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Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax effect	2.50%	1.60%	1.70%
Foreign earnings taxed at different rates	(24.20%)	(15.50%)	(14.00%)
Withholding tax	1.90%	1.40%	1.10%
Foreign tax credit	(1.10%)	(1.00%)	(0.30%)
Other international components	0.00%	(0.10%)	0.80%
Change in valuation allowance	0.20%	(0.80%)	(0.10%)
Deferred tax adjustments and rate changes	5.20%	0.10%	(0.10%)
Deemed repatriation transition tax	55.50%	0.00%	0.00%
Subpart F income	1.50%	0.60%	0.50%
Research and development tax credit	(1.10%)	(0.80%)	(0.60%)
Section 199 Deduction	(1.40%)	(1.80%)	(1.50%)
Other permanent differences	1.70%	0.90%	0.70%
Total	75.70%	19.60%	23.20%

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