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Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
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Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at Beginning of Period | $ 16,165 |  |  | $ 2,700 | $ 1,800
Additions at Cost |  |  | $ 1,800 |  | 900
Deductions | $ 16,165 | [1] |  | 2,630 |
Balance at End of Period |  |  | $ 1,800 | $ 70 | $ 2,700
[1] | Approximately $15.4 million was deducted from the allowance for doubtful accounts in conjunction with the application of fresh-start accounting upon emergence from Chapter 11 bankruptcy

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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