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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Basic weighted average number of shares outstanding 13,607,348 13,588,842 13,607,671 13,593,496
Net dilutive effect of warrant, treasury method            
Net dilutive effect of share-based awards, treasury method 461,020 420,803 461,108   
Diluted weighted average number of shares outstanding 14,068,368 14,009,645 14,068,779 13,593,496
Net income (loss) for the period $ 3,066 $ 3,375 $ 6,959 $ (508)
Net income attributable to non-controlling interest, net of tax 218 953 448 1,727
Net income (loss) attributable to Oppenheimer Holdings Inc. $ 2,848 $ 2,422 $ 6,511 $ (2,235)
Basic earnings (loss) per share $ 0.21 $ 0.18 $ 0.48 $ (0.16)
Diluted earnings (loss) per share $ 0.20 $ 0.17 $ 0.46 $ (0.16)