Amortization Expense of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization	$ 5,815	$ 7,366	$ 8,298
Cost of Goods Sold
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization	3,165	3,851	3,862
Operating Expense
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization	$ 2,650	$ 3,515	$ 4,436