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Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Lessee, Lease, Description [Line Items] |  |
Leases - Right-of-use lease asset amortization | $ 6,478 | $ 6,843
Real Estate |  |
Lessee, Lease, Description [Line Items] |  |
Leases - Right-of-use lease asset amortization | 6,046 | 6,439
Leases - Interest expense | 3,323 | 3,209
Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Leases - Right-of-use lease asset amortization | 431 | 422
Leases - Interest expense | $ 46 | $ 46

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- Definition Operating Lease, Interest Expense + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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