CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 21,674	$ 10,266	$ 52,329	$ 36,010
Other comprehensive income (loss), net of tax
Currency translation adjustment	2,146	(580)	1,659	(967)
Comprehensive income	23,820	9,686	53,988	35,043
Less net loss attributable to noncontrolling interests	0	0	0	(310)
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 23,820	$ 9,686	$ 53,988	$ 35,353