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Fair Value Measurements - Additional Information (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Company purchased and holds auction rate securities $ 98,600,000opy_SecuritiesPurchasesAgainstPurchaseOffersAndLegalSettlement  
Commitment to purchase ARS from clients through 2016 12,200,000opy_SecuritiesCommittedToPurchaseAmount  
Valuation adjustment (unrealized loss) for ARS 8,030,000opy_ValuationAdjustmentForLevelThreeAssets  
Loan position held in secondary loan trading portfolio 0opy_LoanPositionHeldInSecondaryLoanTradingPortfolioFairValue 0opy_LoanPositionHeldInSecondaryLoanTradingPortfolioFairValue
Fair value of the reverse repurchase agreements 250,000,000opy_FairValueOfSecuritiesReverseRepurchaseAgreement [1] 184,000,000opy_FairValueOfSecuritiesReverseRepurchaseAgreement [1]
Fair value of the repurchase agreements 0opy_FairValueOfSecuritiesRepurchaseAgreement  
Loans held for sale period 60 days  
Book value of loan held for sale 18,400,000opy_LoansHeldForSaleCarryingValue  
Fair value of loan held for sale 19,243,000us-gaap_LoansHeldForSaleFairValueDisclosure 75,989,000us-gaap_LoansHeldForSaleFairValueDisclosure
Forward or delayed delivery of the underlying instrument with settlement 180 days  
Auction rate securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Auction rate securities valuation adjustment 8,000,000us-gaap_AssetsFairValueAdjustment
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= us-gaap_AuctionRateSecuritiesMember		  
Auction Rate Securities Purchase Commitment    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Auction rate securities valuation adjustment 902,000us-gaap_AssetsFairValueAdjustment
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember		  
Auction Rate Securities Owned    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation adjustment (unrealized loss) for ARS 7,128,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2]  
Senior Secured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
Auction rate securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
ARS held in proprietary trading account result of the failed auctions 150,000opy_AuctionRateSecuritiesInFirmProprietaryAccount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember		  
Valuation adjustment (unrealized loss) for ARS 7,100,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember		  
Assets and liabilities transferred from level one and level two 0opy_AssetsAndLiabilitiesTransferredFromLevelOneToLevelTwo
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember		 0opy_AssetsAndLiabilitiesTransferredFromLevelOneToLevelTwo
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
Auction rate securities | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commitment to purchase ARS period maximum 2016  
Auction rate securities | Range One    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Basis point 0.25%opy_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesChangeInDiscountRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
/ us-gaap_RangeAxis
= opy_RangeOneMember		  
Auction rate securities | Range Two    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Basis point 0.50%opy_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesChangeInDiscountRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
/ us-gaap_RangeAxis
= opy_RangeTwoMember		  
Fair Value, Valuation Scenario One | Auction rate securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Decrease in fair value of ARS 941,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= opy_FairValueValuationScenarioOneMember		  
Fair Value, Valuation Scenario Two | Auction rate securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Decrease in fair value of ARS 1,900,000us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AuctionRateSecuritiesMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= opy_FairValueValuationScenarioTwoMember		  
Private Equity Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments Lock In Period 10 years  
Auction Rate Preferred Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U S Treasury Rate 1.36%opy_USTreasuryRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember		  
Auction Rate Preferred Securities | Auction Rate Securities Owned    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation adjustment (unrealized loss) for ARS 4,339,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2]  
Auction Rate Preferred Securities | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread To U S Treasury Rate 110.00%opy_SpreadToUSTreasuryRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Auction Rate Preferred Securities | Minimum | Auction Rate Securities Purchase Commitment    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 1.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember		 [3],[4]  
Auction Rate Preferred Securities | Minimum | Auction Rate Securities Owned    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 1.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2],[4]  
Auction Rate Preferred Securities | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread To U S Treasury Rate 150.00%opy_SpreadToUSTreasuryRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Auction Rate Preferred Securities | Maximum | Auction Rate Securities Purchase Commitment    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 2.04%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember		 [3],[4]  
Auction Rate Preferred Securities | Maximum | Auction Rate Securities Owned    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 2.04%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2],[4]  
Municipal Auction Rate Securities 01    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread To U S Treasury Rate 175.00%opy_SpreadToUSTreasuryRate
/ us-gaap_InvestmentTypeAxis
= opy_MunicipalAuctionRateSecurities01Member		  
U S Treasury Rate 1.51%opy_USTreasuryRate
/ us-gaap_InvestmentTypeAxis
= opy_MunicipalAuctionRateSecurities01Member		  
Municipal Auction Rate Securities 01 | Auction Rate Securities Owned    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 2.64%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= opy_MunicipalAuctionRateSecurities01Member
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2],[5]  
Valuation adjustment (unrealized loss) for ARS 1,157,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_InvestmentTypeAxis
= opy_MunicipalAuctionRateSecurities01Member
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2]  
Student Loan Auction Rate Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread To U S Treasury Rate 1.20%opy_SpreadToUSTreasuryRate
/ us-gaap_InvestmentTypeAxis
= opy_StudentLoanAuctionRateSecuritiesMember		  
U S Treasury Rate 1.97%opy_USTreasuryRate
/ us-gaap_InvestmentTypeAxis
= opy_StudentLoanAuctionRateSecuritiesMember		  
Student Loan Auction Rate Securities | Auction Rate Securities Purchase Commitment    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 3.17%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= opy_StudentLoanAuctionRateSecuritiesMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember		 [3],[6]  
Student Loan Auction Rate Securities | Auction Rate Securities Owned    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Permanent and construction loans , discount rate 3.17%us-gaap_FairValueInputsDiscountRate
/ us-gaap_InvestmentTypeAxis
= opy_StudentLoanAuctionRateSecuritiesMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2],[6]  
Valuation adjustment (unrealized loss) for ARS 66,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_InvestmentTypeAxis
= opy_StudentLoanAuctionRateSecuritiesMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_AuctionRateSecuritiesOwnedMember		 [2]  
Mortgage Servicing Rights    
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		  
Auction Rate Securities Purchase Commitment    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation adjustment (unrealized loss) for ARS 902,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_FairValueByLiabilityClassAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember		 [2]  
Auction Rate Securities Purchase Commitment | Auction Rate Securities Purchase Commitment    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation adjustment (unrealized loss) for ARS 902,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_FairValueByLiabilityClassAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember		  
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation adjustment (unrealized loss) for ARS 410,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_FairValueByLiabilityClassAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRatePreferredSecuritiesMember		 [3]  
Auction Rate Securities Purchase Commitment | Student Loan Auction Rate Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Valuation adjustment (unrealized loss) for ARS 82,000opy_ValuationAdjustmentForLevelThreeAssets
/ us-gaap_FairValueByLiabilityClassAxis
= opy_AuctionRateSecuritiesPurchaseCommitmentMember
/ us-gaap_InvestmentTypeAxis
= opy_StudentLoanAuctionRateSecuritiesMember		 [3]  
Deferred Compensation Share Based Payments | Corporate Equities Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of the corporate equities that are included in securities owned $ 15,700,000opy_FairValueOfCorporateEquitiesThatAreIncludedInSecuritiesOwned
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_CorporateEquitiesLiabilitiesMember		 $ 15,300,000opy_FairValueOfCorporateEquitiesThatAreIncludedInSecuritiesOwned
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
/ us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis
= opy_CorporateEquitiesLiabilitiesMember
[1] Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.
[2] Principal amount represents the par value of the ARS and is included in securities owned in the consolidated balance sheet at December 31, 2014. The valuation adjustment amount is included as a reduction to securities owned in the consolidated balance sheet at December 31, 2014.
[3] Principal amount represents the present value of the ARS par value that the Company is committed to purchase at a future date. This principal amount is presented as an off-balance sheet item. The valuation adjustment amount is included in accounts payable and other liabilities on the consolidated balance sheet at December 31, 2014.(7)
[4] Derived by applying a multiple to the spread between 110% to 150% to the U.S. Treasury rate of 1.36%.
[5] Derived by applying a multiple to the spread of 175% to the U.S. Treasury rate of 1.51%.
[6] Derived by applying the sum of the spread of 1.20% to the U.S. Treasury rate of 1.97%.