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Segments Information - Summary of Adjusted EBITDA Business Segment 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
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Depreciation and amortization | (32,538) |  | (30,952) |  | (32,081) |  | (32,409) |  | (33,008) |  | (31,027) |  | (31,074) |  | (30,591) |  | (127,980) | (125,700) | (69,869)
Interest expense, net | (7,025) |  | (5,387) |  | (3,963) |  | (3,794) |  | (3,981) |  | (4,482) |  | (6,151) |  | (7,815) |  | (20,169) | (22,429) | (18,132)
Income tax (expense) benefit | (9,500) |  | (16,017) |  | (11,891) |  | (5,084) |  | 2,823 |  | 15,453 |  | 53,496 |  | (1,886) |  | (42,492) | 69,886 | (20,367)
Litigation-related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,674
Amortization of deferred gain resulting from sale- leaseback transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,253
Equity-based compensation | (5,643) | [2] | 991 | [2] | (12,854) | [2] | 7,721 | [2] | (20,240) | [2] | 1,657 | [2] | (43,311) | [2] | (3,850) | [2] | (9,785) | (65,744) | (16,487)
Transaction-related costs | (7,985) | [3] | (2,411) | [3] | 2,485 | [3] | (12,011) | [3] | (7,392) | [3] | (9,891) | [3] | (7,715) | [3] | (9,355) | [3] | (19,922) | (34,353) | (12,942)
Restructuring | (718) | [4] | (365) | [4] | (1,143) | [4] | 33 | [4] | (544) | [4] | (309) | [4] | (353) | [4] | (2,218) | [4] | (2,193) | (3,424) |
Other | 151 | [5] | (140) | [5] | (589) | [5] | (581) | [5] | (3,182) | [5] | 902 | [5] | (952) | [5] | (2,923) | [5] | (1,159) | (6,155) | (5,938)
Net income including noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,921 | 137,128 | 239,436
Net income attributable to noncontrolling interests | (5,294) |  | (5,862) |  | (7,826) |  | (1,398) |  | (8,582) |  | (4,481) |  | 114 |  | (3,645) |  | (20,380) | (16,594) | (17,099)
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
Federal Solution Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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”.
[2] | Reflects equity-based compensation costs primarily related to cash-settled awards. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this Annual Report on Form 10-K for a further discussion of these awards.
[3] | Reflects costs incurred in connection with acquisitions and other non-recurring transaction costs, including 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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