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Debt Costs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Debt [Line Items]        
Interest and debt costs incurred, net of interest capitalized $ 12,559 $ 9,918 $ 25,688 $ 18,831
Interest costs capitalized 3,410 2,636 6,282 5,598
Total interest and debt costs $ 15,969 $ 12,554 $ 31,970 $ 24,429