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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 764,039 | $ 681,465 | $ 1,446,297 | $ 1,285,431
Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 224,170 | 363,157 | 437,049 | 665,930
Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 377,518 | 149,533 | 725,320 | 311,658
Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 109,107 | 102,083 | 199,896 | 195,798
Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 54,303 | 67,564 | 86,430 | 113,110
Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 739,528 | 650,031 | 1,393,295 | 1,231,174
Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,570 | 32,306 | 55,400 | 55,322
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 765,098 | 682,337 | 1,448,695 | 1,286,496
Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 588,959 | 540,846 | 1,144,246 | 1,027,967
Operating Segments | Government Operations | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 220,653 | 357,737 | 429,205 | 654,988
Operating Segments | Government Operations | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 259,153 | 81,026 | 515,015 | 175,946
Operating Segments | Government Operations | Cost-Plus Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 109,107 | 102,083 | 199,896 | 195,798
Operating Segments | Government Operations | Time-and-Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 46 | 0 | 130 | 1,235
Operating Segments | Government Operations | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 586,443 | 537,906 | 1,136,989 | 1,022,194
Operating Segments | Government Operations | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,516 | 2,940 | 7,257 | 5,773
Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 176,139 | 141,491 | 304,449 | 258,529
Operating Segments | Commercial Operations | Fixed-Price Incentive Fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,517 | 5,420 | 7,844 | 10,942
Operating Segments | Commercial Operations | Firm-Fixed-Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 118,365 | 68,507 | 210,305 | 135,712
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 | 54,257 | 67,564 | 86,300 | 111,875
Operating Segments | Commercial Operations | Over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 153,085 | 112,125 | 256,306 | 208,980
Operating Segments | Commercial Operations | Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 23,054 | 29,366 | 48,143 | 49,549
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (1,059) | (872) | (2,398) | (1,065)
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 608,474 | 549,778 | 1,174,104 | 1,050,415
United States | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 583,622 | 533,715 | 1,133,190 | 1,017,557
United States | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,852 | 16,063 | 40,914 | 32,858
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 141,236 | 120,690 | 243,012 | 215,721
Canada | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 75 | 174 | 234 | 193
Canada | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 141,161 | 120,516 | 242,778 | 215,528
Other: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,388 | 11,869 | 31,579 | 20,360
Other: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,262 | 6,957 | 10,822 | 10,217
Other: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,126 | 4,912 | 20,757 | 10,143
Government | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 513,749 | 511,498 | 1,039,044 | 973,730
Government | United States | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 513,749 | 511,498 | 1,039,044 | 973,730
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 | 10 | 23 | 112 | 25
Government | Canada | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10 | 23 | 112 | 25
Government | Canada | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Government | Other: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,725 | 637 | 7,596 | 1,663
Government | Other: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,725 | 637 | 7,596 | 1,663
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 | 94,725 | 38,280 | 135,060 | 76,685
Non-Government | United States | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 69,873 | 22,217 | 94,146 | 43,827
Non-Government | United States | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,852 | 16,063 | 40,914 | 32,858
Non-Government | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 141,226 | 120,667 | 242,900 | 215,696
Non-Government | Canada | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 65 | 151 | 122 | 168
Non-Government | Canada | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 141,161 | 120,516 | 242,778 | 215,528
Non-Government | Other: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,663 | 11,232 | 23,983 | 18,697
Non-Government | Other: | Operating Segments | Government Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,537 | 6,320 | 3,226 | 8,554
Non-Government | Other: | Operating Segments | Commercial Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 10,126 | $ 4,912 | $ 20,757 | $ 10,143

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