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Earnings per share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Basic weighted average number of shares outstanding	11,666,194	12,642,306	12,642,576
Net dilutive effect of share-based awards, treasury stock method (in shares)	941,558	940,522	574,759
Diluted weighted average number of shares outstanding	12,607,752	13,582,828	13,217,335
Net income attributable to Oppenheimer Holdings Inc.	$ 32,351	$ 158,964	$ 122,986
Basic (in dollars per share)	$ 2.77	$ 12.57	$ 9.73
Diluted (in dollars per share)	$ 2.57	$ 11.70	$ 9.30
Class A Stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Number of anti-dilutive stock options granted	4,100	0	10,770

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