Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
REVENUE
Commissions	$ 83,852	$ 92,591	[1]	$ 170,569	$ 196,424	[1]
Advisory fees	72,783	66,104	[1]	142,192	132,130	[1]
Investment banking	15,386	18,881	[1]	33,407	31,264	[1]
Interest	12,829	12,007	[1]	23,394	25,049	[1]
Principal transactions, net	5,302	7,577	[1]	10,675	14,195	[1]
Other	25,732	14,914	[1]	48,908	27,968	[1]
Total revenue	215,884	212,074	[1]	429,145	427,030	[1]
EXPENSES
Compensation and related expenses	142,657	141,721	[1]	286,535	290,216	[1]
Communications and technology	18,399	17,638	[1]	36,105	35,318	[1]
Occupancy and equipment costs	15,161	14,984	[1]	30,433	29,887	[1]
Clearing and exchange fees	5,916	6,199	[1]	11,770	13,120	[1]
Interest	6,854	4,972	[1]	12,210	9,839	[1]
Other	28,534	31,806	[1]	60,754	61,236	[1]
Total expenses	217,521	217,320	[1]	437,807	439,616	[1]
Loss before income taxes from continuing operations	(1,637)	(5,246)	[1]	(8,662)	(12,586)	[1]
Current and Deferred Income Tax Expense (Benefit) from Continuing Operations	(274)	(2,391)	[1]	(1,961)	(6,439)	[1]
Net loss from continuing operations	(1,363)	(2,855)	[1]	(6,701)	(6,147)	[1]
Income from discontinued operations	89	15,366	[1]	1,065	14,709	[1]
Income taxes	36	5,800	[1]	425	5,760	[1]
Net income from discontinued operations	53	9,566	[1]	640	8,949	[1]
Net income (loss)	(1,310)	6,711	[1]	(6,061)	2,802	[1]
Less net income attributable to noncontrolling interest, net of tax	9	1,523	[1]	105	1,461	[1]
Net income (loss) attributable to Oppenheimer Holdings Inc.	$ (1,319)	$ 5,188	[1]	$ (6,166)	$ 1,341	[1]
Basic net income (loss) per share attributable to Oppenheimer Holdings Inc.
Continuing operations, basic (in dollars per share)	$ (0.10)	$ (0.21)	[1]	$ (0.50)	$ (0.46)	[1]
Discontinued operations, basic (in dollars per share)	0.00	0.60	[1]	0.04	0.56	[1]
Basic (in dollars per share)	(0.10)	0.39	[1]	(0.46)	0.10	[1]
Diluted net income (loss) per share attributable to Oppenheimer Holdings Inc.
Continuing operations, diluted (in dollars per share)	(0.10)	(0.21)	[1]	(0.50)	(0.46)	[1]
Discontinued operations, diluted (in dollars per share)	0.00	0.60	[1]	0.04	0.56	[1]
Diluted (in dollars per share)	(0.10)	0.39	[1]	(0.46)	0.10	[1]
Dividends declared per share (in dollars per share)	$ 0.11	$ 0.11	[1]	$ 0.22	$ 0.22	[1]
Weighted average shares
Basic (in shares)	13,260,855	13,367,248	[1]	13,329,670	13,373,537	[1]
Diluted (in shares)	13,260,855	13,367,248		13,329,670	13,373,537

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