Deferred Income Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Tax credit carryforwards	$ 59,372	$ 124,404
Research and development expenses	181,449	183,270
Loss carryforwards	131,989	54,351
Allowances and reserves	229,056	133,068
Deferred compensation	118,878	100,122
Postretirement benefits	72,912	76,587
Other	67,942	56,185
Gross deferred income tax assets	861,598	727,987
Intangible assets	(279,592)	(132,320)
Other	(8,262)	(10,563)
Gross deferred income tax liabilities	(287,854)	(142,883)
Deferred income tax asset valuation allowances	(67,705)	(42,286)
Net deferred income tax assets	$ 506,039	$ 542,818