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Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Basic weighted average number of shares outstanding (in shares)	13,213,139	13,366,863	13,290,399	13,371,296
Net dilutive effect of share-based awards, treasury method (in shares)	550,377	0	499,737	0
Diluted weighted average number of shares outstanding (in shares)	13,763,516	13,366,863	13,790,136	13,371,296
Net income (loss) from continuing operations	$ 7,403	$ (1,059)	$ 702	$ (7,206)
Net income from discontinued operations	461	413	1,101	9,362
Net income	7,864	(646)	1,803	2,156
Less net income attributable to noncontrolling interest, net of tax	75	66	180	1,527
Net income (loss) attributable to Oppenheimer Holdings Inc.	$ 7,789	$ (712)	$ 1,623	$ 629
Basic net income (loss) per share attributable to Oppenheimer Holdings Inc.
Continuing operations, basic (in dollars per share)	$ 0.56	$ (0.08)	$ 0.05	$ (0.54)
Discontinued operations, basic (in dollars per share)	0.03	0.03	0.07	0.59
Basic (in dollars per share)	0.59	(0.05)	0.12	0.05
Diluted net income (loss) per share attributable to Oppenheimer Holdings Inc.
Continuing operations, diluted (in dollars per share)	0.54	(0.08)	0.05	(0.54)
Discontinued operations, diluted (in dollars per share)	0.03	0.03	0.07	0.59
Diluted (in dollars per share)	$ 0.57	$ (0.05)	$ 0.12	$ 0.05
Class A Stock [Member]
Diluted net income (loss) per share attributable to Oppenheimer Holdings Inc.
Number of anti-dilutive warrants, options and restricted shares, for the year (in shares)	15,450	1,249,063	15,450	1,249,063

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256

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