Performance period.

No definition available.

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- Definition

The number of grants made 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

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

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Period Type:	duration

- Details

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- Details

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Period Type:

- Details

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Stockholders' Equity (Deficit) - Summary of Number of PSUs Granted Based on Adjusted EBITDA and Grant Date Fair Value (Detail) - $ / shares		12 Months Ended
	May 18, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
PSUs – Adjusted EBITDA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Number of units granted (in shares)		57,378	99,522	165,391
Fair value on grant date (in usd per share)		$ 41.72	$ 45.21	$ 43.09
2017 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
2016 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years