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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]    
Net settlement receivable $ 1,500,000  
Estimated amount of net foreign currency derivative gains in other comprehensive income reclassified to earnings 2,500,000  
Cash flow hedge    
Derivative [Line Items]    
Net gains (losses) recognized in OCI 2,100,000 $ (4,600,000)
Foreign exchange contracts [Member]    
Derivative [Line Items]    
Notional amount of foreign currency derivative hedges $ 185,700,000