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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]        
Net settlement receivable     $ 3,000,000  
Estimated amount of net foreign currency derivative losses in other comprehensive income reclassified to earnings within 12 months $ (2,500,000)   (2,500,000)  
Cash flow hedge        
Derivative [Line Items]        
Net gains (losses) recognized in OCI 1,600,000 $ 3,400,000 3,700,000 $ (8,000,000)
Foreign exchange contracts [Member]        
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges $ 193,700,000   $ 193,700,000