Stockholders' Equity - Summary of Unrecognized Compensation Cost for Three-year PSU Awards and Weighted Average Period (Detail) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
2017 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	$ 2.1
Weighted Average to be recognized (in years)	2 years
2016 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	$ 0.5
Weighted Average to be recognized (in years)	1 year
2015 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	$ 0.0
Weighted Average to be recognized (in years)	0 years

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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