XML 81 R71.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Condensed Consolidating Financial Information - Narrative (Details) | 6 Months Ended
--- | ---
Jun. 30, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Interest owned by the holding company | 100.00%

X
- Definition The percentage of ownership the holding company owns the guarantors. + References No definition available. + Details
Name: | opy_InterestOwnershipByHoldingCompany
Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration