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Regulatory requirements - Additional Information (Detail) (USD $) | 9 Months Ended |
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Sep. 30, 2012 | Dec. 31, 2011
Schedule Of Compliance With Regulatory Capital Requirements Under Brokers And Dealers [Line Items] |  |
Actual percentage of net capital to aggregate customer-related debit items | 14.63% |
Freedom maintain net capital equal to the greater | $ 250,000 |
Aggregate indebtedness | 6.67% |
Cash and securities segregated for regulatory and other purposes | 29,142,000 | 30,086,000
Oppenheimer [Member] |  |
Schedule Of Compliance With Regulatory Capital Requirements Under Brokers And Dealers [Line Items] |  |
Required percentage of net capital to aggregate customer-related debit items | 2.00% |
Net capital | 163,400,000 |
Excess net capital | 141,100,000 |
Cash and securities segregated for regulatory and other purposes | 12,500,000 |
Freedom [Member] |  |
Schedule Of Compliance With Regulatory Capital Requirements Under Brokers And Dealers [Line Items] |  |
Net capital | 4,800,000 |
Excess net capital | 4,500,000 |
Cash and securities segregated for regulatory and other purposes | 15,700,000 |
Oppenheimer Europe [Member] |  |
Schedule Of Compliance With Regulatory Capital Requirements Under Brokers And Dealers [Line Items] |  |
Net capital | 4,200,000 |
Excess net capital | 800,000 |
Regulatory capital required to be maintained | 3,400,000 |
Oppenheimer Investments Asia [Member] |  |
Schedule Of Compliance With Regulatory Capital Requirements Under Brokers And Dealers [Line Items] |  |
Net capital | 1,300,000 |
Excess net capital | 897,000 |
Regulatory capital required to be maintained | $ 387,000 |

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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 AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 21 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 15 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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