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Financial Instruments - Notional and Fair Values of TBAs (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value Of To Be Announced Securities [Abstract] |  |
Notional Amount, Sale of TBAs | $ 381,124 | $ 449,065
Notional Amount, Purchase of TBAs | 42,709 | 117,573
Notional Amount, Funding Commitments | 266,273 | 304,390
Notional Amount, Total | 308,982 | 421,963
Fair Value, Sale of TBAs | 3,403 | 3,188
Fair Value, Purchase of TBAs | 536 | 175
Fair Value, Funding Commitments |  |
Fair Value, Total |  |

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- Definition Fair value funding commitments. + References No definition available. + Details
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- Definition Fair value of securities. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Definition Fair value purchases of to be announced securities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Fair value sale of to be announced securities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Notional amount. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Notional amount funding commitments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notional amount purchase of to be announced securities. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Notional amount sale of to be announced securities. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant