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Debt Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized	$ 13,247	$ 12,559	$ 26,429	$ 25,688
Interest costs capitalized	2,823	3,410	5,767	6,282
Total interest and debt costs	$ 16,070	$ 15,969	$ 32,196	$ 31,970

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Amount of interest capitalized during the period.

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