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Property and Equipment - Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Furniture and equipment $ 161,994us-gaap_FurnitureAndFixturesGross $ 162,128us-gaap_FurnitureAndFixturesGross
Buildings and building improvements 135,241us-gaap_BuildingsAndImprovementsGross 134,993us-gaap_BuildingsAndImprovementsGross
Land and land improvements 39,609esi_LandAndLandImprovementsGross 39,609esi_LandAndLandImprovementsGross
Leasehold improvements 35,738us-gaap_LeaseholdImprovementsGross 20,953us-gaap_LeaseholdImprovementsGross
Software 8,263us-gaap_CapitalizedComputerSoftwareGross 8,620us-gaap_CapitalizedComputerSoftwareGross
Construction in progress 766us-gaap_ConstructionInProgressGross 156us-gaap_ConstructionInProgressGross
Property and Equipment Gross 381,611us-gaap_PropertyPlantAndEquipmentGross 366,459us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization (224,539)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (197,950)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net $ 157,072us-gaap_PropertyPlantAndEquipmentNet $ 168,509us-gaap_PropertyPlantAndEquipmentNet