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Valhi Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 10, 2020 $ / shares shares | May 28, 2020 | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) $ / shares shares | Jun. 30, 2020 shares | Dec. 31, 2012 shares
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Reverse stock split, description |  | Reverse stock split. On May 28, 2020 following stockholder approval at our annual meeting, our board of directors approved a reverse stock split of our common stock at a ratio of 1-for-12, which was effective on June 1, 2020. |  |  |  |  |  |
Reverse stock split, conversion ratio |  | 12 |  |  |  |  |  |
Reclassification from common stock to additional paid-in capital | $ |  |  | $ 3.3 |  |  |  |  |
Common stock, par value | $ / shares |  |  | $ 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 | $ / shares |  |  | $ 0.01 | $ 0.01 |  |  |  |
Director Plan |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  | 200,000
Shares awarded under new plan |  |  | 50,000 | 50,000 | 14,500 |  |  |
Common stock available for future grant |  |  | 24,000 |  |  |  |  |
Contran |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares | $ 0.01 |  |  |  |  |  |  |
Non-cumulative dividend on preferred stock | 6.00% |  |  |  |  |  |  |
Preferred stock returned to contribution agreement authorized designated | 5,000 |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  | 5,000 |  |
Preferred stock liquidation preference, per share | $ / shares |  |  |  |  |  | $ 133,466.75 |  |
Preferred stock, aggregate liquidation preference | $ |  |  |  |  |  | $ 667.3 |  |
Preferred stock, par value | $ / shares |  |  |  |  |  | $ 0.01 |  |
Non-cumulative dividend on preferred stock |  |  |  |  |  | 6.00% |  |
NL |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares |  |  | 1,200,000 | 1,200,000 |  |  |  |
Unrealized losses of shares attributable to noncontrolling interest | $ |  |  | $ 1.7 | $ 0.2 | $ 12.2 |  |  |
NL | Director Plan |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock available for future grant |  |  | 79,900 |  |  |  |  |
Kronos Worldwide, Inc. |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Shares available for purchase |  |  | 1,560,000 |  |  |  |  |
Treasury stock, shares |  |  | 100,000 | 100,000 |  |  |  |
Unrealized losses of shares attributable to noncontrolling interest | $ |  |  | $ 1.7 | $ 0.2 | $ 12.2 |  |  |
Kronos Worldwide, Inc. | Director Plan |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock available for future grant |  |  | 127,400 |  |  |  |  |
CompX | Director Plan |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock available for future grant |  |  | 149,050 |  |  |  |  |
Common stock |  |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Shares available for purchase |  |  | 334,000 |  |  |  | 833,333 |

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