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Quarterly Financial Summary (Unaudited) (Footnote) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | [1] | Jun. 30, 2016 | Mar. 31, 2016 | [1] | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Gain (loss) on sales of businesses, net | $ 0 | [1] | $ 0 | $ 974 | [1] | $ 121,324 |  | $ 122,298 | $ 0 | $ 0
Net benefit from release of tax reserves |  |  |  |  |  |  | $ 43,100 |  | $ 42,700 | $ 2,500
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 |  |  |  |  |  |  |  |  |  |
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) |  |
[1] | Included in Gain on sales of businesses, net for the year ended December 31, 2016 is $11.5 million and $112.3 million related to the sales of the metal sulfides business and the minerals-based flame retardants and specialty chemicals business, respectively, both of which closed in the first quarter of 2016. In addition, Gain on sales of businesses, net for the year ended December 31, 2016 includes a loss of $1.5 million on the sale of our wafer reclaim business. See Note 3, “Divestitures,” for additional information.

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