Gross Carrying Amounts and Net Book Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount - Finite-Lived Intangible Assets	$ 949,195	$ 933,434
Accumulated Amortization - Finite-Lived Intangible Assets	(159,682)	(99,632)
Net Book Value - Finite-Lived Intangible Assets	789,513	833,802
Gross Carrying Amount - Total Intangible Assets	983,406	969,584
Net Book Value - Total Intangible Assets	823,724	869,952
Acquired IPR&D assets [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
In-process research and development	34,211	36,150
Acquired developed technologies [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	11 years 8 months 24 days
Gross Carrying Amount - Finite-Lived Intangible Assets	946,595	930,834
Accumulated Amortization - Finite-Lived Intangible Assets	(157,423)	(97,578)
Net Book Value - Finite-Lived Intangible Assets	789,172	833,256
Trademarks [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	1 year 3 months
Gross Carrying Amount - Finite-Lived Intangible Assets	2,600	2,600
Accumulated Amortization - Finite-Lived Intangible Assets	(2,259)	(2,054)
Net Book Value - Finite-Lived Intangible Assets	$ 341	$ 546