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Stockholders' Equity - Summary of Changes in Common Shares Available for Awards under Omnibus Incentive Plan and Predecessor Plans (Parenthetical) (Detail) shares in Millions	Dec. 31, 2016 shares
PSU and SLO Awards [Member].
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contingently issuable shares	3.3

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- Definition

Contingently issuable shares.

+ References

No definition available.

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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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