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Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,660,975 $ 1,599,992
Accumulated Depreciation (676,924) (614,268)
Property, Plant and Equipment, Net 984,051 985,724
Land And Quarries [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 171,987 154,710
Plants [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,357,594 1,324,489
Buildings Machinery And Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 111,263 110,138
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 20,131 $ 10,655