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Financial Instruments - Notional and Fair Values of TBAs (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Of To Be Announced Securities [Abstract]
FHA loan commitments balance	$ 266.3	$ 304.4
Loan receivable balance of OMHHF, included in other assets in balance sheet	$ 65.8	$ 22.9

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- Details

Name:	opy_FairValueOfToBeAnnouncedSecuritiesAbstract
Namespace Prefix:	opy_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

This balance represents a loan commitment that the company commits to provide to fund the FHA loans.

+ References

No definition available.

+ Details

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

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- Definition

This represents the prior loan commitments that have been funded but not yet been securitized.

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No definition available.

+ Details

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