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Derivatives and Hedging Instruments - Summary of Effects of Derivatives on Cash Flow Hedging Relationships in Company's Statements of Income, Derivatives Designated as Hedging Instruments (Detail) - Cash Flow Hedges - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Foreign currency exchange contracts    
Derivative [Line Items]    
Gain or (Loss) Recognized in OCI- Effective Portion $ 2,302 $ 1,404
Foreign currency exchange contracts | Salaries and employee benefits    
Derivative [Line Items]    
Gain or (Loss) Reclassified from OCI into Income - Effective Portion 1,280 755
Foreign currency exchange contracts | Other (expense) income    
Derivative [Line Items]    
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing 0 0
Foreign currency exchange contracts    
Derivative [Line Items]    
Gain or (Loss) Recognized in OCI- Effective Portion 310 (5)
Foreign currency exchange contracts | General and administrative expenses    
Derivative [Line Items]    
Gain or (Loss) Reclassified from OCI into Income - Effective Portion 76 105
Foreign currency exchange contracts | Other (expense) income    
Derivative [Line Items]    
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing 0 0
Interest rate swap agreements    
Derivative [Line Items]    
Gain or (Loss) Recognized in OCI- Effective Portion 9 (131)
Interest rate swap agreements | Interest expense    
Derivative [Line Items]    
Gain or (Loss) Reclassified from OCI into Income - Effective Portion 110 0
Interest rate swap agreements | Other (expense) income    
Derivative [Line Items]    
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing $ 0 $ 0