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Regulatory Requirements - Additional Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2021 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	$ 314,400,000
Aggregate indebtedness	25.75%
Excess capital	$ 290,000,000.0
Freedom
Regulatory Capital Requirements [Line Items]
Net Capital	$ 4,800,000
Aggregate indebtedness	6.67%
Freedom maintain net capital equal to the greater	$ 100,000
Net capital in excess of minimum required	$ 4,700,000
Oppenheimer Europe Ltd
Regulatory Capital Requirements [Line Items]
Common Equity Tier 1 Ratio	0.1654	0.1654
Common Equity Tier 1 Ratio Required	4.50%	4.50%
Tier 1 Capital Ratio Required	6.00%	6.00%
Total Capital Ratio	22.06%	22.06%
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	$ 385,887

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Common Equity Tier One Ratio required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

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Percentage of net capital to aggregate indebtedness.

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Tier One Capital Ratio required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

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Total Capital Ratio calculated for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

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Total Capital Ratio Required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

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Amount of net capital in excess of minimum required net capital, calculated under Alternative Standard.

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Minimum amount of net capital required to be maintained by broker-dealer and its subsidiary, calculated under Aggregate Indebtedness Standard.

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Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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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

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