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v3.24.1.u1

Organization (Details) | Mar. 31, 2024 office state
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Organization And Basis Of Presentation [Line Items] |
Number of states in which entity operates | state | 25
UNITED STATES |
Organization And Basis Of Presentation [Line Items] |
Number of offices providing services | office | 89

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- Definition Organization and basis of presentation. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of stores. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |