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Regulatory Requirements - Additional Information (Detail) (USD $) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Oppenheimer [Member] | Sep. 30, 2013 Freedom [Member] | Sep. 30, 2013 Oppenheimer Europe Ltd [Member] | Sep. 30, 2013 Oppenheimer Investments Asia Ltd. [Member]
Regulatory Capital Requirements [Line Items] |  |  |  |  |  |
Required percentage of net capital to aggregate customer-related debit items |  |  | 2.00% |  |  |
Net capital |  |  | $ 159,000,000 | $ 4,500,000 | $ 5,300,000 | $ 1,300,000
Actual percentage of net capital to aggregate customer-related debit items |  |  | 12.20% |  |  |
Excess capital |  |  | 132,800,000 |  |  |
Freedom maintain net capital equal to the greater |  |  |  | 250,000 |  |
Aggregate indebtedness |  |  |  | 6.67% |  |
Net capital in excess of minimum required |  |  |  | 4,200,000 | 1,900,000 | 905,000
Cash and securities segregated for regulatory and other purposes | 36,569,000 | 33,000,000 | 17,400,000 | 18,300,000 |  |
Regulatory capital required to be maintained |  |  |  |  | $ 3,400,000 | $ 387,000

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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 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 Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers). + 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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