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Net Sales and Operating Earningsof Fairborn Proppants (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]    
Revenues $ 366,121 $ 297,504
Operating Earnings 96,692 $ 81,010
Fairborn Acquisition [Member]    
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]    
Revenues 22,155  
Operating Earnings $ 5,978