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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Foreign exchange contracts [Member]        
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges $ 378,300,000   $ 378,300,000  
Cash flow hedge [Member]        
Derivative [Line Items]        
Derivative instrument losses (200,000) $ (700,000) (6,700,000) $ (200,000)
Cash flow hedge [Member] | Foreign exchange contracts [Member]        
Derivative [Line Items]        
Estimated amount of net derivative losses in accumulated other comprehensive income reclassified to earnings within 12 months $ 3,300,000   $ 3,300,000