XML 82 R1.htm IDEA: XBRL DOCUMENT v2.4.0.6
Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Feb. 28, 2013
Class A Stock [Member]
Feb. 28, 2013
Class B Stock [Member]
Entity Information [Line Items]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Dec. 31, 2012      
Document Fiscal Year Focus 2012      
Document Fiscal Period Focus FY      
Trading Symbol OPY      
Entity Registrant Name OPPENHEIMER HOLDINGS INC      
Entity Central Index Key 0000791963      
Current Fiscal Year End Date --12-31      
Entity Well-known Seasoned Issuer No      
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Filer Category Accelerated Filer      
Entity Common Stock, Shares Outstanding     13,508,318 99,680
Entity Public Float   $ 212.0