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Long-term debt - Additional Information (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 Senior Secured Credit Note [Member] | Dec. 31, 2010 Senior Secured Credit Note [Member] | Apr. 12, 2011 Senior Secured Credit Note [Member] | Apr. 12, 2011 Subordinated Note [Member] | Dec. 31, 2011 Subordinated Note [Member] | Dec. 31, 2010 Subordinated Note [Member] | Dec. 31, 2012 Senior Secured Notes [Member] | Dec. 31, 2011 Senior Secured Notes [Member] | Dec. 31, 2010 Senior Secured Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of notes |  |  |  |  |  |  |  | $ 5,000,000 |
Repurchase of notes at cost |  |  |  |  |  |  |  | 4,700,000 |
Gain on repurchase notes |  |  |  |  |  |  |  | 300,000 |
Interest expense on note | 306,000 | 1,500,000 |  |  | 1,600,000 | 5,700,000 | 17,100,000 | 12,500,000 | 0
Interest paid on notes |  |  |  |  |  |  | 17,100,000 | 8,900,000 |
Senior Notes trading value |  |  |  |  |  |  | 104.56 |  |
Senior Notes base value |  |  |  |  |  |  | 100 |  |
Senior secured credit note repayment, Principal balance |  |  | 22,400,000 |  |  |  |  |  |
Subordinated note repayment, Principal balance |  |  |  | $ 100,000,000 |  |  |  |  |

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- Definition Interest Paid Long Term Debt + References No definition available. + Details
Name: | opy_InterestPaidLongTermDebt
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Repayment of principal balance of senior secured credit note. + References No definition available. + Details
Name: | opy_RepaymentOfSeniorSecuredCreditNotePrincipalBalance
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Repayment of principal balance of subordinated note. + References No definition available. + Details
Name: | opy_RepaymentOfSubordinatedNotePrincipalBalance
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Senior Notes At Par + References No definition available. + Details
Name: | opy_SeniorNotesAtPar
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The trading value of senior secured notes as of balance sheet date. + References No definition available. + Details
Name: | opy_SeniorSecuredNotesTradingValue
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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