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Marketable Securities - Additional Information (Detail) - Valhi Inc - Common stock - $ / shares shares in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Marketable Securities [Line Items] |  |
Investments in publicly-traded shares | 144,000 | 144,000
Quoted market price of per share | $ 13.16 | $ 22.44
Reverse stock split description | 1-for-12 |

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