Stockholders' Equity and Share-Based Awards - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) shares
Performance Based Restricted Stock Units Rsu [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded \| shares	1.0
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
Aggregate grant date fair value \| $	$ 33.7
Time-Based RSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded \| shares	1.4
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
Aggregate grant date fair value \| $	$ 38.0
Share-based awards vesting terms	Vesting in equal installments over a three-year period.

Share-based compensation arrangement by share-based payment award aggregate grant date fair value.

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(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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- Definition

Net number of non-option equity instruments granted to participants.

+ 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)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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