Income Taxes - Reconciliation of the Federal Statutory Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	34.00%
State tax, net of federal benefit	1.70%	1.30%	(2.10%)
Effect of foreign taxes	(0.60%)	(1.90%)	1.40%
Subpart F income	1.70%	1.60%	2.20%
Valuation allowance	0.10%	(2.60%)	0.40%
Foreign deferred tax liability offset	(0.20%)	1.50%	(0.90%)
Manufacturing deduction	(1.50%)	(2.50%)	(2.80%)
Research & development tax credits	(0.60%)	(0.70%)	(1.50%)
Stock options exercises	(15.80%)	(0.70%)	0.60%
Uncertain tax positions	0.60%	2.00%	0.60%
Other permanent differences	1.00%	1.20%	1.30%
Change in tax laws	2.90%	0.00%	0.00%
Deferred tax remeasurement	(5.00%)	0.00%	0.00%
Other	(0.70%)	0.50%	(1.10%)
Effective tax rate	18.60%	34.80%	32.10%