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Bank Call Loans - Additional Information (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Bank Call Loans [Abstract] |  |  |
Broker call rate | 2.00%opy_BrokerCallRate | 2.00%opy_BrokerCallRate |
Interest expense on bank call loans | $ 1,400,000 opy_InterestExpenseOnBankCallLoans | $ 2,200,000 opy_InterestExpenseOnBankCallLoans | $ 996,200 opy_InterestExpenseOnBankCallLoans

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- Details
Name: | opy_BankCallLoansAbstract
Namespace Prefix: | opy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Broker call rate as of the balance sheet date. + References No definition available. + Details
Name: | opy_BrokerCallRate
Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest expense on bank call loans. + References No definition available. + Details
Name: | opy_InterestExpenseOnBankCallLoans
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration