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Quarterly Information - Unaudited - Schedule of Selected Quarterly Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total 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
Operating income | 41,579 |  | 66,271 |  | 46,264 |  | 23,701 |  | 24,274 |  | 53,449 |  | (8,706) |  | 23,046 |  | 177,815 | 92,063 | 205,008
Net income attributable to Parsons Corporation | 21,611 |  | 40,658 |  | 23,299 |  | 12,973 |  | 13,722 |  | 56,812 |  | 40,259 |  | 9,741 |  | 98,541 | 120,534 | 222,337
Adjusted EBITDA attributable to Parsons Corporation | 90,163 | [1] | 100,801 | [1] | 91,161 | [1] | 60,496 | [1] | 87,828 | [1] | 88,990 | [1] | 76,205 | [1] | 72,024 | [1] | 321,868 | 307,951 | 228,837
Adjusted EBITDA attributable to noncontrolling interests | 5,218 |  | 6,071 |  | 7,942 |  | 1,522 |  | 8,712 |  | 4,655 |  | (20) |  | 3,749 |  | (20,753) | (17,096) | (17,407)
Federal Solution Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total 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
Adjusted EBITDA attributable to Parsons Corporation | 42,149 |  | 45,874 |  | 47,700 |  | 31,617 |  | 42,442 |  | 50,359 |  | 35,700 |  | 40,599 |  | 167,340 | 169,100 | 121,986
Critical Infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total 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
Adjusted EBITDA attributable to Parsons Corporation | $ 42,796 |  | $ 48,856 |  | $ 35,519 |  | $ 27,357 |  | $ 36,674 |  | $ 33,976 |  | $ 40,525 |  | $ 27,676 |  | $ 154,528 | $ 138,851 | $ 106,851
[1] | The following table presents a reconciliation of net income attributable to Parsons Corporation to Adjusted EBITDA. For more information on our use of Adjusted EBITDA, how we use this metric, why we present this metric and the material limitations on usefulness of this metric, see “Note 21—Segments Information” in the “Other Information” table located in “Selected Consolidated Financial Data”.

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