Detail of Acquired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	$ 746,696	$ 579,411
Accumulated amortization	(154,411)	(125,841)
Net	592,285	453,570
Finite-life intangibles
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	494,662	373,656
Accumulated amortization	(154,411)	(125,841)
Net	340,251	247,815
Finite-life intangibles | Patents
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	5,896	15,469
Accumulated amortization	(4,038)	(12,695)
Net	1,858	2,774
Finite-life intangibles | Proprietary technology
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	128,841	74,176
Accumulated amortization	(39,956)	(29,862)
Net	88,885	44,314
Finite-life intangibles | Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	358,410	282,479
Accumulated amortization	(109,887)	(82,901)
Net	248,523	199,578
Finite-life intangibles | Trade names
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	1,515	1,532
Accumulated amortization	(530)	(383)
Net	985	1,149
Indefinite-life intangibles | Trade names
Acquired Intangible Assets by Major Class [Line Items]
Gross carrying amount	252,034	205,755
Net	$ 252,034	$ 205,755