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Summary of Significant Accounting Policies - Additional Information (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items] |  |  |
Purchase of additional shares of OMHHF | $ 3,000,000 opy_NoncontrollingInterestIncreaseFromPurchase |  |
Purchase percentage of additional shares of OMHHF | 16.32%opy_IntendsToPurchaseNoncontrollingInterest |  |
Company owned OMHHF |  | 83.68%opy_MajorityInterestOwnershipPercentageByParent |
Non-controlling interest |  | 6,088,000 us-gaap_MinorityInterest | 5,353,000 us-gaap_MinorityInterest
Carrying value of intangibles |  | 31,700,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 31,700,000 us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization of mortgage servicing rights period |  | 10 years |
Cash equivalents maximum maturity period of highly liquid investments |  | 90 days |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loan forgiven over service period |  | 3 years |
Minimum | Furniture, fixtures and equipment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation and amortization on straight-line basis |  | 3 years |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loan forgiven over service period |  | 5 years |
Maximum | Furniture, fixtures and equipment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation and amortization on straight-line basis |  | 7 years |
Securities |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of business days for related transactions |  | 3 days |
Commodities |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of business days for related transactions |  | 1 day |
Trademarks and Trade Name |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Carrying value of intangibles |  | $ 31,700,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = opy_TrademarksAndTradeNameMember |

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