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Indebtedness - Additional Information (Detail) - USD ($) | Feb. 02, 2018 | Jul. 31, 2017 | Jun. 30, 2018 | Mar. 07, 2018 | Dec. 31, 2017
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Debt [Line Items] |  |  |  |  |
Restricted cash |  |  | $ 5,213,000 |  | $ 21,300,000
Tendered Notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Debt Instrument Face Amount |  |  |  | $ 46,023 |
Offer | Senior Secured Notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Debt instrument fixed interest rate | 8.00% |  |  |  |
Debt instrument maturity year | 2022 |  |  |  |
Predecessor | Offer |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Debt instrument repurchase period |  | 60 days |  |  |
Percentage of proceeds from Asset Sales, net of commission paid |  | 65.00% |  |  |
Minimum | Predecessor | Offer |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Net proceeds realized from asset sales exceed amount |  | $ 10,000,000 |  |  |
Maximum | Offer | Senior Secured Notes |  |  |  |  |
Debt [Line Items] |  |  |  |  |
Debt Instrument Face Amount | $ 24,700,000 |  |  |  |

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