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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Related Party Transaction [Line Items]
Revenues	$ 59,071	$ 66,278	$ 113,094	$ 131,434
Gross Margin	25,193	25,369	42,204	45,827
Earnings Before Income Taxes	23,360	$ 24,102	39,020	$ 43,702
Current Assets	74,991		74,991		$ 68,399
Non-Current Assets	42,154		42,154		42,765
Current Liabilities	$ 20,958		$ 20,958		$ 19,723

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