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Regulatory requirements (Details)	3 Months Ended
	Mar. 31, 2025 USD ($)
Regulatory Capital Requirements [Line Items]
Regulatory capital required to be maintained	$ 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	$ 384,100,000
Aggregate indebtedness (as a percent)	26.73%
Excess capital	$ 355,400,000
Freedom
Regulatory Capital Requirements [Line Items]
Net capital	$ 3,700,000
Aggregate indebtedness (as a percent)	6.67%
Freedom maintain net capital equal to the greater	$ 100,000
Net capital in excess of minimum required	$ 3,600,000
Oppenheimer Europe Ltd
Regulatory Capital Requirements [Line Items]
Common equity tier 1 ratio (as a percent)	124.00%
Common equity tier 1 ratio required (as a percent)	56.00%
Tier 1 capital ratio required (as a percent)	75.00%
Total capital ratio (as a percent)	166.00%
Total capital ratio required (as a percent)	100.00%
Oppenheimer Investments Asia Ltd.
Regulatory Capital Requirements [Line Items]
Net capital	$ 3,000,000.0
Excess liquid capital under hong kong SFC rules	2,600,000
Regulatory capital required to be maintained	$ 385,718

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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