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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 119,500,000 opy_LevelThreePrincipalAmount
Valuation Adjustment | 6,990,000 opy_ValuationAdjustmentForLevelThreeAssets
Fair Value | 112,510,000 opy_FairValueOfLevelThreeAssets
Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
U S Treasury Rate | 1.13%opy_USTreasuryRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember
Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 175.00%opy_SpreadToUSTreasuryRate / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member
U S Treasury Rate | 1.25%opy_USTreasuryRate / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member
Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 1.20%opy_SpreadToUSTreasuryRate / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember
U S Treasury Rate | 1.71%opy_USTreasuryRate / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember
Hedge Funds [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Investment Redemption Notice Period Minimum | 30 days
Investment Redemption Notice Period Maximum | 120 days
Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 110.00%opy_SpreadToUSTreasuryRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [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 Securities Owned [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 105,250,000 opy_LevelThreePrincipalAmount / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Adjustment | 6,193,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Fair Value | 99,057,000 opy_FairValueOfLevelThreeAssets / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 83,700,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Adjustment | 3,783,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Fair Value | 79,917,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Owned [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 11,575,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Adjustment | 972,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Fair Value | 10,603,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Technique | Discounted Cash Flow
Discount Rate | 2.18%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Duration | 4 years 6 months
Current Yield | 0.21%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Municipal Auction Rate Securities 02 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 5,975,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities02Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Adjustment | 538,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities02Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Fair Value | 5,437,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities02Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Technique | Secondary Market Trading Activity
Observable trades in inactive market for in portfolio securities | 91.00%opy_FairValueInputsObservableTradesInInactiveMarketForInPortfolioSecurities / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities02Member / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 375,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Adjustment | 47,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Fair Value | 328,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Technique | Discounted Cash Flow
Discount Rate | 2.91%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Duration | 7 years
Current Yield | 0.79%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 3,625,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = opy_OtherAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Adjustment | 853,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_OtherAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Fair Value | 2,772,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_OtherAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Valuation Technique | Secondary Market Trading Activity
Observable trades in inactive market for in portfolio securities | 76.46%opy_FairValueInputsObservableTradesInInactiveMarketForInPortfolioSecurities / us-gaap_InvestmentTypeAxis = opy_OtherAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.24%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Duration | 4 years
Current Yield | 0.10%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.69%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Current Yield | 0.48%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.45%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Duration | 4 years
Current Yield | 0.28%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.18%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Duration | 4 years 6 months
Current Yield | 0.21%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities01Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Auction Rate Securities 02 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 91.00%opy_FairValueInputsObservableTradesInInactiveMarketForInPortfolioSecurities / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecurities02Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.91%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Duration | 7 years
Current Yield | 0.79%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Observable trades in inactive market for in portfolio securities | 76.46%opy_FairValueInputsObservableTradesInInactiveMarketForInPortfolioSecurities / us-gaap_InvestmentTypeAxis = opy_OtherAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesOwnedMember
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Duration | 4 years
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.91%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Duration | 7 years
Current Yield | 0.79%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.18%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Duration | 4 years 6 months
Current Yield | 0.21%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.24%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Current Yield | 0.10%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.69%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Current Yield | 0.48%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.45%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Duration | 4 years
Current Yield | 0.28%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.91%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Duration | 7 years
Current Yield | 0.79%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.18%us-gaap_FairValueInputsDiscountRate / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Duration | 4 years 6 months
Current Yield | 0.21%opy_FairValueUnobservableInputCurrentYield / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities [Member] | Fair Value, Valuation Scenario Two [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [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
Auction Rate Securities [Member] | Fair Value, Valuation Scenario One [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [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
Auction Rate Securities Purchase Commitment [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 14,250,000 opy_LevelThreePrincipalAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Adjustment | 797,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Fair Value | 13,453,000 opy_FairValueOfLevelThreeAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 10,116,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Adjustment | 449,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Fair Value | 9,667,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 18,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Adjustment | 2,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Fair Value | 16,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_StudentLoanAuctionRateSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Technique | Discounted Cash Flow
Auction Rate Securities Purchase Commitment [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 4,116,000 opy_LevelThreePrincipalAmount / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Adjustment | 346,000 opy_ValuationAdjustmentForLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Fair Value | 3,770,000 opy_FairValueOfLevelThreeAssets / us-gaap_InvestmentTypeAxis = opy_MunicipalAuctionRateSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Valuation Technique | Discounted Cash Flow

X
- Definition Fair value inputs observable trades in inactive market for in portfolio securities. + References No definition available. + Details
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- Definition Fair value of the level 3 assets used for the quantitative disclosure. + References No definition available. + Details
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- Definition Fair value unobservable input current yield. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Fair value unobservable inputs duration. + References No definition available. + Details
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- Definition Investment redemption notice period maximum. + References No definition available. + Details
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Balance Type: | na
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- Definition Investment redemption notice period minimum. + References No definition available. + Details
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- Definition Amount represents the principal amount of the level 3 assets used for the quantitative disclosure. + References No definition available. + Details
Name: | opy_LevelThreePrincipalAmount
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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