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Quarterly Information - Unaudited - Schedule of Selected Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ 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 [Line Items]                      
Total revenues $ 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
Operating income 24,274 53,449 (8,706) 23,046 24,092 55,113 86,912 38,891 92,063 205,008 150,702
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
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)
Earnings per share:                      
Basic $ 0.14 $ 0.57 $ 0.44 $ 0.12 $ 0.10 $ 0.52 $ 1.83 $ 0.31 $ 1.30 $ 2.78 $ 1.16
Diluted $ 0.14 $ 0.57 $ 0.44 $ 0.12 $ 0.10 $ 0.52 $ 1.83 $ 0.31 $ 1.30 $ 2.78 $ 1.16
Federal Solution Segment                      
Quarterly Financial Information [Line Items]                      
Total revenues $ 500,423 $ 486,175 $ 478,497 $ 422,812 $ 402,882 $ 443,725 $ 341,065 $ 291,335 $ 1,887,907 $ 1,479,007 $ 1,079,906
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                      
Quarterly Financial Information [Line Items]                      
Total revenues 536,965 537,102 511,245 481,593 526,058 532,432 559,667 463,344 2,066,905 2,081,501 1,937,105
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