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Earnings Per Share - Earnings per share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Loss Per Share [Line Items]        
Basic weighted average number of shares outstanding 13,610,991 13,670,604 13,599,431 13,627,122
Net dilutive effect of warrant, treasury method    [1]    [1]    [1]    [1]
Net dilutive effect of share-based awards, treasury method 550,266 [2] 245,294 [2] 337,585 [2] 295,515 [2]
Diluted weighted average number of shares outstanding 14,161,257 13,915,897 13,937,016 13,922,637
Net profit for the period $ 3,024 $ 2,459 $ 2,516 $ 8,658
Net profit attributable to non-controlling interests 702 353 2,429 1,775
Net profit attributable to Oppenheimer Holdings Inc. $ 2,322 $ 2,106 $ 87 $ 6,883
Basic profit per share $ 0.17 $ 0.15 $ 0.01 $ 0.51
Diluted profit per share $ 0.16 $ 0.15 $ 0.01 $ 0.49
[1] As part of the consideration for the 2008 acquisition of certain businesses from CIBC World Markets Corp., the Company issued a warrant to CIBC to purchase 1 million shares of Class A Stock of the Company at $48.62 per share exercisable five years from the January 14, 2008 acquisition date. For the three and nine months ended September 30, 2012 and 2011, the effect of the warrant is anti-dilutive.
[2] For the both the three and nine months ended September 30, 2012, the diluted earnings per share computations do not include the anti-dilutive effect of 1,059,638 shares of Class A Stock granted under share-based compensation arrangements together with the warrant described in (1) above (1,139,695 and 1,142,028 shares of Class A Stock, respectively, for the three and nine months ended September 30, 2011).