XML 10 R1.htm IDEA: XBRL DOCUMENT v3.23.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2023
Oct. 18, 2023
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2023  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Trading Symbol BBSI  
Entity Registrant Name BARRETT BUSINESS SERVICES, INC.  
Entity Central Index Key 0000902791  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   6,616,653
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code MD  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 0-21886  
Entity Tax Identification Number 52-0812977  
Entity Address, Address Line One 8100 NE Parkway Drive  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Vancouver  
Entity Address, State or Province WA  
Entity Address, Postal Zip Code 98662  
City Area Code 360  
Local Phone Number 828-0700