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Debt Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized	$ 13,182	$ 13,129
Interest costs capitalized	2,944	2,872
Total interest and debt costs	$ 16,126	$ 16,001

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Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Allowance for Funds Used during Construction



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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Amount of the cost of borrowed funds accounted for as interest expense.

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