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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 ($)
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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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