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Earnings per share - Summary of Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Earnings Per Share Basic And Diluted [Line Items]                      
Basic weighted average number of shares outstanding                 13,602,205 13,638,087 13,340,846
Net dilutive effect of warrants, treasury method                       
Net dilutive effect of share-based awards, treasury method                    298,646 556,415
Diluted common shares                 13,602,205 13,936,733 13,897,261
Net profit (loss), for the year                 $ (851) $ 12,617 $ 40,780
Net profit attributable to non-controlling interests                 2,762 2,301 2,248
Net profit available to Oppenheimer Holdings Inc. stockholders and assumed conversions $ (3,700) $ 2,322 $ 2,422 $ (4,657) $ 3,433 $ 2,106 $ (309) $ 5,086 $ (3,613) $ 10,316 $ 38,532
Basic earnings per share $ (0.27) $ 0.17 $ 0.18 $ (0.34) $ 0.25 $ 0.15 $ (0.02) $ 0.38 $ (0.27) $ 0.76 $ 2.89
Diluted earnings per share $ (0.27) $ 0.16 $ 0.17 $ (0.34) $ 0.25 $ 0.15 $ (0.02) $ 0.36 $ (0.27) $ 0.74 $ 2.77