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Employee compensation plans - Narrative (Details)				12 Months Ended
Employee compensation plans - Narrative (Details)	Jan. 26, 2022 shares	Jan. 07, 2022 shares	Dec. 15, 2021 USD ($)	Dec. 31, 2021 USD ($) plan shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employee compensation plans \| plan				2
Stock options outstanding (in shares) \| shares				10,770	14,209
Maximum annual contribution under Defined Contribution Plan				$ 19,500	$ 19,500	$ 19,000
Employer contribution to Defined Contribution Plan				4,300,000	3,500,000	2,400,000
Deferred bonus amounts				26,400,000
Deferred compensation plans cost				$ 18,400,000	18,100,000	19,400,000
Minimum bonus and salary amount			$ 200,000
Vesting period				3 years
Bonus deferral credit, minimum salary and bonus amount			$ 500,000
Deferral of salary and bonus (as a percent)			50.00%
Elective deferral credit period one			5 years
Elective deferral credit period two			10 years
Elective deferral credit, amount vested (as a percent)			100.00%
Matching credit (as a percent)			10.00%
Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of Class A Stock available \| shares				689,140
Restricted Stock \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of ESP awards outstanding				$ 71,500,000
Compensation expense relating to the share-based awards				10,500,000	$ 7,700,000	8,100,000
Unrecognized compensation cost related to unvested share-based compensation				$ 21,800,000
Remaining contractual life, Non-vested				2 years 2 months 12 days	1 year 10 months 24 days
Restricted stock awarded (in shares) \| shares				631,390
Restricted stock vested (in shares) \| shares				376,139
Restricted Stock \| Subsequent Event \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded (in shares) \| shares	362,823
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense relating to the share-based awards				$ 21,669	$ 25,300	26,200
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense relating to the share-based awards				20,600,000	8,500,000	3,700,000
Aggregate intrinsic value of OARs outstanding and expected to vest				47,400,000
Liability related to the OARs				29,800,000
Total unrecognized compensation cost				$ 22,100,000
Share Based Compensation Arrangement By Cash Payment Award Stock Appreciation Rights unvested amount \| shares				2,458,646
Total Number of OARs outstanding (in shares) \| shares				0
Stock Appreciation Rights (SARs) \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under share based payment		5 years
Number of OARs awarded (in shares) \| shares		647,460
Minimum \| Restricted Stock \| Subsequent Event \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under share based payment	3 years
Maximum \| Restricted Stock \| Subsequent Event \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under share based payment	5 years
Third Anniversary \| Restricted Stock \| Subsequent Event \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded (in shares) \| shares	129,548
Fifth Anniversary \| Restricted Stock \| Subsequent Event \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vested (in shares) \| shares	233,275
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term granted for options				5 years
Expiration period				6 months
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Minimum \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under share based payment				3 years
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Maximum \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under share based payment				5 years
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Second Anniversary \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage under share based payment				25.00%
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Third Anniversary \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage under share based payment				25.00%
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Fourth Anniversary \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage under share based payment				25.00%
Oppenheimer Holdings 2014 Incentive Plan (OIP) \| Six Months Before Expiration \| Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage under share based payment				25.00%
Oppenheimer Holdings Inc. Stock Appreciation Right Plan \| Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under share based payment				5 years
Executive Deferred Compensation Plan and Deferred Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred bonus amounts				$ 12,800,000	$ 10,000,000	$ 9,300,000
Vesting period of deferred bonus				5 years
Company's deferred compensation liability				$ 56,100,000
CIBC Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's deferred compensation liability				$ 24,300,000