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Employee compensation plans - Narrative (Details) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
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 |  |

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