CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 25,744	$ 14,464
Other comprehensive loss, net of tax
Currency translation adjustment	(388)	(497)
Comprehensive income	25,356	13,967
Less net loss attributable to noncontrolling interests	(310)	(153)
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 25,666	$ 14,120