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Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate	21.00%	35.00%	35.00%
State taxes, net of federal tax effect	(1.30%)	2.50%	1.60%
Foreign earnings taxed at different rates	(20.50%)	(24.20%)	(15.40%)
Withholding tax	5.50%	1.90%	1.30%
Foreign tax credit	(5.20%)	(1.10%)	(0.90%)
Other international components	0.30%	0.00%	(0.10%)
Change in valuation allowance	2.50%	0.20%	(0.80%)
Deferred tax adjustments and rate changes	(1.70%)	4.00%	0.00%
Section 199 Deduction	(0.00%)	(1.40%)	(1.80%)
Subpart F income	7.00%	1.50%	0.60%
Research and development tax credit	(11.80%)	(1.10%)	(0.80%)
GILTI, net of foreign tax credit	0.50%	0.00%	0.00%
FDII	(4.50%)	(0.00%)	(0.00%)
Transition Tax	(15.20%)	55.40%	0.00%
Other permanent differences	13.50%	1.80%	1.00%
Total	(9.90%)	74.50%	19.70%

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