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Restructuring - Schedule of Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring And Related Activities [Abstract]    
Balance as of December 31, 2018 $ 185  
Plus: Amounts charged to cost and expense 2,063 $ 5,950
Less: Costs paid (277)  
Balance as of March 31, 2019 $ 1,971