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Variable Interest Entities ("VIEs") - Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | $ 1,947,862 opy_VariableInterestEntityAssets | [1] | $ 2,021,915 opy_VariableInterestEntityAssets | [1]
Carrying Value of Variable Interest Assets | 1,341 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets | [2] | 1,611 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets | [2]
Capital Commitments | 2 opy_CapitalCommitments |  | 2 opy_CapitalCommitments |
Maximum Exposure to Loss in Non- consolidated VIEs | 1,343 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure |  | 1,613 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure |
Hedge Funds [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | 1,872,462 opy_VariableInterestEntityAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember | [1] | 1,955,515 opy_VariableInterestEntityAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember | [1]
Carrying Value of Variable Interest Assets | 1,314 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember | [2] | 1,584 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember | [2]
Maximum Exposure to Loss in Non- consolidated VIEs | 1,314 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember |  | 1,584 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMember |
Private Equity Funds [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total VIE Assets | 75,400 opy_VariableInterestEntityAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember | [1] | 66,400 opy_VariableInterestEntityAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember | [1]
Carrying Value of Variable Interest Assets | 27 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember | [2] | 27 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember | [2]
Capital Commitments | 2 opy_CapitalCommitments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember |  | 2 opy_CapitalCommitments / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember |
Maximum Exposure to Loss in Non- consolidated VIEs | $ 29 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember |  | $ 29 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember |
[1] | Represents the total assets of the VIEs and does not represent the Company’s interests in the VIEs.
[2] | Represents the Company’s interests in the VIEs and is included in other assets on the condensed consolidated balance sheet.

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- Definition The amount of unfunded capital for which the entity is obligated, to those certain investments for which net asset value per share is calculated. + References No definition available. + Details
Name: | opy_CapitalCommitments
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable interest entity assets. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Difference between the carrying amount of assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the variable interest entity (VIE) and the reporting entity's maximum exposure to loss as a result of its involvement with the VIE, where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5728-111685 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5728-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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