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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 | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 1,521 opy_GainLossOnDerivativesPreTaxRecognizedInIncome | $ (5,475)opy_GainLossOnDerivativesPreTaxRecognizedInIncome
Commodity Contracts [Member] | Future [Member] | Principal Transaction Revenue [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (1,480)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember | (673)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember
Other Contracts [Member] | Principal Transaction Revenue [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 105 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 395 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Other Contracts [Member] | Other [Member] | Tba Sale Agreements [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (1,619)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | (4,325)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember
Other Contracts [Member] | Other [Member] | Interest Rate Lock Commitments [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 4,526 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | (86)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember
Other Contracts [Member] | Foreign Exchange Forward [Member] | Other [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 3 opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember |
Other Contracts [Member] | To Be Announced Security [Member] | Principal Transaction Revenue [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (14)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_ToBeAnnouncedSecurityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember | $ (786)opy_GainLossOnDerivativesPreTaxRecognizedInIncome / us-gaap_DerivativeByNatureAxis = opy_ToBeAnnouncedSecurityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_PrincipalOrProprietaryTransactionsMember

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- Definition Gain (loss) on derivatives pre tax recognized in income. + References No definition available. + Details
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