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Business Combination,Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Geographic Operating Segment - Summary of Combined Statement of Operations Information of the Net Assets Sold (Detail) - Eagle Materials Inc And Grupo Cementos de Chihuahua SAB De C.V. [member] - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Discontinued Operations And Disposal Groups [Line Items] |  |  |
Net sales | $ 86 | $ 3,322 | $ 3,538
Operating costs and expenses | (71) | (2,800) | (2,795)
Operating earnings before other expenses, net | $ 15 | $ 522 | $ 743

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- Details
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