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Restructuring, Severance and Other Charges - Summary of Restructuring Liabilities Comprised of Accruals for Severance and Termination Benefits (Detail) - USD ($)
3 Months Ended
Sep. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
2020 Restructuring Plan [Member]      
Condensed Comprehensive Income [Line Items]      
Charges   $ 0 $ 0
Cash payments $ (33,600,000)    
2020 Restructuring Plan [Member] | Severance and Termination Benefits [Member]      
Condensed Comprehensive Income [Line Items]      
Severance/restructuring and other accruals, Beginning balance   19,311,000  
Cash payments   (8,029,000)  
Severance/restructuring and other accruals, Ending balance   11,282,000  
2019 Restructuring Plan [Member]      
Condensed Comprehensive Income [Line Items]      
Charges   0 $ 0
2019 Restructuring Plan [Member] | Severance and Termination Benefits [Member]      
Condensed Comprehensive Income [Line Items]      
Severance/restructuring and other accruals, Beginning balance   279,000  
Cash payments   (127,000)  
Severance/restructuring and other accruals, Ending balance   $ 152,000