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Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ (2,619) | $ (1,501) | [1] | $ (6,147) | $ 2,158 | [1]
Net income from discontinued operations |  | 9,330 | 2,146 | [1] | 8,949 | 4,608 | [1]
Net income |  | 6,711 | 645 | [1] | 2,802 | 6,766 | [1]
Less net income attributable to noncontrolling interest, net of tax |  | 1,523 | 350 | [1] | 1,461 | 752 | [1]
Net income attributable to Oppenheimer Holdings Inc. |  | $ 5,188 | $ 295 | [1] | $ 1,341 | $ 6,014 | [1]
Basic weighted average number of shares outstanding (in shares) |  | 13,367,248 | 13,745,957 | [1] | 13,373,537 | 13,725,208 | [1]
Net dilutive effect of share-based awards, treasury method (in shares) | [2] | 0 | 0 |  | 0 | 617,266 |
Diluted weighted average number of shares outstanding (in shares) |  | 13,367,248 | 13,745,957 | [1] | 13,373,537 | 14,342,474 | [1]
Basic earnings (loss) per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |  |
Continuing operations, basic (in dollars per share) |  | $ (0.20) | $ (0.11) | [1] | $ (0.46) | $ 0.16 | [1]
Discontinued operations, basic (in dollars per share) |  | 0.59 | 0.13 | [1] | 0.56 | 0.28 | [1]
Basic (in dollars per share) |  | 0.39 | 0.02 | [1] | 0.10 | 0.44 | [1]
Diluted earnings (loss) per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |  |
Continuing operations, diluted (in dollars per share) |  | (0.20) | (0.11) | [1] | (0.46) | 0.15 | [1]
Discontinued operations, diluted (in dollars per share) |  | 0.59 | 0.13 | [1] | 0.56 | 0.27 | [1]
Diluted (in dollars per share) |  | $ 0.39 | $ 0.02 | [1] | $ 0.10 | $ 0.42 | [1]
Class A Stock [Member] |  |  |  |  |  |  |
Diluted earnings (loss) per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |  |
Number of anti-dilutive warrants, options and restricted shares, for the year (in shares) |  | 1,271,124 | 1,312,760 |  | 1,271,124 | 40,309 |
[1] | Amounts have been recast to reflect discontinued operations. See Note 3 for details.
[2] | For both the three and six months ended June 30, 2016, the diluted earnings per share computation does not include the anti-dilutive effect of 1,271,124 shares of Class A Stock granted under share-based compensation arrangements (1,312,760 and 40,309, respectively, for the three and six months ended June 30, 2015).

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