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Employee Compensation Plans - Stock Appreciation Rights (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Number of OARs outstanding 1,840,910opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
Total weighted average strike price $ 22.36opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsWeightedAverageStrikePrice
Total weighted average remaining contractual life 2 years 4 months 24 days
Total weighted average fair value per share $ 5.17opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsWeightedAverageFairValuePerShare
January 12, 2009  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Number of OARs outstanding 235,890opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
/ us-gaap_AwardTypeAxis
= opy_JanuaryTwelveTwoThousandNineMember
Strike price $ 30.68opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice
/ us-gaap_AwardTypeAxis
= opy_JanuaryTwelveTwoThousandNineMember
Remaining contractual life 18 days
Fair value per share $ 0opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare
/ us-gaap_AwardTypeAxis
= opy_JanuaryTwelveTwoThousandNineMember
January 19, 2010  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Number of OARs outstanding 326,480opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
/ us-gaap_AwardTypeAxis
= opy_JanuaryNineteenTwoThousandTenMember
Strike price $ 26.35opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice
/ us-gaap_AwardTypeAxis
= opy_JanuaryNineteenTwoThousandTenMember
Remaining contractual life 1 year
Fair value per share $ 1.63opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare
/ us-gaap_AwardTypeAxis
= opy_JanuaryNineteenTwoThousandTenMember
January 13, 2011  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Number of OARs outstanding 366,650opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
/ us-gaap_AwardTypeAxis
= opy_JanuaryThirteenTwoThousandElevenMember
Strike price $ 18.94opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice
/ us-gaap_AwardTypeAxis
= opy_JanuaryThirteenTwoThousandElevenMember
Remaining contractual life 2 years
Fair value per share $ 5.71opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare
/ us-gaap_AwardTypeAxis
= opy_JanuaryThirteenTwoThousandElevenMember
January 19, 2012  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Number of OARs outstanding 403,340opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
/ us-gaap_AwardTypeAxis
= opy_JanuaryNineteenTwoThousandTwelveMember
Strike price $ 15.94opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice
/ us-gaap_AwardTypeAxis
= opy_JanuaryNineteenTwoThousandTwelveMember
Remaining contractual life 3 years
Fair value per share $ 8.36opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare
/ us-gaap_AwardTypeAxis
= opy_JanuaryNineteenTwoThousandTwelveMember
January Fourteen Two Thousand Thirteen  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Number of OARs outstanding 508,550opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
/ us-gaap_AwardTypeAxis
= opy_JanuaryFourteenTwoThousandThirteenMember
Strike price $ 23.48opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice
/ us-gaap_AwardTypeAxis
= opy_JanuaryFourteenTwoThousandThirteenMember
Remaining contractual life 4 years
Fair value per share $ 6.94opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare
/ us-gaap_AwardTypeAxis
= opy_JanuaryFourteenTwoThousandThirteenMember