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Variable Interest Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total VIE Assets	$ 547,920	$ 644,635
Hedge Funds [Member]
Variable Interest Entity [Line Items]
Total VIE Assets	546,555	643,251
Carrying Value of Variable Interest Assets	0	0
Carrying Value of Variable Interest Liabilities	0	0
Capital Commitments	0	0
Maximum Exposure to Loss in Non- consolidated VIEs	0	0
Special Purpose Acquisition Companies
Variable Interest Entity [Line Items]
Total VIE Assets	1,365	1,384
Carrying Value of Variable Interest Assets	0	0
Carrying Value of Variable Interest Liabilities	0	0
Capital Commitments	0	0
Maximum Exposure to Loss in Non- consolidated VIEs	$ 0	$ 0

X

- Definition

The amount of unfunded capital for which the entity is obligated, to those certain investments for which net asset value per share is calculated.

+ References

No definition available.

+ Details

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Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Variable interest entity assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Variable Interest Entity, nonconsolidated, Carrying Amount Asset

+ References

No definition available.

+ Details

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Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Variable Interest Entity, nonconsolidated, Carrying Amount Liability

+ References

No definition available.

+ Details

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Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Difference between the carrying amount of assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the variable interest entity (VIE) and the reporting entity's maximum exposure to loss as a result of its involvement with the VIE, where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- 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_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=opy_SpecialPurposeAcquisitionCompaniesMember
Namespace Prefix:
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Balance Type:
Period Type: