Restructuring - Schedule of Major Components of Restructuring Costs (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	$ 13,356
Restructuring Costs Incurred for the Year Ended December 31, 2019	13,356
Severance and Other Termination Benefits
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	6,277
Restructuring Costs Incurred for the Year Ended December 31, 2019	6,277
Stock-Based Compensation Expense
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	4,122
Restructuring Costs Incurred for the Year Ended December 31, 2019	4,122
Accelerated Depreciation
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	2,957
Restructuring Costs Incurred for the Year Ended December 31, 2019	$ 2,957