Concentration of Credit Risk - Revenues by Geographic Location (Detail) - Sales [Member] - Geographic Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	17.00%	23.00%	19.00%	20.00%
Europe, Middle East, & Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	9.00%	8.00%	8.00%	9.00%
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	8.00%	7.00%	6.00%	6.00%
Total Foreign Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	34.00%	38.00%	33.00%	35.00%