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Employee Benefit Plans - Assumption Rates Used for Net Periodic Benefit Costs (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Domestic Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate minimum 3.10% 3.20% 3.70%
Discount rate maximum 4.00% 4.20% 4.20%
Expected return on assets 5.60% 5.60% 5.50%
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate minimum 1.80% 2.20% 2.20%
Discount rate maximum 2.80% 3.70% 3.70%
Salary increase minimum 1.80% 2.00% 2.00%
Salary increase maximum 3.50% 4.20% 4.20%
Expected return on assets, minimum 1.80% 1.80% 2.30%
Expected return on assets, maximum 3.00% 3.00% 5.12%