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Stockholders' Equity - Summary of Activity for Outstanding Three-year PSU Awards (Parenthetical) (Detail) - PSU Awards [Member]	Dec. 31, 2016
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance units granted percentage	0.00%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance units granted percentage	200.00%

X

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options performance units granted percentage.

+ References

No definition available.

+ Details

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X

- 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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