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Fair Value Measurements - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 1,684 opy_GainLossOnDerivativesPreTaxRecognizedInIncome | $ 1,473 opy_GainLossOnDerivativesPreTaxRecognizedInIncome
Commodity Contracts | U.S. treasury futures | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (1,687)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_UsTreasuryFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember | 906 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_UsTreasuryFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember
Commodity Contracts | Federal funds futures | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (272)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_FederalFundsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember | (289)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_FederalFundsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember
Commodity Contracts | Euro Dollars Futures | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (161)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_EuroDollarsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember | 5 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_EuroDollarsFuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember
Commodity Contracts | General collateral futures | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 11 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_GeneralcollateralfuturesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember |
Other Contracts | Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 10 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember |
Other Contracts | Other | TBA Sale Agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (5,530)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | 2,021 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember
Other Contracts | Other | Interest rate lock commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 7,632 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | (1,277)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember
Other Contracts | TBAs | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (17)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_ToBeAnnouncedSecurityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember | 61 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_ToBeAnnouncedSecurityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember
Other Contracts | Auction Rate Securities Purchase Commitment | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 1,698 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FairValueByLiabilityClassAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember |
Other Contracts | Auction Rate Securities Purchase Commitment | Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | $ 46 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FairValueByLiabilityClassAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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