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Debt Costs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Debt [Line Items] |  |  |  |
Interest and debt costs incurred, net of interest capitalized | $ 7,547 |  | $ 15,146 |
Interest costs capitalized | 194 |  | 368 |
Total interest and debt costs | $ 7,741 |  | $ 15,514 |
Predecessor |  |  |  |
Debt [Line Items] |  |  |  |
Interest and debt costs incurred, net of interest capitalized |  | $ 10,605 |  | $ 31,613
Interest costs capitalized |  | 601 |  | 1,818
Total interest and debt costs |  | $ 11,206 |  | $ 33,431

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