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Organization - Additional Information (Details)	Dec. 31, 2015 jurisdiction office state
Organization And Basis Of Presentation [Line Items]
Number of foreign jurisdiction | jurisdiction	6
Americas
Organization And Basis Of Presentation [Line Items]
Number of offices providing services | office	85
Number of states which operates | state	24

X

- Definition

Organization and basis of presentation.

+ References

No definition available.

+ Details

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Namespace Prefix:	opy_
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X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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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
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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
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X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: