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Regulatory Requirements - Additional Information (Detail) (USD $) | 9 Months Ended | 3 Months Ended |
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Sep. 30, 2014 Oppenheimer [Member] | Sep. 30, 2014 Freedom [Member] | Sep. 30, 2014 Oppenheimer Investments Asia [Member] | Sep. 30, 2014 Oppenheimer Europe Ltd [Member] Basel Three New Requirements [Member]
Regulatory Capital Requirements [Line Items] |  |  |  |
Required percentage of net capital to aggregate customer-related debit items | 2.00% |  |  |
Initial capital | $ 157,900,000 | $ 4,800,000 | $ 3,100,000 |
Actual percentage of net capital to aggregate customer-related debit items | 11.80% |  |  |
Excess capital | 131,200,000 |  |  |
Freedom maintain net capital equal to the greater |  | 250,000 |  |
Aggregate indebtedness |  | 6.67% |  |
Net capital in excess of minimum required |  | 4,500,000 | 2,700,000 |
Cash and securities segregated for regulatory and other purposes |  | 18,300,000 |  |
Initial required capital |  |  | $ 386,000 |
Common equity Tier 1 capital ratio |  |  |  | 8.93%
Common equity Tier 1 required |  |  |  | 4.50%
Tier 1 capital ratio |  |  |  | 8.93%
Tier 1 capital ratio required |  |  |  | 6.00%
Total capital ratio |  |  |  | 10.38%
Total capital ratio required |  |  |  | 8.00%

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- Definition Actual percentage of net capital to aggregate customer related debit items. + References No definition available. + Details
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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 Common Equity Tier 1 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 Percentage of net capital to aggregate indebtedness. + References No definition available. + Details
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- Definition Required percentage of net capital to aggregate customer related debit items. + 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://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph ii -Article 15c3 -Subsection a + Details
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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to regulations other than SEC Regulations and the Commodity Exchange Act. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
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- Definition The amount of net capital in excess of the minimum required net capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph i -Article 15c3 -Subsection a + Details
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- Definition Amount of minimum net capital required to be maintained to engage in securities transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph i -Article 15c3 -Subsection a + 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://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph i -Article 15c3 -Subsection a + Details
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- Definition Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph ii -Article 15c3 -Subsection a + Details
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