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Fair Value Measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 623,523 us-gaap_DerivativeAssetNotionalAmount | $ 440,884 us-gaap_DerivativeAssetNotionalAmount
Derivatives asset, Fair Value | 16,782 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 12,111 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Derivative liability, notional | 3,212,139 us-gaap_DerivativeLiabilityNotionalAmount | 5,011,304 us-gaap_DerivativeLiabilityNotionalAmount
Derivative liability, Fair Value | 2,025 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | 3,505 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 238,734 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 147,521 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember
Derivatives asset, Fair Value | 11,424 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 7,576 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember
Derivative liability, notional | 13,345 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 22,269 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember
Derivative liability, Fair Value | 544 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | 1,222 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember
Other Contracts [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 1,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_ForeignExchangeForwardMember | 400,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_ForeignExchangeForwardMember
Other Contracts [Member] | To Be Announced Security [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 44,295 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember | 105,185 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember
Derivatives asset, Fair Value | 230 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember | 1,026 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember
Derivative liability, notional | 38,345 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember | 105,186 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember
Derivative liability, Fair Value | 199 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember | 1,018 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ToBeAnnouncedSecurityMember
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional |  | 636,000 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ForwardStartRepurchaseAgreementMember
Derivative liability, Fair Value |  | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_ForwardStartRepurchaseAgreementMember
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 340,494 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | 188,178 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember
Derivatives asset, Fair Value | 5,128 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember | 3,509 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_TbaSaleAgreementsMember
Other Contracts [Member] | Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, Fair Value | 3 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeForwardMember | 10 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignExchangeForwardMember
Other Contracts [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 14,249 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 12,249 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Derivative liability, Fair Value | 797 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | 902 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember
Commodity Contracts [Member] | Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 3,145,200 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_FutureMember | 3,835,600 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_FutureMember
Derivative liability, Fair Value | $ 482 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_FutureMember | $ 353 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_FinancialInstrumentAxis = us-gaap_FutureMember

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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 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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=56946850&loc=SL5580258-113959 + Details
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- Definition Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 3: 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=51825145&loc=SL20226006-175313 Reference 4: 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=56946850&loc=d3e41678-113959 + Details
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- Definition Fair value, after offset of derivative asset, 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 and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 3: 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=51825145&loc=SL20226006-175313 Reference 4: 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=56946850&loc=d3e41678-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: 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=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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=56946850&loc=SL5580258-113959 + Details
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