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Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |
Amortization of right-of-use lease assets |  |  | $ 19,514 | $ 18,747
Real Estate [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Amortization of right-of-use lease assets | $ 6,053 | $ 5,862 | 18,171 | 17,326
Operating Lease, Interest Expense | 3,523 | 3,720 | 10,726 | 11,475
Equipment [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Amortization of right-of-use lease assets | 453 | 473 | 1,343 | 1,421
Operating Lease, Interest Expense | $ 34 | $ 48 | $ 110 | $ 153

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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
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- Definition Operating Lease Right-of-use Asset, Amortization + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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

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