Stock-based Compensation - Performance-Based RSUs (Detail) - $ / shares	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in USD per share)	$ 28.14
Performance-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in USD per share)	28.26
Performance-based \| Short-term
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in USD per share)	$ 28.26	$ 47.23
Service period (years)	1 year	1 year
Performance-based \| Long-term
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in USD per share)	$ 0.00	$ 45.96
Performance-based \| Long-term \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period (years)		2 years
Performance-based \| Long-term \| Maximum
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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&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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