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Schedule of Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	35.00%	35.00%	35.00%
U.S. transition tax	28.70%
Impact of rate change on deferred tax	6.40%
Uncertain tax positions	1.70%	(2.60%)	2.20%
Foreign taxes	(16.30%)	78.00%	(13.80%)
Foreign tax credits	(2.20%)	49.10%	(2.70%)
U.S. research and development credit	(1.60%)	15.80%	(3.00%)
Equity compensation	(0.80%)	(2.70%)	0.60%
Domestic production activities deduction	(0.30%)	2.30%	(1.00%)
State income taxes, net of federal tax benefit		2.30%	0.40%
Goodwill impairment		(162.10%)
U.S. alternative minimum tax credit		3.70%
Inventory cost capitalization		1.80%
Other, net	0.30%	0.50%	0.70%
Effective tax rate, Total	50.90%	21.10%	18.40%

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