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Organization - Additional Information (Detail)	Dec. 31, 2013 Jurisdictions
Organization And Basis Of Presentation [Line Items]
Number of foreign jurisdiction	5
United States [Member]
Organization And Basis Of Presentation [Line Items]
Number of offices providing services	96
Number of states which operates	25

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- Details

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Namespace Prefix:	opy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant