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Valhi Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2019
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |  |
Treasury stock, shares | 1,100,000 | 1,100,000 | 1,100,000 |  |
Percentage of shares held by majority-owned subsidiary that has to be considered for voting purpose | 100.00% |  |  |  |
Preferred stock, par value | $ 0.01 | $ 0.01 |  |  |
Director Stock Plan |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Number of shares authorized |  |  |  | 100,000 | 200,000
Shares awarded under plan | 9,000 | 2,400 |  |  |
Common stock available for future grant | 84,600 |  |  |  |
N L Industries Inc |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Treasury stock, shares | 1,200,000 | 1,200,000 |  |  |
Unrealized gain (loss) on sale of shares attributable to noncontrolling interest |  | $ 1.6 | $ 3.3 |  |
N L Industries Inc | Director Stock Plan |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Common stock available for future grant | 200,000 |  |  |  |
Kronos |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Shares available for purchase | 1,017,518 |  |  |  |
Treasury stock, shares | 100,000 | 100,000 |  |  |
Unrealized gain (loss) on sale of shares attributable to noncontrolling interest | $ 1.7 | $ 1.6 | $ 3.3 |  |
Kronos | Director Stock Plan |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Common stock available for future grant | 97,100 |  |  |  |
Comp X | Director Stock Plan |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Common stock available for future grant | 124,450 |  |  |  |
Common Stock |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Shares available for purchase | 334,000 |  |  |  | 833,333

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