013	—			—		—	—
Schedule of Nonvested Share Activity [Table Text Block]	'
	A summary of restricted stock activity is presented below:
		Shares			Weighted average
					grant-date
					fair value
	Non-vested shares, December 31, 2010	708,898			5.6
	Granted	694,300			5.53
	Vested	(302,928	)		4.99
	Forfeited	(102,509	)		5.72
	Non-vested shares, December 31, 2011	997,761			5.81
	Granted	861,888			3.87
	Vested	(387,507	)		5.31
	Forfeited	(177,949	)		4.83
	Non-vested shares, December 31, 2012	1,294,193			4.8
	Granted	—
	Vested	(1,264,122	)		4.8
	Forfeited	(30,071	)
	Non-vested shares, December 31, 2013	—			—

Facility_and_Equipment_Deconta1

Facility and Equipment Decontamination and Decommissioning (Tables)	12 Months Ended
	Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Schedule of facility and equipment D&D liabilities	'
	Our facility and equipment D&D liabilities consist of the following (in thousands):
		December 31,			December 31,
		2013			2012
	Facilities and equipment ARO—Zion Station	$	409,190		$	553,302
	Facilities and equipment ARO—Clive, UT	28,106			29,300
	Facilities and equipment ARO—other	35,446			35,757
	Total facilities and equipment ARO	472,742			618,359
	Barnwell Closure	3,822			5,845
		476,564			624,204
	Less: current portion	(98,175		)	(138,757		)
		$	378,389		$	485,447
Rollforward of facilities and equipment ARO	'
		December 31,			December 31,
		2013			2012
	Beginning Balance as of January 1	$	618,359		$	750,649
	Liabilities incurred	—			187
	Liabilities settled	(171,167		)	(159,776		)
	Accretion expense	26,308			30,017
	ARO estimate adjustments	(758		)	(2,718		)
	Ending liability	$	472,742		$	618,359
Schedule of Asset Retirement Obligation Estimate Calculated by Applying Inflation Rate and Credit Adjusted Risk Free Discount Rate	'
	The inflation rate and credit-adjusted risk-free discount rate used to calculate the ARO estimate is as follows:
		Inflation Rate		Credit-Adjusted
				Risk-Free
				Discount Rate
	31-Dec-13	2.27% - 2.60%		2.84% - 10.88%
	31-Dec-12	2.27% - 2.78%		2.84% - 9.09%

Income_Taxes_Income_Taxes_Tabl

Income Taxes Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	'
	Income before provision for income taxes consists of the following (in thousands):
			For the Year Ended December 31,
			2013				2012				2011
	U.S. income		$	(80,533	)		$	(9,837	)		$	(258,673	)
	Foreign income		33,637				31,725				27,879
	Income before taxes		$	(46,896	)		$	21,888			$	(230,794	)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	Income taxes consist of the following (in thousands):
			For the Year Ended December 31,
			2013				2012				2011
	Current:
	Federal		$	5,961			$	9,631			$	6,588
	State		1,070				580				(117		)
	Foreign		10,229				9,575				7,196
			17,260				19,786				13,667
	Deferred
	Federal		(5,959		)		940				(42,232		)
	State		—				85				(5,720		)
	Foreign		(3,532		)		(2,852		)		(2,860		)
			(9,491		)		(1,827		)		(50,812		)
			$	7,769			$	17,959			$	(37,145	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	Income taxes are reconciled to the amount computed by applying the statutory federal income tax rate of 35% to income before income taxes as follows (in thousands):
		For The Year Ended December 31,
		2013				2012				2011
	Federal income taxes at statutory rate	$	(16,414	)		$	7,661			$	(80,778	)
	State income taxes, net of Federal tax benefit	(277		)		883				(6,123		)
	Meals & entertainment	563				633				604
	UK research and development	(3,073		)		(4,161		)		(4,925		)
	US research and development	(1,200		)		—				(1,376		)
	Zion trust income	1,799				16,640				15,125
	Foreign tax rate differential	(3,536		)		(3,331		)		(1,832		)
	Trust rate differential	(780		)		(8,314		)		(8,103		)
	Disallowed and excess compensation	4,434				447				—
	Goodwill impairment	—				—				22,890
	Change in valuation allowance	85,135				(595		)		35,149
	Effect of §338(g) election	(68,751		)		—				—
	US tax on foreign dividend, net of foreign tax credit	—				1,600				—
	US deferred tax on undistributed foreign earnings	5,840				—				—
	Tax exempt interest income	(386		)		(618		)		—
	Disallowed transaction costs	2,834				—				—
	Stock compensation deferred adjustment	1,159				9,967				—
	Return to provision true-ups with full valuation allowance	—				(2,277		)		(3,373		)
	Change in contingency reserve	—				(375		)		(3,271		)
	Other	422				(201		)		(1,132		)
	Income tax expense(benefit)	$	7,769			$	17,959			$	(37,145	)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	The significant components of our deferred tax assets and liabilities consist of the following (in thousands):
		December 31, 2013				December 31, 2012
	Deferred tax assets - current
	Accrued compensation	$	14,294			$	6,404
	Accrued expenses	2,254				5,036
	Allowance for bad debt	1,807				664
	Net operating loss carryforwards	1,128				—
	Zion ARO liability	36,083				50,998
	Zion deferred revenue	33,288				46,970
	Zion cost capitalization	—				7,105
	Other	15				954
	Deferred tax assets - current	88,869				118,131
	Valuation allowance	(25,164		)		(8,643		)
	Deferred tax assets current, net of valuation allowance	63,705				109,488
	Deferred Tax Liabilities - current
	Prepaid expenses	(972		)		(2,209		)
	Zion trust unrealized gain/loss	(698		)		(1,188		)
	Investment in Zion trust	(41,293		)		(55,044		)
	Zion deferred costs	(33,101		)		(46,783		)
	Deferred revenue	(9,558		)		(4,426		)
	Deferred tax on undistributed foreign earnings	(6,058		)		—
	Other	(1,260		)		(939		)
	Net deferred tax liabilities current	$	(29,235	)		$	(1,101	)
	Deferred tax assets—noncurrent:
	Plant, equipment and intangible assets (including tax-deductible goodwill) principally due to differences in depreciation and amortization	$	48,569			$	9,660
	Asset retirement obligations other than Zion ARO	25,179				17,141
	Accrued rate and contract reserves	275				997
	Deferred rent	3,506				—
	Stock compensation	723				2,694
	AMT credit carryover	1,839				1,388
	Foreign tax credit carryforward	14,353				14,582
	Net operating loss carryforwards	22,844				23,854
	General business credit carryforward	10,387				7,274
	Capital loss carryforward	7,934				—
	Zion ARO liability	114,113				152,361
	Zion deferred revenue	100,316				133,635
	Zion cost capitalization	—				16,578
	Investment in joint ventures	13,130				—
	Deferred revenue	8,941				439
	Other	957				2,802
	Deferred tax assets—non current	373,066				383,405
	Valuation allowance	(118,924		)		(40,297		)
	Deferred tax assets—noncurrent, net of valuation allowance	254,142				343,108
	Deferred tax liabilities—noncurrent:
	Plant, equipment and intangible assets principally due to differences in depreciation and amortization	(1,998		)		(47,030		)
	Accrued rate and contract reserves	(2,435		)		(2,015		)
	Reclamation	(8,255		)		(9,595		)
	Investment in NDT fund	(121,228		)		(160,968		)
	Unrealized gains in NDT Fund investments	(2,051		)		(7,478		)
	Zion deferred costs	(99,249		)		(132,381		)
	Other	(1,716		)		(4,148		)
	Net deferred tax assets (liabilities) noncurrent	$	17,210			$	(20,507	)
	Total deferred tax assets	$	317,847			$	452,596
	Total deferred tax liabilities	$	(329,872	)		$	(474,204	)

Segment_Reporting_and_Business1

Segment Reporting and Business Concentrations (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Schedule of segment information	'
		As of and for the Year Ended December 31, 2013
		Projects			Products			LP&D			International			Corporate			Consolidated
														Unallocated Items
	Revenue from external customers(1)(2)	$	295,816		$	84,242		$	236,854		$	1,187,486		$	—		$	1,804,398
	Income (loss) from operations(2)(3)	21,415			11,863			65,805			30,765			(98,404		)	31,444
	Depreciation, amortization and accretion expense(4)	26,616			2,061			28,829			7,625			3,740			68,871
	Goodwill	40,236			17,951			207,990			43,331			—			309,508
	Other long-lived assets(5)	15,193			15,706			248,274			42,195			7,469			328,837
	Purchases of property, plant and equipment	80			237			13,719			201			962			15,199
	Total assets(6)	1,143,673			52,642			612,423			522,533			89,272			2,420,543
		As of and for the Year Ended December 31, 2012
		Projects			Products			LP&D			International			Corporate			Consolidated
														Unallocated Items
	Revenue from external customers(1)(2)	$	309,188		$	125,816		$	233,075		$	1,139,426		$	—		$	1,807,505
	Income (loss) from operations(2)(3)(7)	20,408			14,856			48,660			30,283			(74,300		)	39,907
	Depreciation, amortization and accretion expense(4)	30,869			1,911			34,382			7,568			4,881			79,611
	Goodwill	40,236			17,951			207,216			43,205			—			308,608
	Other long-lived assets(5)	17,598			18,840			262,826			49,275			10,269			358,808
	Purchases of property, plant and equipment	1,756			2,075			15,314			388			812			20,345
	Total assets(6)	1,434,407			63,210			641,826			378,111			137,908			2,655,462
		As of and for the Year Ended December 31, 2011
		Projects			Products			LP&D			International			Corporate			Consolidated
														Unallocated Items
	Revenue from external customers(1)(2)	$	411,828		$	49,990		$	252,659		$	1,101,037		$	—		$	1,815,514
	Income (loss) from operations(2)(3)(7)(8)	(106,366		)	3,181			(77,789		)	26,015			(60,636		)	(215,595		)
	Depreciation, amortization and accretion expense(4)	34,855			2,180			31,382			7,644			4,633			80,694
	Goodwill	40,236			17,951			208,250			39,921			—			306,358
	Other long-lived assets(5)	26,063			18,904			269,017			53,937			19,567			387,488
	Purchases of property, plant and equipment	1,200			3,840			14,470			635			3,589			23,734
	Total assets(6)	1,660,477			51,506			689,645			511,872			102,433			3,015,933
	______________________
	-1	We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.
	-2	Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and for services provided to our customers in Canada are included in our LP&D and Projects Groups.
	-3	For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.
	-4	Depreciation, amortization and accretion expenses ("DA&A") are included in cost of revenue and SG&A expenses in the accompanying consolidated statements of operations and comprehensive income (loss). DA&A expenses included in cost of revenue for the years ended December 31, 2013, 2012 and 2011, were $47.9 million, $56.3 million and $58.3 million, respectively. DA&A expenses included in SG&A for years ended December 31, 2013, 2012 and 2011, were $20.9 million, $23.3 million and $22.4 million, respectively.
	-5	Other long-lived assets include property, plant and equipment and other intangible assets.
	-6	Corporate unallocated assets relate primarily to income tax receivables, deferred tax assets, deferred financing costs, prepaid expenses, and property, plant and equipment that benefit the entire Company and c
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	'
	Our revenue and long-lived assets by geographic region were as follows (in thousands):
	As of and for the Year Ended December 31,		United			United			Other			Total
			States			Kingdom
	2013
	Revenue from external customers		$	548,188		$	1,187,486		$	68,724		$	1,804,398
	Property, plant and equipment, net		112,418			624			1,434			114,476
	2012
	Revenue from external customers		$	564,385		$	1,139,426		$	103,694		$	1,807,505
	Property, plant and equipment, net		114,770			1,108			1,866			117,744
	2011
	Revenue from external customers		$	690,172		$	1,101,037		$	24,305		$	1,815,514
	Property, plant and equipment, net		125,155			807			647			126,609

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Contractual Obligation, Fiscal Year Maturity Schedule	'
	The following table summarizes future minimum annual lease payments for all operating and capital leases and annual payments for other contractual obligations with initial or remaining lease terms greater than one year (in thousands):
	Year ending December 31,	Operating		Sublease Rental Income			Capital			Other
		Leases					Leases			Contractual
										Obligations
	2014	$	13,449	$	(1,271	)	$	1,040		$	2,500
	2015	8,391		(2,003		)	1,006			2,500
	2016	5,692		(1,388		)	918			—
	2017	4,090		(1,035		)	413			—
	2018	3,215		(822		)	159			—
	Thereafter	9,400		(3,610		)	—			—
	Future minimum lease payments	$	44,237	$	(10,129	)	3,536			$	5,000
	Less portion representing interest						(389		)
	Less current portion of capital lease obligations						(861		)
	Long-term portion of capital lease obligations						$	2,286

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Schedule of change in projected benefit obligation, plan assets and funded status pension plans obligation	'
	The following table sets forth the change in projected benefit obligation, plan assets and funded status pension plans' obligations (in thousands):
			Year Ending December 31,
			2013				2012
	Changes in projected benefit obligation:
	Projected benefit obligation at beginning of period		$	3,836,343			$	3,447,461
	Service cost		57,272				56,271
	Interest cost		156,011				159,303
	Member contributions		469				476
	Termination benefits		9,858				23,142
	Benefits paid		(160,392		)		(169,447		)
	Actuarial gain		220,480				155,815
	Foreign currency translation		91,925				163,322
	Projected benefit obligation at end of year		4,211,966				3,836,343
	Changes in plan assets:
	Fair value at beginning of period		3,875,793				3,580,382
	Actual return on plan assets		250,994				193,382
	Company contributions		47,257				85,595
	Employee contributions		469				476
	Termination benefits		8,919				17,912
	Benefits paid		(160,392		)		(169,447		)
	Foreign currency translation		85,343				167,493
	Plan assets at end of year at fair value		4,108,383				3,875,793
	Funded status at end of year		$	(103,583	)		$	39,450
	Amounts recognized in the consolidated balance sheets:
	Pension assets included in other noncurrent assets		103,563				39,773
	Pension liabilities included in other noncurrent liabilities		(111,644		)		(31,043		)
	Accumulated other comprehensive loss (pretax)		(9,712		)		(4,880		)
Schedule of estimated benefit plan payments	'
	Estimated benefit plan payments for the five years following 2013 and the subsequent five years aggregated, excluding amounts recoverable from the NDA, are as follows (in thousands):
			2014				2015			2016			2017		2018		Thereafter
	Estimated benefit plan payments		$	174,145			$	179,422		$	184,699		$	190,471	$	196,243	$	1,073,564
Schedule of net periodic postretirement benefit costs	'
	Net periodic benefit costs related to the Magnox pension plan consisted of the following (in thousands):
			Year Ending December 31,
			2013				2012			2011
	Service cost		$	57,272			$	56,271		$	56,635
	Interest cost		156,011				159,303			173,275
	Expected return on plan assets		(182,456		)		(171,983		)	(182,420		)
	Net actuarial loss		1,408				951			—
	Termination benefits		8,763				22,667			8,182
	Total net periodic benefit costs		$	40,998			$	67,209		$	55,672
Schedule of weighted average assumptions used to determine benefit obligations	'
	Weighted average assumptions used to determine benefit obligations were as follows:
			31-Dec-13			31-Dec-12
	Discount rate		4.4	%		4.3	%
	Expected rates of return on plan assets		5.2% - 5.3%			4.9% - 5.8%
	Rate of compensation increase		3.6	%		3.1	%
Schedule of target allocations and the weighted average actual allocations of plan assets	'
	The following table sets forth the target allocations and the weighted average actual allocations of plan assets:
			31-Dec-13			31-Dec-12
	Asset category:
	Equities		16.6	%		14.7	%
	Bonds		47.5	%		55.7	%
	Real Estate		5.1	%		5	%
	Other		30.8	%		24.6	%
			100	%		100	%
Summary of the pension plans' investments by level within the fair value hierarchy	'
	The following table sets forth by level within the fair value hierarchy a summary of the pension plans' investments (in thousands):
			December 31, 2013
			Total				Level 1			Level 2			Level 3
	Cash		$	73,764			$	73,764		$	—		$	—
	Fixed income securities		2,595,585				—			2,369,658			225,927
	Equity securities		1,285,341				1,148,136			137,205			—
	Real Estate		153,693				—			—			153,693
	Investments, at fair value		$	4,108,383			$	1,221,900		$	2,506,863		$	379,620
			December 31, 2012
			Total				Level 1			Level 2			Level 3
	Cash		$	5,384			$	5,384		$	—		$	—
	Fixed income securities		2,267,773				837,131			1,425,468			5,174
	Equity securities		1,108,931				1,108,931			—			—
	Real Estate		493,705				—			145,996			347,709
	Investments, at fair value		$	3,875,793			$	1,951,446		$	1,571,464		$	352,883
Schedule of changes in fair value of plan assets	'
	The following table presents the rollforward for Level 3 pension plans' assets at a fair value on a recurring basis (in thousands):
	Direct Lending Securities	December 31,
		2013
	Beginning balance	$	352,883
	Purchases and issuances	26,132
	Sales, dispositions and settlements	—
	Realized gains and losses	(1,252		)
	Change in unrealized gains and losses	1,857
	Ending balance	$	379,620

Restructuring_Tables

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Schedule of reconciliation of the beginning and ending liability balances related to the Magnox employee termination benefits	'
	The following is a reconciliation of the beginning and ending liability balances related to the Magnox employee termination benefits (in thousands):
		December 31,			December 31,
		2013			2012
	Beginning liability	$	5,695		$	32,659
	Additions	55,555			—
	Payments	(17,195		)	(27,888		)
	Effect of exchange rate	2,673			924
	Ending liability	46,728			5,695
	Less current portion	(23,055		)	—
	Long term portion	$	23,673		$	5,695

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]	'
Changes in the accumulated balances for each component of other comprehensive income (loss)	'
	The following table presents the changes in the accumulated balances for each component of other comprehensive income (loss):
	(in thousands)	Foreign			Change in			Accumulated
		currency			unrecognized			other
		translation			actuarial loss			comprehensive
		items						loss
	Beginning Balance at December 31, 2012	$	(17,076	)	$	(4,880	)	$	(21,956	)
	Current period other comprehensive income (loss)	3,911			(4,832		)	(921		)
	Ending balance at December 31, 2013	$	(13,165	)	$	(9,712	)	$	(22,877	)

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of selected quarterly financial data (unaudited)	'
			2013 Quarters Ended
			March 31			June 30			September 30			December 31
			(in thousands, except for per share data)
	Statement of operations data:
	Revenue		$	526,208		$	411,038		$	392,474		$	474,678
	Gross profit(1)		46,430			47,397			36,485			67,128
	Income (loss) from operations(1)(2)		14,875			(22,098		)	10,239			28,428
	Net income (loss) attributable to EnergySolutions(1)(2)		(8,200		)	(57,230		)	(4,855		)	15,632
	Net income (loss) per share data (3)
	Basic		$	(0.09	)	N/A			N/A			N/A
	Diluted		(0.09		)	N/A			N/A			N/A
	Number of shares used in per share calculations:
	Basic		90,360			N/A			N/A			N/A
	Diluted		90,360			N/A			N/A			N/A
	_______________________________________________________________________________
	-1	The second quarter of 2013, includes $32.6 million of Merger Transaction related expenses comprised of employee incentive compensation and related payroll taxes and professional fees.
	-2	During 2013, we paid $8.0 million in lead arranger banker fees in connection with amendments made to our senior secured credit facility to obtain consent from our lender to complete the Merger Transaction.
	-3	The Company's common stock ceased to be traded on the New York Stock Exchange after close of market on May 24, 2013, and continues its operations as a privately-held company.
			2012 Quarters Ended
			March 31			June 30			September 30			December 31
			(in thousands, except for per share data)
	Statement of operations data:
	Revenue		$	490,692		$	392,621		$	444,157		$	480,035
	Gross profit(1)		31,680			35,903			46,157			56,986
	Income (loss) from operations(1)		(1,252		)	4,089			18,664			18,406
	Net income (loss) attributable to EnergySolutions(2)		(669		)	5,444			10,052			(10,845		)
	Net income (loss) per share data:
	Basic		$	(0.01	)	$	0.06		$	0.11		$	(0.12	)
	Diluted		(0.01		)	0.06			0.11			(0.12		)
	Number of shares used in per share calculations:
	Basic		89,066			89,249			89,994			90,253
	Diluted		89,066			89,249			89,994			90,256
	_______________________________________________________________________________
	-1	Includes charges for the following items: $5.6 million reversal of incentive fee related to our Salt Waste project recorded during the first quarter of 2012, $15.4 million in restructuring costs and $8.7 million favorable ARO cost estimate adjustment related to the Zion Station project, both recorded during the fourth quarter of 2012.
	-2	Includes $18.0 million in income tax expense resulting from an increase in the valuation allowance against certain U.S. and foreign deferred tax assets with no offsetting benefit for losses in the U.S. and certain other entities in the U.K. due to the valuation allowance positions.

Guarantor_and_NonGuarantor_Fin1

Guarantor and Non-Guarantor Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantor and Non-Guarantor Financial Information	'
Schedule of Condensed Consolidating Statement of Operations	'
	ing.
	CONSOLIDATING STATEMENT OF OPERATIONS
	For The Year ended December 31, 2013
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Revenue	$	—			$	92,188			$	386,838			$	1,385,938			$	(60,566	)		$	1,804,398
	Cost of revenue	—				(34,534		)		(313,263		)		(1,319,727		)		60,566				(1,606,958		)
	Gross profit	—				57,654				73,575				66,211				—				197,440
	Selling, general and administrative expenses	—				(121,617		)		(27,405		)		(21,439		)		—				(170,461		)
	Equity in income of unconsolidated joint ventures	—				—				4,465				—				—				4,465
	Operating income (loss)	—				(63,963		)		50,635				44,772				—				31,444
	Interest expense	—				(61,640		)		(5		)		(15,129		)		—				(76,774		)
	Income (loss) from subsidiaries	(54,619		)		78,588				—				—				(23,969		)		—
	Other, net	—				(7,604		)		156				5,882				—				(1,566		)
	Income (loss) before income taxes	(54,619		)		(54,619		)		50,786				35,525				(23,969		)		(46,896		)
	Provision for income taxes	(34		)		—				—				(7,735		)		—				(7,769		)
	Net income (loss)	(54,653		)		(54,619		)		50,786				27,790				(23,969		)		(54,665		)
	Less: net income attributable to noncontrolling interests	—				—				—				12				—				12
	Net income (loss) attributable to EnergySolutions	$	(54,653	)		$	(54,619	)		$	50,786			$	27,802			$	(23,969	)		$	(54,653	)
	Other comprehensive income (loss):
	Net income (loss)	$	(54,653	)		$	(54,619	)		$	50,786			$	27,790			$	(23,969	)		$	(54,665	)
	Foreign currency translation adjustments, net of taxes	—				—				—				3,911				—				3,911
	Change in unrecognized actuarial loss	—				—				—				(4,832		)		—				(4,832		)
	Other comprehensive income (loss)	(54,653		)		(54,619		)		50,786				26,869				(23,969		)		(55,586		)
	Less: net income attributable to noncontrolling interests	—				—				—				12				—				12
	Comprehensive income (loss) attributable to EnergySolutions	$	(54,653	)		$	(54,619	)		$	50,786			$	26,881			$	(23,969	)		$	(55,574	)
	CONSOLIDATING STATEMENT OF OPERATIONS
	For The Year Ended December 31, 2012
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Revenue	$	—			$	75,143			$	453,709			$	1,331,675			$	(53,022	)		$	1,807,505
	Cost of revenue	—				(40,716		)		(384,463		)		(1,264,622		)		53,022				(1,636,779		)
	Gross profit	—				34,427				69,246				67,053				—				170,726
	Selling, general and administrative expenses	—				(84,430		)		(33,297		)		(20,484		)		—				(138,211		)
	Equity in income of unconsolidated joint ventures	—				—				7,392				—				—				7,392
	Operating income (loss)	—				(50,003		)		43,341				46,569				—				39,907
	Interest expense	—				(57,770		)		—				(13,441		)		—				(71,211		)
	Income (loss) from subsidiaries	3,993				116,526				—				—				(120,519		)		—
	Other, net	—				(4,760		)		(1,256		)		59,208				—				53,192
	Income (loss) before income taxes	3,993				3,993				42,085				92,336				(120,519		)		21,888
	Benefit from (provision for) income taxes	(11		)		—				—				(17,948		)		—				(17,959		)
	Net income (loss)	3,982				3,993				42,085				74,388				(120,519		)		3,929
	Less: net income attributable to noncontrolling interests	—				—				—				53				—				53
	Net income (loss) attributable to EnergySolutions	$	3,982			$	3,993			$	42,085			$	74,441			$	(120,519	)		$	3,982
	Other comprehensive income (loss):
	Net income (loss)	$	3,982			$	3,993			$	42,085			$	74,388			$	(120,519	)		$	3,929
	Foreign currency translation adjustments, net of taxes	—				6,863				—				6,863				(6,863		)		6,863
	Change in unrecognized actuarial gain	—				(450		)		—				(450		)		450				(450		)
	Other comprehensive income (loss)	3,982				10,406				42,085				80,801				(126,932		)		10,342
	Less: net income attributable to noncontrolling interests	—				—				—				53				—				53
	Comprehensive income (loss) attributable to EnergySolutions	$	3,982			$	10,406			$	42,085			$	80,854			$	(126,932	)		$	10,395
	CONSOLIDATING STATEMENT OF OPERATIONS
	For The Year Ended December 31, 2011
	(in thousands)
			Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
			Solutions,				Solutions				Subsidiaries				Guarantor
			Inc.				LLC								Subsidiaries
	Revenue		$	—			$	112,675			$	429,098			$	1,323,993			$	(50,252	)		$	1,815,514
	Cost of revenue		—				(59,385		)		(381,240		)		(1,345,453		)		50,252				(1,735,826		)
Gross profit		—				53,290				47,858				(21,460		)		—				79,688
Selling, general and administrative expenses		—				(70,087		)		(25,485		)		(36,814		)		—				(132,386		)
Impairment of goodwill		—				(108,600		)		(65,400		)		—				—				(174,000		)
Equity in income of unconsolidated joint ventures		—				—				11,103				—				—				11,103
Operating income		—				(125,397		)		(31,924		)		(58,274		)		—				(215,595		)
Interest expense		—				(59,747		)		—				(13,667		)		—				(73,414		)
Income from subsidiaries		(256,723		)		(75,613		)		—				—				332,336				—
Other, net		—				4,034				216				53,965				—				58,215
Income (loss) before income tax		(256,723		)		(256,723		)		(31,708		)		(17,976		)		332,336				(230,794		)
Provision (benefit) for income taxes		60,542				—				—				(23,397		)		—				37,145
Net income (loss)		(196,181		)		(256,723		)		(31,708		)		(41,373		)		332,336				(193,649		)
Net income attributable to noncontrolling interests		—				—				—				(2,532		)		—				(2,532		)
Net income (loss) attributable to EnergySolutions		$	(196,181	)		$	(256,723	)		$	(31,708	)		$	(43,905	)		$	332,336			$	(196,181	)
Other comprehensive income (loss):
Net income (loss)		$	(196,181	)		$	(256,723	)		$	(31,708	)		$	(41,373	)		$	332,336			$	(193,649	)
Foreign currency translation adjustments, net of taxes		—				147				—				147				(147		)		147
Change in unrecognized actuarial gain		—				(3,005		)		—				(3,005		)		3,005				(3,005		)
Other comprehensive income (loss)		(196,181		)		(259,581		)		(31,708		)		(44,231		)		335,194				(196,507		)
Less: net loss attributable to noncontrolling interests		—				—				—				(2,532		)		—				(2,532		)
Comprehensive income (loss) attributable to EnergySolutions		$	(196,181	)		$	(259,581	)		$	(31,708	)		$	(46,763	)		$	335,194			$	(199,039	)
Schedule of Condensed Consolidating Balance Sheet	'
	CONSOLIDATING BALANCE SHEET
	As of December 31, 2013
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Assets
	Cash and cash equivalents	$	—			$	33,556			$	872			$	49,785			$	—			$	84,213
	Accounts receivable, net of allowance for doubtful accounts	—				13,793				47,034				229,138				(2,527		)		287,438
	Costs and estimated earnings in excess of billings on uncompleted contracts	—				9,884				41,993				36,820				(2,732		)		85,965
	Nuclear decommissioning trust fund investments, current portion	—				—				—				112,475				—				112,475
	Deferred costs, current portion	—				—				333				91,508				—				91,841
	Other current assets	—				$	6,548			4,402				4,918				—				15,868
	Total current assets	—				63,781				94,634				524,644				(5,259		)		677,800
	Property, plant and equipment, net	—				52,149				60,269				2,058				—				114,476
	Goodwill	—				29,764				223,506				56,238				—				309,508
	Intangibles, net	—				151,580				21,210				41,571				—				214,361
	Restricted cash	—				89,537				3,821				200,538				—				293,896
	Nuclear decommissioning trust fund	—				—				—				330,442				—				330,442
	Deferred Income Taxes	29,707				—				—				—				—				29,707
	Long-term deferred costs less current portion	—				—				—				270,039				—				270,039
	Investment in subsidiaries	(65,095		)		693,474				—				—				(628,379		)		—
	Intercompany receivable	333,300				—				193,465				8,997				(535,762		)		—
	Other long term assets	—				11,275				17,955				151,084				—				180,314
	Total Assets	$	297,912			$	1,091,560			$	614,860			$	1,585,611			$	(1,169,400	)		$	2,420,543
	Liabilities and Equity
	Accounts payable	$	—			$	5,198			$	16,027			$	124,632			$	—			$	145,857
	Accrued expenses and other current liabilities	477				56,788				35,075				116,306				(469		)		208,177
	Unearned revenue, current portion	—				2,229				23,296				92,515				425				118,465
	Facility and equipment decontamination and decommissioning liabilities, current portion	—				—				—				98,175				—				98,175
	Other current liabilities	19,261				65,000				—				11,102				—				95,363
	Intercompany payable	—				—				5,215				22,626				(27,841		)		—
	Total current liabilities	19,738				129,215				79,613				465,356				(27,885		)		666,037
	Intercompany loan payable	—				513,136				—				—				(513,136		)		—
	Long-term debt, less current portion	—				469,260				—				197,554				—				666,814
	Facility and equipment decontamination and decommissioning liabilities, current portion	—				30,375				36,981				311,033				—				378,389
	Unearned revenue, less current portion	—				—				—				272,940				—				272,940
	Other liabilities, net	10,447				14,669				1,944				141,088				—				168,148
	Equity	267,727				(65,095		)		496,322				197,152				(628,379		)		267,727
	Noncontrolling interests	—				—				—				488				—				488
	Total Liabilities and Equity	$	297,912			$	1,091,560			$	614,860			$	1,585,611			$	(1,169,400	)		$	2,420,543
	CONSOLIDATING BALANCE SHEET
	As of December 31, 2012
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Assets
	Total current assets	$	6,423			$	128,479			$	115,603			$	545,483			$	(1,453	)		$	794,535
	Property, plant and equipment, net	—				60,657				54,112				2,975				—				117,744
	Goodwill	—				29,765				223,506				55,337				—				308,608
	Intangibles, net	—				160,198				31,186				48,167				—				239,551
	Restricted cash	—				110,471				5,867				200,416				—				316,754
	Nuclear decommissioning trust fund	—				—				—				445,989				—				445,989
	Long-term deferred costs less current portion	—				—				—				360,185				—				360,185
	Investment in subsidiaries	(9,554		)		616,038				—				—				(606,484		)		—
	Intercompany receivable	303,550				—				108,032				1,302				(412,884		)		—
	Other long term assets	—				10,884				16,450				44,762				—				72,096
	Total Assets	$	300,419			$	1,116,492			$	554,756			$	1,704,616			$	(1,020,821	)		$	2,655,462
	Liabilities and Stockholders’ Equity
	Intercompany loan payable	$	—			$	401,015			$	—			$	—			$	(401,015	)		$	—
	Intercompany payable	—				—				1,441				11,869				(13,310		)		—
	Total current liabilities	—				88,815				67,198				488,779				(12		)		644,780
Long-term debt, less current portion	—				601,836				—				196,741				—				798,577
Facility and equipment decontamination and decommissioning liabilities, current portion	—				31,206				39,358				414,883				—				485,447
Unearned revenue, less current portion	—				—				—				366,710				—				366,710
Other liabilities, net	—				3,174				1,051				54,804				—				59,029
Stockholders’ equity	300,419				(9,554		)		445,708				170,330				(606,484		)		300,419
Noncontrolling interests	—				—				—				500				—				500
Total Liabilities and Equity	$	300,419			$	1,116,492			$	554,756			$	1,704,616			$	(1,020,821	)		$	2,655,462
Schedule of Condensed Cash Flow Statement	'
	CONSOLIDATING STATEMENT OF CASH FLOW
	For The Year Ended December 31, 2013
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Cash flow from operating activities
	Net cash provided by (used in) operating activities	$	(43,276	)		$	(14,779	)		$	106,447			$	10,399			$	(32,651	)		$	26,140
	Cash flow from investing activities
	Purchase of investments in nuclear decommissioning trust fund	—				—				—				(884,481		)		—				(884,481		)
	Proceeds from sales of nuclear decommissioning trust fund investments	—				—				—				888,916				—				888,916
	Purchases of property, plant and equipment	—				(581		)		(14,305		)		(313		)		—				(15,199		)
	Proceeds from disposition of property, plant and equipment	—				43				—				6				—				49
	Net cash provided by (used in) investing activities	—				(538		)		(14,305		)		4,128				—				(10,715		)
	Cash flows from financing activities
	Intercompany loans	(18,898		)		102,782				(94,641		)		—				10,757				—
	Investment in subsidiary	55,541				(77,435		)		—				—				21,894				—
	Repayments of long term debt	—				(87,000		)		—				—				—				(87,000		)
	Restricted cash held as collateral of letter of credit obligations	—				21,000				—				—				—				21,000
	Proceeds from revolver credit facility	—				5,000				—				—				—				5,000
	Payments on revolver credit facility	—				(5,000		)		—				—				—				(5,000		)
	Debt financing fees	—				(2,710		)		—				(1,825		)		—				(4,535		)
	Capital contributions	14,407				—				—				—				—				14,407
	Minimum tax withholding on restricted stock awards	(432		)		—				—				—				—				(432		)
	Repurchase of common stock	(7,342		)		—				—				—				—				(7,342		)
	Repayments of capital lease obligations	—				(844		)		—				—				—				(844		)
	Net cash provided by (used in) financing activities	43,276				(44,207		)		(94,641		)		(1,825		)		32,651				(64,746		)
	Effect of exchange rate on cash	—				—				—				(657		)		—				(657		)
	Net increase (decrease) in cash and cash equivalents	—				(59,524		)		(2,499		)		12,045				—				(49,978		)
	Cash and cash equivalents, beginning of period	—				93,080				3,371				37,740				—				134,191
	Cash and cash equivalents, end of period	$	—			$	33,556			$	872			$	49,785			$	—			$	84,213
	CONSOLIDATING STATEMENT OF CASH FLOW
	For The Year Ended December 31, 2012
	(in thousands)
		Energy				Energy				Guarantor				Non-				Eliminations				Consolidated
		Solutions,				Solutions,				Subsidiaries				Guarantor
		Inc.				LLC								Subsidiaries
	Cash flow from operating activities
	Net cash provided by (used in) operating activities	$	14,994			$	56,441			$	104,932			$	(9,636	)		$	(99,095	)		$	67,636
	Cash flow from investing activities
	Purchase of investments in nuclear decommissioning trust fund	—				—				—				(877,723		)		—				(877,723		)
	Proceeds from sales of nuclear decommissioning trust fund investments	—				—				—				881,672				—				881,672
	Purchases of property, plant and equipment	—				(5,428		)		(13,084		)		(1,833		)		—				(20,345		)
	Purchases of intangible assets	—				—				(763		)		—				—				(763		)
	Proceeds from disposition of property, plant and equipment	—				—				5,336				—				—				5,336
	Net cash provided by (used in) investing activities	—				(5,428		)		(8,511		)		2,116				—				(11,823		)
	Cash flows from financing activities
	Intercompany loan receivable	(5,963		)		31,078				(86,274		)		—				61,159				—
	Intercompany loan payable	—				103,430				—				—				(103,430		)		—
	Investment in subsidiary	(10,408		)		(92,481		)		(6,776		)		(31,701		)		141,366				—
	Dividend: minority interest	—				—				—				(158		)		—				(158		)
	Proceeds from issuance of common stock	1,497				—				—				—				—				1,497
	Minimum tax withholding on restricted stock awards	(120		)		—				—				—				—				(120		)
	Repayments of capital lease obligations	—				(654		)		—				—				—				(654		)
	Net cash provided by (used in) financing activities	(14,994		)		41,373				(93,050		)		(31,859		)		99,095				565
	Effect of exchange rate on cash	—				—				—				600				—				600
	Net increase (decrease) in cash and cash equivalents	—				92,386				3,371				(38,779		)		—				56,978
	Cash and cash equivalents, beginning of period	—				694				—				76,519				—				77,213
	Cash and cash equivalents, end of period	$	—			$	93,080			$	3,371			$	37,740			$	—			$	134,191

Description_of_Business_Detail

Description of Business (Details) (USD $)

3 Months Ended

12 Months Ended

12 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, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2014

group

Facilities and equipment ARO—Clive, UT

Exelon Generation Company LLC

Facilities and equipment ARO—Clive, UT

Tennessee

Barnwell, South Carolina

Brampton, Canada

Letter of Credit [Member]

International

International

International

Nuclear Decommissioning Authority [Member]

MMcf

facility

facility

facility

facility

Facilities and equipment ARO—Zion Station

Description of Business

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

1

4

2

1

'

'

'

'

'

Number of major operating groups

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity under credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$200,000,000

'

'

'

'

Percentage of Pledged Interest

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

Irrevocable Easement of Disposal Capacity Granted for Approving License Transfer

'

'

'

'

'

'

'

'

'

'

'

7,500,000

'

'

'

'

'

'

'

'

'

'

Revenue

474,678,000

392,474,000

411,038,000

526,208,000

480,035,000

444,157,000

392,621,000

490,692,000

1,804,398,000

[1],[2]

1,807,505,000

[1],[2]

1,815,514,000

[1],[2]

'

5,100,000

'

'

'

'

'

1,187,486,000

[1],[2]

1,139,426,000

[1],[2]

1,101,037,000

[1],[2]

'

Nuclear decommissioning trust fund investments

330,442,000

'

'

'

445,989,000

'

'

'

330,442,000

445,989,000

'

'

801,400,000

'

'

'

'

'

'

'

'

'

Unrealized Gain (Loss) on Investments

'

'

'

'

'

'

'

'

10,615,000

62,817,000

58,513,000

'

171,700,000

'

'

'

'

'

'

'

'

'

Deferred Tax Liabilities, Net

'

'

'

'

'

'

'

'

'

'

'

'

34,300,000

'

'

'

'

'

'

'

'

'

Deferred Revenue, Additions

'

'

'

'

'

'

'

'

'

772,200,000

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Costs Increase, Acquisition of Future Revenue Stream

'

'

'

'

'

'

'

'

'

767,100,000

'

'

'

'

'

'

'

'

'

'

'

'

Income (loss) from operations

28,428,000

10,239,000

-22,098,000

14,875,000

18,406,000

18,664,000

4,089,000

-1,252,000

31,444,000

[2],[3]

39,907,000

[2],[3],[4]

-215,595,000

[2],[3],[4],[5]

'

'

'

'

'

'

'

30,765,000

[2],[3]

30,283,000

[2],[3],[4]

26,015,000

[2],[3],[4],[5]

'

Equity interest percentage of ownership

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40.00%

Intangible Assets, Net (Including Goodwill)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$85,000,000

'

'

'

[1]

We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.

[2]

Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and

[3]

For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.

[4]

Included in income (loss) from operations from our Projects group for the years ended December 31, 2012 and 2011, is an $8.7 million non-cash favorable ARO adjustment and a $94.9 million non cash unfavorable ARO estimated cost adjustment, respectively, related to the Zion Station project, for which no corresponding revenue was recognized.

[5]

For the year ended December 31, 2011, included in income (loss) from operations from our Projects and LP&D groups, is a goodwill impairment charge of $35.0 million and $139.0 million, respectively.

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2013
	venture
Summary of Significant Accounting Policies	'	'
Number of minority-owned joint ventures consolidated	1	'
Accounts Receivable	'	'
Allowance for doubtful accounts	$1.80	$4.80
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts, Unearned Revenue and Retainage	'	'
Outstanding rate reserve receivables	6.9	8.1
Current portion of outstanding rate reserve liabilities included in accrued expenses and other current liabilities	1.4	0.8
Outstanding rate reserve liabilities	1.9	2.5
Retainage balances	4.4	6.5
Current portion of retainage balances	$1.30	$2.70

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2013
Buildings, building improvements and land improvements | Minimum	'
Property, Plant and Equipment	'
Estimated useful lives	'5 years
Buildings, building improvements and land improvements | Maximum	'
Property, Plant and Equipment	'
Estimated useful lives	'31 years
Computer hardware and software | Minimum	'
Property, Plant and Equipment	'
Estimated useful lives	'1 year
Computer hardware and software | Maximum	'
Property, Plant and Equipment	'
Estimated useful lives	'7 years
Furniture and fixtures | Minimum	'
Property, Plant and Equipment	'
Estimated useful lives	'5 years
Furniture and fixtures | Maximum	'
Property, Plant and Equipment	'
Estimated useful lives	'7 years
Machinery and equipment | Minimum	'
Property, Plant and Equipment	'
Estimated useful lives	'5 years
Machinery and equipment | Maximum	'
Property, Plant and Equipment	'
Estimated useful lives	'20 years
Trucks and vehicles | Minimum	'
Property, Plant and Equipment	'
Estimated useful lives	'5 years
Trucks and vehicles | Maximum	'
Property, Plant and Equipment	'
Estimated useful lives	'15 years

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Details 3) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Facility and Equipment Decontamination and Decommissioning Liabilities	'	'	'
Period for maintenance and monitoring of landfill site subsequent to landfill closure	'100 years	'	'
Revenue Recognition	'	'	'
Revenue calculated using a cost-to-cost approach, including revenue under Zion Station project	$149.30	$163.50	$175
Provision for losses	2.2	0.9	0.2
Advertising Costs	'	'	'
Advertising expenses	$3.40	$4.20	$4.10

Business_Combinations_Details

Business Combinations (Details) (USD $)

12 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

24-May-13

Dec. 31, 2013

24-May-13

24-May-13

24-May-13

24-May-13

24-May-13

24-May-13

24-May-13

Mar. 04, 2014

Dec. 31, 2013

Mar. 04, 2014

Senior notes due 2018

Energy Solutions Inc.

Energy Solutions Inc.

Energy Solutions Inc.

Energy Solutions Inc.

Rockwell Holdco, Inc

Rockwell Holdco, Inc

Rockwell Holdco, Inc

Subsequent Event [Member]

SempraSafe, LLC

SempraSafe, LLC

Common Stock

Employee incentives and related payroll taxes

Professional, Legal and Consulting Fees [Member]

Energy Solutions Inc.

Energy Solutions Inc.

Energy Solutions Inc.

Studsvik, Inc.

Subsequent Event [Member]

Amount paid on behalf of acquiree

Amount capitalized as debt issuance cost

Studsvik, Inc.

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion price of shares (in dollars per share)

'

'

'

'

'

'

'

'

'

$4.15

'

'

'

'

'

Interest rate on senior notes

'

'

'

'

10.75%

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized

100

1,000,000,000

'

1,000,000,000

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares authorized

0

'

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

Acquisition purchase price

$7,342,000

$0

$0

'

'

$383,900,000

'

'

'

'

'

'

'

'

'

Stock repurchased during period (in shares)

'

'

'

'

'

'

1,800,000

'

'

'

'

'

'

'

'

Stock repurchased during period

'

'

'

'

'

'

7,300,000

'

'

'

'

'

'

'

'

Merger transaction related costs paid

'

'

'

'

'

'

'

'

'

'

10,900,000

3,100,000

'

'

'

Merger transaction related costs expensed

'

'

'

'

'

32,600,000

'

21,000,000

11,600,000

'

'

'

'

'

'

Equity interest percentage of ownership

'

'

'

'

'

'

'

'

'

'

'

'

'

49.00%

49.00%

Aggregate purchase price

'

'

'

'

'

'

'

'

'

'

'

'

$23,100,000

'

'

Trust_Fund_Investments_Details

Trust Fund Investments (Details) (USD $)

12 Months Ended

3 Months Ended

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

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

NDT fund

Minimum

Corporate debt securities

Corporate debt securities

Equity securities

Equity securities

Direct lending securities

Direct lending securities

Debt securities issued by states of the U.S.

Debt securities issued by states of the U.S.

Cash and cash equivalents

Cash and cash equivalents

Commingled funds

Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies

Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies

Estimated fair value

Estimated fair value

NDT fund

Trust Fund Investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Collateral Levels as Percentage of Market Value of Borrowed Securities for Collateral Denominated in US Currency

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

102.00%

Collateral Levels as Percentage of Market Value of Borrowed Securities for Collateral Denominated in Foreign Currency

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

105.00%

Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Receivables for securities sold

'

'

'

$4,568,000

$7,422,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,568,000

$7,422,000

'

Investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investments, amortized cost

'

'

'

425,034,000

557,851,000

'

201,377,000

223,662,000

400,000

10,117,000

134,161,000

98,138,000

23,725,000

31,306,000

29,686,000

23,686,000

4,017,000

35,685,000

166,925,000

'

'

'

Investments, gross unrealized gains

'

'

'

20,377,000

36,460,000

'

8,050,000

17,940,000

13,000

4,249,000

11,476,000

6,026,000

761,000

3,806,000

'

'

527,000

77,000

3,912,000

'

'

'

Investments, gross unrealized losses

'

'

'

-7,062,000

-3,237,000

'

-2,352,000

-575,000

0

-61,000

-3,387,000

-1,721,000

-468,000

'

'

'

'

-855,000

-880,000

'

'

'

Investments, estimated fair value

'

'

'

438,349,000

591,074,000

'

207,075,000

241,027,000

413,000

14,305,000

142,250,000

102,443,000

24,018,000

35,112,000

29,686,000

23,686,000

4,544,000

34,907,000

169,957,000

'

'

'

Net assets held by the NDT fund, amortized cost

'

'

'

429,602,000

565,273,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net assets held by the NDT fund, gross unrealized gains

'

'

'

20,377,000

36,460,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net assets held by the NDT fund, gross unrealized losses

'

'

'

-7,062,000

-3,237,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net assets held by the NDT fund

'

'

'

442,917,000

598,496,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Less: current portion

-112,475,000

-152,507,000

'

-112,475,000

-152,507,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Nuclear decommissioning trust fund investments

330,442,000

445,989,000

'

330,442,000

445,989,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional disclosures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Nuclear decommissioning trust fund

161,558,000

158,352,000

161,504,000

161,600,000

158,400,000

161,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for Brokerage Fees

'

'

'

4,400,000

3,900,000

4,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized (losses) gains resulting from adjustments to the fair value of the NDT fund investments

'

'

'

-19,800,000

11,700,000

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Realized gains related to sales of investments, dividends and interest payments received from investments held by the NDT fund

'

'

'

$30,400,000

$51,100,000

$55,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair market value | Revolving credit facility	'	'
Fair market value and carrying value	'	'
Debt	$444.40	$508.60
Fair market value | Senior notes	'	'
Fair market value and carrying value	'	'
Debt	320.2	283.5
Carrying value | Revolving credit facility	'	'
Fair market value and carrying value	'	'
Debt	440	527
Carrying value | Senior notes	'	'
Fair market value and carrying value	'	'
Debt	$300	$300

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 2) (NDT fund, USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'		'
Receivables for securities sold	$4,568		$7,422
Investments	438,349		591,074
Net assets held by the NDT fund	442,917		598,496
Cash and cash equivalents	'		'
Assets	'		'
Investments	29,686		23,686
Equity securities	'		'
Assets	'		'
Investments	413		14,305
Direct lending securities	'		'
Assets	'		'
Investments	142,250		102,443
Total Investments at Fair Value	'		'
Assets	'		'
Receivables for securities sold	4,568		7,422
Investments	438,349		591,074
Net assets held by the NDT fund	442,917		598,496
Total Investments at Fair Value | Cash and cash equivalents	'		'
Assets	'		'
Investments	29,686		23,686
Total Investments at Fair Value | Fixed income securities	'		'
Assets	'		'
Investments	266,000	[1]	446,096	[1]
Total Investments at Fair Value | Equity securities	'		'
Assets	'		'
Investments	413	[2]	14,305	[2]
Total Investments at Fair Value | Direct lending securities	'		'
Assets	'		'
Investments	142,250	[3]	102,443	[3]
Total Investments at Fair Value | Unit of participation	'		'
Assets	'		'
Investments	'		4,544	[4]
Quoted Prices in Active Markets for Identical Assets Level 1	'		'
Assets	'		'
Receivables for securities sold	4,568		7,422
Investments	65,006		163,596
Net assets held by the NDT fund	69,574		171,018
Quoted Prices in Active Markets for Identical Assets Level 1 | Cash and cash equivalents	'		'
Assets	'		'
Investments	29,686		23,686
Quoted Prices in Active Markets for Identical Assets Level 1 | Fixed income securities	'		'
Assets	'		'
Investments	34,907	[1]	125,605	[1]
Quoted Prices in Active Markets for Identical Assets Level 1 | Equity securities	'		'
Assets	'		'
Investments	413	[2]	14,305	[2]
Significant Other Observable Inputs Level 2	'		'
Assets	'		'
Investments	231,093		325,035
Net assets held by the NDT fund	231,093		325,035
Significant Other Observable Inputs Level 2 | Fixed income securities	'		'
Assets	'		'
Investments	231,093	[1]	320,491	[1]
Significant Other Observable Inputs Level 2 | Unit of participation	'		'
Assets	'		'
Investments	'		4,544	[4]
Significant Unobservable Inputs Level 3	'		'
Assets	'		'
Investments	142,250		102,443
Net assets held by the NDT fund	142,250		102,443
Significant Unobservable Inputs Level 3 | Direct lending securities	'		'
Assets	'		'
Investments	$142,250	[3]	$102,443	[3]
[1]	For fixed income securities, multiple prices from pricing services are obtained from pricing vendors whenever possible, which enables cross- provider validations in addition to checks for unusual daily movements. A primary price source is identified based on asset type, class or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary price source of a given security if the portfolio managers challenge an assigned price and the trustee determines that another price source is considered to be preferable. U.S. Treasury securities are categorized as Level 1 because they trade in a highly liquid and transparent market. Investments with maturities of three months or less when purchased, including certain short-term fixed income securities, are considered cash equivalents and are also categorized as Level 1. The fair values of fixed income securities, excluding U.S. Treasury securities, are based on evaluated prices that reflect observable market information, such as actual trade information or similar securities, adjusted for observable differences and are categorized in Level 2.
[2]	With respect to individually held equity securities, the trustee obtains prices from pricing services, whose prices are obtained from direct feeds from market exchanges. The fair values of equity securities held directly by the trust fund are based on quoted prices in active markets and are categorized in Level 1. Equity securities held individually are primarily traded on the New York Stock Exchange and NASDAQ Global Select Market, which contain only actively traded securities due to the volume trading requirements imposed by these national securities exchanges.
[3]	Direct lending securities are investments in managed funds that invest in private companies for long-term capital appreciation. The fair value of these securities is determined using either an enterprise value model or a bond valuation model. The enterprise value model develops valuation estimates based on valuations of comparable public companies, recent sales of private and public companies, discounting the forecasted cash flows of the portfolio company, estimating the liquidation or collateral value of the portfolio company or its assets, considering offers from third parties to buy the portfolio company, its historical and projected financial results, as well as other factors that may impact value. Significant judgment is required in the applications of discounts or premiums applied to the prices of comparable companies for factors such as size, marketability and relative performance. Under the bond valuation model, expected future cash flows are discounted using a discount rate. The discount rate is composed of a market based rate for similar credits in the public market and an internal credit rate based on the underlying risk of the credit. Investments in direct lending funds are categorized as Level 3 because the fair value of these securities is based largely on inputs that are unobservable and also utilize complex valuation models. Investments in direct lending securities typically cannot be redeemed until maturity of the term loan.Management determines the value of Level 3 investments by considering third party valuations and have concluded that quantitative information about significant unobservable inputs used in valuing these investments is not reasonably available. This includes information regarding the sensitivity of the fair values to changes in the unobservable inputs. We obtain annual valuations from the fund managers and gain an understanding of the inputs and assumptions used in preparing the valuations. We also conclude on the reasonableness of the fair value of these investments. We obtain quarterly reports from the fund managers and review for consistency and reasonableness with regards to the valuations of these investments that were analyzed at the most recent year-end.
[4]	Units of participation, which are similar to mutual funds, are maintained by investment companies and hold certain investments in accordance with stated fund objectives. The fair values of short-term commingled funds held within the trust funds, which generally hold short-term fixed income securities and are not subject to restrictions regarding the purchase or sale of shares, are derived from observable prices. Units of participation are categorized as Level 2 because the fair value of these securities is based primarily on observable prices of the underlying securities

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details 3) (Direct lending securities, NDT fund, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Direct lending securities | NDT fund	'	'
Rollforward for Level 3 assets and liabilities measured at fair value on a recurring basis	'	'
Beginning balance	$102,443	$61,998
Purchases and issuances	76,505	82,285
Sales, dispositions and settlements	-42,167	-39,706
Realized gains and losses	1,685	-2,940
Change in unrealized gains and losses	3,784	806
Ending balance	$142,250	$102,443

Joint_Ventures_Details

Joint Ventures (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	group
Equity Method Investments and Joint Ventures [Abstract]	'	'	'
Number of groups into which joint ventures are classified	2	'	'
Joint Ventures	'	'	'
Net income attributable to EnergySolutions	$4,465,000	$7,392,000	$11,103,000
Unconsolidated joint ventures	'	'	'
Joint Ventures	'	'	'
Current assets	55,229,000	49,979,000	'
Current liabilities	30,606,000	25,127,000	'
Revenue	133,891,000	153,692,000	158,729,000
Gross profit	14,576,000	20,547,000	31,940,000
Net income	13,571,000	20,001,000	31,324,000
Net income attributable to EnergySolutions	4,465,000	7,392,000	11,103,000
Investments in unconsolidated joint ventures balances	6,100,000	6,400,000	'
Proceeds in cash dividend distributions from unconsolidated joint ventures	$4,800,000	$7,500,000	$12,100,000
Global Threat Reduction Solutions, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	49.00%	'	'
LATA/Parallax Portsmouth, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	49.00%	'	'
SempraSafe, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	49.00%	'	'
TPMC EnergySolutions Environmental Services, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	49.00%	'	'
Washington River Protection Solutions, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	40.00%	'	'
Weskem, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	27.60%	'	'
Idaho Treatment Group, LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	15.00%	'	'
West Valley Environmental Services LLC	'	'	'
Joint Ventures	'	'	'
Equity interest percentage of ownership	10.00%	'	'

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	$306,721,000	$297,668,000	'
Less accumulated depreciation and amortization	-192,245,000	-179,924,000	'
Property, Plant and Equipment, net	114,476,000	117,744,000	126,609,000
Enterprise resource planning system (Oracle EBS R12) written off	3,300,000	'	'
Depreciation expense	16,800,000	23,700,000	22,300,000
Property, plant and equipment acquired under capital leases, gross	8,005,000	6,950,000	'
Less accumulated amortization	-4,904,000	-4,439,000	'
Property, plant and equipment acquired under capital leases, net	3,101,000	2,511,000	'
Capital leases entered during the period	1,300,000	200,000	'
Land and land improvements	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	29,203,000	28,679,000	'
Buildings and improvements	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	38,194,000	37,233,000	'
Computer hardware and software	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	23,306,000	24,135,000	'
Furniture and fixtures	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	4,067,000	5,085,000	'
Landfill	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	69,876,000	70,634,000	'
Machinery and equipment	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	99,533,000	93,724,000	'
Property, plant and equipment acquired under capital leases, gross	0	668,000	'
Trucks and vehicles	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	14,574,000	13,844,000	'
Property, plant and equipment acquired under capital leases, gross	3,899,000	2,929,000	'
Leasehold improvements	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	8,296,000	8,235,000	'
Capital leases	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	8,005,000	6,950,000	'
Construction in progress	'	'	'
Property, Plant and Equipment	'	'	'
Property, Plant and Equipment, gross	11,667,000	9,149,000	'
Computer equipment	'	'	'
Property, Plant and Equipment	'	'	'
Property, plant and equipment acquired under capital leases, gross	$4,106,000	$3,353,000	'

Goodwill_Activity_Details

Goodwill (Activity) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]	'	'
Gross Carrying Amount, Beginning Balance	$526,334	'
Foreign Currency Translation, Beginning Balance	-8,726	'
Accumulated Impairment Losses, Beginning Balance	-209,000	-209,000
Goodwill, Beginning Balance	308,608	306,358
Acquisitions	0	'
Other adjustments	900	2,200
Gross Carrying Amount, Ending Balance	526,334	526,334
Foreign Currency Translation, Ending Balance	-7,826	-8,726
Accumulated Impairment Losses, Ending Balance	-209,000	'
Goodwill, Ending Balance	$309,508	$308,608

Other_Intangible_Assets_Detail

Other Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Intangible Assets	'	'	'
Gross Carrying Amount	$420,566,000	$420,049,000	'
Accumulated Amortization	-206,205,000	-180,498,000	'
Weighted Average Remaining Useful Life	'12 years 9 months 0 days	'13 years 4 months 24 days	'
Translation gain (loss) related to intangible assets denominated in foreign currency	600,000	2,500,000	'
Amortization expense	25,800,000	26,000,000	25,700,000
2014	24,667,000	'	'
2015	21,690,000	'	'
2016	19,660,000	'	'
2017	18,004,000	'	'
2018	17,040,000	'	'
Permits	'	'	'
Other Intangible Assets	'	'	'
Gross Carrying Amount	243,173,000	243,130,000	'
Accumulated Amortization	-86,263,000	-76,406,000	'
Weighted Average Remaining Useful Life	'15 years 9 months 0 days	'16 years 10 months 24 days	'
Customer relationships	'	'	'
Other Intangible Assets	'	'	'
Gross Carrying Amount	161,903,000	161,429,000	'
Accumulated Amortization	-107,718,000	-93,552,000	'
Weighted Average Remaining Useful Life	'4 years 9 months 0 days	'5 years 7 months 6 days	'
Technology and other	'	'	'
Other Intangible Assets	'	'	'
Gross Carrying Amount	15,490,000	15,490,000	'
Accumulated Amortization	($12,224,000)	($10,540,000)	'
Weighted Average Remaining Useful Life	'2 years 1 month 6 days	'3 years 1 month 6 days	'

Goodwill_Details

Goodwill (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Intangible Assets	'	'	'	'
Goodwill	$306,358	$309,508	$308,608	$306,358
Gain (losses) recorded on translation related to goodwill denominated in foreign currencies	'	900	2,200	'
Impairment of goodwill	174,000	0	0	174,000
Discounted Future Cash Flows Relating to Entity's Business Segment Fair Value Calculated as Per Plan and Projections as Basis for Future Cash Flows	'	'	'5 years	'
Fair Value Inputs Residual Growth Rate	'	'	2.50%	'
Fair Value Inputs, Discount Rate	'	'	17.00%	'
Government Group	'	'	'	'
Other Intangible Assets	'	'	'	'
Goodwill	40,236	40,236	40,236	40,236
Impairment of goodwill	'	'	'	35,000
LP and D [Member]	'	'	'	'
Other Intangible Assets	'	'	'	'
Impairment of goodwill	'	'	$35,000	$139,000

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Aug. 13, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2012

Aug. 13, 2010

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Feb. 15, 2013

Dec. 31, 2013

Aug. 13, 2010

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Oct. 15, 2013

Oct. 15, 2013

Mar. 31, 2014

Feb. 15, 2013

Dec. 31, 2013

Dec. 31, 2012

Term loan facilities due through 2016

Term loan facilities due through 2016

Term loan facilities due through 2016

Term loan facilities due through 2016

Term loan facilities due through 2016

Revolving credit facility

Revolving credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Senior secured credit facility

Loan Amendment

Loan Amendment

Senior notes

Senior notes

Senior notes

Senior notes

Senior notes

Senior notes

Rockwell Holdco, Inc

NDT fund

NDT fund

Third Loan Amendment

Third Loan Amendment

Third Loan Amendment

Third Loan Amendment

Third Loan Amendment

Senior notes due 2018

Senior notes due 2018

payment

Adjusted LIBOR

ABR

quarter

payment

Required

Actual

Minimum

Minimum

Maximum

Maximum

Leverage ratio equal to or greater than 3.0 to 1.0

Leverage ratio less than 3.0 to 1.0 but greater than 1.0 to 1.0

Leverage ratio less than 3.0 to 1.0 but greater than 1.0 to 1.0

Leverage ratio equal to or less than 1.0 to 1.0

Leverage ratio equal to or less than 1.0 to 1.0

Adjusted LIBOR

ABR

Prior to August 15, 2014

Twelve month period commencing on August 15, 2014

Twelve month period commencing on August 15, 2015

Twelve month period commencing on August 15, 2016 and thereafter

Senior secured credit facility

Senior secured credit facility

Senior Debt

Senior Debt

Senior Debt

Senior notes

Senior notes

Period from quarter ended September 30, 2014 through the maturity date

Required

Required

Maximum

Minimum

Maximum

July 1, 2013 through September 30, 2014 [Member]

Long-Term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, gross

$740,000,000

'

'

'

$440,000,000

[1]

$527,000,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$653,000,000

'

$300,000,000

$300,000,000

Unamortized discount

-8,186,000

'

'

'

-5,519,000

-8,741,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2,667,000

-3,090,000

Interest rate (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.75%

'

'

'

'

'

'

'

'

'

'

'

6.75%

'

10.75%

'

Line of Credit Facility, Interest Rate at Period End

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.25%

'

'

'

'

'

'

Total debt

731,814,000

815,169,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Less: current portion

-65,000,000

-16,592,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, less current portion

666,814,000

798,577,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable interest rate on borrowings (as a percent)

'

'

'

'

7.25%

6.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

560,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate (as a percent)

'

17.00%

'

2.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.30%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity under credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

105,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Borrowings held in a restricted cash account as collateral for the reimbursement obligations with respect to letters of credit

'

'

'

'

289,700,000

310,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount used to fund letters of credit issued

'

'

'

'

'

'

'

'

58,900,000

73,000,000

'

286,500,000

'

307,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Prepayment premium

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period for refinancing of debt instrument following the execution date of the loan amendment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment of debt financing fees

4,535,000

0

0

'

'

'

'

'

'

'

'

7,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,100,000

'

'

'

'

'

'

'

'

'

Payments of lead arranger banker fees

'

'

'

'

'

'

'

'

'

'

'

8,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,300,000

'

'

'

'

'

'

'

'

'

Capitalized debt financing fees

270,039,000

360,185,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable rate basis

'

'

'

'

'

'

'LIBOR

'ABR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR

'ABR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate basis (as a percent)

'

'

'

'

'

'

5.00%

4.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.50%

3.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Floor rate (as a percent)

'

'

'

'

'

'

1.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of net cash proceeds received from non-ordinary course asset sales or other dispositions, or as a result of a casualty or condemnation to be used for prepayment of debt

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of net proceeds received from the issuance of debt obligations other than certain permitted debt obligations to be used for prepayment of debt

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of excess cash flow to be used for prepayment of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period from filing of annual report on Form 10-K with the SEC after which the prepayments of debt from excess cash flow become due

'

'

'

'

'

'

'

'

'

'

'

'5 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated leverage ratio for mandatory prepayment under the credit facility's covenants

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.17

'

'

'

4

3

'

3

1

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of scheduled principal repayment installments

'

'

'

'

4

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of long-term debt

87,000,000

0

30,200,000

'

'

'

'

'

'

'

87,000,000

87,000,000

30,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

65,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of long-term debt, funded by equity contributions

14,407,000

0

0

'

'

'

'

'

'

'

'

14,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of long-term debt, mandatory payments

'

'

'

'

'

'

'

'

'

'

'

16,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2014

65,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2015

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2016

375,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2017

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2018

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Annual reduction in consolidated leverage ratio under the covenants

'

'

'

'

'

'

'

'

'

'

'

0.25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated cash interest coverage ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.25

2.25

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Annual capital expenditure permitted under the covenants

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Carryforward period of the unused amount from the previous fiscal year

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of the amount permitted for capital expenditures in previous fiscal year by which annual capital expenditure can be increased

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding aggregate principal amount required for applicability of cross-default provisions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

15,199,000

20,345,000

23,734,000

'

'

'

'

'

'

'

'

15,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net assets held by the NDT fund

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

442,917,000

598,496,000

'

'

'

'

'

'

'

Borrowings through private offering

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redemption price of the debt instrument if redeemed with the proceeds of certain public equity offerings as a percentage of principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Redemption price of debt instrument as a percentage of principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

105.38%

102.69%

100.00%

'

'

'

'

'

'

'

'

'

'

Purchase price at which debt may be required to be purchased as a percentage of principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

101.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted payments limit

'

'

'

'

'

'

'

'

'

'

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of consecutive fiscal quarters for restricted payments

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basket for Restricted Payments Limit, Percent

'

'

'

'

'

'

'

'

'

'

'

30.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash interest payments

70,300,000

71,500,000

73,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment term period after third loan amendment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'270 days

'

'

'

'

Maximum amount outstanding threshold on specified debt after period from amendment effective date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

675,000,000

'

'

Payment term period after third loan agreement if principal amount of debt exceeds threshold

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'180 days

'

'

'

'

Additional increase in applicable margin per amendment, percent

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.25%

'

'

'

'

'

Decrease in applicable margin per amendment upon reduction of debt to threshold

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

'

'

'

'

'

Repayments of Long-term Debt, Optional Payments

'

'

'

'

'

'

'

'

'

'

'

'

$26,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

The variable interest rate on borrowings under our senior secured credit facility was 7.25% as of December 31, 2013 and 6.25% as of December 31, 2012.

Details

(Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]	'		'
Accrued project and contract costs	$55,364		$67,880
Salaries and labor related expenses	80,628		67,214
Taxes payable	28,829	[1]	23,617	[1]
U.K. severance	23,055		5,695
Interest payable on long term debt obligations	12,483		13,421
Professional fees	2,867		3,241
Other accrued expenses	4,951		12,478
Accrued expenses and other current liabilities	$208,177		$193,546
[1]	Includes federal and state income tax, property tax, domestic and international sales taxes and waste taxes.

EquityBased_Compensation_Detai

Equity-Based Compensation (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

22-May-13

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Stock options

Stock options

Stock options

Stock options

Phantom Stock

Phantom Stock

Phantom Stock

Equity Based Phantom Stock Awards [Member]

Equity Based Phantom Stock Awards [Member]

Equity Based Phantom Stock Awards [Member]

Rockwell Plan

Rockwell Plan

Rockwell Plan

Rockwell Plan

Rockwell Plan

Minimum

Minimum

Maximum

Stock Options and Restricted Stock

Stock Options and Restricted Stock

Stock Options and Restricted Stock

Stock options

Phantom Stock

Phantom Stock

Equity-Based Compensation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options issued under the plan

'

'

'

'

'

'

'

'

'

'

'

'

'

34,687

'

'

'

'

'

'

'

Aggregate number of shares of common stock that may be issued pursuant to awards granted under the plan

'

10,440,000

'

'

'

'

'

'

'

'

'

'

'

'

36,087

'

'

'

'

'

'

Shares available for future issuance

'

4,563,819

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to grant holders due to change in control provision

$21,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based compensation expense

5,397,000

4,101,000

9,975,000

'

'

'

'

19,800,000

2,900,000

300,000

900,000

100,000

0

'

'

4,500,000

4,000,000

10,000,000

'

'

'

Fair Value Assumptions of Options under Black‑Scholes Model [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected term

'

'

'

'6 years 6 months

'6 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'6 years

'3 years

'6 years

Risk free interest rate

'

'

'

'

1.39%

1.10%

'

0.41%

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk free interest rate (minimum)

'

'

'

'

'

2.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk free interest rate (maximum)

'

'

'

'

'

2.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility rate

'

'

'

72.20%

44.30%

'

'

68.40%

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility rate (minimum)

'

'

'

'

'

42.40%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility rate (minimum)

'

'

'

'

'

46.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Lack of marketability discount (for equity phantom stock awards)

'

'

'

'

'

'

'

15.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation expense

'

'

'

20,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recognition period of unrecognized compensation expense

'

'

'

'4 years 3 months 50 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

'

'

'

$658.70

$1.82

$2.78

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued expenses and other current liabilities

208,177,000

193,546,000

'

'

'

'

'

6,500,000

2,500,000

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, beginning balance

'

'

'

2,497,596

6,530,725

6,602,167

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted

'

'

'

34,687

506,000

'

484,600

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercised

'

'

'

0

0

'

-10,350

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited or expired

'

'

'

-2,497,596

-4,539,129

'

-545,692

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, ending balance

'

'

'

34,687

2,497,596

6,530,725

6,602,167

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, beginning balance

'

'

'

$6.29

$17.55

$18.26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, Granted

'

'

'

$1,000

$4.21

'

$6.22

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, Exercised

'

'

'

$0

$0

'

$5.55

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, Forfeited or expired

'

'

'

$6.29

$22.20

'

$14.70

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, ending balance

'

'

'

$1,000

$6.29

$17.55

$18.26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average remaining life (years)

'

'

'

'

'6 years 10 months 28 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value

'

'

'

'

'

'

$33,100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options vested and expected to vest, December 31, 2013

'

'

'

34,687

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercisable, December 31, 2013

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, Options vested and expected to vest

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average exercise price, Options exercisable

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Facility_and_Equipment_Deconta2

Facility and Equipment Decontamination and Decommissioning (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Facility and equipment decontamination and decommissioning liabilities	$624,204,000	$476,564,000	$624,204,000	'
Facility and equipment decontamination and decommissioning liabilities, current portion	-138,757,000	-98,175,000	-138,757,000	'
Facility and equipment decontamination and decommissioning liabilities	485,447,000	378,389,000	485,447,000	'
Reconciliation of facility and equipment ARO	'	'	'	'
Beginning balance	'	618,359,000	750,649,000	'
Liabilities incurred	'	0	187,000	'
Liabilities settled	'	-171,167,000	-159,776,000	'
Accretion expense	'	-26,308,000	-30,017,000	-32,700,000
ARO estimate adjustments	-8,700,000	-758,000	-2,718,000	-97,100,000
Ending liability	618,359,000	472,742,000	618,359,000	750,649,000
Facilities and equipment ARO—Zion Station	'	'	'	'
Reconciliation of facility and equipment ARO	'	'	'	'
ARO estimate adjustments	'	0	-8,700,000	94,900,000
Letter of credit facility to further support D&D activities	'	200,000,000	'	'
Restricted cash balances	316,800,000	293,900,000	316,800,000	'
Facilities and equipment ARO	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Facility and equipment decontamination and decommissioning liabilities	618,359,000	472,742,000	618,359,000	'
Facilities and equipment ARO | Facilities and equipment ARO—Zion Station	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Facility and equipment decontamination and decommissioning liabilities	553,302,000	409,190,000	553,302,000	'
Facilities and equipment ARO | Facilities and equipment ARO—Clive, UT	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Facility and equipment decontamination and decommissioning liabilities	29,300,000	28,106,000	29,300,000	'
Facilities and equipment ARO | Facilities and equipment ARO—other	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Facility and equipment decontamination and decommissioning liabilities	35,757,000	35,446,000	35,757,000	'
Closure | Barnwell Closure	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Facility and equipment decontamination and decommissioning liabilities	5,845,000	3,822,000	5,845,000	'
Minimum	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Asset Retirement Obligation Estimate Calculated by Applying Inflation Rate	2.27%	2.27%	2.27%	'
Reconciliation of facility and equipment ARO	'	'	'	'
Asset Retirement Obligation Estimate Calculated by Applying Credit Adjusted Risk Free Discount Rate	2.84%	2.84%	2.84%	'
Maximum	'	'	'	'
Facility and Equipment Decontamination and Decommissioning	'	'	'	'
Asset Retirement Obligation Estimate Calculated by Applying Inflation Rate	2.78%	2.60%	2.78%	'
Reconciliation of facility and equipment ARO	'	'	'	'
Asset Retirement Obligation Estimate Calculated by Applying Credit Adjusted Risk Free Discount Rate	9.09%	10.88%	9.09%	'
Letters of Credit and Surety Bonds [Member] | Facilities and equipment ARO—Zion Station	'	'	'	'
Reconciliation of facility and equipment ARO	'	'	'	'
Restricted cash balances	$307,900,000	$285,500,000	$307,900,000	'

EquityBased_Compensation_Detai1

Equity-Based Compensation (Details 2) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'	'
Non-vested shares, beginning balance	1,294,193	997,761	708,898
Granted	0	861,888	694,300
Vested	-1,264,122	-387,507	-302,928
Forfeited	-30,071	-177,949	-102,509
Non-vested shares, ending balance	0	1,294,193	997,761
Weighted average grant-date fair value, beginning balance	$4.80	$5.81	$5.60
Weighted average grant-date fair value, Granted	'	$3.87	$5.53
Weighted average grant-date fair value, Vested	$4.80	$5.31	$4.99
Weighted average grant-date fair value, Forfeited	'	$4.83	$5.72
Weighted average grant-date fair value, ending balance	$0	$4.80	$5.81

Income_Taxes_Income_Before_Tax

Income Taxes (Income Before Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
U.S. income	($80,533)	($9,837)	($258,673)
Foreign income	33,637	31,725	27,879
Income before taxes	($46,896)	$21,888	($230,794)

Income_Taxes_Current_and_Defer

Income Taxes (Current and Deferred) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	$5,961	$9,631	$6,588
State	1,070	580	-117
Foreign	10,229	9,575	7,196
Total current income taxes	17,260	19,786	13,667
Deferred	'	'	'
Federal	-5,959	940	-42,232
State	0	85	-5,720
Foreign	-3,532	-2,852	-2,860
Total deferred income taxes	-9,491	-1,827	-50,812
Income Tax Expense (Benefit)	$7,769	$17,959	($37,145)

Income_Taxes_Federal_Statutory

Income Taxes (Federal Statutory Rate Reconciliation) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal income taxes at statutory rate	($16,414)	$7,661	($80,778)
State income taxes, net of Federal tax benefit	-277	883	-6,123
Meals & entertainment	563	633	604
UK research and development	-3,073	-4,161	-4,925
US research and development	-1,200	0	-1,376
Zion trust income	1,799	16,640	15,125
Foreign tax rate differential	-3,536	-3,331	-1,832
Trust rate differential	-780	-8,314	-8,103
Disallowed and excess compensation	4,434	447	0
Goodwill impairment	0	0	22,890
Change in valuation allowance	85,135	-595	35,149
Effect of §338(g) election	-68,751	0	0
US tax on foreign dividend, net of foreign tax credit	0	1,600	0
US deferred tax on undistributed foreign earnings	5,840	0	0
Tax exempt interest income	-386	-618	0
Disallowed transaction costs	2,834	0	0
Stock compensation deferred adjustment	1,159	9,967	0
Return to provision true-ups with full valuation allowance	0	-2,277	-3,373
Change in contingency reserve	0	-375	-3,271
Other	422	-201	-1,132
Income Tax Expense (Benefit)	$7,769	$17,959	($37,145)

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and LIabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred tax assets - current	'	'
Accrued compensation	$14,294	$6,404
Accrued expenses	2,254	5,036
Allowance for bad debt	1,807	664
Net operating loss carryforwards	22,844	23,854
Other	15	954
Deferred tax assets - current	88,869	118,131
Valuation allowance	-25,164	-8,643
Deferred tax assets current, net of valuation allowance	63,705	109,488
Deferred Tax Liabilities - current	'	'
Prepaid expenses	-972	-2,209
Investment in Zion trust	-41,293	-55,044
Deferred revenue	-9,558	-4,426
Deferred tax on undistributed foreign earnings	-6,058	0
Other	-1,260	-939
Net deferred tax liabilities current	-29,235	-1,101
Deferred tax assets—noncurrent:	'	'
Plant, equipment and intangible assets (including tax-deductible goodwill) principally due to differences in depreciation and amortization	48,569	9,660
Asset retirement obligation	25,179	17,141
Accrued rate and contract reserves	275	997
Deferred rent	3,506	0
Stock compensation	723	2,694
AMT credit carryover	1,839	1,388
Foreign tax credit carryforward	14,353	14,582
General business credit carryforward	10,387	7,274
Capital loss carryforward	7,934	0
Deferred revenue	8,941	439
Investment in joint ventures	13,130	0
Other	957	2,802
Deferred tax assets—non current	373,066	383,405
Valuation allowance	-118,924	-40,297
Deferred tax assets—noncurrent, net of valuation allowance	254,142	343,108
Deferred tax liabilities—noncurrent:	'	'
Plant, equipment and intangible assets principally due to differences in depreciation and amortization	-1,998	-47,030
Accrued rate and contract reserves	-2,435	-2,015
Reclamation	-8,255	-9,595
Investment in NDT fund	-121,228	-160,968
Unrealized gains in NDT Fund investments	-2,051	-7,478
Other	-1,716	-4,148
Net deferred tax assets (liabilities) noncurrent	17,210	-20,507
Total deferred tax assets	317,847	452,596
Total deferred tax liabilities	-329,872	-474,204
Facilities and equipment ARO—Zion Station	'	'
Deferred tax assets - current	'	'
Net operating loss carryforwards	1,128	0
Zion ARO liability	36,083	50,998
Zion deferred revenue	33,288	46,970
Zion cost capitalization	0	7,105
Deferred Tax Liabilities - current	'	'
Zion trust unrealized gain/loss	-698	-1,188
Zion deferred costs	-33,101	-46,783
Deferred tax assets—noncurrent:	'	'
Asset retirement obligation	114,113	152,361
Deferred revenue	100,316	133,635
Zion cost capitalization	0	16,578
Deferred tax liabilities—noncurrent:	'	'
Zion deferred costs	($99,249)	($132,381)

Income_Taxes_Textual_Details

Income Taxes (Textual) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax Credit Carryforward [Line Items]	'	'	'
Operating loss carryforwards	$119,800,000	$113,300,000	'
AMT credit carryover	1,839,000	1,388,000	'
Capital loss carryforward	7,934,000	0	'
Previous period during which income taxes paid were considered in assessing realizability of deferred tax assets	'2 years	'	'
Change in the valuation allowance	95,100,000	0	34,200,000
Foreign earnings repatriated dividend income from foreign subsidiary	'	31,600,000	'
Deferred tax on undistributed foreign earnings	6,058,000	0	'
Gross unrecognized tax benefits	100,000	100,000	'
Income taxes	-7,769,000	-17,959,000	37,145,000
Effective income tax rate (as a percent)	16.60%	81.80%	15.90%
Statutory federal income tax rate (as a percent)	35.00%	'	'
Income taxes payment	10,300,000	18,900,000	26,800,000
United Kingdom	'	'	'
Tax Credit Carryforward [Line Items]	'	'	'
Operating loss carryforwards	57,100,000	53,300,000	'
Valuation allowance	48,900,000	'	'
CANADA	'	'	'
Tax Credit Carryforward [Line Items]	'	'	'
Operating loss carryforwards	4,300,000	3,400,000	'
Internal Revenue Service (IRS) [Member]	'	'	'
Tax Credit Carryforward [Line Items]	'	'	'
Valuation allowance	144,100,000	'	'
Undistributed earnings of foreign subsidiaries	'	98,000,000	'
Foreign Tax Authority [Member]	'	'	'
Tax Credit Carryforward [Line Items]	'	'	'
Tax credit carryforwards	'	14,400,000	'
General Business Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member]	'	'	'
Tax Credit Carryforward [Line Items]	'	'	'
Tax credit carryforwards	$10,400,000	'	'

Segment_Reporting_and_Business2

Segment Reporting and Business Concentrations (Details) (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

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

group

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Number of major operating groups

'

'

'

'

'

'

'

'

'

4

'

'

Revenue from external customers

$474,678

$392,474

$411,038

$526,208

$480,035

$444,157

$392,621

$490,692

'

$1,804,398

[1],[2]

$1,807,505

[1],[2]

$1,815,514

[1],[2]

Income (loss) from operations

28,428

10,239

-22,098

14,875

18,406

18,664

4,089

-1,252

'

31,444

[2],[3]

39,907

[2],[3],[4]

-215,595

[2],[3],[4],[5]

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-68,871

[6]

-79,611

[6]

-80,694

Goodwill

309,508

'

'

'

308,608

'

'

'

306,358

309,508

308,608

306,358

Other long-lived assets

328,837

[7]

'

'

'

358,808

[7]

'

'

'

387,488

[7]

328,837

[7]

358,808

[7]

387,488

[7]

Purchases of property, plant and equipment

'

'

'

'

'

'

'

'

'

15,199

20,345

23,734

Total assets

2,420,543

[8]

'

'

'

2,655,462

[8]

'

'

'

3,015,933

[8]

2,420,543

[8]

2,655,462

[8]

3,015,933

[8]

Income (loss) from unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

4,465

7,392

11,103

Property, Plant and Equipment, Net

114,476

'

'

'

117,744

'

'

'

126,609

114,476

117,744

126,609

ARO estimate adjustments

'

'

'

'

-8,700

'

'

'

'

-758

-2,718

-97,100

Impairment of goodwill

'

'

'

'

'

'

'

'

174,000

0

0

174,000

Government Group

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

295,816

[1],[2]

309,188

[1],[2]

411,828

[1],[2]

Income (loss) from operations

'

'

'

'

'

'

'

'

'

21,415

[2],[3]

20,408

[2],[3],[4]

-106,366

[2],[3],[4],[5]

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-26,616

[6]

-30,869

[6]

-34,855

[6]

Goodwill

40,236

'

'

'

40,236

'

'

'

40,236

40,236

40,236

40,236

Other long-lived assets

15,193

[7]

'

'

'

17,598

[7]

'

'

'

26,063

[7]

15,193

[7]

17,598

[7]

26,063

[7]

Purchases of property, plant and equipment

'

'

'

'

'

'

'

'

'

80

1,756

1,200

Total assets

1,143,673

[8]

'

'

'

1,434,407

[8]

'

'

'

1,660,477

[8]

1,143,673

[8]

1,434,407

[8]

1,660,477

[8]

Income (loss) from unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

6,500

7,700

11,300

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

'

35,000

CS

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

84,242

[1],[2]

125,816

[1],[2]

49,990

[1],[2]

Income (loss) from operations

'

'

'

'

'

'

'

'

'

11,863

[2],[3]

14,856

[2],[3],[4]

3,181

[2],[3],[4],[5]

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-2,061

[6]

-1,911

[6]

-2,180

[6]

Goodwill

17,951

'

'

'

17,951

'

'

'

17,951

17,951

17,951

17,951

Other long-lived assets

15,706

[7]

'

'

'

18,840

[7]

'

'

'

18,904

[7]

15,706

[7]

18,840

[7]

18,904

[7]

Purchases of property, plant and equipment

'

'

'

'

'

'

'

'

'

237

2,075

3,840

Total assets

52,642

[8]

'

'

'

63,210

[8]

'

'

'

51,506

[8]

52,642

[8]

63,210

[8]

51,506

[8]

LP&D

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

236,854

[1],[2]

233,075

[1],[2]

252,659

[1],[2]

Income (loss) from operations

'

'

'

'

'

'

'

'

'

65,805

[2],[3]

48,660

[2],[3],[4]

-77,789

[2],[3],[4],[5]

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-28,829

[6]

-34,382

[6]

-31,382

[6]

Goodwill

207,990

'

'

'

207,216

'

'

'

208,250

207,990

207,216

208,250

Other long-lived assets

248,274

[7]

'

'

'

262,826

[7]

'

'

'

269,017

[7]

248,274

[7]

262,826

[7]

269,017

[7]

Purchases of property, plant and equipment

'

'

'

'

'

'

'

'

'

13,719

15,314

14,470

Total assets

612,423

[8]

'

'

'

641,826

[8]

'

'

'

689,645

[8]

612,423

[8]

641,826

[8]

689,645

[8]

Income (loss) from unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

2,000

300

200

International

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

1,187,486

[1],[2]

1,139,426

[1],[2]

1,101,037

[1],[2]

Income (loss) from operations

'

'

'

'

'

'

'

'

'

30,765

[2],[3]

30,283

[2],[3],[4]

26,015

[2],[3],[4],[5]

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-7,625

[6]

-7,568

[6]

-7,644

[6]

Goodwill

43,331

'

'

'

43,205

'

'

'

39,921

43,331

43,205

39,921

Other long-lived assets

42,195

[7]

'

'

'

49,275

[7]

'

'

'

53,937

[7]

42,195

[7]

49,275

[7]

53,937

[7]

Purchases of property, plant and equipment

'

'

'

'

'

'

'

'

'

201

388

635

Total assets

522,533

[8]

'

'

'

378,111

[8]

'

'

'

511,872

[8]

522,533

[8]

378,111

[8]

511,872

[8]

Corporate Unallocated Items

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

0

[1],[2]

0

[1],[2]

0

[1],[2]

Income (loss) from operations

'

'

'

'

'

'

'

'

'

-98,404

[2],[3]

-74,300

[2],[3],[4]

-60,636

[2],[3],[4],[5]

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-3,740

[6]

-4,881

[6]

-4,633

[6]

Goodwill

0

'

'

'

0

'

'

'

0

0

0

0

Other long-lived assets

7,469

[7]

'

'

'

10,269

[7]

'

'

'

19,567

[7]

7,469

[7]

10,269

[7]

19,567

[7]

Purchases of property, plant and equipment

'

'

'

'

'

'

'

'

'

962

812

3,589

Total assets

89,272

[8]

'

'

'

137,908

[8]

'

'

'

102,433

[8]

89,272

[8]

137,908

[8]

102,433

[8]

Intersegment Eliminations

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

20,800

22,700

19,800

LP and D [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

35,000

139,000

Cost of Revenue [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-47,900

-56,300

-58,300

Selling, General and Administrative Expenses [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization and accretion expense

'

'

'

'

'

'

'

'

'

-20,900

-23,300

-22,400

United Kingdom

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

1,187,486

1,139,426

1,101,037

Property, Plant and Equipment, Net

624

'

'

'

1,108

'

'

'

807

624

1,108

807

Other Country [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

68,724

103,694

24,305

Property, Plant and Equipment, Net

1,434

'

'

'

1,866

'

'

'

647

1,434

1,866

647

UNITED STATES

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

Revenue from external customers

'

'

'

'

'

'

'

'

'

548,188

564,385

690,172

Property, Plant and Equipment, Net

112,418

'

'

'

114,770

'

'

'

125,155

112,418

114,770

125,155

Facilities and equipment ARO—Zion Station

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting and Business Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

ARO estimate adjustments

'

'

'

'

'

'

'

'

'

$0

($8,700)

$94,900

[1]

We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.

[2]

Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and

[3]

For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.

[4]

Included in income (loss) from operations from our Projects group for the years ended December 31, 2012 and 2011, is an $8.7 million non-cash favorable ARO adjustment and a $94.9 million non cash unfavorable ARO estimated cost adjustment, respectively, related to the Zion Station project, for which no corresponding revenue was recognized.

[5]

For the year ended December 31, 2011, included in income (loss) from operations from our Projects and LP&D groups, is a goodwill impairment charge of $35.0 million and $139.0 million, respectively.

[6]

Depreciation, amortization and accretion expenses ("DA&A") are included in cost of revenue and SG&A expenses in the accompanying consolidated statements of operations and comprehensive income (loss). DA&A expenses included in cost of revenue for the years ended December 31, 2013, 2012 and 2011, were $47.9 million, $56.3 million and $58.3 million, respectively. DA&A expenses included in SG&A for years ended December 31, 2013, 2012 and 2011, were $20.9 million, $23.3 million and $22.4 million, respectively.

[7]

Other long-lived assets include property, plant and equipment and other intangible assets.

[8]

Corporate unallocated assets relate primarily to income tax receivables, deferred tax assets, deferred financing costs, prepaid expenses, and property, plant and equipment that benefit the entire Company and cash

Customer_Concentrations_Detail

Customer Concentrations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Customer Concentrations	'	'	'
Accounts receivable	287,438	259,913	'
Costs and estimated earnings in excess of billings on uncompleted contracts	85,965	98,978	'
DOE	'	'	'
Customer Concentrations	'	'	'
Accounts receivable	20,400	19,400	'
Costs and estimated earnings in excess of billings on uncompleted contracts	33,500	33,500	'
NDA	'	'	'
Customer Concentrations	'	'	'
Accounts receivable	215,800	186,000	'
Revenue | Customer | DOE	'	'	'
Customer Concentrations	'	'	'
Concentration risk (as a percent)	12.10%	11.00%	15.30%
Revenue | Customer | NDA	'	'	'
Customer Concentrations	'	'	'
Concentration risk (as a percent)	64.90%	63.80%	61.00%

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Operating Leases	'
2014	$13,449
2015	8,391
2016	5,692
2017	4,090
2018	3,215
Thereafter	9,400
Future minimum lease payments	44,237
Sublease Rental Income	'
2014	-1,271
2015	-2,003
2016	-1,388
2017	-1,035
2018	-822
Thereafter	-3,610
Future minimum sublease income	-10,129
Capital Leases	'
2014	1,040
2015	1,006
2016	918
2017	413
2018	159
Future minimum lease payments	3,536
Less portion representing interest	-389
Less current portion of capital lease obligations	-861
Long-term portion of capital lease obligations	2,286
Other Contractual Obligations	'
2014	2,500
2015	2,500
2016	0
Future minimum lease payments	$5,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Textual) (Details) (USD $)	12 Months Ended							0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Jul. 14, 2011
				Senior secured credit facility	Senior secured credit facility	Revolving credit facility	Revolving credit facility	Pennington et al.v. ZionSolutions LLC, et al.
								plaintiff
Loss Contingencies [Line Items]	'	'	'	'	'	'	'	'
Rent expense on noncancellable leases	$24,000,000	$21,000,000	$18,500,000	'	'	'	'	'
Sublease income related to vacant facilities	200,000	200,000	0	'	'	'	'	'
Capital leases expiration term	'5 years	'	'	'	'	'	'	'
Capital lease obligations	3,100,000	2,600,000	'	'	'	'	'	'
Letter of credit facility to further support D&D activities	'	'	'	286,500,000	307,100,000	58,900,000	73,000,000	'
Surety bonds outstanding, amount	60,500,000	27,500,000	'	'	'	'	'	'
Closure and post-closure state regulatory requirements for facilities	$142,500,000	$151,500,000	'	'	'	'	'	'
Number of individuals who filed a complaint	'	'	'	'	'	'	'	4

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details)	12 Months Ended						12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
	Defined contribution 401(k) plan	Defined contribution 401(k) plan	Defined contribution 401(k) plan	United Kingdom	ESEU Plan	Magnox Plan	NDA	NDA	NDA	NDA
	USD ($)	USD ($)	USD ($)		United Kingdom	United Kingdom	Magnox Plan	Magnox Plan	Magnox Plan	Magnox Plan
					employee	employee	United Kingdom	United Kingdom	United Kingdom	United Kingdom
							USD ($)	USD ($)	USD ($)	GBP (£)
Defined contribution plans	'	'	'	'	'	'	'	'	'	'
Employer matching contributions as a percentage of employee contributions	50.00%	'	'	'	'	'	'	'	'	'
Percentage of eligible compensation, matched by employer	6.00%	'	'	'	'	'	'	'	'	'
Employer's additional discretionary contribution (as a percent)	1.00%	'	'	'	'	'	'	'	'	'
Vesting period of employer contributions	'4 years	'	'	'	'	'	'	'	'	'
Contributions to the plan	$3.70	$3.60	$3.50	'	'	'	'	'	'	'
Number of employees covered under defined benefit pension plan	'	'	'	'	60	'	'	'	'	'
Maximum percentage of salary paid by the company into defined contribution pension scheme for all other U.K. employees not covered in defined benefit pension plan	'	'	'	12.00%	'	'	'	'	'	'
Entity Number of Employees	'	'	'	'	'	3,300	'	'	'	'
Annual repair contribution in addition to employer pension contribution for years with underfunded position	'	'	'	'	'	'	'	'	'	20
Revenue from NDA	'	'	'	'	'	'	43.1	77.3	77.8	'
Amount receivable from NDA, due to underfunded status	'	'	'	'	'	'	103.6	'	'	'
Amount payable to NDA, due to overfunded status	'	'	'	'	'	'	$39.50	'	'	'

Employee_Benefit_Plans_Details1

Employee Benefit Plans (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in projected benefit obligation:	'	'	'
Projected benefit obligation at beginning of period	$3,836,343	$3,447,461	'
Service cost	57,272	56,271	56,635
Interest cost	156,011	159,303	173,275
Member contributions	469	476	'
Termination benefits	9,858	23,142	'
Benefits paid	-160,392	-169,447	'
Actuarial gain	220,480	155,815	'
Foreign currency translation	91,925	163,322	'
Projected benefit obligation at end of year	4,211,966	3,836,343	3,447,461
Changes in plan assets:	'	'	'
Beginning balance	3,875,793	3,580,382	'
Actual return on plan assets	250,994	193,382	'
Company contributions	47,257	85,595	'
Employee contributions	469	476	'
Termination benefits	8,919	17,912	'
Benefits paid	-160,392	-169,447	'
Foreign currency translation	85,343	167,493	'
Ending balance	4,108,383	3,875,793	3,580,382
Funded status at end of year	-103,583	39,450	'
Amounts recognized in the consolidated balance sheet	'	'	'
Pension assets included in other noncurrent assets	103,563	39,773	'
Pension liabilities included in other noncurrent liabilities	-111,644	-31,043	'
Accumulated other comprehensive loss (pretax)	($9,712)	($4,880)	'
Weighted average assumptions used to determine benefit obligations	'	'	'
Discount rate (as a percent)	4.40%	4.30%	'
Rate of compensation increase (as a percent)	3.60%	3.10%	'
United Kingdom	'	'	'
Defined benefit pension plans	'	'	'
Maximum percentage of salary paid by the company into defined contribution pension scheme for all other U.K. employees not covered in defined benefit pension plan	12.00%	'	'
Minimum	'	'	'
Weighted average assumptions used to determine benefit obligations	'	'	'
Expected rates of return on plan assets (as a percent)	5.20%	4.90%	'
Maximum	'	'	'
Weighted average assumptions used to determine benefit obligations	'	'	'
Expected rates of return on plan assets (as a percent)	5.30%	5.80%	'
ESEU Plan | United Kingdom	'	'	'
Defined benefit pension plans	'	'	'
Number of employees covered under defined benefit pension plan	60	'	'
Magnox Plan | United Kingdom	'	'	'
Defined benefit pension plans	'	'	'
Entity Number of Employees	3,300	'	'

Employee_Benefit_Plans_Details2

Employee Benefit Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined benefit pension plans	'	'	'
Percentage of allocations and the weighted average actual allocations of plan assets	100.00%	100.00%	'
Investments, at fair value	$4,108,383,000	$3,875,793,000	$3,580,382,000
Expected future employer contribution in next fiscal year	52,700,000	'	'
Estimated benefit plan payments	'	'	'
2014	174,145,000	'	'
2015	179,422,000	'	'
2016	184,699,000	'	'
2017	190,471,000	'	'
2018	196,243,000	'	'
Thereafter	1,073,564,000	'	'
Level 1	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	1,221,900,000	1,951,446,000	'
Level 2	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	2,506,863,000	1,571,464,000	'
Level 3	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	379,620,000	352,883,000	'
Equity securities	'	'	'
Defined benefit pension plans	'	'	'
Percentage of allocations and the weighted average actual allocations of plan assets	16.60%	14.70%	'
Investments, at fair value	1,285,341,000	1,108,931,000	'
Equity securities | Level 1	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	1,148,136,000	1,108,931,000	'
Equity securities | Level 2	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	137,205,000	'	'
Bonds	'	'	'
Defined benefit pension plans	'	'	'
Percentage of allocations and the weighted average actual allocations of plan assets	47.50%	55.70%	'
Real Estate	'	'	'
Defined benefit pension plans	'	'	'
Percentage of allocations and the weighted average actual allocations of plan assets	5.10%	5.00%	'
Investments, at fair value	153,693,000	493,705,000	'
Real Estate | Level 2	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	0	145,996,000	'
Real Estate | Level 3	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	153,693,000	347,709,000	'
Other	'	'	'
Defined benefit pension plans	'	'	'
Percentage of allocations and the weighted average actual allocations of plan assets	30.80%	24.60%	'
Cash	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	73,764,000	5,384,000	'
Cash | Level 1	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	73,764,000	5,384,000	'
Fixed income securities	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	2,595,585,000	2,267,773,000	'
Fixed income securities | Level 1	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	0	837,131,000	'
Fixed income securities | Level 2	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	2,369,658,000	1,425,468,000	'
Fixed income securities | Level 3	'	'	'
Defined benefit pension plans	'	'	'
Investments, at fair value	$225,927,000	$5,174,000	'

Employee_Benefit_Plans_Details3

Employee Benefit Plans (Details 4) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]	'	'	'
Service cost	$57,272	$56,271	$56,635
Interest cost	156,011	159,303	173,275
Expected return on plan assets	-182,456	-171,983	-182,420
Net actuarial loss	1,408	951	0
Termination benefits	8,763	22,667	8,182
Total net periodic benefit costs	$40,998	$67,209	$55,672

Employee_Benefit_Plans_Details4

Employee Benefit Plans (Details 5) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in plan assets:	'	'	'
Beginning balance	$3,875,793	$3,580,382	'
Realized gains and losses	-1,408	-951	0
Ending balance	4,108,383	3,875,793	3,580,382
Fair Value, Inputs, Level 3 [Member]	'	'	'
Changes in plan assets:	'	'	'
Beginning balance	352,883	'	'
Purchases and issuances	26,132	'	'
Sales, dispositions and settlements	0	'	'
Realized gains and losses	-1,252	'	'
Change in unrealized gains and losses	1,857	'	'
Ending balance	$379,620	'	'

Restructuring_Reconciliation_o

Restructuring (Reconciliation of Liability Balances) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
			Reduction of employees	Reduction of employees
			Magnox organizational restructuring program	Magnox organizational restructuring program
Reconciliation of the beginning and ending liability balances	'	'	'	'
Beginning liability	'	'	$5,695	$32,659
Additions	15,400	0	55,555	'
Payments	'	'	-17,195	-27,888
Effect of exchange rate	'	'	2,673	924
Restructuring reserve, ending balance	'	'	46,728	5,695
Restructuring reserve, current	'	'	-23,055	0
Restructuring reserve, noncurrent	'	'	$23,673	$5,695

Restructuring_Details

Restructuring (Details) (USD $)

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2009

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2009

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Magnox organizational restructuring program

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

Cost of Revenue [Member]

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Other Noncurrent Liabilities [Member]

Other Noncurrent Liabilities [Member]

phase

Magnox sites

Period through 2015

Period from 2016 to 2020

Reduction of employees

Reduction of employees

Reduction of employees

Reduction of employees

Reduction of employees

Contract Termination [Member]

Contract Termination [Member]

Contract Termination [Member]

Employee Severance and Termination Benefits [Member]

Professional, Legal and Consulting Fees [Member]

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

Restructuring Plan

site

change

Magnox sites

Magnox sites

Magnox sites

Bradwel lSite [Member]

Contract Termination [Member]

Contract Termination [Member]

Employee Severance and Termination Benefits [Member]

Employee Severance and Termination Benefits [Member]

Contract Termination [Member]

Contract Termination [Member]

site

employee

employee

employee

employee

LP and D [Member]

Restructuring Cost and Reserve [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring costs

$15,400,000

$0

'

'

'

'

$55,555,000

'

'

'

'

'

'

$1,500,000

$5,500,000

'

'

$5,200,000

$1,800,000

$3,700,000

$8,700,000

$1,100,000

'

'

Restructuring liability

'

'

'

'

'

'

23,055,000

0

'

'

'

1,100,000

4,400,000

'

9,500,000

1,300,000

'

'

'

'

'

'

7,300,000

1,300,000

Unpaid liability payment period

'

'

'

'

'

'

'24 months

'

'

'

'

'

'

'

'

'

'6 months

'

'

'

'

'

'

'

Number of Magnox sites identified to reduce the existing workforce

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of phases in which termination plan presented

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of employees who left on a voluntary basis

'

'

'

'

'

'

'

'

'

300

200

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring reserve

'

'

'

'

'

'

46,728,000

5,695,000

32,659,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional disclosures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of changes in organization

'

'

'

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Magnox sites under full organizational review

'

'

'

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period of changes in organization

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected additional reduction in employees

'

'

'

'

600

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period of expected manpower reduction

'

'

'

'

'2 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated termination benefit costs

'

'

'

'

$96,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period for payment of total termination benefit costs

'

'

'

'

'6 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related_Party_Transactions_Det

Related Party Transactions (Details)	0 Months Ended	12 Months Ended	0 Months Ended
	Jul. 26, 2012	Dec. 31, 2013	Jun. 07, 2013
	Chief executive officer	Board of Directors Chairman	Purchase of Common Stock [Member]
	USD ($)	GBP (£)	Common Stock
			Chief executive officer
			USD ($)
Related party transactions	'	'	'
Stock Purchased by Related Party During Period, Shares	'	'	5,000
Stock Purchased by Related Party During Period, Value	'	'	$5,000,000
Number of shares purchased by related party	884,614	'	'
Share price (in dollars per share)	$1.69	'	'
Annual fee to the Chair of Company's Board	'	£ 150,000	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Changes in the accumulated balances for each component of other comprehensive income	'
Beginning Balance	($21,956)
Current period other comprehensive income (loss)	-921
Ending balance	-22,877
Foreign currency translation items	'
Changes in the accumulated balances for each component of other comprehensive income	'
Beginning Balance	-17,076
Current period other comprehensive income (loss)	3,911
Ending balance	-13,165
Change in unrecognized actuarial loss	'
Changes in the accumulated balances for each component of other comprehensive income	'
Beginning Balance	-4,880
Current period other comprehensive income (loss)	-4,832
Ending balance	($9,712)

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Share data in Thousands, except Per 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, 2013

Dec. 31, 2012

Dec. 31, 2011

24-May-13

Dec. 31, 2013

Energy Solutions Inc.

Senior secured credit facility

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Merger transaction related costs expensed

'

'

'

'

'

'

'

'

'

'

'

$32,600,000

'

Payments of lead arranger banker fees

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000

Statement of operations data:

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

474,678,000

392,474,000

411,038,000

526,208,000

480,035,000

444,157,000

392,621,000

490,692,000

1,804,398,000

[1],[2]

1,807,505,000

[1],[2]

1,815,514,000

[1],[2]

'

'

Gross profit

67,128,000

36,485,000

47,397,000

46,430,000

56,986,000

46,157,000

35,903,000

31,680,000

197,440,000

170,726,000

79,688,000

'

'

Income (loss) from operations

28,428,000

10,239,000

-22,098,000

14,875,000

18,406,000

18,664,000

4,089,000

-1,252,000

31,444,000

[2],[3]

39,907,000

[2],[3],[4]

-215,595,000

[2],[3],[4],[5]

'

'

Net income (loss) attributable to EnergySolutions

15,632,000

-4,855,000

-57,230,000

-8,200,000

-10,845,000

10,052,000

5,444,000

-669,000

-54,653,000

3,982,000

-196,181,000

'

'

Net income (loss) per share data:

'

'

'

'

'

'

'

'

'

'

'

'

'

Basic (in dollars per share)

'

'

'

($0.09)

($0.12)

$0.11

$0.06

($0.01)

'

'

'

'

'

Diluted (in dollars per share)

'

'

'

($0.09)

($0.12)

$0.11

$0.06

($0.01)

'

'

'

'

'

Number of shares used in per share calculations:

'

'

'

'

'

'

'

'

'

'

'

'

'

Basic (in shares)

'

'

'

90,360

90,253

89,994

89,249

89,066

'

'

'

'

'

Diluted (in shares)

'

'

'

90,360

90,256

89,994

89,249

89,066

'

'

'

'

'

Reversal of incentive fee related to Salt Waste project

'

'

'

'

'

'

'

5,600,000

'

'

'

'

'

Restructuring costs

'

'

'

'

15,400,000

'

'

'

'

0

'

'

'

ARO cost estimate adjustment for the Zion Station project

'

'

'

'

8,700,000

'

'

'

758,000

2,718,000

97,100,000

'

'

Income tax expense resulting from an increase in the valuation allowance for deferred tax assets

'

'

'

'

'

'

'

'

'

$18,000,000

'

'

'

[1]

We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.

[2]

Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and

[3]

For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.

[4]

Included in income (loss) from operations from our Projects group for the years ended December 31, 2012 and 2011, is an $8.7 million non-cash favorable ARO adjustment and a $94.9 million non cash unfavorable ARO estimated cost adjustment, respectively, related to the Zion Station project, for which no corresponding revenue was recognized.

[5]

For the year ended December 31, 2011, included in income (loss) from operations from our Projects and LP&D groups, is a goodwill impairment charge of $35.0 million and $139.0 million, respectively.

Guarantor_and_NonGuarantor_Fin2

Guarantor and Non-Guarantor Financial Information (Details) (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

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

$474,678

$392,474

$411,038

$526,208

$480,035

$444,157

$392,621

$490,692

'

$1,804,398

[1],[2]

$1,807,505

[1],[2]

$1,815,514

[1],[2]

Cost of revenue

'

'

'

'

'

'

'

'

'

-1,606,958

-1,636,779

-1,735,826

Gross profit

67,128

36,485

47,397

46,430

56,986

46,157

35,903

31,680

'

197,440

170,726

79,688

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

-170,461

-138,211

-132,386

Impairment of goodwill

'

'

'

'

'

'

'

'

-174,000

0

0

-174,000

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

4,465

7,392

11,103

Income (loss) from operations

28,428

10,239

-22,098

14,875

18,406

18,664

4,089

-1,252

'

31,444

[2],[3]

39,907

[2],[3],[4]

-215,595

[2],[3],[4],[5]

Interest expense

'

'

'

'

'

'

'

'

'

-76,774

-71,211

-73,414

Income (loss) from subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Other, net

'

'

'

'

'

'

'

'

'

-1,566

53,192

58,215

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

-46,896

21,888

-230,794

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

'

7,769

17,959

-37,145

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,665

3,929

-193,649

Less: net income attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

12

53

-2,532

Net income (loss) attributable to EnergySolutions

15,632

-4,855

-57,230

-8,200

-10,845

10,052

5,444

-669

'

-54,653

3,982

-196,181

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,665

3,929

-193,649

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

3,911

6,863

147

Change in unrecognized actuarial loss

'

'

'

'

'

'

'

'

'

-4,832

-450

-3,005

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

-55,586

10,342

-196,507

Less: net loss attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

12

53

-2,532

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

-55,574

10,395

-199,039

Energy Solutions, Inc.

'

'

'

'

'

'

'

'

'

'

'

'

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

0

0

0

Cost of revenue

'

'

'

'

'

'

'

'

'

0

0

0

Gross profit

'

'

'

'

'

'

'

'

'

0

0

0

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

0

0

0

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

'

0

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

'

0

0

0

Interest expense

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from subsidiaries

'

'

'

'

'

'

'

'

'

-54,619

3,993

-256,723

Other, net

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

-54,619

3,993

-256,723

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

'

34

11

-60,542

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,653

3,982

-196,181

Less: net income attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

-54,653

3,982

-196,181

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,653

3,982

-196,181

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

0

0

0

Change in unrecognized actuarial loss

'

'

'

'

'

'

'

'

'

0

0

0

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

-54,653

3,982

-196,181

Less: net loss attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

-54,653

3,982

-196,181

EnergySolutions, LLC

'

'

'

'

'

'

'

'

'

'

'

'

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

92,188

75,143

112,675

Cost of revenue

'

'

'

'

'

'

'

'

'

-34,534

-40,716

-59,385

Gross profit

'

'

'

'

'

'

'

'

'

57,654

34,427

53,290

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

-121,617

-84,430

-70,087

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

'

-108,600

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

'

-63,963

-50,003

-125,397

Interest expense

'

'

'

'

'

'

'

'

'

-61,640

-57,770

-59,747

Income (loss) from subsidiaries

'

'

'

'

'

'

'

'

'

78,588

116,526

-75,613

Other, net

'

'

'

'

'

'

'

'

'

-7,604

-4,760

4,034

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

-54,619

3,993

-256,723

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,619

3,993

-256,723

Less: net income attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

-54,619

3,993

-256,723

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

-54,619

3,993

-256,723

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

0

6,863

147

Change in unrecognized actuarial loss

'

'

'

'

'

'

'

'

'

0

-450

-3,005

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

-54,619

10,406

-259,581

Less: net loss attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

-54,619

10,406

-259,581

Guarantor Subsidiaries

'

'

'

'

'

'

'

'

'

'

'

'

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

386,838

453,709

429,098

Cost of revenue

'

'

'

'

'

'

'

'

'

-313,263

-384,463

-381,240

Gross profit

'

'

'

'

'

'

'

'

'

73,575

69,246

47,858

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

-27,405

-33,297

-25,485

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

'

-65,400

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

4,465

7,392

11,103

Income (loss) from operations

'

'

'

'

'

'

'

'

'

50,635

43,341

-31,924

Interest expense

'

'

'

'

'

'

'

'

'

-5

0

0

Income (loss) from subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Other, net

'

'

'

'

'

'

'

'

'

156

-1,256

216

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

50,786

42,085

-31,708

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

'

50,786

42,085

-31,708

Less: net income attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

50,786

42,085

-31,708

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

50,786

42,085

-31,708

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

0

0

0

Change in unrecognized actuarial loss

'

'

'

'

'

'

'

'

'

0

0

0

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

50,786

42,085

-31,708

Less: net loss attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

50,786

42,085

-31,708

Non-Guarantor Subsidiaries

'

'

'

'

'

'

'

'

'

'

'

'

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

1,385,938

1,331,675

1,323,993

Cost of revenue

'

'

'

'

'

'

'

'

'

-1,319,727

-1,264,622

-1,345,453

Gross profit

'

'

'

'

'

'

'

'

'

66,211

67,053

-21,460

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

-21,439

-20,484

-36,814

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

'

0

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

'

44,772

46,569

-58,274

Interest expense

'

'

'

'

'

'

'

'

'

-15,129

-13,441

-13,667

Income (loss) from subsidiaries

'

'

'

'

'

'

'

'

'

0

0

0

Other, net

'

'

'

'

'

'

'

'

'

5,882

59,208

53,965

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

35,525

92,336

-17,976

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

'

7,735

17,948

23,397

Net income (loss)

'

'

'

'

'

'

'

'

'

27,790

74,388

-41,373

Less: net income attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

12

53

-2,532

Net income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

27,802

74,441

-43,905

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

27,790

74,388

-41,373

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

3,911

6,863

147

Change in unrecognized actuarial loss

'

'

'

'

'

'

'

'

'

-4,832

-450

-3,005

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

26,869

80,801

-44,231

Less: net loss attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

12

53

-2,532

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

26,881

80,854

-46,763

Eliminations

'

'

'

'

'

'

'

'

'

'

'

'

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

-60,566

-53,022

-50,252

Cost of revenue

'

'

'

'

'

'

'

'

'

60,566

53,022

50,252

Gross profit

'

'

'

'

'

'

'

'

'

0

0

0

Selling, general and administrative expenses

'

'

'

'

'

'

'

'

'

0

0

0

Impairment of goodwill

'

'

'

'

'

'

'

'

'

'

'

0

Equity in income of unconsolidated joint ventures

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

'

0

0

0

Interest expense

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from subsidiaries

'

'

'

'

'

'

'

'

'

-23,969

-120,519

332,336

Other, net

'

'

'

'

'

'

'

'

'

0

0

0

Income (loss) before income taxes and noncontrolling interests

'

'

'

'

'

'

'

'

'

-23,969

-120,519

332,336

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

'

-23,969

-120,519

332,336

Less: net income attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Net income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

-23,969

-120,519

332,336

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

'

'

'

'

'

'

'

'

'

-23,969

-120,519

332,336

Foreign currency translation adjustments, net of taxes

'

'

'

'

'

'

'

'

'

0

-6,863

-147

Change in unrecognized actuarial loss

'

'

'

'

'

'

'

'

'

0

450

3,005

Other comprehensive income (loss), net of taxes

'

'

'

'

'

'

'

'

'

-23,969

-126,932

335,194

Less: net loss attributable to noncontrolling interests

'

'

'

'

'

'

'

'

'

0

0

0

Comprehensive income (loss) attributable to EnergySolutions

'

'

'

'

'

'

'

'

'

($23,969)

($126,932)

$335,194

[1]

We eliminate intersegment revenue in consolidation. Intersegment revenue for the years ended December 31, 2013, 2012 and 2011, was $20.8 million, $22.7 million, and $19.8 million, respectively. Revenue by segment represent revenue earned based on third-party billings to customers.

[2]

Results of our operations for services provided to our customers in Asia and Europe are included in our Products Group and

[3]

For the years ended December 31, 2013, 2012 and 2011, we recorded $4.5 million, $7.4 million and $11.1 million, respectively, of income from our unconsolidated joint ventures of which $2.0 million, $0.3 million and $0.2 million, respectively, of losses are attributable to our LP&D Group and $6.5 million, $7.7 million and $11.3 million, respectively, of income is attributable to the Projects group.

[4]

Included in income (loss) from operations from our Projects group for the years ended December 31, 2012 and 2011, is an $8.7 million non-cash favorable ARO adjustment and a $94.9 million non cash unfavorable ARO estimated cost adjustment, respectively, related to the Zion Station project, for which no corresponding revenue was recognized.

[5]

For the year ended December 31, 2011, included in income (loss) from operations from our Projects and LP&D groups, is a goodwill impairment charge of $35.0 million and $139.0 million, respectively.

Guarantor_and_NonGuarantor_Fin3

Guarantor and Non-Guarantor Financial Information (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
	subsidiary
Guarantor and Non-Guarantor Financial Information	'		'		'		'
Maximum number of other special purpose subsidiaries that may be established for license stewardship projects and excluded as a guarantor of senior secured credit facility	5		'		'		'
Assets	'		'		'		'
Cash and cash equivalents	$84,213,000		$134,191,000		$77,213,000		$60,192,000
Accounts receivable, net of allowance for doubtful accounts	287,438,000		259,913,000		'		'
Costs and estimated earnings in excess of billings on uncompleted contracts	85,965,000		98,978,000		'		'
Nuclear decommissioning trust fund investments, current portion	112,475,000		152,507,000		'		'
Deferred costs, current portion	91,841,000		127,573,000		'		'
Other Assets	15,868,000		'		'		'
Total current assets	677,800,000		794,535,000		'		'
Property, plant and equipment, net	114,476,000		117,744,000		'		'
Goodwill	309,508,000		308,608,000		306,358,000		'
Intangibles, net	214,361,000		239,551,000		'		'
Restricted cash	293,896,000		316,754,000		'		'
Nuclear decommissioning trust fund	330,442,000		445,989,000		'		'
Deferred income taxes	29,707,000		0		'		'
Long-term deferred costs less current portion	270,039,000		360,185,000		'		'
Investment in subsidiaries	0		0		'		'
Intercompany receivable	0		0		'		'
Other long term assets	180,314,000		72,096,000		'		'
Total assets	2,420,543,000	[1]	2,655,462,000	[1]	3,015,933,000	[1]	'
Liabilities and Stockholders’ Equity	'		'		'		'
Accounts payable	145,857,000		144,649,000		'		'
Accrued expenses and other current liabilities	208,177,000		193,546,000		'		'
Unearned revenue, current portion	118,465,000		150,135,000		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	98,175,000		138,757,000		'		'
Other Liabilities, Current	95,363,000		'		'		'
Intercompany payable	0		0		'		'
Total current liabilities	666,037,000		644,780,000		'		'
Intercompany loan payable	0		0		'		'
Long-term debt, less current portion	666,814,000		798,577,000		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	378,389,000		485,447,000		'		'
Unearned revenue, less current portion	272,940,000		366,710,000		'		'
Other liabilities, net	168,148,000		59,029,000		'		'
Stockholders' equity	267,727,000		300,419,000		'		'
Net income attributable to noncontrolling interests	488,000		500,000		'		'
Total liabilities and stockholders’ equity	2,420,543,000		2,655,462,000		'		'
Energy Solutions, Inc.	'		'		'		'
Assets	'		'		'		'
Cash and cash equivalents	0		0		0		0
Accounts receivable, net of allowance for doubtful accounts	0		'		'		'
Costs and estimated earnings in excess of billings on uncompleted contracts	0		'		'		'
Nuclear decommissioning trust fund investments, current portion	0		'		'		'
Deferred costs, current portion	0		'		'		'
Other Assets	0		'		'		'
Total current assets	0		6,423,000		'		'
Property, plant and equipment, net	0		0		'		'
Goodwill	0		0		'		'
Intangibles, net	0		0		'		'
Restricted cash	0		0		'		'
Nuclear decommissioning trust fund	0		0		'		'
Deferred income taxes	29,707,000		'		'		'
Long-term deferred costs less current portion	0		0		'		'
Investment in subsidiaries	-65,095,000		-9,554,000		'		'
Intercompany receivable	333,300,000		303,550,000		'		'
Other long term assets	0		0		'		'
Total assets	297,912,000		300,419,000		'		'
Liabilities and Stockholders’ Equity	'		'		'		'
Accounts payable	0		'		'		'
Accrued expenses and other current liabilities	477,000		'		'		'
Unearned revenue, current portion	0		'		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	0		'		'		'
Other Liabilities, Current	19,261,000		'		'		'
Intercompany payable	0		0		'		'
Total current liabilities	19,738,000		0		'		'
Intercompany loan payable	0		0		'		'
Long-term debt, less current portion	0		0		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	0		0		'		'
Unearned revenue, less current portion	0		0		'		'
Other liabilities, net	10,447,000		0		'		'
Stockholders' equity	267,727,000		300,419,000		'		'
Net income attributable to noncontrolling interests	0		0		'		'
Total liabilities and stockholders’ equity	297,912,000		300,419,000		'		'
EnergySolutions, LLC	'		'		'		'
Assets	'		'		'		'
Cash and cash equivalents	33,556,000		93,080,000		694,000		18,588,000
Accounts receivable, net of allowance for doubtful accounts	13,793,000		'		'		'
Costs and estimated earnings in excess of billings on uncompleted contracts	9,884,000		'		'		'
Nuclear decommissioning trust fund investments, current portion	0		'		'		'
Deferred costs, current portion	0		'		'		'
Other Assets	6,548,000		'		'		'
Total current assets	63,781,000		128,479,000		'		'
Property, plant and equipment, net	52,149,000		60,657,000		'		'
Goodwill	29,764,000		29,765,000		'		'
Intangibles, net	151,580,000		160,198,000		'		'
Restricted cash	89,537,000		110,471,000		'		'
Nuclear decommissioning trust fund	0		0		'		'
Deferred income taxes	0		'		'		'
Long-term deferred costs less current portion	0		0		'		'
Investment in subsidiaries	693,474,000		616,038,000		'		'
Intercompany receivable	0		0		'		'
Other long term assets	11,275,000		10,884,000		'		'
Total assets	1,091,560,000		1,116,492,000		'		'
Liabilities and Stockholders’ Equity	'		'		'		'
Accounts payable	5,198,000		'		'		'
Accrued expenses and other current liabilities	56,788,000		'		'		'
Unearned revenue, current portion	2,229,000		'		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	0		'		'		'
Other Liabilities, Current	65,000,000		'		'		'
Intercompany payable	0		0		'		'
Total current liabilities	129,215,000		88,815,000		'		'
Intercompany loan payable	513,136,000		401,015,000		'		'
Long-term debt, less current portion	469,260,000		601,836,000		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	30,375,000		31,206,000		'		'
Unearned revenue, less current portion	0		0		'		'
Other liabilities, net	14,669,000		3,174,000		'		'
Stockholders' equity	-65,095,000		-9,554,000		'		'
Net income attributable to noncontrolling interests	0		0		'		'
Total liabilities and stockholders’ equity	1,091,560,000		1,116,492,000		'		'
Guarantor Subsidiaries	'		'		'		'
Assets	'		'		'		'
Cash and cash equivalents	872,000		3,371,000		0		11,048,000
Accounts receivable, net of allowance for doubtful accounts	47,034,000		'		'		'
Costs and estimated earnings in excess of billings on uncompleted contracts	41,993,000		'		'		'
Nuclear decommissioning trust fund investments, current portion	0		'		'		'
Deferred costs, current portion	333,000		'		'		'
Other Assets	4,402,000		'		'		'
Total current assets	94,634,000		115,603,000		'		'
Property, plant and equipment, net	60,269,000		54,112,000		'		'
Goodwill	223,506,000		223,506,000		'		'
Intangibles, net	21,210,000		31,186,000		'		'
Restricted cash	3,821,000		5,867,000		'		'
Nuclear decommissioning trust fund	0		0		'		'
Deferred income taxes	0		'		'		'
Long-term deferred costs less current portion	0		0		'		'
Investment in subsidiaries	0		0		'		'
Intercompany receivable	193,465,000		108,032,000		'		'
Other long term assets	17,955,000		16,450,000		'		'
Total assets	614,860,000		554,756,000		'		'
Liabilities and Stockholders’ Equity	'		'		'		'
Accounts payable	16,027,000		'		'		'
Accrued expenses and other current liabilities	35,075,000		'		'		'
Unearned revenue, current portion	23,296,000		'		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	0		'		'		'
Other Liabilities, Current	0		'		'		'
Intercompany payable	5,215,000		1,441,000		'		'
Total current liabilities	79,613,000		67,198,000		'		'
Intercompany loan payable	0		0		'		'
Long-term debt, less current portion	0		0		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	36,981,000		39,358,000		'		'
Unearned revenue, less current portion	0		0		'		'
Other liabilities, net	1,944,000		1,051,000		'		'
Stockholders' equity	496,322,000		445,708,000		'		'
Net income attributable to noncontrolling interests	0		0		'		'
Total liabilities and stockholders’ equity	614,860,000		554,756,000		'		'
Non-Guarantor Subsidiaries	'		'		'		'
Assets	'		'		'		'
Cash and cash equivalents	49,785,000		37,740,000		76,519,000		30,556,000
Accounts receivable, net of allowance for doubtful accounts	229,138,000		'		'		'
Costs and estimated earnings in excess of billings on uncompleted contracts	36,820,000		'		'		'
Nuclear decommissioning trust fund investments, current portion	112,475,000		'		'		'
Deferred costs, current portion	91,508,000		'		'		'
Other Assets	4,918,000		'		'		'
Total current assets	524,644,000		545,483,000		'		'
Property, plant and equipment, net	2,058,000		2,975,000		'		'
Goodwill	56,238,000		55,337,000		'		'
Intangibles, net	41,571,000		48,167,000		'		'
Restricted cash	200,538,000		200,416,000		'		'
Nuclear decommissioning trust fund	330,442,000		445,989,000		'		'
Deferred income taxes	0		'		'		'
Long-term deferred costs less current portion	270,039,000		360,185,000		'		'
Investment in subsidiaries	0		0		'		'
Intercompany receivable	8,997,000		1,302,000		'		'
Other long term assets	151,084,000		44,762,000		'		'
Total assets	1,585,611,000		1,704,616,000		'		'
Liabilities and Stockholders’ Equity	'		'		'		'
Accounts payable	124,632,000		'		'		'
Accrued expenses and other current liabilities	116,306,000		'		'		'
Unearned revenue, current portion	92,515,000		'		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	98,175,000		'		'		'
Other Liabilities, Current	11,102,000		'		'		'
Intercompany payable	22,626,000		11,869,000		'		'
Total current liabilities	465,356,000		488,779,000		'		'
Intercompany loan payable	0		0		'		'
Long-term debt, less current portion	197,554,000		196,741,000		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	311,033,000		414,883,000		'		'
Unearned revenue, less current portion	272,940,000		366,710,000		'		'
Other liabilities, net	141,088,000		54,804,000		'		'
Stockholders' equity	197,152,000		170,330,000		'		'
Net income attributable to noncontrolling interests	488,000		500,000		'		'
Total liabilities and stockholders’ equity	1,585,611,000		1,704,616,000		'		'
Eliminations	'		'		'		'
Assets	'		'		'		'
Cash and cash equivalents	0		0		0		0
Accounts receivable, net of allowance for doubtful accounts	-2,527,000		'		'		'
Costs and estimated earnings in excess of billings on uncompleted contracts	-2,732,000		'		'		'
Nuclear decommissioning trust fund investments, current portion	0		'		'		'
Deferred costs, current portion	0		'		'		'
Other Assets	0		'		'		'
Total current assets	-5,259,000		-1,453,000		'		'
Property, plant and equipment, net	0		0		'		'
Goodwill	0		0		'		'
Intangibles, net	0		0		'		'
Restricted cash	0		0		'		'
Nuclear decommissioning trust fund	0		0		'		'
Deferred income taxes	0		'		'		'
Long-term deferred costs less current portion	0		0		'		'
Investment in subsidiaries	-628,379,000		-606,484,000		'		'
Intercompany receivable	-535,762,000		-412,884,000		'		'
Other long term assets	0		0		'		'
Total assets	-1,169,400,000		-1,020,821,000		'		'
Liabilities and Stockholders’ Equity	'		'		'		'
Accounts payable	0		'		'		'
Accrued expenses and other current liabilities	-469,000		'		'		'
Unearned revenue, current portion	425,000		'		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	0		'		'		'
Other Liabilities, Current	0		'		'		'
Intercompany payable	-27,841,000		-13,310,000		'		'
Total current liabilities	-27,885,000		-12,000		'		'
Intercompany loan payable	-513,136,000		-401,015,000		'		'
Long-term debt, less current portion	0		0		'		'
Facility and equipment decontamination and decommissioning liabilities, current portion	0		0		'		'
Unearned revenue, less current portion	0		0		'		'
Other liabilities, net	0		0		'		'
Stockholders' equity	-628,379,000		-606,484,000		'		'
Net income attributable to noncontrolling interests	0		0		'		'
Total liabilities and stockholders’ equity	($1,169,400,000)		($1,020,821,000)		'		'
[1]	Corporate unallocated assets relate primarily to income tax receivables, deferred tax assets, deferred financing costs, prepaid expenses, and property, plant and equipment that benefit the entire Company and cash

Guarantor_and_NonGuarantor_Fin4

Guarantor and Non-Guarantor Financial Information (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities	'	'	'
Net cash provided by (used in) operating activities	$26,140	$67,636	$75,540
Cash flows from investing activities	'	'	'
Purchase of nuclear decommissioning trust fund investments	-884,481	-877,723	-1,072,139
Proceeds from sales of nuclear decommissioning trust fund investments	888,916	881,672	1,076,635
Purchases of property, plant and equipment	-15,199	-20,345	-23,734
Purchases of intangible assets	0	-763	-610
Acquisition of noncontrolling interest on subsidiary	0	0	-2,486
Proceeds from disposition of property, plant and equipment	49	5,336	236
Net cash used in investing activities	-10,715	-11,823	-22,098
Cash flows from financing activities	'	'	'
Repayments of long-term debt	-87,000	0	-30,200
Intercompany loan receivable	0	0	0
Intercompany loan payable	'	0	0
Investment in subsidiary	0	0	0
Distributions to noncontrolling interests partners	0	-158	-4,204
Proceeds from issuance of common stock	0	1,497	0
Restricted cash held as collateral of letter of credit obligations	21,000	0	0
Proceeds from revolver credit facility	5,000	0	0
Payments on revolver credit facility	-5,000	0	0
Debt financing fees	-4,535	0	0
Capital contribution	14,407	'	'
Minimum tax withholding on restricted stock awards	-432	-120	-116
Proceeds from exercise of stock options	0	0	57
Repurchase of common stock	-7,342	0	0
Repayments of capital lease obligations	-844	-654	-695
Net cash (used in) provided by financing activities	-64,746	565	-35,158
Effect of exchange rate on cash	-657	600	-1,263
Net increase (decrease) in cash and cash equivalents	-49,978	56,978	17,021
Cash and cash equivalents, beginning of period	134,191	77,213	60,192
Cash and cash equivalents, end of period	84,213	134,191	77,213
Energy Solutions, Inc.	'	'	'
Cash flows from operating activities	'	'	'
Net cash provided by (used in) operating activities	-43,276	14,994	-244,990
Cash flows from investing activities	'	'	'
Purchase of nuclear decommissioning trust fund investments	0	0	0
Proceeds from sales of nuclear decommissioning trust fund investments	0	0	0
Purchases of property, plant and equipment	0	0	0
Purchases of intangible assets	'	0	0
Acquisition of noncontrolling interest on subsidiary	'	'	0
Proceeds from disposition of property, plant and equipment	0	0	0
Net cash used in investing activities	0	0	0
Cash flows from financing activities	'	'	'
Repayments of long-term debt	0	'	0
Intercompany loan receivable	-18,898	-5,963	-11,676
Intercompany loan payable	'	0	0
Investment in subsidiary	55,541	-10,408	259,583
Distributions to noncontrolling interests partners	'	0	0
Proceeds from issuance of common stock	'	1,497	'
Restricted cash held as collateral of letter of credit obligations	0	'	'
Proceeds from revolver credit facility	0	'	'
Payments on revolver credit facility	0	'	'
Debt financing fees	0	'	'
Capital contribution	14,407	'	'
Minimum tax withholding on restricted stock awards	-432	-120	-116
Proceeds from exercise of stock options	'	'	57
Repurchase of common stock	-7,342	'	'
Repayments of capital lease obligations	0	0	0
Net cash (used in) provided by financing activities	43,276	-14,994	247,848
Effect of exchange rate on cash	0	0	-2,858
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	0	0	0
EnergySolutions, LLC	'	'	'
Cash flows from operating activities	'	'	'
Net cash provided by (used in) operating activities	-14,779	56,441	-95,711
Cash flows from investing activities	'	'	'
Purchase of nuclear decommissioning trust fund investments	0	0	0
Proceeds from sales of nuclear decommissioning trust fund investments	0	0	0
Purchases of property, plant and equipment	-581	-5,428	-7,995
Purchases of intangible assets	'	0	-610
Acquisition of noncontrolling interest on subsidiary	'	'	-1,967
Proceeds from disposition of property, plant and equipment	43	0	0
Net cash used in investing activities	-538	-5,428	-10,572
Cash flows from financing activities	'	'	'
Repayments of long-term debt	-87,000	'	-30,200
Intercompany loan receivable	102,782	31,078	-39,088
Intercompany loan payable	'	103,430	88,072
Investment in subsidiary	-77,435	-92,481	73,158
Distributions to noncontrolling interests partners	'	0	0
Proceeds from issuance of common stock	'	0	'
Restricted cash held as collateral of letter of credit obligations	21,000	'	'
Proceeds from revolver credit facility	5,000	'	'
Payments on revolver credit facility	-5,000	'	'
Debt financing fees	-2,710	'	'
Capital contribution	0	'	'
Minimum tax withholding on restricted stock awards	0	0	0
Proceeds from exercise of stock options	'	'	0
Repurchase of common stock	0	'	'
Repayments of capital lease obligations	-844	-654	-695
Net cash (used in) provided by financing activities	-44,207	41,373	91,247
Effect of exchange rate on cash	0	0	-2,858
Net increase (decrease) in cash and cash equivalents	-59,524	92,386	-17,894
Cash and cash equivalents, beginning of period	93,080	694	18,588
Cash and cash equivalents, end of period	33,556	93,080	694
Guarantor Subsidiaries	'	'	'
Cash flows from operating activities	'	'	'
Net cash provided by (used in) operating activities	106,447	104,932	95,135
Cash flows from investing activities	'	'	'
Purchase of nuclear decommissioning trust fund investments	0	0	0
Proceeds from sales of nuclear decommissioning trust fund investments	0	0	0
Purchases of property, plant and equipment	-14,305	-13,084	-14,970
Purchases of intangible assets	'	-763	0
Acquisition of noncontrolling interest on subsidiary	'	'	0
Proceeds from disposition of property, plant and equipment	0	5,336	236
Net cash used in investing activities	-14,305	-8,511	-14,734
Cash flows from financing activities	'	'	'
Repayments of long-term debt	0	'	0
Intercompany loan receivable	-94,641	-86,274	-23,060
Intercompany loan payable	'	0	-68,389
Investment in subsidiary	0	-6,776	0
Distributions to noncontrolling interests partners	'	0	0
Proceeds from issuance of common stock	'	0	'
Restricted cash held as collateral of letter of credit obligations	0	'	'
Proceeds from revolver credit facility	0	'	'
Payments on revolver credit facility	0	'	'
Debt financing fees	0	'	'
Capital contribution	0	'	'
Minimum tax withholding on restricted stock awards	0	0	0
Proceeds from exercise of stock options	'	'	0
Repurchase of common stock	0	'	'
Repayments of capital lease obligations	0	0	0
Net cash (used in) provided by financing activities	-94,641	-93,050	-91,449
Effect of exchange rate on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	-2,499	3,371	-11,048
Cash and cash equivalents, beginning of period	3,371	0	11,048
Cash and cash equivalents, end of period	872	3,371	0
Non-Guarantor Subsidiaries	'	'	'
Cash flows from operating activities	'	'	'
Net cash provided by (used in) operating activities	10,399	-9,636	47,534
Cash flows from investing activities	'	'	'
Purchase of nuclear decommissioning trust fund investments	-884,481	-877,723	-1,072,139
Proceeds from sales of nuclear decommissioning trust fund investments	888,916	881,672	1,076,635
Purchases of property, plant and equipment	-313	-1,833	-769
Purchases of intangible assets	'	0	0
Acquisition of noncontrolling interest on subsidiary	'	'	-519
Proceeds from disposition of property, plant and equipment	6	0	0
Net cash used in investing activities	4,128	2,116	3,208
Cash flows from financing activities	'	'	'
Repayments of long-term debt	0	'	0
Intercompany loan receivable	0	0	0
Intercompany loan payable	'	0	0
Investment in subsidiary	0	-31,701	0
Distributions to noncontrolling interests partners	'	-158	-4,204
Proceeds from issuance of common stock	'	0	'
Restricted cash held as collateral of letter of credit obligations	0	'	'
Proceeds from revolver credit facility	0	'	'
Payments on revolver credit facility	0	'	'
Debt financing fees	-1,825	'	'
Capital contribution	0	'	'
Minimum tax withholding on restricted stock awards	0	0	0
Proceeds from exercise of stock options	'	'	0
Repurchase of common stock	0	'	'
Repayments of capital lease obligations	0	0	0
Net cash (used in) provided by financing activities	-1,825	-31,859	-4,204
Effect of exchange rate on cash	-657	600	-575
Net increase (decrease) in cash and cash equivalents	12,045	-38,779	45,963
Cash and cash equivalents, beginning of period	37,740	76,519	30,556
Cash and cash equivalents, end of period	49,785	37,740	76,519
Eliminations	'	'	'
Cash flows from operating activities	'	'	'
Net cash provided by (used in) operating activities	-32,651	-99,095	273,572
Cash flows from investing activities	'	'	'
Purchase of nuclear decommissioning trust fund investments	0	0	0
Proceeds from sales of nuclear decommissioning trust fund investments	0	0	0
Purchases of property, plant and equipment	0	0	0
Purchases of intangible assets	'	0	0
Acquisition of noncontrolling interest on subsidiary	'	'	0
Proceeds from disposition of property, plant and equipment	0	0	0
Net cash used in investing activities	0	0	0
Cash flows from financing activities	'	'	'
Repayments of long-term debt	0	'	0
Intercompany loan receivable	10,757	61,159	73,824
Intercompany loan payable	'	-103,430	-19,683
Investment in subsidiary	21,894	141,366	-332,741
Distributions to noncontrolling interests partners	'	0	0
Proceeds from issuance of common stock	'	0	'
Restricted cash held as collateral of letter of credit obligations	0	'	'
Proceeds from revolver credit facility	0	'	'
Payments on revolver credit facility	0	'	'
Debt financing fees	0	'	'
Capital contribution	0	'	'
Minimum tax withholding on restricted stock awards	0	0	0
Proceeds from exercise of stock options	'	'	0
Repurchase of common stock	0	'	'
Repayments of capital lease obligations	0	0	0
Net cash (used in) provided by financing activities	32,651	99,095	-278,600
Effect of exchange rate on cash	0	0	5,028
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	$0	$0	$0