Document and Entity Information - USD ($) $ in Billions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Feb. 03, 2026 |
Jun. 30, 2025 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Registrant Name | PARSONS CORPORATION | ||
| Entity Central Index Key | 0000275880 | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Common Stock, Shares Outstanding | 105,831,019 | ||
| Entity Public Float | $ 7.7 | ||
| Entity Shell Company | false | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity File Number | 001-07782 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 95-3232481 | ||
| Entity Address, Address Line One | 14291 Park Meadow Drive | ||
| Entity Address, Address Line Two | Suite 100 | ||
| Entity Address, City or Town | Chantilly | ||
| Entity Address, State or Province | VA | ||
| Entity Address, Postal Zip Code | 20151 | ||
| City Area Code | 703 | ||
| Local Phone Number | 988-8500 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Document Financial Statement Error Correction Flag | false | ||
| Title of each class | Common Stock, $1 par value | ||
| Trading Symbol(s) | PSN | ||
| Name of each exchange on which registered | NYSE | ||
| Auditor Name | PricewaterhouseCoopers LLP | ||
| Auditor Location | Los Angeles, California | ||
| Auditor Firm ID | 238 | ||
| Auditor Opinion | Opinions on the Financial Statements and Internal Control over Financial Reporting We have audited the accompanying consolidated balance sheets of Parsons Corporation and its subsidiaries (the "Company") as of December 31, 2025 and 2024, and the related consolidated statements of income, of comprehensive income, of changes in shareholders' equity and of cash flows for each of the three years in the period ended December 31, 2025, including the related notes and schedule of valuation and qualifying accounts for each of the three years in the period ended December 31, 2025 appearing under Item 15(a)(2) (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO. |
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| Documents Incorporated by Reference | Portions of Parsons’ 2026 Proxy Statement are incorporated by reference into Part III of this Annual Report on Form 10-K. |