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Office Facilities - Summary of Office Facilities Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Office facilities, gross $ 133,136us-gaap_PropertyPlantAndEquipmentGross $ 130,057us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (103,547)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (97,118)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 29,589us-gaap_PropertyPlantAndEquipmentNet 32,939us-gaap_PropertyPlantAndEquipmentNet
Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Office facilities, gross 78,940us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= opy_FurnitureFixturesAndEquipmentMember		 76,857us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= opy_FurnitureFixturesAndEquipmentMember
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Office facilities, gross $ 54,196us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember		 $ 53,200us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember