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Stockholders' Deficit - Summary of Unrecognized Compensation Cost for Three-year PSU Awards and Weighted Average Period (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 18, 2017 | Dec. 31, 2019
Three-year PSU Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
PSU awards performance period | 3 years | 3 years
2019 Three-year PSU Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized Compensation Costs |  | $ 6.3
Weighted Average to be recognized (in years) |  | 2 years
2018 Three-year PSU Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized Compensation Costs |  | $ 1.2
Weighted Average to be recognized (in years) |  | 1 year
2017 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

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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