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Quarterly Information - Unaudited - Schedule of Selected Quarterly Financial Information (Parenthetical) (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Quarterly Financial Information Disclosure [Abstract]          
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2024-04 [Member]        
Reversal of loss on extinguishment of debt $ 211,000       $ 211,000
Reversal of tax benefit of loss on extinguishment of debt 49,900       49,900
Convertible debt repurchase loss 18,400     $ 0 18,355
Increase in shareholders equity relating to reversal of loss on extinguishment of debt and inducement expenses 192,600       192,600
Adjustments to shareholders equity relating to reversal of tax benefit $ 45,600       $ 45,600
Dilutive effect of stock-based awards 1,600 1,395 1,661 1,400 1,628
Convertible senior notes if-converted method interest adjustment $ 2,900 $ 27 $ 54 $ 135 $ 2,874
Dilutive effect of convertible senior notes 4,000 631 2,573 1,547 3,983
Diluted net income attributable to Parsons Corporation   $ 64,150 $ 72,005 $ 185,691 $ 183,747
Diluted shares   109,078 111,086 110,056 112,180