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 |