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Variable Interest Entities (Details) - Hedge Funds [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | $ 643,251 | $ 390,063
Capital Commitments |  | 0 | 0
Variable Interest Entity Nonconsolidated Carrying Amount Assets | [1] |  | 259
Maximum Exposure to Loss in Non- consolidated VIEs |  | $ 0 | $ 259
[1] | (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 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
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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
Name: | opy_VariableInterestEntityAssets
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable Interest Entity Nonconsolidated Carrying Amount of 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121559654&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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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