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Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Real Estate [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating Lease Right-of-use Asset, Amortization | $ 5,696 | $ 17,740
Operating Lease, Interest Expense | 4,145 | 11,792
Equipment [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating Lease Right-of-use Asset, Amortization | 462 | 1,401
Operating Lease, Interest Expense | $ 57 | $ 171

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- Definition Operating Lease, Interest Expense + References No definition available. + Details
Name: | opy_OperatingLeaseInterestExpense
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Lease Right-of-use Asset, Amortization + References No definition available. + Details
Name: | opy_OperatingLeaseRightofuseAssetAmortization
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |