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Variable Interest Entities ("VIEs") - Variable Interest Entities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]    
Total VIE Assets $ 1,947,862opy_VariableInterestEntityAssets [1] $ 2,021,915opy_VariableInterestEntityAssets [1]
Carrying Value of Variable Interest Assets 1,341us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets [2] 1,611us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets [2]
Capital Commitments 2opy_CapitalCommitments 2opy_CapitalCommitments
Maximum Exposure to Loss in Non- consolidated VIEs 1,343us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure 1,613us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure
Hedge Funds [Member]    
Variable Interest Entity [Line Items]    
Total VIE Assets 1,872,462opy_VariableInterestEntityAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember		 [1] 1,955,515opy_VariableInterestEntityAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember		 [1]
Carrying Value of Variable Interest Assets 1,314us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember		 [2] 1,584us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember		 [2]
Maximum Exposure to Loss in Non- consolidated VIEs 1,314us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember		 1,584us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember
Private Equity Funds [Member]    
Variable Interest Entity [Line Items]    
Total VIE Assets 75,400opy_VariableInterestEntityAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember		 [1] 66,400opy_VariableInterestEntityAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember		 [1]
Carrying Value of Variable Interest Assets 27us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember		 [2] 27us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember		 [2]
Capital Commitments 2opy_CapitalCommitments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember		 2opy_CapitalCommitments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember
Maximum Exposure to Loss in Non- consolidated VIEs $ 29us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember		 $ 29us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember
[1] Represents the total assets of the VIEs and does not represent the Company’s interests in the VIEs.
[2] Represents the Company’s interests in the VIEs and is included in other assets on the condensed consolidated balance sheet.