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Financial Instruments - Variable Interest Entities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Total VIE Assets	$ 2,172,831	$ 2,039,347
Carrying Value of Variable Interest Assets	316	404
Carrying Value of Variable Interest Liabilities
Capital Commitments	7	8
Maximum Exposure to Loss in Non- consolidated VIEs	323	412
Hedge Funds [Member]
Variable Interest Entity [Line Items]
Total VIE Assets	2,064,368	1,868,178
Carrying Value of Variable Interest Assets	284	372
Carrying Value of Variable Interest Liabilities
Maximum Exposure to Loss in Non- consolidated VIEs	284	372
Private Equity Funds [Member]
Variable Interest Entity [Line Items]
Total VIE Assets	108,463	171,169
Carrying Value of Variable Interest Assets	32	32
Carrying Value of Variable Interest Liabilities
Capital Commitments	7	8
Maximum Exposure to Loss in Non- consolidated VIEs	$ 39	$ 40

X

- Definition

The amount of unfunded capital for which the entity is obligated, to those certain investments for which net asset value per share is calculated.

+ References

No definition available.

+ Details

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Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Variable interest entity assets.

+ References

No definition available.

+ Details

Name:	opy_VariableInterestEntityAssets
Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Difference between the carrying amount of assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the variable interest entity (VIE) and the reporting entity's maximum exposure to loss as a result of its involvement with the VIE, where the reporting entity is not the VIE's primary beneficiary.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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