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Indebtedness - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 02, 2018 | Jul. 31, 2017 | Jul. 31, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 07, 2018
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 350,000,000 | $ 350,000,000 | $ 350,000,000 |  |  |  |  |  |
Debt instrument maturity year |  | 2022 |  |  |  |  |  |  |  |
Net proceeds of each qualified asset sale |  |  |  |  | $ 32,742,000 | $ 12,968,000 |  |  |  |
Restricted cash |  |  |  |  | $ 21,300,000 | $ 5,213,000 |  | $ 21,300,000 |  |
Tendered Notes |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 46,023
8.00% New Secured Notes Due August 2022 |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% |  | 8.00% |  |
Aggregate principal amount |  | $ 350,000,000 | $ 350,000,000 | $ 350,000,000 |  |  |  |  |  |
Debt instrument maturity year |  |  | 2022 |  |  |  |  |  |  |
Fair valuin U.S. dollar equivalent |  |  |  |  | $ 359,800,000 | $ 361,500,000 |  | $ 359,800,000 |  |
Debt instrument fixed interest rate |  | 8.00% | 8.00% | 8.00% |  |  |  |  |  |
Plan of Reorganization | 8.00% New Secured Notes Due August 2022 |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  | Aug. 01, 2022 |  |  |  |  |  |  |
Debt instrument interest term |  |  | Interest on the New Secured Notes will accrue at a rate of 8.00% per annum payable quarterly in arrears on February 1, May 1, August 1, and November 1 of each year in cash, beginning November 1, 2017. |  |  |  |  |  |  |
Debt instrument frequency of periodic payment of interest |  |  | Quarterly |  |  |  |  |  |  |
Debt Instrument default description |  |  | The New Secured Notes have minimum interest coverage requirement (EBITDA/Interest), for which compliance will first be measured for the twelve months ending June 30, 2019. Minimum liquidity requirements and other covenants are set forth in the Indenture and are in effect from July 31, 2017. The Indenture also contains certain customary events of default and a make-whole provision. |  |  |  |  |  |  |
Debt instrument collateral description |  |  | the New Secured Notes and the guarantees by the Guarantors will be secured by the Collateral (as defined in the Indenture) pursuant to the terms of the Indenture and the related security documents. The Trustee’s liens upon the Collateral and the right of the holders of tThe New Secured Notes to the benefits and proceeds of the Trustee’s liens on the Collateral will terminate and be discharged in certain circumstances described in the Indenture, including: (i) upon satisfaction and discharge of the Indenture in accordance with the terms thereof; or (ii) as to any Collateral of the company or the Guarantors that is sold, transferred or otherwise disposed of by the company or the Guarantors in a transaction or other circumstance that complies with the terms of the Indenture, at the time of such sale, transfer or other disposition. The company is obligated to offer to repurchase the New Secured Notes at par in amounts that generally approximate 65% of asset sale proceeds depending upon the types of assets sold as defined in the Indenture. The company maintains a restricted cash account to accumulate the net proceeds of each qualified asset sale, which account had a balance of $21.3 million at December 31, 2017. In the event the holders of the New Secured Notes do not accept the company’s offer to repurchase the notes the accumulated cash would become available to the company for its general use. |  |  |  |  |  |  |
Percentage of asset sale proceeds to repurchase notes at par amount |  | 65.00% |  |  |  |  |  |  |  |
Debt instrument repurchase period |  | 60 days |  |  |  |  |  |  |  |
Debt instrument repurchase accumulation amount |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |
Net proceeds of each qualified asset sale |  |  |  |  |  |  |  | 21,300,000 |  |
Level 2 | Plan of Reorganization | 8.00% New Secured Notes Due August 2022 |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Fair valuin U.S. dollar equivalent |  |  |  |  | $ 359,800,000 |  |  | $ 359,800,000 |  |
Offer | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year | 2022 |  |  |  |  |  |  |  |  |
Debt instrument fixed interest rate | 8.00% |  |  |  |  |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds of each qualified asset sale |  |  |  | $ 2,172,000 |  |  | $ 3,072,000 |  | $ 14,797,000 |
Fair valuin U.S. dollar equivalent |  |  |  |  |  |  |  |  | $ 280,000,000 |
Predecessor | Offer |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase period |  | 60 days |  | 60 days |  |  |  |  |  |
Percentage of proceeds from Asset Sales, net of commission paid |  | 65.00% |  |  |  |  |  |  |  |
Minimum | Predecessor | Offer |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase accumulation amount |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |
Maximum | Offer | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 24,700,000 |  |  |  |  |  |  |  |  |

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