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Debt Costs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Debt Disclosure [Abstract] |  |  |  |
Interest and debt costs incurred, net of interest capitalized | $ 18,477 | $ 13,247 | $ 35,431 | $ 26,429
Interest costs capitalized | 1,101 | 2,823 | 2,494 | 5,767
Total interest and debt costs | $ 19,578 | $ 16,070 | $ 37,925 | $ 32,196

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