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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