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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 27, 2025
Jun. 28, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-12043    
Entity Registrant Name OPPENHEIMER HOLDINGS INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 98-0080034    
Entity Address, Address Line One 85 Broad Street,    
Entity Address, City or Town New York,    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10004    
City Area Code 212    
Local Phone Number 668-8000    
Title of 12(b) Security Class A non-voting common stock    
Trading Symbol OPY    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 437.3
Documents Incorporated by Reference
The Company's definitive Proxy Statement for the 2025 Annual Meeting of Stockholders to be filed by the Company pursuant to Regulation 14A is incorporated into Items 10, 11, 12, 13 and 14 of Part III of this Form 10-K.
    
Entity Central Index Key 0000791963    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   10,425,575  
Class B Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   99,665