Amortization Expense Related to Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]
Proprietary technology amortization included in cost of revenue									$ 88,631	$ 81,986	$ 81,215
Intangible amortization included in operating expenses	$ 10,903	$ 5,365	$ 5,417	$ 4,162	$ 4,133	$ 5,712	$ 6,624	$ 6,703	25,847	23,172	31,280
Total intangible amortization expense	$ 71,204				$ 58,316				71,204	58,316	67,204
Proprietary Technology [Member]
Goodwill And Intangible Assets [Line Items]
Proprietary technology amortization included in cost of revenue									$ 45,357	$ 35,144	$ 35,924