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Contributed Capital - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
Compensation Related Costs [Abstract]
Warrants issued	2008
Warrants expire date	2013-04-13

X

- Definition

Warrant issue date.

+ References

No definition available.

+ Details

Name:	opy_WarrantIssueDate
Namespace Prefix:	opy_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expiration date of warrants issued.

+ References

No definition available.

+ Details

Name:	opy_WarrantsExpirationDate
Namespace Prefix:	opy_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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