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v3.20.4

Segments Information - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Revenues | $ 964,258 | $ 1,004,236 | $ 979,459 | $ 970,993 | $ 1,037,388 | $ 1,023,277 | $ 989,742 | $ 904,405 | $ 3,918,946 | $ 3,954,812 | $ 3,560,508
Property and equipment, net | 121,027 |  |  |  | 122,751 |  |  |  | 121,027 | 122,751 | 91,849
Litigation-related expenses |  |  |  |  |  |  |  |  | 0 | 0 | 129,674
Critical Infrastructure |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | 510,285 | 506,080 | 497,249 | 493,422 | 536,965 | 537,102 | 511,245 | 481,593 | 2,007,036 | 2,066,905 | 2,081,501
Revenue Excluding Claim Settlement |  |  |  |  |  |  |  |  |  |  | 2,000,000
Critical Infrastructure | Mobility Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,575,539 | 1,647,690 | 1,540,921
Revenue Excluding Claim Settlement |  |  |  |  |  |  |  |  |  |  | 1,500,000
Federal Solution Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | 453,973 | $ 498,156 | $ 482,210 | $ 477,571 | 500,423 | $ 486,175 | $ 478,497 | $ 422,812 | $ 1,911,910 | 1,887,907 | 1,479,007
Changes in reportable segments, description |  |  |  |  |  |  |  |  | we realigned the five business lines within our Federal Solutions segment into four business lines. |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation-related expenses |  |  |  |  |  |  |  |  |  |  | 55,100
Revenue | Critical Infrastructure | Mobility Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation-related expenses |  |  |  |  |  |  |  |  |  |  | 55,100
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 3,000,000 | 3,000,000 | 2,600,000
Property and equipment, net | $ 109,600 |  |  |  | $ 109,900 |  |  |  | $ 109,600 | $ 109,900 | $ 79,900

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