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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 956,050 | $ 1,004,236 | $ 2,710,103 | $ 2,954,688
Federal Solution Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 499,291 | 498,156 | 1,394,035 | 1,457,937
Federal Solution Segment | Defense And Intelligence |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 343,151 | 333,289 | 962,642 | 953,755
Federal Solution Segment | Engineered Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 156,140 | 164,867 | 431,393 | 504,182
Critical Infrastructure |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 456,759 | 506,080 | 1,316,068 | 1,496,751
Critical Infrastructure | Connected Communities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 91,902 | 116,366 | 263,106 | 316,626
Critical Infrastructure | Mobility Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 364,857 | $ 389,714 | $ 1,052,962 | $ 1,180,125

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