Aggregate Purchase Price Allocation for Acquisitions Based on Final Estimates of Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2011
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 4,861	$ 1,787,516	$ 35,556
Inventory				84,659
Other current assets				140,546
Property, plant and equipment				178,495
Identifiable intangible assets				844,100
Goodwill				952,108
Other long-term assets				15,969
Total assets				2,215,877
Current liabilities				107,243
Long-term liabilities				313,594
Total liabilities				420,837
Net assets				1,795,040
Astra Tech [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 4,300