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Stockholders' Equity and Share-Based Awards - Summary of Total Unrecognized Compensation Cost Related to Stock-based Compensation (Detail) - Restricted Stock Units (RSUs) [Member]
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost $ 65.3
Weighted-Average Period of Expense Recognition (in years) 1 year