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Supplemental Guarantor Condensed Consolidated Financial Statements - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Interest owned by the holding company	100.00%

X

- Definition

The percentage of ownership the holding company owns the guarantors.

+ References

No definition available.

+ Details

Name:	opy_InterestOwnershipByHoldingCompany
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration