Fair Value Measurements - Schedule of Fair Value Hierarchy for those Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Foreign Currency Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	$ 1,009	$ 370
Stock-based Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	(13,877)	(14,644)
Quoted Prices in Active Markets for Identical Assets Level (1) | Foreign Currency Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	0	0
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 Derivative Assets (Liabilities)	(13,877)	(14,644)
Significant Other Observable Inputs Level (2) | Foreign Currency Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	1,009	370
Significant Other Observable Inputs Level (2) | Stock-based Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	0	0
Significant Unobservable Inputs Level (3) | Foreign Currency Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	0	0
Significant Unobservable Inputs Level (3) | Stock-based Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Derivative Assets (Liabilities)	$ 0	$ 0