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Regulatory Requirements - Additional Information (Narrative) (Details) | 1 Months Ended | 9 Months Ended |
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Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€)
Oppenheimer [Member] |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Required percentage of net capital to aggregate customer-related debit items |  | $ 0.02 |
Net Capital as Reported in Entity's Part II Unaudited FOCUS Report |  | $ 184,300,000 |
Aggregate indebtedness |  | 19.11% |
Excess capital |  | $ 165,000,000 |
Freedom |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Net Capital as Reported in Entity's Part II Unaudited FOCUS Report |  | $ 5,300,000 |
Aggregate indebtedness |  | 6.67% |
Freedom maintain net capital equal to the greater |  | $ 100,000 |
Net capital in excess of minimum required |  | $ 5,200,000.0 |
Oppenheimer Europe Ltd |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Common Equity Tier 1 Ratio |  | 15.27% | 15.27%
Common Equity Tier 1 Ratio Required |  | 4.50% | 4.50%
Tier 1 Capital Ratio |  | 15.27% | 15.27%
Tier 1 Capital Ratio Required |  | 6.00% | 6.00%
Total Capital Ratio |  | 15.81% | 15.81%
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 |  | $ 383,000 |
Net capital |  | 1,900,000 |
Excess Liquid Capital under Hong Kong SFC Rules |  | $ 1,500,000 |
Oppenheimer Europe Ltd |  |  |
Regulatory Capital Requirements [Line Items] |  |  |
Contributions to subsidiary | $ 7,000,000 |  |

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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 Tier One 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 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 The amount of net capital in excess of the alternative minimum required net capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework. + References No definition available. + Details
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- Definition The amount of net capital in excess of the minimum required net capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Amount of minimum net capital required to be maintained to engage in securities transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 entity's broker-dealer subsidiary to engage in securities transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition This element represents the amount of net capital of a broker or dealer that has elected not to be subject to the Aggregate Indebtedness Standard (as defined). The amount of net capital represented by this element is the greater of $250,000 or two percent of aggregate debit items computed in accordance with the Formula for Determination of Reserve Requirements for Brokers and Dealers (as defined). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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