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Financial instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | $ 12,954 | $ 12,482
Total Realized and Unrealized Gains (Losses) | 329 | 515
Purchases and Issuances |  | 124
Sales and Settlements | (504) |
Transfers In (Out) |  | 11
Ending Balance | 12,779 | 13,132
Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 100 | 50
Purchases and Issuances |  | (50)
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance | 100 |
Derivative contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 2,647 | 2,347
Total Realized and Unrealized Gains (Losses) | 553 |
Purchases and Issuances |  | 1,560
Sales and Settlements |  |
Transfers In (Out) |  |
Ending Balance | 2,094 | 3,907
Mortgage and other asset-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 40 | 16
Total Realized and Unrealized Gains (Losses) | 7 | 17
Purchases and Issuances | 23 | 80
Sales and Settlements | (18) | (15)
Ending Balance | 52 | 98
Sales and Settlements |  |
Transfers In (Out) |  |
Municipal obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 9,394 | 3,562
Total Realized and Unrealized Gains (Losses) | (141) | (1,078)
Purchases and Issuances | 1,200 | 9,305
Sales and Settlements | (150) |
Ending Balance | 10,303 | 11,789
Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 62,963 | 65,001
Total Realized and Unrealized Gains (Losses) | (549) | (1,499)
Purchases and Issuances | 3,050 | 10,300
Sales and Settlements | (2,975) | (6,971)
Ending Balance | $ 62,489 | $ 66,831

X
- Definition Fair Value Assets Measured on Recurring Basis Change In Realized and Unrealized Gain Loss Included in Other Income + References No definition available. + Details
Name: | opy_FairValueAssetsMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value Liabilities Measured On Recurring Basis Change In Realized And Unrealized Gain Loss Included In Other Income + References No definition available. + Details
Name: | opy_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInRealizedAndUnrealizedGainLossIncludedInOtherIncome
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
Name: | opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesIssuances
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset sales settlements. + References No definition available. + Details
Name: | opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesSettlements
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities purchases issuances. + References No definition available. + Details
Name: | opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesPurchasesIssuances
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities sales settlements. + References No definition available. + Details
Name: | opy_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesSalesSettlements
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant