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Employee compensation plans - Narrative (Details)				12 Months Ended
Employee compensation plans - Narrative (Details)	Jan. 25, 2023 shares	Jan. 06, 2023 shares	Dec. 15, 2021 USD ($)	Dec. 31, 2022 USD ($) plan shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employee compensation plans \| plan				2
Stock options outstanding (in shares) \| shares				5,233	10,770
Maximum annual contribution under Defined Contribution Plan				$ 20,500	$ 19,500	$ 19,500
Employer contribution to Defined Contribution Plan				4,300,000	4,300,000	3,500,000
Deferred bonus amounts				$ 9,300,000
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%
Deferred compensation plans cost				$ 5,300,000	18,400,000	18,100,000
Class A Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of Class A Stock available \| shares				386,290
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				11,500,000	$ 10,500,000	7,700,000
Unrecognized compensation cost related to unvested share-based compensation				$ 23,100,000
Weighted Average Remaining Contractual Life				1 year 10 months 24 days	2 years 2 months 12 days
Restricted stock awarded (in shares) \| shares				403,823
Restricted stock vested (in shares) \| shares				156,477
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
Restricted stock awarded (in shares) \| shares	274,140
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense relating to the share-based awards				$ 15,702	$ 21,669	25,300
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense relating to the share-based awards				$ 4,400,000	20,600,000	8,500,000
Outstanding OARs were unvested \| shares				2,648,512
Aggregate intrinsic value of OARs outstanding and expected to vest				$ 27,700,000
Liability related to the OARs				23,900,000
Total unrecognized compensation cost				$ 17,700,000
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		522,190
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	157,660
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	116,480
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				$ 11,100,000	$ 12,800,000	$ 10,000,000
Vesting period of deferred bonus				5 years
Executive Deferred Compensation Plan, Deferred Incentive Plan And Capital Markets Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's deferred compensation liability				$ 53,600,000
CIBC Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's deferred compensation liability				$ 16,800,000