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Debt Costs (Detail) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 31, 2017
Debt [Line Items] |  |  |  |
Interest and debt costs incurred, net of interest capitalized |  | $ 13,009 | $ 30,439 |
Interest costs capitalized |  | 101 | 521 |
Total interest and debt costs |  | $ 13,110 | $ 30,960 |
Predecessor |  |  |  |
Debt [Line Items] |  |  |  |
Interest and debt costs incurred, net of interest capitalized | $ 11,179 |  |  | $ 75,026
Interest costs capitalized | 601 |  |  | 4,829
Total interest and debt costs | $ 11,780 |  |  | $ 79,855

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