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Stockholders' Equity and Stock-Based Compensation - Summary of Market-based Restricted Stock Vesting Activity (Parenthetical) (Detail) - Market-based Restricted Stock [Member] - Market-based [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Vest Date May 13, 2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
TEV $ 3,500
Vest Date June 20, 2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
TEV 3,900
Vest Date August 25, 2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
TEV 4,150
Vest Date September 7, 2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
TEV 4,200
Vest Date October 13, 2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
TEV $ 4,450