Goodwill and Other Intangible Assets - Summary of Amortized Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired technology	$ 7,546	$ 7,450	$ 7,450
Amortization of other acquired intangible assets	12,757	12,742	12,692
Amortization expense	$ 20,303	$ 20,192	$ 20,142