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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, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Related Party Transaction [Line Items]          
Revenues $ 51,311 $ 53,018 $ 163,128 $ 158,351  
Gross Margin 23,421 23,887 69,672 66,812  
Earnings Before Income Taxes 22,745 $ 22,488 66,407 $ 62,742  
Current Assets 67,380   67,380   $ 73,767
Non-Current Assets 66,836   66,836   42,337
Current Liabilities $ 27,501   $ 27,501   $ 22,293