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Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Inventory [Line Items]    
Inventories $ 222,783 $ 243,595
Raw Materials and Material-in-Progress [Member]    
Inventory [Line Items]    
Inventories 104,173 119,060
Finished Cement [Member]    
Inventory [Line Items]    
Inventories 18,963 21,834
Gypsum Wallboard [Member]    
Inventory [Line Items]    
Inventories 6,944 5,839
Frac Sand [Member]    
Inventory [Line Items]    
Inventories 3,847 5,501
Aggregates [Member]    
Inventory [Line Items]    
Inventories 7,510 10,660
Paperboard [Member]    
Inventory [Line Items]    
Inventories 4,818 7,575
Repair Parts and Supplies [Member]    
Inventory [Line Items]    
Inventories 70,986 68,155
Fuel and Coal [Member]    
Inventory [Line Items]    
Inventories $ 5,542 $ 4,971