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Supplemental Guarantor Consolidated Financial Statements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012
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