CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 24,508	$ 13,779	$ 60,518	$ 18,676
Other comprehensive income (loss), net of tax
Currency translation adjustment	271	(580)	(697)	(1,740)
Comprehensive income	24,779	13,199	59,821	16,936
Less net loss attributable to noncontrolling interests	0	(82)	(310)	(403)
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 24,779	$ 13,281	$ 60,131	$ 17,339