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Debt Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Debt [Line Items]        
Interest and debt costs incurred, net of interest capitalized $ 12,239us-gaap_InterestExpense $ 12,250us-gaap_InterestExpense $ 37,927us-gaap_InterestExpense $ 31,081us-gaap_InterestExpense
Interest costs capitalized 3,638us-gaap_InterestCostsCapitalized 2,643us-gaap_InterestCostsCapitalized 9,920us-gaap_InterestCostsCapitalized 8,241us-gaap_InterestCostsCapitalized
Total interest and debt costs $ 15,877us-gaap_InterestCostsIncurred $ 14,893us-gaap_InterestCostsIncurred $ 47,847us-gaap_InterestCostsIncurred $ 39,322us-gaap_InterestCostsIncurred