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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Foreign exchange contracts [Member]        
Derivative [Line Items]        
Notional amount of foreign currency derivative hedges $ 443,700,000   $ 443,700,000  
Cash flow hedge [Member]        
Derivative [Line Items]        
Derivative instrument gain (loss) 1,400,000 $ (200,000) (600,000) $ (6,700,000)
Cash flow hedge [Member] | Foreign exchange contracts [Member]        
Derivative [Line Items]        
Estimated amount of net derivative gains in accumulated other comprehensive income reclassified to earnings within 12 months $ 1,200,000   $ 1,200,000