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Commitments and Contingencies Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 11, 2019
Loss Contingencies [Line Items] |  |
Auction Rate Securities Committed To Purchase related to settlements with regulators | $ 7,000,000 |
SEC - SCSD Initiative Settlement Amount |  | $ 3,500,000
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 0 |
Eligible Investor Subject To Future Buyback Potential Additional Losses Related To Valuation Adjustments | 0 |
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 21,000,000 |
Auction Rate Securities [Member] |  |
Loss Contingencies [Line Items] |  |
Amount Of Auction Rate Securities Firm Purchased And Hold | 40,700,000 |
Auction Rate Securities Purchase Commitment [Member] |  |
Loss Contingencies [Line Items] |  |
Auction Rate Securities Committed To Purchase From Client | $ 7,400,000 |

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

X
- Definition Auction Rate Securities Committed To Purchase related to settlements with regulators + References No definition available. + Details
Name: | opy_AuctionRateSecuritiesCommittedToPurchaserelatedtosettlementswithregulators
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Eligible investor subject to future buyback potential additional losses related to valuation adjustments. + References No definition available. + Details
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- Definition SEC - SCSD Initiative Settlement Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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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X
- 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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- Details
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X
- Details
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