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Employee Compensation Plans - Summarizes of Company's Non-Vested Options (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Options, Non-vested beginning of year | 76,914
Number of Options, Granted | 1,590
Number of Options, Vested | (27,724)
Number of Options, Forfeited or expired |
Number of Options, Non-vested end of year | 50,780
Weighted average fair value, Non-vested beginning of year | $ 8.88
Weighted average fair value, Granted | $ 7.67
Weighted average fair value, Vested | $ 9.03
Weighted average fair value, Forfeited or expired |
Weighted average fair value, Non-vested end of year | $ 9.49

X
- Definition The number of equity-based payment instruments, options, that were forfeited or expired during the reporting period. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsForfeitedOrExpiredInPeriod
Namespace Prefix: | opy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on stock option plans. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantsInPeriod
Namespace Prefix: | opy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on option plans. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | opy_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average fair value as of the grant date of option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedOrExpiredWeightedAverageGrantDateFairValue
Namespace Prefix: | opy_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of non-vested options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber
Namespace Prefix: | opy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average fair value of nonvested awards on option plans. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | opy_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, options, that vested during the reporting period. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod
Namespace Prefix: | opy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value as of grant date pertaining to an option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
Name: | opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration