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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 6 Months Ended
--- | --- | ---
May 28, 2020 | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares
Equity Class Of Treasury Stock [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 |
Kronos Worldwide, Inc. |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |
Common stock, Repurchased | shares |  | 122,489 | 110,303
Stock repurchase, aggregate purchase price | $ |  | $ 1.0 | $ 1.4
Shares available for purchase | shares |  | 1,600,000 |

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