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Investments in and Advances to Joint Ventures - Summary of Financial Information for Unconsolidated 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)  
Investments in and advances to unconsolidated joint ventures 68,620       63,560       68,620 63,560  
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
Equity in earnings of unconsolidated joint ventures                 41,721 36,915 40,086
Unconsolidated Joint Ventures                      
Schedule Of Equity Method Investments [Line Items]                      
Current assets 801,335       707,457       801,335 707,457  
Noncurrent assets 564,160       876,385       564,160 876,385  
Total assets 1,365,495       1,583,842       1,365,495 1,583,842  
Current liabilities 655,495       560,306       655,495 560,306  
Noncurrent liabilities 507,131       813,269       507,131 813,269  
Total liabilities 1,162,626       1,373,575       1,162,626 1,373,575  
Total joint venture equity 202,869       210,267       202,869 210,267  
Investments in and advances to unconsolidated joint ventures $ 68,620       $ 63,560       68,620 63,560  
Revenue                 2,081,341 1,773,037 2,114,903
Costs                 1,903,582 1,661,232 1,988,569
Net income attributable to Parsons Corporation                 177,759 111,805 126,334
Equity in earnings of unconsolidated joint ventures                 $ 41,721 $ 36,915 $ 40,086