CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to non-controlling interests	$ 71,247	$ 30,272	$ 32,110
Other comprehensive loss, net of tax
Currency translation adjustment	(223)	(502)	(2,809)
Comprehensive income	71,024	29,770	29,301
Net income (loss) attributable to non-controlling interests	(310)	93	(241)
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 71,334	$ 29,677	$ 29,542