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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 440,433		$ 899,913
Revenues	438,921	$ 410,011	896,384	$ 838,240
Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	263,739		517,007
Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	102,406		229,156
Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	47,536		91,767
Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	26,752		61,983
Over-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	434,060		885,833
Point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,373		14,080
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	364,156		710,105
UNITED STATES | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	356,070		698,582
UNITED STATES | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,086		11,523
CANADA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	65,253		148,553
CANADA | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
CANADA | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	65,253		148,553
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,024		41,255
Other | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Other | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,024		41,255
Nuclear Operations Group
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	332,140		648,771
Nuclear Operations Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	258,150		507,390
Nuclear Operations Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	52,472		99,530
Nuclear Operations Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	21,450		41,683
Nuclear Operations Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	68		168
Nuclear Operations Group | Over-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	332,140		648,771
Nuclear Operations Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Nuclear Services Group
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	32,596		62,629
Nuclear Services Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Nuclear Services Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,632		11,042
Nuclear Services Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	26,086		50,039
Nuclear Services Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	878		1,548
Nuclear Services Group | Over-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	32,596		62,629
Nuclear Services Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Nuclear Power Group
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	75,697		188,513
Nuclear Power Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5,589		9,617
Nuclear Power Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	44,302		118,584
Nuclear Power Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		45
Nuclear Power Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	25,806		60,267
Nuclear Power Group | Over-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	69,324		174,433
Nuclear Power Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,373		14,080
Operating Segments | Nuclear Operations Group
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	332,140		648,771
Revenues	332,140	312,866	648,771	637,947
Operating Segments | Nuclear Operations Group | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	331,745		648,376
Operating Segments | Nuclear Operations Group | UNITED STATES | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	327,896		644,527
Operating Segments | Nuclear Operations Group | UNITED STATES | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,849		3,849
Operating Segments | Nuclear Operations Group | CANADA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Operations Group | CANADA | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Operations Group | CANADA | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Operations Group | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	395		395
Operating Segments | Nuclear Operations Group | Other | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Operations Group | Other | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	395		395
Operating Segments | Nuclear Services Group
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	32,596		62,629
Operating Segments | Nuclear Services Group | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	32,084		61,142
Operating Segments | Nuclear Services Group | UNITED STATES | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	28,174		54,055
Operating Segments | Nuclear Services Group | UNITED STATES | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,910		7,087
Operating Segments | Nuclear Services Group | CANADA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	510		1,485
Operating Segments | Nuclear Services Group | CANADA | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Services Group | CANADA | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	510		1,485
Operating Segments | Nuclear Services Group | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2		2
Operating Segments | Nuclear Services Group | Other | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Services Group | Other | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2		2
Operating Segments | Nuclear Power Group
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	75,697		188,513
Operating Segments | Nuclear Power Group | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	327		587
Operating Segments | Nuclear Power Group | UNITED STATES | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Power Group | UNITED STATES | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	327		587
Operating Segments | Nuclear Power Group | CANADA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	64,743		147,068
Operating Segments | Nuclear Power Group | CANADA | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Power Group | CANADA | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	64,743		147,068
Operating Segments | Nuclear Power Group | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,627		40,858
Operating Segments | Nuclear Power Group | Other | Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0		0
Operating Segments | Nuclear Power Group | Other | Non-Government
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,627		40,858
Adjustments and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(1,512)	(2,209)	(3,529)	(4,589)
Adjustments and Eliminations | Nuclear Operations Group
Disaggregation of Revenue [Line Items]
Revenues	$ (841)	$ (205)	$ (1,980)	$ (400)

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