Stockholders' Deficit - Number of PSUs Granted and Grant Date Fair Value of PSUs (Details)	3 Months Ended
Mar. 31, 2019 $ / shares shares
TSR
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units granted (in shares) \| shares	49,819
Fair value on grant date (in usd per share) \| $ / shares	$ 58.25
ROIC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units granted (in shares) \| shares	66,807
Fair value on grant date (in usd per share) \| $ / shares	$ 42.16
Adjusted EBITDA
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units granted (in shares) \| shares	66,807
Fair value on grant date (in usd per share) \| $ / shares	$ 42.16

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).

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

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).

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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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