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Commitments and Contingencies - Additional Information (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 27, 2017 | Feb. 27, 2015 | Jan. 27, 2015 | Jun. 30, 2014 | Feb. 09, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Operating leases expiring at various dates through | 2028 |  |  |  |  |  |  |
Rent expense | $ 45,600,000 us-gaap_LeaseAndRentalExpense | $ 46,400,000 us-gaap_LeaseAndRentalExpense | $ 51,200,000 us-gaap_LeaseAndRentalExpense |  |  |  |  |
Capital Commitments Relating To Investments | 5,100,000 opy_CapitalCommitmentsRelatingToInvestments |  |  |  |  |  |  |
Minimum estimated range of aggregate loss for legal proceedings | 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum |  |  |  |  |  |  |
Maximum estimated range of aggregate loss for legal proceedings | 31,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |  |  |
Purchase Commitments Outstanding, Auction Rate Securities Related to Settlements with Regulators | 825,000 opy_PurchaseCommitmentsOutstandingAuctionRateSecuritiesRelatedtoSettlementswithRegulators |  |  |  |  |  |  |
Eligible investor subject to future buyback principal value | 101,400,000 opy_EligibleInvestorSubjectToFutureBuybackPrincipalValue |  |  |  |  |  |  |
Eligible investor subject to future buyback potential additional losses related to valuation adjustments | 0 opy_EligibleInvestorSubjectToFutureBuybackPotentialAdditionalLossesRelatedToValuationAdjustments |  |  |  |  |  |  |
Period of auction rates security to be purchased from rendering of the award | 30 days |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total amount of ARS the firm purchased and hold | 98,600,000 opy_AmountOfAuctionRateSecuritiesFirmPurchasedAndHold / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |  |  |  |  |  |
Amount of ARS committed to purchase from clients | 12,200,000 opy_AuctionRateSecuritiesCommittedToPurchaseFromClient / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  |  |  |  |  |  |
SEC | Subsequent Events | Unfavorable Regulatory Action |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  | 10,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = opy_SECMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Payments for Legal Settlements |  |  |  | 5,000,000 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = opy_SECMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 5,000,000 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = opy_SECMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
SEC | Subsequent Events | Unfavorable Regulatory Action, Disgorgement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  | 4,200,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = opy_SECMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = opy_UnfavorableRegulatoryActionDisgorgementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
SEC | Subsequent Events | Unfavorable Regulatory Action, Prejudgment Interest |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  | 753,500 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = opy_SECMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = opy_UnfavorableRegulatoryActionPrejudgmentInterestMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
SEC | Subsequent Events | Unfavorable Regulatory Action, Civil Penalties |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  | 5,100,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = opy_SECMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = opy_UnfavorableRegulatoryActionCivilPenaltiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
United States Department of the Treasury | Unfavorable Regulatory Action |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  |  |  | 20,000,000 us-gaap_LitigationSettlementExpense / us-gaap_LitigationCaseAxis = opy_UnitedStatesDepartmentoftheTreasuryMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember |
United States Department of the Treasury | Subsequent Events | Unfavorable Regulatory Action |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  | 10,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = opy_UnitedStatesDepartmentoftheTreasuryMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Payments for Legal Settlements |  |  |  |  | $ 5,000,000 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = opy_UnitedStatesDepartmentoftheTreasuryMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  | $ 5,000,000 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = opy_UnitedStatesDepartmentoftheTreasuryMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition The total amount of ARS the firm purchased and hold. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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