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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Parenthetical) (Detail) (Level 3 [Member]) | Dec. 31, 2013
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Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value assumption discount rate range of spread rate on treasury securities | 1.20%
U.S. Treasury rate | 2.45%
Auction Rate Securities [Member] | Municipal Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value assumption discount rate range of spread rate on treasury securities | 175.00%
U.S. Treasury rate | 1.50%
Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
U.S. Treasury rate | 1.25%
Auction Rate Preferred Securities [Member] | Minimum [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value assumption discount rate range of spread rate on treasury securities | 110.00%
Auction Rate Preferred Securities [Member] | Maximum [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value assumption discount rate range of spread rate on treasury securities | 150.00%

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- Definition Fair value assumption discount rate spread rate on treasury securities. + References No definition available. + Details
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- Definition Percentage of treasury security. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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