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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 612,445 | $ 554,208 | $ 1,180,805 | $ 1,084,946
Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 329,874 | 326,917 | 626,217 | 630,889
Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 154,893 | 136,023 | 321,163 | 297,571
Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 86,410 | 49,970 | 159,225 | 95,488
Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 41,710 | 42,149 | 75,092 | 62,838
Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 581,494 | 541,117 | 1,132,257 | 1,058,781
Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31,393 | 13,942 | 49,440 | 28,005
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 612,887 | 555,059 | 1,181,697 | 1,086,786
Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 491,967 | 436,537 | 951,853 | 868,314
Operating Segments | Government Operations | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 327,270 | 324,948 | 619,429 | 626,373
Operating Segments | Government Operations | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 77,323 | 60,672 | 172,041 | 144,238
Operating Segments | Government Operations | Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 86,410 | 49,970 | 159,225 | 95,488
Operating Segments | Government Operations | Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 964 | 947 | 1,158 | 2,215
Operating Segments | Government Operations | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 486,730 | 436,537 | 941,541 | 868,286
Operating Segments | Government Operations | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,237 | 0 | 10,312 | 28
Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 120,920 | 118,522 | 229,844 | 218,472
Operating Segments | Commercial Operations | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,604 | 1,969 | 6,788 | 4,516
Operating Segments | Commercial Operations | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 77,570 | 75,351 | 149,122 | 153,333
Operating Segments | Commercial Operations | Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Commercial Operations | Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,746 | 41,202 | 73,934 | 60,623
Operating Segments | Commercial Operations | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 94,764 | 104,580 | 190,716 | 190,495
Operating Segments | Commercial Operations | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26,156 | 13,942 | 39,128 | 27,977
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (442) | (851) | (892) | (1,840)
Eliminations | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (388) | (851) | (788) | (1,774)
Eliminations | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (54) | 0 | (104) | (66)
United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 502,333 | 441,885 | 968,881 | 878,904
United States: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 487,415 | 433,029 | 942,685 | 862,834
United States: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,918 | 8,856 | 26,196 | 16,070
Canada: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100,515 | 103,598 | 193,793 | 194,974
Canada: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 422 | 841 | 681 | 1,819
Canada: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100,093 | 102,757 | 193,112 | 193,155
Other: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,039 | 9,576 | 19,023 | 12,908
Other: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,130 | 2,667 | 8,487 | 3,661
Other: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,909 | 6,909 | 10,536 | 9,247
Government | United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 459,334 | 410,793 | 890,912 | 817,040
Government | United States: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 459,334 | 410,793 | 890,912 | 817,040
Government | United States: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Government | Canada: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 37 | 0 | 88 | 0
Government | Canada: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 37 | 0 | 88 | 0
Government | Canada: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Government | Other: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,155 | 725 | 2,303 | 725
Government | Other: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,155 | 725 | 2,303 | 725
Government | Other: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Non-Government | United States: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,999 | 31,092 | 77,969 | 61,864
Non-Government | United States: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,081 | 22,236 | 51,773 | 45,794
Non-Government | United States: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,918 | 8,856 | 26,196 | 16,070
Non-Government | Canada: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100,478 | 103,598 | 193,705 | 194,974
Non-Government | Canada: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 385 | 841 | 593 | 1,819
Non-Government | Canada: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100,093 | 102,757 | 193,112 | 193,155
Non-Government | Other: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,884 | 8,851 | 16,720 | 12,183
Non-Government | Other: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,975 | 1,942 | 6,184 | 2,936
Non-Government | Other: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 5,909 | $ 6,909 | $ 10,536 | $ 9,247

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