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Regulatory Requirements (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Net Capital Requirements (Textual) [Abstract]
Actual Percentage of net capital to aggregate customer-related debit items	11.80%
Freedom maintain net capital equal to the greater	$ 250,000
Aggregate indebtedness	6.67%
Cash and securities segregated for regulatory and other purposes	32,487,000	30,086,000
Oppenheimer [Member]
Net Capital Requirements (Textual) [Abstract]
Required Percentage of net capital to aggregate customer-related debit items	2.00%
Net Capital	142,300,000
Excess net capital	118,300,000
Cash and securities segregated for regulatory and other purposes	17,400,000
Freedom [Member]
Net Capital Requirements (Textual) [Abstract]
Net Capital	4,800,000
Excess net capital	4,600,000
Cash and securities segregated for regulatory and other purposes	14,900,000
Oppenheimer Europe [Member]
Net Capital Requirements (Textual) [Abstract]
Net Capital	5,000,000
Excess net capital	1,500,000
Regulatory capital required to be maintained	3,500,000
Oppenheimer Investments Asia [Member]
Net Capital Requirements (Textual) [Abstract]
Net Capital	1,100,000
Excess net capital	753,000
Regulatory capital required to be maintained	$ 386,000

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- Definition

Actual percentage of net capital to aggregate customer related debit items.

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Percentage of net capital to aggregate indebtedness.

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Required percentage of net capital to aggregate customer related debit items.

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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

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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.



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-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.

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The amount of net capital in excess of the minimum required net capital.

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Amount of minimum net capital required to be maintained to engage in securities transactions.

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Minimum amount of net capital required to be maintained by entity's broker-dealer subsidiary to engage in securities transactions.

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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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 80

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-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.

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