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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
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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
Period Type: | duration

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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. + References No definition available. + Details
Name: | opy_LoanPurchasedUnderCommitmentFromFederalHousingAdministration
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant