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Commitments and Contingencies Narrative (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Loss Contingencies [Line Items] |
Auction Rate Securities Committed To Purchase related to settlements with regulators | $ 3.4
Auction Rate Securities Committed To Purchase as a Result of Legal Settlements and Awards | 3.6
Minimum [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 0.0
Maximum [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | $ 3.0

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- Definition Auction Rate Securities Committed To Purchase as a Result of Legal Settlements and Awards + References No definition available. + Details
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- Definition Auction Rate Securities Committed To Purchase related to settlements with regulators + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99385795&loc=d3e12631-108344 + Details
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- Details
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- Details
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