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Marketable Securities - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items] |  |  |
Pre-tax other than temporary impairment charge to write down | $ 12.0 |  |
Valhi Inc |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Pre-tax other than temporary impairment charge to write down | $ 12.0 |  |
Valhi Inc | Common stock |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Investments in publicly-traded shares | 1.7 | 1.7 | 1.7
Quoted market price of per share |  | $ 3.46 | $ 1.34

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