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Bank Call Loans - Summary of Bank Call Loans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Bank Call Loans [Abstract] |  |
Year-end balance | $ 59,400 us-gaap_BankLoans | $ 118,200 us-gaap_BankLoans
Weighted interest rate (at end of year) | 1.22%opy_WeightedAverageInterestRate | 1.28%opy_WeightedAverageInterestRate
Maximum balance (at any month-end) | 197,000 opy_BankLoansMaximumBalanceAtAnyMonthEnd | 266,300 opy_BankLoansMaximumBalanceAtAnyMonthEnd
Average amount outstanding (during the year) | $ 108,235 opy_BankCallLoansAverageAmountOutstandingDuringYear | $ 164,434 opy_BankCallLoansAverageAmountOutstandingDuringYear
Average interest rate (during the year) | 1.26%opy_AverageInterestRates | 1.25%opy_AverageInterestRates

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- Definition Average interest rates. + References No definition available. + Details
Name: | opy_AverageInterestRates
Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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 Bank call loans average amount outstanding during year. + References No definition available. + Details
Name: | opy_BankCallLoansAverageAmountOutstandingDuringYear
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Bank loans maximum balance at any month end. + References No definition available. + Details
Name: | opy_BankLoansMaximumBalanceAtAnyMonthEnd
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Weighted average interest rate. + References No definition available. + Details
Name: | opy_WeightedAverageInterestRate
Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amounts due on short-term bank loans secured by customers' securities on the balance sheet date. + References No definition available. + Details
Name: | us-gaap_BankLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant