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Fair Value Measurements - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Company purchased and holds auction rate securities	$ 105,300,000opy_SecuritiesPurchasesAgainstPurchaseOffersAndLegalSettlement
Commitment to purchase ARS from clients through 2016	14,200,000opy_SecuritiesCommittedToPurchaseAmount
Valuation adjustment (unrealized loss) for ARS	6,990,000opy_ValuationAdjustmentForLevelThreeAssets
Fair value of the reverse repurchase agreements		250,000,000opy_FairValueOfSecuritiesReverseRepurchaseAgreement
Loans held for sale period	60 days
Fair value of loan held for sale	95,876,000us-gaap_LoansHeldForSaleFairValueDisclosure	19,243,000us-gaap_LoansHeldForSaleFairValueDisclosure
Book value of loan held for sale	87,900,000opy_LoansHeldForSaleCarryingValue
Forward or delayed delivery of the underlying instrument with settlement	180 days
Auction Rate Securities Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	6,193,000opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Deferred Compensation, Share-based Payments [Member] | Corporate Equities Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of the corporate equities that are included in securities owned	14,800,000opy_FairValueOfCorporateEquitiesThatAreIncludedInSecuritiesOwned / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_CorporateEquitiesLiabilitiesMember	15,700,000opy_FairValueOfCorporateEquitiesThatAreIncludedInSecuritiesOwned / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_CorporateEquitiesLiabilitiesMember
Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Permanent and construction loans , discount rate	12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Continuous prepayment rate used up to loans prepayment penalty rate hit 4%	0.00%opy_ContinuousPrepaymentRateUsedBeforeSpecifiedLoansPrepaymentPenaltyRate / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Continuous prepayment rate	4.00%opy_LoansPrepaymentPenaltyRate / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Continuous prepayment rate vast majority range minimum	10.00%opy_ContinuousPrepaymentRateUsedAfterSpecifiedLoansPrepaymentPenaltyRateMinimum / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Continuous prepayment rate vast majority range maximum	15.00%opy_ContinuousPrepaymentRateUsedAfterSpecifiedLoansPrepaymentPenaltyRateMaximum / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Continuous prepayment rate vast majority range average rate	12.00%opy_ContinuousPrepaymentRateUsedAfterSpecifiedLoansPrepaymentPenaltyRateAverage / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Estimated future cost to service loans on an annual basis per loan, average	1,250opy_EstimatedFutureCostToServiceLoansOnAnnualBasisPerLoanAverage / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = opy_MortgageServicingRightsMember
Senior Secured Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Auction Rate Securities [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commitment to purchase ARS period maximum	2017
Auction Rate Securities Purchase Commitment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustment (unrealized loss) for ARS	797,000opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Fair Value, Valuation Scenario Two [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate	0.50%opy_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesChangeInDiscountRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis = opy_FairValueValuationScenarioTwoMember
Decrease in fair value of ARS	2,100,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis = opy_FairValueValuationScenarioTwoMember
Fair Value, Valuation Scenario One [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate	0.25%opy_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesChangeInDiscountRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis = opy_FairValueValuationScenarioOneMember
Decrease in fair value of ARS	$ 1,000,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis = opy_FairValueValuationScenarioOneMember

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Continuous prepayment rate used after specified loans prepayment penalty rate average.

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Estimated future cost to service loans on annual basis per loan average.

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Fair value of corporate equities that are included in securities owned.

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Fair value of securities reverse repurchase agreement.

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Loan held for sale period.

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Loans prepayment penalty rate.

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Maximum settlement period in case of delayed delivery of underlying instrument.

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Securities committed to purchase amount.

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Securities committed to purchase period.

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Securities purchases against purchase offers and legal settlement.

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Valuation adjustment for the level 3 assets used for quantitative disclosure.

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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-Name Accounting Standards Codification

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The hypothetical financial impact of a specified adverse percentage change in discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

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