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Employee Compensation Plans - Additional Information (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
employee_compensation_plan
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 29, 2015
Jan. 09, 2015
Jan. 28, 2019
Feb. 26, 2015
Jan. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of Employee Compensation Plans Granted 2opy_NumberofEmployeeCompensationPlansGranted                  
Term granted for options 5 years [1] 5 years [1] 5 years [1] 5 years [1] 4 years 6 months [1]          
Maximum annual contribution under Defined Contribution Plan $ 17,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount $ 17,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount $ 17,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount              
Employer contribution to Defined Contribution Plan 1,200,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,300,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,100,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount              
Deferred bonus amounts 8,600,000opy_DeferredCompensationArrangementAmountOfBonusAwarded 8,500,000opy_DeferredCompensationArrangementAmountOfBonusAwarded 8,100,000opy_DeferredCompensationArrangementAmountOfBonusAwarded              
Vesting period of deferred bonus 5 years                  
Company-owned life insurance policy designed to offset a percentage of the EDCP liability 60.00%opy_CompanyOwnedLifeInsurance                  
Deferred compensation plans cost 11,400,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 17,800,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 12,100,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense              
Number of Options, Granted 2,976us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 951us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross                
Restricted Stock | Class A Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Aggregate intrinsic value of ESP awards outstanding 28,800,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                  
The aggregate intrinsic value of ESP awards that are expected to vest 27,900,000opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                  
Compensation expense relating to the share-based awards 5,600,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 5,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 3,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		              
Unrecognized compensation cost related to unvested share-based compensation 9,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                  
Cost is expected to be recognized over a weighted average period 1 year 8 months 12 days                  
Number of shares of Class A Stock available 998,615us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                  
Employee Stock Option                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expense relating to the share-based awards 133,600us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 158,200us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 164,200us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		              
Cost is expected to be recognized over a weighted average period 1 year 2 months 23 days                  
Aggregate intrinsic value of options outstanding 12,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                  
Aggregate intrinsic value of vested options 1,600opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                  
Aggregate intrinsic value of options that are expected to vest 11,400opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                  
Unrecognized compensation cost related to unvested share-based compensation 74,300us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                  
Employee Stock Option | Subsequent Events                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment           4 years 6 months        
Number of Options, Granted           4,177us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Stock Appreciation Rights                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expense relating to the share-based awards 380,100us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember		 4,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember		 590,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember		              
Cost is expected to be recognized over a weighted average period 2 years 4 months 24 days                  
Aggregate intrinsic value of OARs outstanding and expected to vest 4,500,000opy_StockAppreciationRightsOutstandingAndExpectedToVestAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember		                  
Liability related to the OARs 3,400,000opy_LiabilityRelatedToOppenheimerStockAppreciationRights
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember		                  
Total unrecognized compensation cost 5,300,000opy_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedStockAppreciationRights
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember		                  
Stock Appreciation Rights | Subsequent Events                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment             5 years      
Number of OARs             567,600opy_NumberOfStockAppreciationRightsGranted
/ us-gaap_AwardTypeAxis
= opy_StockAppreciationRightsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Employee Share Plan | Minimum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment 3 years                  
Employee Share Plan | Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment 5 years                  
Oppenheimer Holdings Inc. Stock Appreciation Right Plan | Stock Appreciation Rights                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment 5 years                  
Equity Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Term granted for options 5 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 6 months                  
Equity Incentive Plan | Vesting Period Five Years | Class A Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Term granted for options 5 years                  
Equity Incentive Plan | Second Anniversary                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting percentage under share based payment 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= opy_EquityIncentivePlanMember
/ us-gaap_VestingAxis
= opy_SecondAnniversaryMember		                  
Equity Incentive Plan | Third Anniversary                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting percentage under share based payment 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= opy_EquityIncentivePlanMember
/ us-gaap_VestingAxis
= opy_ThirdAnniversaryMember		                  
Equity Incentive Plan | Fourth Anniversary                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting percentage under share based payment 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= opy_EquityIncentivePlanMember
/ us-gaap_VestingAxis
= opy_FourthAnniversaryMember		                  
Equity Incentive Plan | Six Months Before Expiration                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting percentage under share based payment 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= opy_EquityIncentivePlanMember
/ us-gaap_VestingAxis
= opy_ExpirationDateOneMember		                  
Stock Incentive Plan 2014 | Subsequent Events | Class A Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares awarded           133,681us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     138,900us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Shares vesting period               Jan. 28, 2018    
Stock Incentive Plan 2014 | Subsequent Events | Class A Stock | Non Employee Director                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares awarded                   14,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= opy_NonEmployeeDirectorMember
Next three years vesting percentage of shares                   25.00%opy_PercentageOfRestrictedStockVestingInNextThreeYearsFromDateOfGrant
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= opy_NonEmployeeDirectorMember
Stock Incentive Plan 2014 | Restricted Stock | Subsequent Events | Class A Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment           3 years     5 years  
Number of shares awarded           31,690us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     13,795us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Stock Incentive Plan 2014 | Vesting Period Three Years | Subsequent Events | Class A Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment           3 years     3 years  
Number of shares awarded           59,876us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= opy_VestingPeriodThreeYearsMember
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Stock Incentive Plan 2014 | Vesting Period Five Years | Subsequent Events | Class A Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under share based payment           5 years     5 years  
Number of shares awarded           73,805us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= opy_VestingPeriodFiveYearsMember
/ us-gaap_PlanNameAxis
= opy_StockIncentivePlanTwoThousandFourteenMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Executive Deferred Compensation Plan and Deferred Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Company's deferred compensation liability 49,600,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_PlanNameAxis
= opy_ExecutiveDeferredCompensationPlanAndDeferredIncentivePlanMember		                  
CIBC Deferred Compensation Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Company's deferred compensation liability $ 16,000,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_PlanNameAxis
= opy_DeferredCompensationPlanMember		                  
[1] The expected term was determined based on actual awards.