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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 18, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name First Advantage Corporation    
Entity Central Index Key 0001210677    
Trading Symbol FA    
Entity File Number 001-31666    
Entity Incorporation, State or Country Code DE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 583,860,750
Entity Common Stock, Shares Outstanding   152,941,584  
Document Annual Report true    
Document Transition Report false    
Entity Tax Identification Number 84-3884690    
Entity Address, Address Line One 1 Concourse Parkway NE    
Entity Address, Address Line Two Suite 200    
Entity Address, City or Town Atlanta    
Entity Address, State or Province GA    
Entity Address, Postal Zip Code 30328    
City Area Code 888    
Local Phone Number 314-9761    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference

Portions of the registrant’s definitive Proxy Statement relating to its 2022 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2021 are incorporated herein by reference in Part III.

    
Auditor Name Deloitte & Touche LLP    
Auditor Location Atlanta, Georgia    
Auditor Firm ID 34