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Organization (Details)	Jun. 30, 2025 office state
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	88

X

- Definition

Organization and basis of presentation.

+ References

No definition available.

+ Details

Name:	opy_OrganizationAndBasisOfPresentationLineItems
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

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
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

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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