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Leases Operating lease costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease Right-of-use Asset, Amortization | $ 25,186 | $ 0 | $ 0
Real Estate [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease Right-of-use Asset, Amortization | 23,308 |  |
Operating Lease, Interest Expense | 15,815 |  |
Equipment [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease Right-of-use Asset, Amortization | 1,878 |  |
Operating Lease, Interest Expense | $ 227 |  |

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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: |