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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 501,235	$ 506,000	$ 471,231	$ 416,454	$ 2,123,516	$ 1,894,920	$ 1,799,889
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									2,154,019	1,912,566	1,807,519
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(30,503)	(17,646)	(7,630)
Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,228,348	1,140,394	1,057,248
Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									635,024	518,808	471,217
Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									206,799	183,222	177,491
Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									83,848	70,142	101,563
Over time
Disaggregation of Revenue [Line Items]
Revenues									2,105,330	1,864,762	1,776,752
Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									48,689	47,804	30,767
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues									1,780,409	1,572,085	1,446,791
UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,806,810	1,587,558	1,451,633
UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,653,331	1,479,791	1,419,597
UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									153,479	107,767	32,036
Canada
Disaggregation of Revenue [Line Items]
Revenues									309,688	287,971	294,913
Canada | Non-Government
Disaggregation of Revenue [Line Items]
Revenues									313,790	290,144	297,700
Other | Non-Government
Disaggregation of Revenue [Line Items]
Revenues									33,419	34,864	58,186
Nuclear Services Group
Disaggregation of Revenue [Line Items]
Revenues									136,493	131,339	122,438
Nuclear Services Group | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									136,493	131,339	122,438
Nuclear Services Group | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(26,159)	(13,056)	(3,318)
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									32,334	26,163	23,294
Nuclear Services Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									94,320	102,726	96,566
Nuclear Services Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									9,839	2,450	2,578
Nuclear Services Group | Over time
Disaggregation of Revenue [Line Items]
Revenues									136,493	131,339	122,438
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									132,136	129,143	119,542
Nuclear Services Group | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									113,075	111,236	107,711
Nuclear Services Group | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									19,061	17,907	11,831
Nuclear Services Group | Canada | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									4,357	2,196	2,758
Nuclear Services Group | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	138
Nuclear Power Group
Disaggregation of Revenue [Line Items]
Revenues									371,269	352,640	365,911
Nuclear Power Group | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									371,269	352,640	365,911
Nuclear Power Group | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(553)	(208)	(308)
Nuclear Power Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,578	2,511	16,165
Nuclear Power Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									296,394	282,014	252,893
Nuclear Power Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									0	755	45
Nuclear Power Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									73,297	67,360	96,808
Nuclear Power Group | Over time
Disaggregation of Revenue [Line Items]
Revenues									322,745	305,075	335,430
Nuclear Power Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									48,524	47,565	30,481
Nuclear Power Group | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									35,432	38,058	16,059
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									35,432	38,058	16,059
Nuclear Power Group | Canada | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									309,433	287,948	294,781
Nuclear Power Group | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									26,404	26,634	55,071
Nuclear Operations Group
Disaggregation of Revenue [Line Items]
Revenues									1,646,257	1,428,587	1,319,170
Nuclear Operations Group | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,646,257	1,428,587	1,319,170
Nuclear Operations Group | Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(3,791)	(4,382)	(4,004)
Nuclear Operations Group | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,226,770	1,137,883	1,041,083
Nuclear Operations Group | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									306,296	210,631	195,030
Nuclear Operations Group | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									112,479	79,741	80,880
Nuclear Operations Group | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									712	332	2,177
Nuclear Operations Group | Over time
Disaggregation of Revenue [Line Items]
Revenues									1,646,092	1,428,348	1,318,884
Nuclear Operations Group | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									165	239	286
Nuclear Operations Group | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,639,242	1,420,357	1,316,032
Nuclear Operations Group | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,540,256	1,368,555	1,311,886
Nuclear Operations Group | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									98,986	51,802	4,146
Nuclear Operations Group | Canada | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	161
Nuclear Operations Group | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									$ 7,015	$ 8,230	$ 2,977

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