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Quarterly Financial Summary (Unaudited) (Footnote) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gain (loss) on sales of businesses, net | $ 0 | $ 0 | $ 974 | $ 121,324 | $ 0 | $ 122,298 | $ 0
Metal Sulfides Business |  |  |  |  |  |  |
Gain (loss) on sales of businesses, net |  |  |  |  |  | 11,500 |
Mineral Flame Retardants and Specialty Chemicals Businesses |  |  |  |  |  |  |
Gain (loss) on sales of businesses, net |  |  |  |  |  | 112,300 |
Chemetall Surface Treatment |  |  |  |  |  |  |
Gain (loss) on sales of businesses, net |  |  |  |  | $ 257,000 |  |
Discrete non-cash charge |  |  | $ 416,700 |  |  |  |
Gain on sale of business, net of tax | $ 135,000 |  |  |  |  |  |
Corporate | Wafer Reclaim |  |  |  |  |  |  |
Gain (loss) on sales of businesses, net |  |  |  |  |  | $ (1,500) |

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