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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative [Line Items]        
Net settlement asset     $ 3,800,000  
Estimated amount of net foreign currency derivative gains (loss) in other comprehensive income reclassified to earnings $ (3,600,000)   (3,600,000)  
Foreign exchange contracts [Member]        
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges 207,900,000   207,900,000  
Cash flow hedge [Member]        
Derivative [Line Items]        
Net gains (losses) recognized in OCI $ (3,400,000) $ (1,900,000) $ (8,000,000) $ 2,000,000