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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]        
Net settlement payable $ 2,300,000   $ 2,300,000  
Estimated amount of net foreign currency derivative losses in other comprehensive income reclassified to earnings within 12 months (1,200,000)   (1,200,000)  
Cash flow hedge        
Derivative [Line Items]        
Net losses recognized in OCI (3,800,000) $ 0 (100,000) $ (8,000,000)
Foreign exchange contracts [Member]        
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges $ 190,200,000   $ 190,200,000