Goodwill and Identified Intangible Assets - Allocation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense for identified intangibles	$ 6,502	$ 20,520	$ 27,329
Cost of revenue [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense for identified intangibles	719	13,745	19,233
Operating expense [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense for identified intangibles	$ 5,783	$ 6,775	$ 8,096