CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 10,266	$ (9,568)	$ 36,010	$ 4,896
Other comprehensive loss, net of tax
Currency translation adjustment	(580)	(663)	(967)	(1,160)
Comprehensive income (loss)	9,686	(10,231)	35,043	3,736
Less net loss attributable to noncontrolling interests	0	(168)	(310)	(321)
Comprehensive income (loss) attributable to Oppenheimer Holdings Inc.	$ 9,686	$ (10,063)	$ 35,353	$ 4,057