Amortization Expense of Company's Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Finite Lived Intangible Assets [Line Items]
Cost of goods sold	$ 714	$ 772	$ 1,428	$ 1,200
Amortization of purchased intangible assets	379	426	758	747
Operating expenses
Finite Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	379	426	758	747
Cost Of Goods Sold And Operating Expense
Finite Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$ 1,093	$ 1,198	$ 2,186	$ 1,947