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Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Related Party Transaction [Line Items]      
Revenues $ 49,776 $ 54,022  
Gross Margin 17,337 17,012  
Earnings Before Income Taxes 16,138 $ 15,660  
Current Assets 69,965   $ 70,491
Non-Current Assets 41,032   41,464
Current Liabilities $ 16,399   $ 15,964