Components of Property, Plant and Equipment (Detail) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Furniture and fixtures	$ 184,273,000	$ 180,800,000
Equipment and software	4,851,949,000	4,680,118,000
Buildings and improvements	1,768,677,000	1,748,214,000
Land	117,790,000	117,513,000
Building construction in progress	146,650,000	146,650,000
Property, Plant and Equipment, Gross, Total	7,069,339,000	6,873,295,000
Accumulated depreciation	(4,190,075,000)	(4,040,146,000)
Property, plant and equipment, net	$ 2,879,264,000	$ 2,833,149,000