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Bank Call Loans - Additional Information (Narrative) (Details) - USD ($) number in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Bank Call Loans [Abstract] |  |  |
Broker call rate | 0.00% | 0.00% |
Interest expense on bank call loans | $ 2.6 | $ 1.7 | $ 1.5

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- Definition Bank Call Loans [Abstract] + References No definition available. + Details
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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
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Namespace Prefix: | opy_
Data Type: | num:percentItemType
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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