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Schedule of Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	35.00%	35.00%	35.00%
Foreign taxes	127.10%	(16.50%)	(58.10%)
U.S. research and development credit	15.80%	(3.00%)	(7.90%)
Domestic production activities deduction	2.30%	(1.00%)	(0.50%)
State income taxes, net of federal tax benefit	2.30%	0.40%	(0.10%)
Equity compensation	(2.70%)	0.60%	(1.80%)
Uncertain tax positions	(2.60%)	2.20%	7.90%
Goodwill impairment	(162.10%)		36.30%
Other, net	6.00%	0.70%	4.00%
Effective tax rate, Total	21.10%	18.40%	14.80%

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