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Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Basic weighted average number of shares outstanding 13,239,628 13,399,250
Net dilutive effect of share-based awards, treasury method [1] 737,864 0
Diluted weighted average number of shares outstanding 13,977,492 13,399,250
Net income (loss) from continuing operations $ 6,709 $ (5,338)
Net income from discontinued operations 0 587
Net income (loss) 6,709 (4,751)
Net income attributable to non-controlling interest, net of tax 4 96
Net income (loss) attributable to Oppenheimer Holdings Inc. $ 6,705 $ (4,847)
Continuing operations (in dollars per share) $ 0.51 $ (0.40)
Discontinued operations (in dollars per share) 0.00 0.04
Net income (loss) per share 0.51 (0.36)
Continuing operations (in dollars per share) 0.48 (0.40)
Discontinued operations (in dollars per share) 0.00 0.04
Net loss per share (in dollars per share) $ 0.48 $ (0.36)
[1] For the three months ended March 31, 2018, the diluted earnings per share computation does not include the anti-dilutive effect of 4,050 shares of Class A Stock granted under share-based compensation arrangements (1,334,607 shares for the three months ended March 31, 2017 ).(2)Represents net income from discontinued operations less net income attributable to non-controlling interest, net of tax divided by weighted average number of shares outstanding.