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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 624,177	$ 523,711	$ 554,208	$ 530,738	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 2,232,834	$ 2,124,074	$ 2,123,516
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									2,235,841	2,132,179	2,134,396
Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(3,007)	(8,105)	(10,880)
Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,235,993	1,254,195	1,228,326
Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									634,205	614,852	632,890
Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									244,063	165,519	190,799
Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									121,580	97,613	82,381
Over time
Disaggregation of Revenue [Line Items]
Revenues									2,168,586	2,080,438	2,085,788
Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									67,255	51,741	48,608
UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,825,778	1,758,601	1,787,187
UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,703,005	1,624,078	1,635,399
UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									122,773	134,523	151,788
Canada | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									376,918	348,829	313,790
Canada | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									79	0	0
Canada | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									376,839	348,829	313,790
Other | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									33,145	24,749	33,419
Other | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,356	0	0
Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									31,789	24,749	33,419
Government Operations
Disaggregation of Revenue [Line Items]
Revenues									1,808,483	1,725,097	1,763,127
Government Operations | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,808,483	1,725,097	1,763,127
Government Operations | Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(2,941)	(7,327)	(10,327)
Government Operations | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,226,265	1,244,916	1,226,748
Government Operations | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									334,076	307,652	336,496
Government Operations | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									244,063	165,519	190,799
Government Operations | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									4,079	7,010	9,084
Government Operations | Over time
Disaggregation of Revenue [Line Items]
Revenues									1,798,388	1,724,961	1,763,043
Government Operations | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									10,095	136	84
Government Operations | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,794,658	1,714,499	1,751,755
Government Operations | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,703,005	1,624,078	1,635,399
Government Operations | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									91,653	90,421	116,356
Government Operations | Canada | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									3,213	3,417	4,357
Government Operations | Canada | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									79	0	0
Government Operations | Canada | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									3,134	3,417	4,357
Government Operations | Other | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									10,612	7,181	7,015
Government Operations | Other | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,356	0	0
Government Operations | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									9,256	7,181	7,015
Commercial Operations
Disaggregation of Revenue [Line Items]
Revenues									427,358	407,082	371,269
Commercial Operations | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									427,358	407,082	371,269
Commercial Operations | Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(66)	(778)	(553)
Commercial Operations | Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									9,728	9,279	1,578
Commercial Operations | Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									300,129	307,200	296,394
Commercial Operations | Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Commercial Operations | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									117,501	90,603	73,297
Commercial Operations | Over time
Disaggregation of Revenue [Line Items]
Revenues									370,198	355,477	322,745
Commercial Operations | Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									57,160	51,605	48,524
Commercial Operations | UNITED STATES | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									31,120	44,102	35,432
Commercial Operations | UNITED STATES | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Commercial Operations | UNITED STATES | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									31,120	44,102	35,432
Commercial Operations | Canada | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									373,705	345,412	309,433
Commercial Operations | Canada | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Commercial Operations | Canada | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									373,705	345,412	309,433
Commercial Operations | Other | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									22,533	17,568	26,404
Commercial Operations | Other | Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Commercial Operations | Other | Non-Government | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									$ 22,533	$ 17,568	$ 26,404

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