Stock-based Compensation - Schedule of Weighted Average Grant Date Fair Value Per Share of Performance-Based RSUs Assumptions Used to Estimate Fair Value (Detail) - $ / shares	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share	$ 28.66
Performance-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share	28.59
Performance-based RSUs [Member] \| Short-term.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share	$ 28.59	$ 47.28
Service period (years)	1 year	1 year
Performance-based RSUs [Member] \| Long-term.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share		$ 45.89
Service period (years)	0 years
Performance-based RSUs [Member] \| Long-term. \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period (years)		2 years
Performance-based RSUs [Member] \| Long-term. \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period (years)		3 years

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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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