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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2024
Aug. 02, 2024
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Document Period End Date Jun. 30, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Entity Registrant Name First Advantage Corporation  
Entity Central Index Key 0001210677  
Entity Tax Identification Number 84-3884690  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity File Number 001-31666  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 1 Concourse Parkway NE  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Atlanta  
Entity Address, Country GA  
Entity Address, Postal Zip Code 30328  
City Area Code 888  
Local Phone Number 314-9761  
Trading Symbol FA  
Entity Common Stock, Shares Outstanding   145,407,414
Title of 12(b) Security Common Stock, $0.001 par value per share  
Security Exchange Name NASDAQ