CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (9,568)	$ (4,720)	$ 4,896	$ 5,058
Other comprehensive loss, net of tax
Currency translation adjustment	(663)	(2,038)	(1,160)	(2,652)
Comprehensive income (loss)	(10,231)	(6,758)	3,736	2,406
Less net loss attributable to noncontrolling interests	(168)	(846)	(321)	(360)
Comprehensive income (loss) attributable to Oppenheimer Holdings Inc.	$ (10,063)	$ (5,912)	$ 4,057	$ 2,766