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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The Company disaggregates revenue from clients into categories that depict how the nature, amount, and uncertainty of revenue and cash flows are affected by economic and business factors. Those categories are client market, client type, and contract mix.
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |
Client Market: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy, environment, infrastructure, and disaster recovery |  | $ | 246,239 |  |  |  | 53 | % |  | $ | 237,056 |  |  |  | 46 | % |  | $ | 732,182 |  |  |  | 51 | % |  | $ | 694,940 |  |  |  | 46 | %
Health and social programs |  |  | 151,976 |  |  |  | 33 | % |  |  | 196,772 |  |  |  | 38 | % |  |  | 480,489 |  |  |  | 34 | % |  |  | 583,415 |  |  |  | 38 | %
Security and other civilian & commercial |  |  | 67,190 |  |  |  | 14 | % |  |  | 83,170 |  |  |  | 16 | % |  |  | 216,507 |  |  |  | 15 | % |  |  | 245,108 |  |  |  | 16 | %
Total |  | $ | 465,405 |  |  |  | 100 | % |  | $ | 516,998 |  |  |  | 100 | % |  | $ | 1,429,178 |  |  |  | 100 | % |  | $ | 1,523,463 |  |  |  | 100 | %
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |
Client Type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal government |  | $ | 198,042 |  |  |  | 43 | % |  | $ | 281,970 |  |  |  | 55 | % |  | $ | 641,240 |  |  |  | 45 | % |  | $ | 830,070 |  |  |  | 55 | %
U.S. state and local government |  |  | 81,698 |  |  |  | 17 | % |  |  | 78,686 |  |  |  | 15 | % |  |  | 244,491 |  |  |  | 17 | % |  |  | 240,801 |  |  |  | 16 | %
International government |  |  | 29,021 |  |  |  | 6 | % |  |  | 26,817 |  |  |  | 5 | % |  |  | 85,369 |  |  |  | 6 | % |  |  | 80,760 |  |  |  | 5 | %
Total Government |  |  | 308,761 |  |  |  | 66 | % |  |  | 387,473 |  |  |  | 75 | % |  |  | 971,100 |  |  |  | 68 | % |  |  | 1,151,631 |  |  |  | 76 | %
Commercial |  |  | 156,644 |  |  |  | 34 | % |  |  | 129,525 |  |  |  | 25 | % |  |  | 458,078 |  |  |  | 32 | % |  |  | 371,832 |  |  |  | 24 | %
Total |  | $ | 465,405 |  |  |  | 100 | % |  | $ | 516,998 |  |  |  | 100 | % |  | $ | 1,429,178 |  |  |  | 100 | % |  | $ | 1,523,463 |  |  |  | 100 | %
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |
Contract Mix: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time-and-materials |  | $ | 205,683 |  |  |  | 44 | % |  | $ | 220,332 |  |  |  | 43 | % |  | $ | 621,422 |  |  |  | 43 | % |  | $ | 644,125 |  |  |  | 42 | %
Fixed-price |  |  | 226,781 |  |  |  | 49 | % |  |  | 236,770 |  |  |  | 46 | % |  |  | 703,321 |  |  |  | 49 | % |  |  | 696,910 |  |  |  | 46 | %
Cost-based |  |  | 32,941 |  |  |  | 7 | % |  |  | 59,896 |  |  |  | 11 | % |  |  | 104,435 |  |  |  | 8 | % |  |  | 182,428 |  |  |  | 12 | %
Total |  | $ | 465,405 |  |  |  | 100 | % |  | $ | 516,998 |  |  |  | 100 | % |  | $ | 1,429,178 |  |  |  | 100 | % |  | $ | 1,523,463 |  |  |  | 100 | %
Schedule of Contract Assets and Liabilities | The following table summarizes the contract assets and liabilities as of September 30, 2025 and December 31, 2024:
|  | September 30, 2025 |  |  | December 31, 2024 |
Contract assets |  | $ | 225,946 |  |  | $ | 188,941 |
Contract liabilities (1) |  |  | (37,653 | ) |  |  | (24,580 | )
Net contract assets (liabilities) |  | $ | 188,293 |  |  | $ | 164,361 |
(1) Contract liabilities as of September 30, 2025 include $3.0 million of long-term contract liabilities that is part of "Other long-term liabilities" on the Company's consolidated balance sheets.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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