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v3.25.3

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

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