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Financial Derivatives - Effect of Company's Derivative Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Revenues $ 402,925 $ 414,371
Gains (losses) recognized from derivatives (33) (1,082)
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Foreign Currency Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in AOCI: 1,183 (2,696)
Revenues [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Foreign Currency Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) reclassified from AOCI: (501) 243
Other Income (Expense), Net [Member] | Derivatives Not Designated as Hedging Instruments under ASC 815 [Member] | Foreign Currency Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized from derivatives $ (33) (1,169)
Other Income (Expense), Net [Member] | Derivatives Not Designated as Hedging Instruments under ASC 815 [Member] | Embedded Derivatives [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized from derivatives   $ 87