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Restructuring - Schedule of Components of the Restructuring Liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]    
Restructuring charges $ 8,777 $ 8,777
Employee Severance and Other Benefits    
Restructuring Cost And Reserve [Line Items]    
Restructuring charges   4,655
Balance at June 30, 2019 $ 4,655 $ 4,655