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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Related Party Transaction [Line Items]          
Revenue $ 51,859 $ 54,000 $ 107,510 $ 111,818  
Gross Margin 21,877 24,938 42,018 46,251  
Earnings Before Income Taxes 20,345 $ 23,910 38,849 $ 43,662  
Current Assets 67,861   67,861   $ 71,089
Non-Current Assets 67,679   67,679   66,856
Current Liabilities $ 18,191   $ 18,191   $ 20,671