Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (1,310)	$ 6,711	[1]	$ (6,061)	$ 2,802	[1]
Other comprehensive income (loss), net of tax
Currency translation adjustment	[2]	780	(654)		2,204	219
Comprehensive income (loss)		(530)	6,057		(3,857)	3,021
Net income attributable to noncontrolling interest, net of tax		9	1,523	[1]	105	1,461	[1]
Comprehensive income (loss) attributable to Oppenheimer Holdings Inc.		$ (539)	$ 4,534		$ (3,962)	$ 1,560

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmQwNTUxZjZiZmE3YzQzNmRhNDgyNjI4Njg2MGZlNTFkfFRleHRTZWxlY3Rpb246QkY3N0ZFNTY0NDI0QTJENUI1NEJFOTUxMzA2RkE2RDAM}

[2] No other comprehensive income (loss) is attributable to noncontrolling interests.