Components of Property, Plant and Equipment (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 7,898,920,000	$ 7,732,847,000
Accumulated depreciation	(4,728,753,000)	(4,588,299,000)
Property, plant and equipment, net	3,170,167,000	3,144,548,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	203,983,000	197,429,000
Assets Held For Future Use [Member]
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	73,600,000
Computer Equipment and Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,442,443,000	5,345,314,000
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,898,946,000	1,872,559,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	120,656,000	120,654,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 232,892,000	$ 196,891,000