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Quarterly Information - Unaudited - Net Income (Loss) To Adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 29, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Parsons Corporation | $ 13,722 | $ 56,812 | $ 40,259 | $ 9,741 | $ 7,447 | $ 41,222 | $ 148,381 | $ 25,287 | $ 120,534 | $ 222,337 | $ 97,326
Interest expense, net | 3,981 | 4,482 | 6,151 | 7,815 | 6,015 | 5,589 | 3,270 | 3,258 | 22,429 | 18,132 | 13,333
Income tax expense (benefit) | (2,823) | (15,453) | (53,496) | 1,886 | 1,841 | 4,154 | 9,019 | 5,353 | (69,886) | 20,367 | 21,464
Depreciation and amortization | 33,008 | 31,027 | 31,074 | 30,591 | 23,213 | 23,599 | 14,048 | 9,009 | 125,700 | 69,869 | 35,198
Net income attributable to noncontrolling interests | 8,582 | 4,481 | (114) | 3,645 | 6,783 | 4,844 | 1,657 | 3,815 | 16,594 | 17,099 | 14,211
Litigation-related expenses |  |  |  |  |  |  | (132,004) | 2,330 | 0 | 129,674 | 0
Amortization of deferred gain resulting from sale- leaseback transactions |  |  |  |  | (1,813) | (1,798) | (1,829) | (1,813) |  | 7,253 | 7,283
Stock-based compensation | 20,240 | (1,657) | 43,311 | 3,850 | 3,289 | 5,049 | 5,049 | 3,100 | 65,744 | 16,487 | 19,016
Transaction related costs | 7,392 | 9,891 | 7,715 | 9,355 | 5,431 | 2,456 | 4,930 | 125 | 34,353 | 12,942 | 1,190
Restructuring | 544 | 309 | 353 | 2,218 |  |  |  |  | 3,424 |  |
Other | 3,182 | (902) | 952 | 2,923 | 2,009 | 3,449 | 114 | 366 | 6,155 | 5,938 | 5,166
Adjusted EBITDA attributable to Parsons Corporation | $ 87,828 | $ 88,990 | $ 76,205 | $ 72,024 | $ 54,215 | $ 88,564 | $ 52,635 | $ 50,830 | $ 307,951 | $ 228,837 | $ 194,756

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