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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Related Party Transaction [Line Items]          
Revenues $ 55,558 $ 59,071 $ 105,334 $ 113,094  
Gross Margin 25,588 25,193 42,925 42,204  
Earnings Before Income Taxes 24,294 $ 23,360 40,254 $ 39,020  
Current Assets 69,699   69,699   $ 70,491
Non-Current Assets 39,969   39,969   41,464
Current Liabilities $ 16,649   $ 16,649   $ 15,964