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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The Company's revenue by client markets, type, and contract mix are in the following tables. Certain immaterial revenue amounts in the prior years have been reclassified due to minor adjustments and reclassification.
| Year ended December 31, |
| 2023 |  |  | 2022 |  |  | 2021 |
Client Markets: |  |  |  |  |  |  |  |
Energy, environment, infrastructure, and disaster recovery | $ | 806,482 |  |  | $ | 714,628 |  |  | $ | 693,572 |
Health and social programs |  | 814,454 |  |  |  | 704,465 |  |  |  | 563,590 |
Security and other civilian & commercial |  | 342,302 |  |  |  | 360,871 |  |  |  | 295,886 |
Total | $ | 1,963,238 |  |  | $ | 1,779,964 |  |  | $ | 1,553,048 |
| Year ended December 31, |
| 2023 |  |  | 2022 |  |  | 2021 |
Client Type: |  |  |  |  |  |  |  |
U.S. federal government | $ | 1,084,043 |  |  | $ | 980,746 |  |  | $ | 735,032 |
U.S. state and local government |  | 308,134 |  |  |  | 259,764 |  |  |  | 235,416 |
International government |  | 103,399 |  |  |  | 103,609 |  |  |  | 139,229 |
Total Government |  | 1,495,576 |  |  |  | 1,344,119 |  |  |  | 1,109,677 |
Commercial |  | 467,662 |  |  |  | 435,845 |  |  |  | 443,371 |
Total | $ | 1,963,238 |  |  | $ | 1,779,964 |  |  | $ | 1,553,048 |
| Year ended December 31, |
| 2023 |  |  | 2022 |  |  | 2021 |
Contract Mix: |  |  |  |  |  |  |  |
Time-and-materials | $ | 812,430 |  |  | $ | 713,693 |  |  | $ | 633,135 |
Fixed-price |  | 885,465 |  |  |  | 802,568 |  |  |  | 645,809 |
Cost-based |  | 265,343 |  |  |  | 263,703 |  |  |  | 274,104 |
Total | $ | 1,963,238 |  |  | $ | 1,779,964 |  |  | $ | 1,553,048 |
Schedule of Contract Assets and Liabilities and Changes in Contract Balances | Contract Assets and Liabilities: Contract assets consist of unbilled receivables on contracts where revenue recognized exceeds the amount billed. Contract liabilities result from advance payments received on a contract or from billings in excess of revenue recognized on long-term contracts. The following table summarizes the contract balances as of December 31, 2023 and December 31, 2022:
| December 31, 2023 |  |  | December 31, 2022 |  |  | Change |
Contract assets | $ | 201,832 |  |  | $ | 169,088 |  |  | $ | 32,744 |
Contract liabilities |  | (21,997 | ) |  |  | (25,773 | ) |  |  | 3,776 |
Net contract assets (liabilities) | $ | 179,835 |  |  | $ | 143,315 |  |  | $ | 36,520 |
The net contract assets (liabilities) as of December 31, 2023 increased by $36.5 million as compared to December 31, 2022, primarily due to the timing difference between the performance of services and billings to and payments from customers. There were no material changes to contract balances due to impairments or credit losses during the period. During the years ended December 31, 2023 and 2022, the Company recognized $17.8 million and $27.4 million in revenue related to the contract liabilities balance at December 31, 2022 and 2021, respectively. Unfulfilled

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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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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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