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Debt Costs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Debt [Line Items] |  |  |  |  |  |  |
Interest and debt costs incurred, net of interest capitalized | $ 7,547 |  |  | $ 13,009 | $ 15,146 |  |
Interest costs capitalized | 194 |  |  | 101 | 368 |  |
Total interest and debt costs | $ 7,741 |  |  | $ 13,110 | $ 15,514 |  |
Predecessor |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Interest and debt costs incurred, net of interest capitalized |  | $ 10,605 | $ 11,179 |  |  | $ 31,613 | $ 75,026
Interest costs capitalized |  | 601 | 601 |  |  | 1,818 | 4,829
Total interest and debt costs |  | $ 11,206 | $ 11,780 |  |  | $ 33,431 | $ 79,855

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