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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, 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
Adjusted EBITDA attributable to Parsons Corporation                      
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
Adjusted EBITDA attributable to noncontrolling interests (8,712) (4,655) 20 (3,749) (6,726) (5,002) (1,759) (3,920) 17,096 17,407 14,891
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)
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)
Litigation-related expenses                   129,674 (10,026)
Amortization of deferred gain resulting from sale- leaseback transactions         (1,813) (1,798) (1,829) (1,813)   7,253 7,283
Equity-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)
Net income including noncontrolling interests                 137,128 239,436 111,537
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)
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
Federal Solution Segment                      
Adjusted EBITDA attributable to Parsons Corporation                      
Adjusted EBITDA attributable to Parsons Corporation 42,442 50,359 35,700 40,599 20,934 45,556 33,947 21,549 169,100 121,986 95,354
Critical Infrastructure                      
Adjusted EBITDA attributable to Parsons Corporation                      
Adjusted EBITDA attributable to Parsons Corporation $ 36,674 $ 33,976 $ 40,525 $ 27,676 $ 26,555 $ 38,006 $ 16,929 $ 25,361 $ 138,851 $ 106,851 $ 99,402