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Quarterly Information - Unaudited - Schedule of Selected Quarterly Financial Information (Parenthetical) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 01, 2024
Mar. 31, 2025
Mar. 31, 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 1,500,000 1,637 1,502,000
Convertible senior notes if-converted method interest adjustment $ 2,800 $ 54 $ 2,766
Dilutive effect of convertible senior notes 6,800,000 2,118 6,802,000
Diluted net income attributable to Parsons Corporation   $ 66,257 $ 42,516
Diluted shares   111,026 114,362,000