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Stock-Based Compensation - Performance Stock Units - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance stock, shares granted |  | 1,784,478
2017 Omnibus Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance stock, shares granted |  | 3,938,285
Performance Stock Units [Member] | 2017 Omnibus Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Increase in common stock starting price | $ 12.48 |
Unrecognized stock-based compensation expense related to performance stock units |  | $ 1.5
Unrecognized stock-based compensation expense, expected recognition weighted-average period |  | 42 months
Performance Stock Units [Member] | Tranche One [Member] | 2017 Omnibus Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percentage | 50.00% |
Performance Stock Units [Member] | Tranche Two [Member] | 2017 Omnibus Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percentage | 100.00% |
Performance Stock Units [Member] | Tranche Three [Member] | 2017 Omnibus Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percentage | 120.00% |
Performance Stock Units [Member] | Three Executive Officers [Member] | 2017 Omnibus Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance stock, shares granted | 311,667 |

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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=120381028&loc=d3e5070-113901 + Details
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