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Regulatory Requirements - Additional Information (Narrative) (Details) | 9 Months Ended |
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Sep. 30, 2020 USD ($) | Sep. 30, 2020 EUR (€)
Regulatory Capital Requirements [Line Items] |  |
Net capital | $ 3,500,000 |
Excess Liquid Capital under Hong Kong SFC Rules | 3,100,000 |
Oppenheimer [Member] |  |
Regulatory Capital Requirements [Line Items] |  |
Required percentage of net capital to aggregate customer-related debit items | 0.02 |
Net Capital | $ 268,700,000 |
Aggregate indebtedness | 20.83% |
Excess capital | $ 242,900,000 |
Freedom |  |
Regulatory Capital Requirements [Line Items] |  |
Net Capital | $ 4,900,000 |
Aggregate indebtedness | 6.67% |
Freedom maintain net capital equal to the greater | $ 100,000 |
Net capital in excess of minimum required | $ 4,800,000 |
Oppenheimer Europe Ltd |  |
Regulatory Capital Requirements [Line Items] |  |
Common Equity Tier 1 Ratio | 0.2087 | 0.2087
Common Equity Tier 1 Ratio Required | 4.50% | 4.50%
Tier 1 Capital Ratio | 20.87% | 20.87%
Tier 1 Capital Ratio Required | 6.00% | 6.00%
Total Capital Ratio | 27.83% | 27.83%
Total Capital Ratio Required | 8.00% | 8.00%
Regulatory capital required to be maintained | € |  | € 730,000
Oppenheimer Investments Asia Ltd. |  |
Regulatory Capital Requirements [Line Items] |  |
Regulatory capital required to be maintained | $ 387,089 |

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- Definition Common Equity Tier One Ratio required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union. + References No definition available. + Details
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- Definition Excess Liquid Capital under Hong Kong SFC Rules + References No definition available. + Details
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- Definition Liquid Capital under Hong Kong SFC Rules + References No definition available. + Details
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- Definition Percentage of net capital to aggregate indebtedness. + References No definition available. + Details
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- Definition Tier One Capital Ratio calculated for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union. + References No definition available. + Details
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- Definition Total Capital Ratio calculated for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union. + References No definition available. + Details
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- Definition Total Capital Ratio Required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union. + References No definition available. + Details
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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 -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Amount of net capital in excess of minimum required net capital, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + 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 -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Minimum amount of net capital required to be maintained by broker-dealer subsidiary to engage in security transaction, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Minimum amount of net capital of broker-dealer parent, calculated under Alternative Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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