v3.25.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Jul. 18, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Trading Symbol(s) PSN  
Entity Registrant Name Parsons Corporation  
Entity Central Index Key 0000275880  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   106,793,835
Entity File Number 001-07782  
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  
Title of 12(b) Security Common Stock, $1 par value  
Security Exchange Name NYSE  
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE  
Entity Interactive Data Current Yes