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Quarterly Information - Schedule of Quarterly Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 249,415 | $ 231,838 | $ 233,145 | $ 238,214 | $ 229,438 | $ 231,619 | $ 244,518 | $ 253,417 | $ 952,612 | $ 958,992 | $ 1,036,273
Profit before income taxes | (7,135) | 5,258 | 7,839 | (6,489) | 2,051 | 4,264 | 1,704 | 9,829 | (527) | 17,848 | 67,991
Net profit (loss) attributable to Oppenheimer Holdings Inc. | $ (3,700) | $ 2,322 | $ 2,422 | $ (4,657) | $ 3,433 | $ 2,106 | $ (309) | $ 5,086 | $ (3,613) | $ 10,316 | $ 38,532
Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ (0.27) | $ 0.17 | $ 0.18 | $ (0.34) | $ 0.25 | $ 0.15 | $ (0.02) | $ 0.38 | $ (0.27) | $ 0.76 | $ 2.89
Diluted | $ (0.27) | $ 0.16 | $ 0.17 | $ (0.34) | $ 0.25 | $ 0.15 | $ (0.02) | $ 0.36 | $ (0.27) | $ 0.74 | $ 2.77
Dividends per share | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.44 | $ 0.44 |
Market price of Class A Stock (1): |  |  |  |  |  |  |  |  |  |  |
High | $ 17.42 | $ 18.00 | $ 18.71 | $ 19.69 | $ 19.45 | $ 28.98 | $ 34.87 | $ 33.93 | $ 19.69 | $ 34.87 |
Low | $ 14.63 | $ 13.24 | $ 13.21 | $ 15.67 | $ 12.47 | $ 15.47 | $ 25.00 | $ 24.63 | $ 13.21 | $ 12.47 |

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