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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, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Related Party Transaction [Line Items]          
Revenue $ 51,411 $ 51,311 $ 158,922 $ 163,128  
Gross Margin 20,178 23,421 62,196 69,672  
Earnings Before Income Taxes 19,013 $ 22,745 57,862 $ 66,407  
Current Assets 71,385   71,385   $ 71,089
Non-Current Assets 69,773   69,773   66,856
Current Liabilities $ 20,070   $ 20,070   $ 20,671