Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	35.00%	35.00%	35.00%
Goodwill impairment	12.10%
Foreign tax rate variances	(14.20%)	(7.70%)	(8.10%)
Tax credits	(7.00%)	(3.70%)	(4.30%)
Change in Valuation Allowances	(7.50%)	1.30%	0.10%
Current year losses with no benefit	4.30%	2.10%	4.10%
Net operating loss carry-forwards	(0.20%)	(2.30%)	(0.50%)
Changes in tax reserves	1.30%	0.50%	1.40%
U.S. Expense Allocation	3.20%	2.00%	2.70%
Earnings of equity investments	(0.20%)	(0.10%)	(0.20%)
Withholding taxes	3.50%	2.80%	1.20%
State taxes, net of federal benefit	0.40%	0.20%	0.30%
Change in U.S. tax rate	4.80%
Deemed mandatory repatriation	4.90%
Other, net	(0.20%)	0.00%	0.60%
Effective income tax rate	40.20%	30.10%	32.30%