Stock-Based Compensation Expense - Stock-Based Compensation Expense (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Recognition period for unrecognized compensation expense	1 year 6 months 21 days
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 41,090,000	$ 31,942,000	$ 20,558,000
Income tax benefit recognized related to stock-based compensation expense	7,317,000	10,473,000	6,747,000
Compensation expense capitalized	0	0	0
Product cost of revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,447,000	1,881,000	1,052,000
Research, development, and engineering expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	14,578,000	11,022,000	6,271,000
Selling, general, and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 24,065,000	$ 19,039,000	$ 13,235,000