Geographical Information - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	$ 269,285	$ 273,221
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	266,949	269,721
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	$ 2,336	$ 3,500