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Employee compensation plans - Narrative (Details) |  |  |  | 12 Months Ended |
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Jan. 29, 2025 shares | Jan. 05, 2024 shares | Dec. 15, 2021 USD ($) | Dec. 31, 2024 USD ($) plan shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 01, 2024 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of employee compensation plans | plan |  |  |  | 2 |  |  |  |
Stock options outstanding (in shares) | shares |  |  |  | 0 | 2,447 |  |  |
Maximum annual contribution under Defined Contribution Plan |  |  |  | $ 23,000 | $ 22,500 | $ 20,500 |  |
Employer contribution to Defined Contribution Plan |  |  |  | 4,900,000 | 4,400,000 | 4,300,000 |  |
Deferred bonus amounts |  |  |  |  |  |  | $ 13,400,000 |
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% |  |  |  |  |
Deferred compensation plans cost |  |  |  | $ 38,700,000 | 33,600,000 | 5,300,000 |  |
Class A Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available under the share-based compensation plans (in shares) | shares |  |  |  | 999,000 |  |  |  | 1,000,000
Restricted Stock | Class A Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of non-option awards |  |  |  | $ 92,000,000.0 |  |  |  |
Compensation expense relating to the share-based awards |  |  |  | 12,900,000 | $ 13,100,000 | 11,500,000 |  |
Unrecognized compensation cost related to unvested share-based compensation |  |  |  | $ 20,300,000 |  |  |  |
Weighted Average Remaining Contractual Life |  |  |  | 1 year 7 months 6 days | 1 year 7 months 6 days |  |  |
Non-option awards granted (in shares) | shares |  |  |  | 330,140 |  |  |  |
Vested (in shares) | shares |  |  |  | 463,175 |  |  |  |
Non-option equity instruments, unvested (in shares) | shares |  |  |  | 1,434,968 | 1,589,414 |  |  |
Restricted Stock | Class A Stock | Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
Non-option awards granted (in shares) | shares | 203,375 |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense relating to the share-based awards |  |  |  | $ 2,550,000 | $ 8,195,000 | 15,702,000 |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  | 5 years |  | 5 years |  |  |  |
Aggregate intrinsic value of non-option awards |  |  |  | $ 65,300,000 |  |  |  |
Compensation expense relating to the share-based awards |  |  |  | $ 32,600,000 | 3,900,000 | 4,400,000 |  |
Weighted Average Remaining Contractual Life |  |  |  | 3 years |  |  |  |
Non-option awards granted (in shares) | shares |  | 654,280 |  |  |  |  |  |
Non-option equity instruments, unvested (in shares) | shares |  |  |  | 2,642,736 |  |  |  |
Liability related to the non-option equity awards |  |  |  | $ 46,900,000 |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 27,500,000 |  |  |  |
Minimum | Restricted Stock | Class A Stock | Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
Maximum | Restricted Stock | Class A Stock | Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period | 5 years |  |  |  |  |  |  |
Third Anniversary | Restricted Stock | Class A Stock | Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-option awards granted (in shares) | shares | 105,675 |  |  |  |  |  |  |
Fifth Anniversary | Restricted Stock | Class A Stock | Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested (in shares) | shares | 97,700 |  |  |  |  |  |  |
Oppenheimer Holdings 2014 Incentive Plan (OIP) | Minimum | Class A Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |  |
Oppenheimer Holdings 2014 Incentive Plan (OIP) | Maximum | Class A Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 5 years |  |  |  |
Executive Deferred Compensation Plan and Deferred Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Deferred bonus amounts |  |  |  | $ 12,100,000 | $ 10,100,000 | $ 11,100,000 |  |
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 |  |  |  | $ 77,800,000 |  |  |  |
CIBC Deferred Compensation Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Company's deferred compensation liability |  |  |  | $ 22,400,000 |  |  |  |

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