Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (4,720)	$ 31,159	$ 5,058	$ 69,817
Other comprehensive income (loss), net of tax
Currency translation adjustment	(2,038)	537	(2,652)	(299)
Comprehensive income (loss)	(6,758)	31,696	2,406	69,518
Less net income (loss) attributable to noncontrolling interests	(846)	0	(360)	0
Comprehensive income (loss) attributable to Oppenheimer Holdings Inc.	$ (5,912)	$ 31,696	$ 2,766	$ 69,518