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Segments Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2024 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  |  |  |
Revenue |  |  | $ 1,734,317 | $ 1,535,676 | $ 6,750,576 | $ 5,442,749 | $ 4,195,272
Direct cost of contracts |  |  |  |  | (5,344,154) | (4,236,735) | (3,248,550)
Selling, general and administrative expenses | [1] |  |  |  | (304,186) | (259,254) | (228,227)
Equity in earnings (losses) of unconsolidated joint ventures |  |  |  |  | (23,361) | (47,751) | 16,347
Other segment items | [2] |  |  |  | (530,636) | (481,974) | (412,453)
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  | 548,239 | 417,035 | 322,389
Adjusted EBITDA attributable to noncontrolling interests |  |  |  |  | 56,714 | 47,638 | 30,393
Depreciation and amortization |  |  |  |  | (99,251) | (119,973) | (120,501)
Interest expense, net |  |  |  |  | (40,154) | (29,306) | (22,219)
Income tax expense |  |  | (18,729) | (13,324) | (76,986) | (56,138) | (39,657)
Equity-based compensation expense |  |  |  |  | (61,492) | (36,151) | (24,354)
Convertible debt repurchase loss |  | $ (18,400) |  | (18,355) | (18,355) | 0 | 0
Transaction-related costs | [3] |  |  |  | (17,138) | (12,013) | (16,270)
Restructuring expense | [4] |  |  |  |  | (1,244) | (213)
Other | [5] |  |  |  | (912) | (1,933) | (3,003)
Net income including noncontrolling interests |  |  |  |  | 290,665 | 207,915 | 126,565
Net income attributable to noncontrolling interests |  |  |  |  | (55,612) | (46,766) | (29,901)
Net income attributable to Parsons Corporation |  |  | 54,180 | 39,750 | 235,053 | 161,149 | 96,664
Federal Solution Segment |  |  |  |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  |  |  |
Revenue |  |  | 1,003,323 | 909,608 | 4,007,114 | 3,020,701 | 2,212,987
Direct cost of contracts |  |  |  |  | (3,187,829) | (2,375,350) | (1,703,297)
Selling, general and administrative expenses | [1] |  |  |  | (157,442) | (129,507) | (117,759)
Equity in earnings (losses) of unconsolidated joint ventures |  |  |  |  | 3,254 | 4,190 | 3,677
Other segment items | [2] |  |  |  | (249,759) | (230,784) | (196,604)
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  | 415,338 | 289,250 | 199,004
Critical Infrastructure |  |  |  |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  |  |  |
Revenue |  |  | $ 730,994 | $ 626,068 | 2,743,462 | 2,422,048 | 1,982,285
Direct cost of contracts |  |  |  |  | (2,156,325) | (1,861,385) | (1,545,253)
Selling, general and administrative expenses | [1] |  |  |  | (146,744) | (129,747) | (110,468)
Equity in earnings (losses) of unconsolidated joint ventures |  |  |  |  | (26,615) | (51,941) | 12,670
Other segment items | [2] |  |  |  | (280,877) | (251,190) | (215,849)
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  | 132,901 | 127,785 | 123,385
Net income attributable to Parsons Corporation |  |  |  |  | $ (47,651) | $ 26,261 | $ 0
[1] | The amount of selling, general and administrative expenses (“SG&A”) is total SG&A excluding allocations.
[2] | The amount of other segment items is the difference between segment revenue less direct cost of contracts, segment SG&A expenses, equity in earnings (losses) of unconsolidated joint ventures, and Adjusted EBITDA attributable to Parsons Corporation. Other segment items primarily include: i. Corporate and shared segment SG&A (excluding Adjusted EBITDA items) ii. Noncontrolling interests attributable to operating income and other income/expense iii. Bad debt expense iv. Sublease income v. Foreign currency gain/loss, and vi. Certain other income/expense items
[3] | Reflects costs incurred in connection with acquisitions, and other non-recurring transaction costs, primarily fees paid for professional services and employee retention.
[4] | Reflects costs associated with and related to our corporate restructuring initiatives.
[5] | Includes a combination of gain/loss related to sale of fixed assets, software implementation costs, and other individually insignificant items that are non-recurring in nature.

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