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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Interest rate lock commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Beginning Balance | $ 2,375 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [1],[2] | $ 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |
Total Realized and Unrealized Gains (Losses), Assets | 5,201 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [2],[3],[4] | 2,375 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [3],[5]
Purchases and Issuances | 0 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [2],[6] |  |
Sales and Settlements | 0 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [2] |  |
Transfers In (Out) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [2] |  |
Assets Ending Balance | 7,576 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [2] | 2,375 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [1],[2]
Liabilities Beginning Balance | 3,653 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |
Total Realized and Unrealized Gains (Loss), Liabilities | 2,431 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember | [3],[5] | (3,653)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |
Liabilities Ending Balance | 1,222 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |  | 3,653 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember |
Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Beginning Balance | 5,946 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1],[7] | 12,954 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1]
Total Realized and Unrealized Gains (Losses), Assets | 101 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [3],[4],[7] | 929 opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1],[3],[5]
Purchases and Issuances | 5,178 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [6],[7] | 1,414 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1],[4]
Sales and Settlements | (1,097)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [7] | (8,898)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1]
Transfers In (Out) | (620)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [7] | (453)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1]
Assets Ending Balance | 9,508 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [7] | 5,946 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentsMember | [1],[7]
Auction rate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Beginning Balance | 85,124 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [6],[8],[9] | 72,118 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [6],[8]
Total Realized and Unrealized Gains (Losses), Assets | (622)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [3],[4],[8],[9] | (1,409)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [3],[5],[6],[8]
Purchases and Issuances | 20,625 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [6],[8],[9] | 21,875 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [4],[6],[8]
Sales and Settlements | (13,705)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [8],[9] | (7,460)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [6],[8]
Transfers In (Out) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [8],[9] |  |
Assets Ending Balance | 91,422 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [8],[9] | 85,124 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [6],[8],[9]
Liabilities Beginning Balance |  |  | 100 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | [8]
Purchases and Issuances |  |  | 100 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesIssuances / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |
Auction Rate Securities Purchase Commitment |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities Beginning Balance | 2,600 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [5],[7] | 2,647 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [7]
Total Realized and Unrealized Gains (Loss), Liabilities | 1,698 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [3],[5],[7] | 47 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [3],[5],[7]
Liabilities Ending Balance | 902 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [5] | 2,600 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = opy_AuctionRateSecuritiesPurchaseCommitmentMember | [5],[7]
Municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Beginning Balance | 236 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  | 239 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |
Total Realized and Unrealized Gains (Losses), Assets | (72)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | [3],[4] | (3)opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | [3],[5]
Purchases and Issuances | 0 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | [6] |  |
Sales and Settlements | 0 opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  |  |
Transfers In (Out) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  |  |
Assets Ending Balance | 164 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |  | 236 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember |
Mortgage and other asset-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets Beginning Balance |  |  | 40 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | [10]
Sales and Settlements |  |  | (8)opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | [10]
Transfers In (Out) |  |  | $ (32)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember | [10]
[1] | Interest rate lock commitment assets and liabilities are recorded upon the commitment to originate a loan with a borrower and sell the loan to an investor. The commitment assets and liabilities are recognized at fair value, which reflects the fair value of the contractual loan origination related fees and sale premiums, net of co-broker fees, and the estimated fair value of the expected net future cash flows associated with the servicing of the loan.
[2] | Interest rate lock commitment assets and liabilities are recorded upon the commitment to originate a loan with a borrower and sell the loan to an investor. The commitment assets and liabilities are recognized at fair value, which reflects the fair value of the contractual loan origination related fees and sale premiums, net of co-broker fees, and the estimated fair value of the expected net future cash flows associated with the servicing of the loan
[3] | Included in principal transactions on the consolidated statement of operations, except for investments which are included in other income on the consolidated statement of operations.
[4] | Unrealized gains (losses) are attributable to assets or liabilities that are still held at the reporting date.
[5] | Represents the difference in principal and fair value for auction rate securities purchase commitments outstanding at the end of the year.
[6] | Purchases and issuances in connection with ARS purchase commitments represent instances in which the Company purchased ARS securities from clients during the period pursuant to regulatory and legal settlements and awards that satisfy the outstanding commitment to purchase obligation. This also includes instances where the ARS issuer has redeemed ARS where the Company had an outstanding purchase commitment prior to the Company purchasing those ARS.
[7] | Primarily represents general partner ownership and limited partner interests in hedge funds and private equity funds sponsored by the Company.
[8] | Represents auction rate preferred securities, municipal auction rate securities and student loan auction rate securities that failed in the auction rate market.
[9] | Sales and settlements for the ARS purchase commitments represent additional purchase commitments made during the year for regulatory and legal ARS settlements and awards.
[10] | Represents private placements of non-agency collateralized mortgage obligations.

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- Definition Fair value assets measured on recurring basis change in realized and unrealized gain (loss) included in other income. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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