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Financial Derivatives - Effect of Company's Derivative Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Revenues $ 389,006 $ 396,785 $ 791,931 $ 811,156
Gains (losses) recognized from derivatives (432) (345) (465) (1,427)
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: 3,586 (305) 4,769 (3,001)
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: 631 193 130 436
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 $ (432) (93) $ (465) (1,262)
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   $ (252)   $ (165)