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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Related Party Transaction [Line Items]          
Revenues $ 53,018 $ 52,016 $ 158,351 $ 165,110  
Gross Margin 23,887 22,388 66,812 64,593  
Earnings Before Income Taxes 22,488 $ 20,967 62,742 $ 59,987  
Current Assets 69,465   69,465   $ 70,491
Non-Current Assets 39,543   39,543   41,464
Current Liabilities $ 17,353   $ 17,353   $ 15,964