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Share-Based Compensation - Schedule of Information with Respect to all Outstanding Restricted Stock (Parenthetical) (Detail) - Restricted Stock Units [Member] - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date adjusted fair value per unit	$ 16.31	$ 12.70	[1]
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date adjusted fair value per unit		10.59
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date adjusted fair value per unit		$ 12.70
[1] The weighted average grant-date fair value per unit as of December 31, 2018 reflects an adjusted fair value per unit from $10.59 to $12.70 due to the modification of grants approved by the Board of Directors during the current quarter for our performance-based grants granted on December 14, 2018.

X

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ 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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