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Regulatory Requirements - Additional Information (Detail) (USD $)			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Oppenheimer [Member]	Mar. 31, 2014 Freedom [Member]	Mar. 31, 2014 Oppenheimer Investments Asia Ltd. [Member]	Mar. 31, 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			$ 168,000,000	$ 4,500,000	$ 2,200,000	$ 4,800,000
Actual percentage of net capital to aggregate customer-related debit items			12.50%
Excess capital			141,200,000
Freedom maintain net capital equal to the greater				250,000
Aggregate indebtedness				6.67%
Net capital in excess of minimum required				4,300,000	1,900,000
Cash and securities segregated for regulatory and other purposes	36,281,000	36,323,000	14,500,000	20,900,000
Initial required capital					$ 387,000	$ 68,000
Common equity Tier 1 capital ratio						10.81%
Common equity Tier 1 required						4.50%
Tier 1 capital ratio						10.81%
Tier 1 capital ratio required						6.00%
Total capital ratio						12.49%
Total capital ratio required						8.00%

X

- Definition

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

+ References

No definition available.

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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

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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

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- Definition

Percentage of net capital to aggregate indebtedness.

+ References

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

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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

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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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Total Capital Ratio calculated for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

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Total Capital Ratio Required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

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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

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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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 240

-Section 1

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-Article 15c3

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 240

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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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-Name Rule 15c3

-Number 240

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-Article 15c3

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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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-Number 240

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