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Summary of Significant Accounting Policies - Other Income (Expense) Net (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency forward contract gain, net   $ 2,910,000 $ 6,947,000 $ 10,085,000
Foreign currency transaction gain (loss), net   9,024,000 (5,838,000) (2,824,000)
Other   1,989,000 485,000 518,000
Other income, net   24,969,000 1,594,000 7,779,000
Other income (expense)        
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency forward contract gain, net   2,156,000 4,176,000 9,705,000
Currency Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Settlement of cross-currency swap contract   18,510,000 11,212,000  
Currency Swap | Other income (expense)        
Derivative Instruments, Gain (Loss) [Line Items]        
Settlement of cross-currency swap contract $ 11,046,000 $ 11,046,000 $ 0 $ 0