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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 14, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol BBSI    
Entity Registrant Name BARRETT BUSINESS SERVICES, INC.    
Entity Central Index Key 0000902791    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Common Stock, Shares Outstanding   25,833,116  
Entity Public Float     $ 825,395,030
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    
Entity File Number 0-21886    
Document Annual Report true    
Document Transition Report false    
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    
Auditor Name Meghann Hartley    
Auditor Location Portland    
Auditor Firm ID 34    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive Proxy Statement for the 2025 Annual Meeting of Stockholders are hereby incorporated by reference in Part III of Form 10-K.

    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Barrett Business Services, Inc. and subsidiaries (the “Company”) as of December 31, 2024 and December 31, 2023, the related consolidated statements of operations, comprehensive income, stockholders' equity, and cash flows, for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and December 31, 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 28, 2025, expressed an unqualified opinion on the Company's internal control over financial reporting.