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Collateralized Transactions - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Reverse repurchase agreements |  |  |  |
Gross Amounts of Recognized Assets | $ 314,266 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross |  | $ 389,439 us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross |
Gross Amounts Offset in the Statement of Financial Position | (62,660)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability |  | (204,614)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability |
Net Amounts of Assets Presented on the Balance Sheet | 251,606 opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral |  | 184,825 opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral |
Financial Instruments | (250,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities |  | (183,305)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities |
Cash Collateral Received | 0 us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash |  | 0 us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash |
Net Amount | 1,606 opy_SecuritiesPurchasedunderAgreementstoResellOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |  | 1,520 opy_SecuritiesPurchasedunderAgreementstoResellOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |
Securities borrowed |  |  |  |
Gross Amounts of Recognized Assets | 242,172 us-gaap_SecuritiesBorrowedGross | [1] | 274,127 us-gaap_SecuritiesBorrowedGross | [1]
Gross Amounts Offset in the Statement of Financial Position | 0 us-gaap_SecuritiesBorrowedLiability | [1] | 0 us-gaap_SecuritiesBorrowedLiability | [1]
Net Amounts of Assets Presented on the Balance Sheet | 242,172 opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral | [1] | 274,127 opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral | [1]
Financial Instruments | (234,376)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities | [1] | (265,936)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities | [1]
Cash Collateral Received | 0 us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash | [1] | 0 us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash | [1]
Net Amount | 7,796 opy_SecuritiesBorrowedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection | [1] | 8,191 opy_SecuritiesBorrowedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection | [1]
Total |  |  |  |
Gross Amounts of Recognized Assets | 556,438 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross |  | 663,566 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross |
Gross Amounts Offset in the Statement of Financial Position | (62,660)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability |  | (204,614)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability |
Net Amounts of Assets Presented on the Balance Sheet | 493,778 opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral |  | 458,952 opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral |
Financial Instruments | (484,376)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities |  | (449,241)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities |
Cash Collateral Received | 0 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash |  | 0 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash |
Net Amount | 9,402 opy_DerivativeAssetSecuritiesPurchasedunderAgreementstoResellSecuritiesBorrowedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |  | 9,711 opy_DerivativeAssetSecuritiesPurchasedunderAgreementstoResellSecuritiesBorrowedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |
Repurchase agreements |  |  |  |
Gross Amounts of Recognized Liabilities | 750,100 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |  | 962,105 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |
Gross Amounts Offset in the Statement of Financial Position | (62,660)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset |  | (204,614)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset |
Net Amounts of Liabilities Presented on the Balance Sheet | 687,440 opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral |  | 757,491 opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral |
Financial Instruments | (686,119)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities |  | (753,003)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities |
Cash Collateral Pledged | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash |  | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash |
Net Amount | 1,321 opy_SecuritiesSoldunderAgreementstoRepurchaseOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |  | 4,488 opy_SecuritiesSoldunderAgreementstoRepurchaseOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |
Securities loaned |  |  |  |
Gross Amounts of Recognized Liabilities | 137,892 us-gaap_SecuritiesLoanedGross | [2] | 211,621 us-gaap_SecuritiesLoanedGross | [2]
Gross Amounts Offset in the Statement of Financial Position | 0 us-gaap_SecuritiesLoanedAsset | [2] | 0 us-gaap_SecuritiesLoanedAsset | [2]
Net Amounts of Liabilities Presented on the Balance Sheet | 137,892 opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral | [2] | 211,621 opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral | [2]
Financial Instruments | (132,258)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities | [2] | (204,971)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities | [2]
Cash Collateral Pledged | 0 us-gaap_SecuritiesLoanedCollateralRightToReclaimCash | [2] | 0 us-gaap_SecuritiesLoanedCollateralRightToReclaimCash | [2]
Net Amount | 5,634 opy_SecuritiesLoanedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection | [2] | 6,650 opy_SecuritiesLoanedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection | [2]
Total |  |  |  |
Gross Amounts of Recognized Liabilities | 887,992 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross |  | 1,173,726 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross |
Gross Amounts Offset in the Statement of Financial Position | (62,660)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset |  | (204,614)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset |
Net Amounts of Liabilities Presented on the Balance Sheet | 825,332 opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral |  | 969,112 opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral |
Financial Instruments | (818,377)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities |  | (957,974)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities |
Cash Collateral Pledged | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash |  | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash |
Net Amount | $ 6,955 opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |  | $ 11,138 opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElection |
[1] | Included in receivable from brokers, dealers and clearing organizations on the consolidated balance sheet.
[2] | Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.

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