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Restructuring - Schedule of Major Components of Restructuring Costs (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Restructuring Cost And Reserve [Line Items]  
Restructuring Costs Incurred for the Year Ended December 31, 2019 $ 13,356
Severance and Other Termination Benefits  
Restructuring Cost And Reserve [Line Items]  
Restructuring Costs Incurred for the Year Ended December 31, 2019 6,277
Stock-Based Compensation Expense  
Restructuring Cost And Reserve [Line Items]  
Restructuring Costs Incurred for the Year Ended December 31, 2019 4,122 [1]
Accelerated Depreciation  
Restructuring Cost And Reserve [Line Items]  
Restructuring Costs Incurred for the Year Ended December 31, 2019 $ 2,957
[1] As a result of accelerated vesting of stock awards and the extension of exercise period of stock options