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Segment Information - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Segment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | Segment     2    
Revenues $ 1,621,748 $ 1,810,116 $ 4,760,431 $ 5,016,259  
Property and equipment, net 125,867   $ 125,867   $ 111,575
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]     srt:ChiefExecutiveOfficerMember    
Segment Reporting, Expense Information Used by CODM, Description     The CODM evaluates segment operating performance using segment Revenue, segment direct cost of contracts, segment Selling, General and Administrative expense and segment Adjusted EBITDA attributable to Parsons Corporation.    
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description     Adjusted EBITDA is the measure of our operating performance used by the CODM to assess our segments’ financial performance. The CODM uses Adjusted EBITDA for business planning purposes, including to manage our segments against internal projected results of operations and measure the performance of our segments generally.    
United States          
Segment Reporting Information [Line Items]          
Revenues 1,200,000 $ 1,400,000 $ 3,500,000 $ 3,900,000  
Property and equipment, net $ 106,000   $ 106,000   $ 94,000