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Derivatives and Hedging - Location of Gains and Losses in Consolidated Condensed Statements of Operations that were Recognized and Derivative Contract Type (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign currency exchange contracts, amount of gain (loss) recognized in income on derivatives not designated as hedging instruments $ (7,688) $ (2,917) $ 2,877
Foreign currency transaction gains (loss), net 808 226 (1,611)
Other income (expense)      
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign currency exchange contracts, amount of gain (loss) recognized in income on derivatives not designated as hedging instruments $ (7,985) $ (6,563) $ 1,322