CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to non-controlling interests	$ 30,272	$ 32,110	$ 158,964
Other comprehensive income (loss), net of tax
Currency translation adjustment	(502)	(2,809)	777
Comprehensive income	29,770	29,301	159,741
Less net income (loss) attributable to non-controlling interests	93	(241)	0
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 29,677	$ 29,542	$ 159,741