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Commitments and Contingencies - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Property, Plant and Equipment [Line Items]  
Lease accumulated amortization $ 0.1us-gaap_GroundLeasesAccumulatedAmortization
Outstanding letters of credit 21.3us-gaap_LettersOfCreditOutstandingAmount
Building  
Property, Plant and Equipment [Line Items]  
Capital lease costs included in balance sheet as property, plant and equipment 6.4us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Land  
Property, Plant and Equipment [Line Items]  
Capital lease costs included in balance sheet as property, plant and equipment $ 2.1us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember