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Restructuring - Schedule of Major Components of Restructuring Costs (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	$ 13,468
Restructuring Costs Incurred for the Nine Months Ended September 30, 2019	12,714
Estimated restructuring cost remaining	754
Severance and Other Termination Benefits
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	6,389
Restructuring Costs Incurred for the Nine Months Ended September 30, 2019	5,635
Estimated restructuring cost remaining	754
Stock-Based Compensation Expense
Restructuring Cost And Reserve [Line Items]
Total Restructuring Costs Expected to be Incurred	4,122
Restructuring Costs Incurred for the Nine Months Ended September 30, 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 Nine Months Ended September 30, 2019	$ 2,957