Components of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Furniture and fixtures	$ 185,933	$ 180,800
Equipment and software	5,129,879	4,680,118
Buildings and improvements	1,806,957	1,748,214
Land	123,334	117,513
Building construction in progress	190,934	146,650
Property, Plant and Equipment, Gross, Total	7,437,037	6,873,295
Accumulated depreciation	(4,453,591)	(4,040,146)
Property, plant and equipment, net	2,983,446	2,833,149
Assets Held For Future Use [Member]
Property, Plant and Equipment [Line Items]
Building construction in progress	$ 66,500