Fair Value of Financial Instruments - Foreign Currency Exchange Contracts Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, Foreign Exchange Contract, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency derivative instruments—asset position	$ 2,556	$ 557
Foreign currency derivative instruments—liability position	316	823
Foreign Currency Fair Value Hedge Derivative at Fair Value, Net	2,240	(266)
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency derivative instruments—asset position	2,556	557
Foreign currency derivative instruments—liability position	316	823
Foreign Currency Fair Value Hedge Derivative at Fair Value, Net	$ 2,240	$ (266)