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Marketable Securities - Additional Information (Detail) - Valhi Inc - Common stock - $ / shares | Dec. 31, 2023 | Dec. 31, 2022
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Marketable securities |  |
Investments in publicly-traded shares (in shares) | 144,000 | 144,000
Quoted market price of per share (in dollars per share) | $ 15.19 | $ 22.00

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