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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |  |  |
Derivatives asset, Notional | $ 440,884 us-gaap_DerivativeAssetNotionalAmount | [1] | $ 407,246 us-gaap_DerivativeAssetNotionalAmount | [1]
Derivatives asset, Fair Value | 12,111 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | [1] | 4,530 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | [1]
Derivative liability, notional | 5,011,304 us-gaap_DerivativeLiabilityNotionalAmount | [1] | 7,188,207 us-gaap_DerivativeLiabilityNotionalAmount | [1]
Derivative liability, Fair Value | 3,505 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | [1] | 6,574 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | [1]
Other Contracts | TBA |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivatives asset, Notional | 105,185 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1] | 25,262 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1]
Derivatives asset, Fair Value | 1,026 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1] | 134 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1]
Derivative liability, notional | 105,186 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1] | 14,547 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1]
Derivative liability, Fair Value | 1,018 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1] | 73 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaMember | [1]
Other Contracts | TBA Sale Agreements |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivatives asset, Notional | 188,178 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | [1] | 266,415 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | [1]
Derivatives asset, Fair Value | 3,509 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | [1] | 2,021 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | [1]
Other Contracts | Foreign currency forward contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 400,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeForwardMember | [1] |  |
Derivative liability, Fair Value | 10 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeForwardMember | [1] |  |
Other Contracts | Forward Start Repurchase Agreement |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 636,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ForwardStartRepurchaseAgreementMember | [1] | 506,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ForwardStartRepurchaseAgreementMember | [1]
Derivative liability, Fair Value | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ForwardStartRepurchaseAgreementMember | [1] | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ForwardStartRepurchaseAgreementMember | [1]
Other Contracts | Auction Rate Securities Purchase Commitment |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 12,249 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [1] | 29,056 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [1]
Derivative liability, Fair Value | 902 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [1] | 2,600 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [1]
Other Contracts | Interest rate lock commitments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivatives asset, Notional | 147,521 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 115,569 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivatives asset, Fair Value | 7,576 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 2,375 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative liability, notional | 22,269 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 76,604 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Derivative liability, Fair Value | 1,222 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 3,653 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Commodity Contracts | U.S. treasury futures |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 102,600 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_UsTreasuryFuturesMember | [1],[2] | 60,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_UsTreasuryFuturesMember | [1],[3]
Derivative liability, Fair Value | 252 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_UsTreasuryFuturesMember | [1],[2] | 186 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_UsTreasuryFuturesMember | [1],[3]
Commodity Contracts | Federal funds futures |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 3,260,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_FederalFundsFuturesMember | [1],[2] | 6,155,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_FederalFundsFuturesMember | [1],[3]
Derivative liability, Fair Value | 43 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_FederalFundsFuturesMember | [1],[2] | 18 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_FederalFundsFuturesMember | [1],[3]
Commodity Contracts | Euro Dollars Futures |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 333,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_EuroDollarsFuturesMember | [1],[2] | 347,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_EuroDollarsFuturesMember | [1],[3]
Derivative liability, Fair Value | 55 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_EuroDollarsFuturesMember | [1],[2] | 44 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_EuroDollarsFuturesMember | [1],[3]
Commodity Contracts | General collateral futures |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 140,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_GeneralcollateralfuturesMember | [1],[2] |  |
Derivative liability, Fair Value | $ 3 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_GeneralcollateralfuturesMember | [1],[2] |  |
[1] | See “Derivative Instruments and Hedging Activities” above for description of derivative financial instruments. Such derivative instruments are not subject to master netting agreements, thus the related amounts are not offset.
[2] | Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.
[3] | For the year ended December 31, 2014, the diluted earnings per share computation does not include the anti-dilutive effect of 43,008 shares of Class A Stock granted under share-based compensation arrangements (57,573 and 1,936,871 shares of Class A Stock granted under share-based compensation arrangements together with the warrant described in (1) for the years ended December 31, 2013 and 2012, respectively).

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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