CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 13,779	$ 4,665	$ 18,676	$ 9,723
Other comprehensive loss, net of tax
Currency translation adjustment	(580)	(410)	(1,740)	(3,062)
Comprehensive income	13,199	4,255	16,936	6,661
Less net income (loss) attributable to noncontrolling interests	(82)	145	(403)	(215)
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 13,281	$ 4,110	$ 17,339	$ 6,876