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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Basic weighted average number of shares outstanding 13,604,276 13,610,991 13,606,527 13,599,431
Net dilutive effect of warrant, treasury method            
Net dilutive effect of share-based awards, treasury method 567,526 550,266 503,604 337,585
Diluted weighted average number of shares outstanding 14,171,802 14,161,257 14,110,131 13,937,016
Net income for the period $ 5,508 $ 3,024 $ 12,467 $ 2,516
Net income attributable to non-controlling interest, net of tax 271 702 719 2,429
Net income attributable to Oppenheimer Holdings Inc. $ 5,237 $ 2,322 $ 11,748 $ 87
Basic earnings per share $ 0.38 $ 0.17 $ 0.86 $ 0.01
Diluted earnings per share $ 0.37 $ 0.16 $ 0.83 $ 0.01