Components of Property and Equipment Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Capitalized software development	$ 1,041,924	$ 787,526
Computer equipment	209,328expe_ComputerEquipmentGross	178,319expe_ComputerEquipmentGross
Furniture and other equipment	146,780us-gaap_FurnitureAndFixturesGross	129,856us-gaap_FurnitureAndFixturesGross
Leasehold improvements	135,372us-gaap_LeaseholdImprovementsGross	121,084us-gaap_LeaseholdImprovementsGross
Total property and equipment, gross	1,533,404us-gaap_PropertyPlantAndEquipmentGross	1,216,785us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation	(1,011,085)	(781,477)
Projects in progress	30,807us-gaap_ConstructionInProgressGross	45,394us-gaap_ConstructionInProgressGross
Property and equipment, net	$ 553,126us-gaap_PropertyPlantAndEquipmentNet	$ 480,702us-gaap_PropertyPlantAndEquipmentNet

Computer Equipment Gross

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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