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Segment Breakdown of Goodwill (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Goodwill $ 133,885 $ 132,515
Cement [Member]    
Segment Reporting Information [Line Items]    
Goodwill 9,729 8,359
Gypsum Wallboard [Member]    
Segment Reporting Information [Line Items]    
Goodwill 116,618 116,618
Paperboard [Member]    
Segment Reporting Information [Line Items]    
Goodwill $ 7,538 $ 7,538