XML 117 R62.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Auction Rate Securities Owned |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Valuation Adjustment For Level Two and Three Assets | $ 4.1
Minimum [Member] | Auction Rate Securities Owned | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 2.86%
Fair Value Unobservable Input Current Yield | 2.69%
Maximum [Member] | Auction Rate Securities Owned | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.89%
Maximum [Member] | ARS purchase commitments | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Unobservable Input Current Yield | 4.05%
Other Assets | Minimum [Member] | ARS purchase commitments | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 2.86%
Fair Value Unobservable Input Current Yield | 2.69%
Other Assets | Maximum [Member] | ARS purchase commitments | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.89%
Fair Value Unobservable Input Current Yield | 4.05%

X
- Definition ARS Valuation Adjustment For Level Two and Three Assets + References No definition available. + Details
Name: | opy_ARSValuationAdjustmentForLevelTwoandThreeAssets
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair Value Input, Discount Rate + References No definition available. + Details
Name: | opy_FairValueInputDiscountRate
Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value unobservable input current yield. + References No definition available. + Details
Name: | opy_FairValueUnobservableInputCurrentYield
Namespace Prefix: | opy_
Data Type: | num:percentItemType
Balance Type: | na
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
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis=opy_AuctionRateSecuritiesOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_AuctionRatePreferredSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis=opy_AuctionRateSecuritiesPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |