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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

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- Definition

Enterprise value.

+ References

No definition available.

+ Details

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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.

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