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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 28, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
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 No    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   100,669,694  
Entity Public Float     $ 3.7
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 5875 Trinity Parkway, #300    
Entity Address, City or Town Centreville    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 21120    
City Area Code 703    
Local Phone Number 988-8500    
Document Annual Report true    
Document Transition Report false    
Title of each class Common Stock, $1 par value    
Trading Symbol(s) PSN    
Name of each exchange on which registered NYSE    
Documents Incorporated by Reference

Portions of Parsons’ 2020 Proxy Statement are incorporated by reference into Part III of this Annual Report on Form 10-K.