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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 | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | $ 12,482 | $ 17,208
Realized Gains (Losses) | (9) |
Unrealized Gains (Losses) | 424 | (1,150)
Purchases & Issuances | 488 | 803
Sales & Settlements | (442) | (4,366)
Transfers In / Out | 11 | (13)
Ending Balance | 12,954 | 12,482
Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 50 |
Realized Gains (Losses) |  |
Unrealized Gains (Losses) |  |
Purchases & Issuances | (50) |
Sales & Settlements | 100 | 50
Transfers In / Out |  |
Ending Balance | 100 | 50
Derivative contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 2,347 |
Realized Gains (Losses) |  |
Unrealized Gains (Losses) | 300 |
Purchases & Issuances |  | 2,347
Transfers In / Out |  |
Ending Balance | 2,647 | 2,347
Mortgage and other asset-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 16 | 14
Realized Gains (Losses) | (7) | 70
Unrealized Gains (Losses) | 6 |
Purchases & Issuances | 116 | 14,365
Sales & Settlements | (89) | (14,433)
Transfers In / Out | (2) |
Ending Balance | 40 | 16
Beginning Balance |  |
Realized Gains (Losses) |  |
Unrealized Gains (Losses) |  |
Purchases & Issuances |  | 11
Sales & Settlements |  | (11)
Transfers In / Out |  |
Ending Balance |  |
Municipal obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 3,562 | 1,787
Realized Gains (Losses) | (4) | (52)
Unrealized Gains (Losses) | (1,757) | (256)
Purchases & Issuances | 10,035 | 2,982
Sales & Settlements | (2,442) | (899)
Ending Balance | 9,394 | 3,562
Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Beginning Balance | 65,001 | 35,908
Unrealized Gains (Losses) | (1,192) | (178)
Purchases & Issuances | 24,875 | 41,178
Sales & Settlements | (25,721) | (11,907)
Ending Balance | $ 62,963 | $ 65,001

X
- Definition Fair value liabilities measured on recurring basis change in realized gain loss included in other income. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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

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

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities purchases issuances. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities sales settlements. + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -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 d -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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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -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 d -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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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- 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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- 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
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- 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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- 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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