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Investments in and Advances to Joint Ventures - Summary of Financial Information for Consolidated Joint Ventures (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
Schedule Of Equity Method Investments [Line Items]                      
Current assets $ 1,526,409       $ 1,488,807       $ 1,526,409 $ 1,488,807  
Total assets 3,450,368       2,612,578       3,450,368 2,612,578  
Current liabilities 1,144,382       1,006,161       1,144,382 1,006,161  
Total liabilities 1,789,612       1,657,345       1,789,612 1,657,345  
Total joint venture equity 1,629,890       (967,537)       1,629,890 (967,537)  
Revenue 1,037,388 $ 1,023,277 $ 989,742 $ 904,405 928,940 $ 976,157 $ 900,732 $ 754,679 3,954,812 3,560,508 $ 3,017,011
Costs                 3,123,062 2,795,005 2,400,140
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
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
Consolidated Joint Ventures                      
Schedule Of Equity Method Investments [Line Items]                      
Current assets 255,167       287,227       255,167 287,227  
Noncurrent assets 2,860       2,689       2,860 2,689  
Total assets 258,027       289,916       258,027 289,916  
Current liabilities 193,583       199,833       193,583 199,833  
Total liabilities 193,583       199,833       193,583 199,833  
Total joint venture equity $ 64,444       $ 90,083       64,444 90,083  
Revenue                 473,486 540,345 446,506
Costs                 435,947 376,628 426,245
Net income attributable to Parsons Corporation                 37,539 163,717 20,261
Net income attributable to noncontrolling interests                 $ 16,594 $ 17,099 $ 14,211