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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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 293,362	$ 243,376	$ 243,830	$ 239,146	$ 249,415	$ 231,838	$ 233,145	$ 238,214	$ 1,019,714	$ 952,612	$ 958,992
Income (loss) before income taxes	23,359	8,163	5,674	6,713	(7,135)	5,258	7,839	(6,489)	43,909	(527)	17,848
Net income (loss) attributable to Oppenheimer Holdings Inc.	$ 13,313	$ 5,237	$ 2,848	$ 3,663	$ (3,700)	$ 2,322	$ 2,422	$ (4,657)	$ 25,061	$ (3,613)	$ 10,316
Earnings (loss) per share attributable to Oppenheimer Holdings Inc.
Basic	$ 0.99	$ 0.38	$ 0.21	$ 0.27	$ (0.27)	$ 0.17	$ 0.18	$ (0.34)	$ 1.85	$ (0.27)	$ 0.76
Diluted	$ 0.94	$ 0.37	$ 0.20	$ 0.26	$ (0.27)	$ 0.16	$ 0.17	$ (0.34)	$ 1.77	$ (0.27)	$ 0.74
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
High	$ 24.80	$ 19.75	$ 20.00	$ 21.00	$ 17.42	$ 18.00	$ 18.71	$ 19.69	$ 24.80	$ 19.69
Low	$ 16.66	$ 16.52	$ 16.75	$ 15.69	$ 14.63	$ 13.24	$ 13.21	$ 15.67	$ 15.69	$ 13.21

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