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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Basic weighted average number of shares outstanding                 13,577,725 13,602,205 13,638,087
Net dilutive effect of warrant, treasury method                         
Net dilutive effect of share-based awards, treasury method                 546,335    298,646
Diluted weighted average number of shares outstanding                 14,124,060 13,602,205 13,936,733
Net income (loss) for the year                 $ 26,153 $ (851) $ 12,617
Net income attributable to non-controlling interest, net of tax                 1,092 2,762 2,301
Net income (loss) attributable to Oppenheimer Holdings Inc. $ 13,313 $ 5,237 $ 2,848 $ 3,663 $ (3,700) $ 2,322 $ 2,422 $ (4,657) $ 25,061 $ (3,613) $ 10,316
Basic earnings per share $ 0.99 $ 0.38 $ 0.21 $ 0.27 $ (0.27) $ 0.17 $ 0.18 $ (0.34) $ 1.85 $ (0.27) $ 0.76
Diluted earnings per share $ 0.94 $ 0.37 $ 0.20 $ 0.26 $ (0.27) $ 0.16 $ 0.17 $ (0.34) $ 1.77 $ (0.27) $ 0.74