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Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Loss Contingencies [Line Items] |
Minimum estimated range of aggregate loss for legal proceedings | $ 0
Maximum estimated range of aggregate loss for legal proceedings | 41
Total amount of ARS the firm purchased and hold | 91.5
Amount of ARS committed to purchase from clients | 5.0
Eligible investor subject to future buyback principal value | 5
Eligible investor subject to future buyback potential additional losses related to valuation adjustments | 116.8
Period of auction rates security to be purchased from rendering of the award | 30 days
Loss contingency charged against earnings | 7.7
Scenario, Forecast [Member] |
Loss Contingencies [Line Items] |
Amount of ARS committed to purchase from clients | $ 24.0

X
- Definition The total amount of ARS the firm purchased and hold. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of ARS the firm committed to purchase from clients. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Eligible investor subject to future buyback potential additional losses related to valuation adjustments. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Eligible investor subject to future buyback principal value. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
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X
- Definition Period of auction rates security to be purchased from rendering of award. + References No definition available. + Details
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Namespace Prefix: | opy_
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Balance Type: | na
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X
- Details
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X
- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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X
- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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