Balance Sheet Components - Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 13,738,839	$ 10,650,897
Less accumulated depreciation	(4,344,237)	(3,451,687)
Property, plant and equipment, net	9,394,602	7,199,210
Core systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,334,702	4,760,868
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,906,686	2,785,799
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,850,351	1,599,424
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	425,428	645,388
Personal property
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	798,133	622,069
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 423,539	$ 237,349