Other Assets - Components of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Value added tax recoverable	$ 10,387	$ 12,509
Other	6,508	3,202
Other assets	$ 16,895	$ 15,711