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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 9 Months Ended
Sep. 30, 2019
Sep. 28, 2018
Sep. 30, 2019
Sep. 28, 2018
Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]          
Current assets $ 1,474,261   $ 1,474,261   $ 1,488,807
Total assets 3,362,644   3,362,644   2,612,578
Current liabilities 1,156,259   1,156,259   1,006,161
Total liabilities 1,768,193   1,768,193   1,657,345
Total joint venture equity (1,010,654)   (1,010,654)   (967,537)
Revenues 1,023,277 $ 976,157 2,917,424 $ 2,631,568  
Costs 798,552 783,018 2,297,512 2,054,201  
Net income attributable to Parsons Corporation 56,812 41,222 106,812 214,890  
Net income attributable to noncontrolling interests 4,481 4,844 8,012 10,316  
Consolidated Joint Ventures          
Schedule Of Equity Method Investments [Line Items]          
Current assets 254,204   254,204   287,227
Noncurrent assets 2,836   2,836   2,689
Total assets 257,040   257,040   289,916
Current liabilities 198,079   198,079   199,833
Total liabilities 198,079   198,079   199,833
Total joint venture equity 58,961   58,961   $ 90,083
Revenues 117,611 126,480 341,719 413,548  
Costs 108,839 116,468 322,826 262,146  
Net income attributable to Parsons Corporation 8,772 10,012 18,893 151,402  
Net income attributable to noncontrolling interests $ 4,481 $ 4,844 $ 8,012 $ 10,316