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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