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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
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