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LONG-TERM DEBT - Schedule Of Long-Term Debt Outstanding (Details) - USD ($) | Aug. 07, 2019 | Sep. 30, 2019 | May 01, 2019 | Apr. 30, 2019 | Dec. 31, 2018 | Jun. 14, 2018 | Mar. 26, 2018
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Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 5,809,010,000 |  |  | $ 15,195,582,000 |  |
Long-term debt fees |  | (11,316,000) |  |  | 0 |  |
Long-term debt, net subject to compromise |  | 0 |  |  | 15,149,477,000 |  |
Less: Current portion |  | 53,705,000 |  |  | 46,105,000 |  |
Total long-term debt |  | 5,755,305,000 |  |  | 0 |  |
Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 4,311,770,000 |  |  |  |  |
Term Loan Facility due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  |  | $ 3,500,000,000 |  |  |  |
Term Loan Facility due 2026 | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 2,757,397,000 | 3,500,000,000 |  |  |  |
Debt instrument, face amount |  |  | 3,500,000,000 |  |  |  |
Stated interest rate |  | 5.25% |  |  |  |  |
Prepayment of debt | $ 740,000,000 |  |  |  |  |  |
Debtors-in-Possession Facility | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 0 |  |  |  |  |
Debtors-in-Possession Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
DIP Facility, aggregate principal amount |  |  |  |  |  | $ 450,000,000.0 |
Asset-based Revolving Credit Facility due 2023 | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 0 | 0 |  |  |  |
Asset-based Revolving Credit Facility due 2023 | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowings provided under credit facility |  | 450,000,000 |  |  |  |  |
Outstanding borrowings under facility |  | 0 |  |  |  |  |
Letters of credit outstanding |  | 49,200,000 |  |  |  |  |
Line of credit, excess availability |  | 400,800,000 |  |  |  |  |
6.375% Senior Secured Notes due 2026 | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 800,000,000 | 800,000,000 |  |  |  |
Debt instrument, face amount |  | $ 800,000,000 | 800,000,000 |  |  |  |
Stated interest rate |  | 6.375% |  |  |  |  |
5.25% Senior Secured Notes Due 2027 | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 750,000,000 |  |  |  |  |
Debt instrument, face amount | $ 750,000,000.0 |  |  |  |  |  |
Stated interest rate | 5.25% | 5.25% |  |  |  |  |
Prepayment of debt | $ 740,000,000 |  |  |  |  |  |
Accrued and unpaid interest | $ 800,000 |  |  |  |  |  |
Other secured subsidiary debt | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 4,373,000 |  |  |  |  |
8.375% Senior Unsecured Notes due 2027 | Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 1,450,000,000 | 1,450,000,000 |  |  |  |
Debt instrument, face amount |  | $ 1,450,000,000 | $ 1,450,000,000 |  |  |  |
Stated interest rate |  | 8.375% | 8.375% |  |  |  |
Other unsecured subsidiary debt | Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 58,556,000 |  |  | $ 46,105,000 |  |
9.0% Priority Guarantee Notes Due 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 9.00% |  |  |  |  |
9.0% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 9.00% |  | 9.00% |  |  |
11.25% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 11.25% |  | 11.25% |  |  |
9.0% Priority Guarantee Notes Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 9.00% |  |  |  |  |
10.625% Priority Guarantee Notes Due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 10.625% |  |  |  |  |
14.0% Senior Notes Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 14.00% |  |  |  |  | 14.00%
Liabilities Subject To Compromise | Other secured subsidiary debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | $ 6,000,000 |  |  |  |  |
Liabilities Subject To Compromise | Other unsecured subsidiary debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | 10,800,000.0 |  |  |  |  |
Liabilities Subject To Compromise | Senior Secured Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | 6,300,000,000 |  |  |  |  |
Liabilities Subject To Compromise | 9.0% Priority Guarantee Notes Due 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | 1,999,800,000 |  |  |  |  |
Liabilities Subject To Compromise | 9.0% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | 1,750,000,000 |  |  |  |  |
Liabilities Subject To Compromise | 11.25% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | 870,500,000 |  |  |  |  |
Liabilities Subject To Compromise | 9.0% Priority Guarantee Notes Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | 1,000,000,000 |  |  |  |  |
Liabilities Subject To Compromise | 10.625% Priority Guarantee Notes Due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total consolidated secured debt |  | 950,000,000 |  |  |  |  |
Liabilities Subject To Compromise | 14.0% Senior Notes Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | 1,781,600,000.0 |  |  |  |  |
Liabilities Subject To Compromise | Legacy Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 475,000,000 |  |  |  |  |

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