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Regulatory requirements (Details) | 12 Months Ended |
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Dec. 31, 2023 USD ($) | Jan. 31, 2022 GBP (£) | Jan. 31, 2022 EUR (€)
Regulatory Capital Requirements [Line Items] |  |  |
Minimum capital required | $ 4,150,000 |  |
Oppenheimer |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Required percentage of net capital to aggregate customer-related debit items (as a percent) | 2.00% |  |
Net capital | $ 453,600,000 |  |
Aggregate indebtedness (as a percent) | 48.86% |  |
Excess capital | $ 435,000,000.0 |  |
Freedom |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Net capital | $ 4,100,000 |  |
Aggregate indebtedness (as a percent) | 6.67% |  |
Freedom maintain net capital equal to the greater | $ 100,000 |  |
Net capital in excess of minimum required | $ 4,000,000 |  |
Oppenheimer Europe Ltd |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Regulatory capital required to be maintained |  | £ 750,000 | € 730,000
Oppenheimer Europe Ltd | Basel Three New Requirements |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Common Equity Tier 1 ratio (as a percent) | 134.00% |  |
Common Equity Tier 1 ratio required (as a percent) | 56.00% |  |
Tier 1 Capital ratio (as a percent) | 134.00% |  |
Tier 1 Capital ratio required (as a percent) | 75.00% |  |
Total Capital ratio (as a percent) | 182.00% |  |
Total Capital ratio required (as a percent) | 100.00% |  |
Oppenheimer Investments Asia Ltd. |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Regulatory capital required to be maintained | $ 384,120 |  |
Regulatory capital | 4,000,000 |  |
Excess Liquid Capital under Hong Kong SFC rules | $ 3,600,000 |  |

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- Definition Amount of net capital in excess of minimum required net capital, calculated under Alternative Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
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- Definition Minimum amount of net capital required to be maintained by broker-dealer and its subsidiary, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
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