CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 147,959	$ 71,247	$ 30,272
Other comprehensive income (loss), net of tax
Currency translation adjustment	3,006	(223)	(502)
Comprehensive income	150,965	71,024	29,770
Net income (loss) attributable to non-controlling interests	(444)	(310)	93
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 151,409	$ 71,334	$ 29,677