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Regulatory Requirements - Additional Information (Narrative) (Details) | 3 Months Ended |
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Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€)
Regulatory Capital Requirements [Line Items] |  |
Net capital | $ 878,000 |
Excess Liquid Capital under Hong Kong SFC Rules | 496,000 |
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 | $ 202,400,000 |
Aggregate indebtedness | 26.30% |
Excess capital | $ 187,000,000 |
Freedom |  |
Regulatory Capital Requirements [Line Items] |  |
Net Capital as Reported in Entity's Part II Unaudited FOCUS Report | $ 5,200,000 |
Aggregate indebtedness | 6.67% |
Freedom maintain net capital equal to the greater | $ 100,000 |
Net capital in excess of minimum required | $ 5,100,000.0 |
Oppenheimer Europe Ltd |  |
Regulatory Capital Requirements [Line Items] |  |
Common Equity Tier 1 Ratio | 11.03% | 11.03%
Common Equity Tier 1 Ratio Required | 4.50% | 4.50%
Tier 1 Capital Ratio | 11.03% | 11.03%
Tier 1 Capital Ratio Required | 6.00% | 6.00%
Total Capital Ratio | 11.31% | 11.31%
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 | $ 382,000 |

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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 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 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 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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