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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									2,153,218	2,154,019	1,912,566
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(29,144)	(30,503)	(17,646)
Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,254,195	1,228,348	1,140,394
Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									617,007	635,024	518,808
Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									177,986	206,799	183,222
Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									104,030	83,848	70,142
Over time
Disaggregation of Revenue [Line Items]
Revenues									2,101,477	2,105,330	1,864,762
Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									51,741	48,689	47,804
UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,779,640	1,806,810	1,587,558
UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,642,169	1,653,331	1,479,791
UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									137,471	153,479	107,767
CANADA | Non-Government
Disaggregation of Revenue [Line Items]
Revenues									348,829	313,790	290,144
Other | Non-Government
Disaggregation of Revenue [Line Items]
Revenues									24,749	33,419	34,864
Nuclear Services Group
Disaggregation of Revenue [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Services Group | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Services Group | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(22,964)	(26,159)	(13,056)
Nuclear Services Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Services Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									38,151	32,334	26,163
Nuclear Services Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									73,621	94,320	102,726
Nuclear Services Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									11,766	9,839	2,450
Nuclear Services Group | Over time
Disaggregation of Revenue [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Services Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Services Group | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									120,025	132,136	129,143
Nuclear Services Group | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									114,465	113,075	111,236
Nuclear Services Group | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									5,560	19,061	17,907
Nuclear Services Group | CANADA | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									3,417	4,357	2,196
Nuclear Services Group | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									96	0	0
Nuclear Power Group
Disaggregation of Revenue [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Power Group | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Power Group | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(778)	(553)	(208)
Nuclear Power Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									9,279	1,578	2,511
Nuclear Power Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									307,200	296,394	282,014
Nuclear Power Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									0	0	755
Nuclear Power Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									90,603	73,297	67,360
Nuclear Power Group | Over time
Disaggregation of Revenue [Line Items]
Revenues									355,477	322,745	305,075
Nuclear Power Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									51,605	48,524	47,565
Nuclear Power Group | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									44,102	35,432	38,058
Nuclear Power Group | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Power Group | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									44,102	35,432	38,058
Nuclear Power Group | CANADA | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									345,412	309,433	287,948
Nuclear Power Group | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									17,568	26,404	26,634
Nuclear Operations Group
Disaggregation of Revenue [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Nuclear Operations Group | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Nuclear Operations Group | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(5,402)	(3,791)	(4,382)
Nuclear Operations Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,244,916	1,226,770	1,137,883
Nuclear Operations Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									271,656	306,296	210,631
Nuclear Operations Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									104,365	112,479	79,741
Nuclear Operations Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									1,661	712	332
Nuclear Operations Group | Over time
Disaggregation of Revenue [Line Items]
Revenues									1,622,462	1,646,092	1,428,348
Nuclear Operations Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									136	165	239
Nuclear Operations Group | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,615,513	1,639,242	1,420,357
Nuclear Operations Group | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,527,704	1,540,256	1,368,555
Nuclear Operations Group | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									87,809	98,986	51,802
Nuclear Operations Group | CANADA | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Operations Group | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									$ 7,085	$ 7,015	$ 8,230

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