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Income Taxes - Additional Information (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Income Taxes [Line Items]        
Profit (loss) before income taxes for foreign operations $ 4,300,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign $ (1,300,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign $ (2,400,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign  
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 18,400,000us-gaap_IncomeTaxReconciliationTaxCreditsInvestment      
Unrecognized deferred tax liability related to earnings of foreign subsidiaries 2,300,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries      
Deferred tax asset arising from New York State Investment Tax Credits and Employment Incentive Credits (13,097,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (7,096,000)us-gaap_DeferredTaxAssetsLiabilitiesNet    
Credits expiration date 2028      
Goodwill amortized period 15 years      
Unrecognized tax benefits 1,583,000us-gaap_UnrecognizedTaxBenefits 1,574,000us-gaap_UnrecognizedTaxBenefits 5,236,000us-gaap_UnrecognizedTaxBenefits 2,317,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefit that would impact tax rate 1,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Reclass to other tax accounts 0opy_UnrecognizedTaxBenefitsReclassToDeferredTaxLiability 4,907,000opy_UnrecognizedTaxBenefitsReclassToDeferredTaxLiability 0opy_UnrecognizedTaxBenefitsReclassToDeferredTaxLiability  
Income tax-related interest (benefit) expense 22,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense (284,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense    
Income tax-related interest payable 83,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 61,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
State and Local Jurisdiction        
Schedule Of Income Taxes [Line Items]        
Deferred tax asset arising from New York State Investment Tax Credits and Employment Incentive Credits 726,000us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
     
State and Local Jurisdiction | New York State | Minimum        
Schedule Of Income Taxes [Line Items]        
Income tax examination year 2008      
State and Local Jurisdiction | New York State | Maximum        
Schedule Of Income Taxes [Line Items]        
Income tax examination year 2011      
State and Local Jurisdiction | New York City | Minimum        
Schedule Of Income Taxes [Line Items]        
Income tax examination year 2009      
State and Local Jurisdiction | New York City | Maximum        
Schedule Of Income Taxes [Line Items]        
Income tax examination year 2012      
Oppenheimer Israel (OPCO) Ltd.        
Schedule Of Income Taxes [Line Items]        
Net operating loss carryforward 1,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= opy_OppenheimerIsraelMember
     
Oppenheimer Investments Asia Ltd.        
Schedule Of Income Taxes [Line Items]        
Net operating loss carryforward 898,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= opy_OppenheimerInvestmentsAsiaMember
     
Oppenheimer Europe Ltd        
Schedule Of Income Taxes [Line Items]        
Net operating loss carryforward $ 191,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ dei_LegalEntityAxis
= opy_OppenheimerEuropeMember