Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets (Liabilities)	$ (2,370)	$ 1,062
Stock-based Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets (Liabilities)	(16,729)	(20,336)
Quoted Prices in Active Markets for Identical Assets Level (1) | Stock-based Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets (Liabilities)	(16,729)	(20,336)
Significant Other Observable Inputs Level (2) | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets (Liabilities)	$ (2,370)	$ 1,062