Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 4,665	$ 26,250	$ 9,723	$ 96,067
Other comprehensive income (loss), net of tax
Currency translation adjustment	(410)	235	(3,062)	(64)
Comprehensive income	4,255	26,485	6,661	96,003
Less net income (loss) attributable to noncontrolling interests	145	0	(215)	0
Comprehensive income attributable to Oppenheimer Holdings Inc.	$ 4,110	$ 26,485	$ 6,876	$ 96,003