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Income Taxes - Additional Information (Narrative) (Details) (USD $) | 12 Months Ended |
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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 | $ 4,300,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | $ (1,300,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | $ (2,400,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 18,400,000 us-gaap_IncomeTaxReconciliationTaxCreditsInvestment |  |  |
Unrecognized deferred tax liability related to earnings of foreign subsidiaries | 2,300,000 us-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 | 1,583,000 us-gaap_UnrecognizedTaxBenefits | 1,574,000 us-gaap_UnrecognizedTaxBenefits | 5,236,000 us-gaap_UnrecognizedTaxBenefits | 2,317,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefit that would impact tax rate | 1,300,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 1,300,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Reclass to other tax accounts | 0 opy_UnrecognizedTaxBenefitsReclassToDeferredTaxLiability | 4,907,000 opy_UnrecognizedTaxBenefitsReclassToDeferredTaxLiability | 0 opy_UnrecognizedTaxBenefitsReclassToDeferredTaxLiability |
Income tax-related interest (benefit) expense | 22,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (284,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense |  |
Income tax-related interest payable | 83,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 61,000 us-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 | 726,000 us-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 | 1,700,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = opy_OppenheimerIsraelMember |  |  |
Oppenheimer Investments Asia Ltd. |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 898,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = opy_OppenheimerInvestmentsAsiaMember |  |  |
Oppenheimer Europe Ltd |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 191,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = opy_OppenheimerEuropeMember |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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