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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 10, 2020 $ / shares shares | May 28, 2020 | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($) $ / shares 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 |  |  | 122,489 | 264,992 |
Stock repurchase, aggregate purchase price | $ |  |  | $ 1.0 | $ 3.0 |
Common stock , shares cancelled |  |  |  | 110,303 |
Common stock, cancelled | $ |  |  |  | $ 1.4 |
Shares available for purchase |  |  | 1,600,000 |  |
Contran |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Preferred stock, par value | $ / shares | $ 0.01 |  |  |  |
Non-cumulative dividend on preferred stock | 600.00% |  |  |  |
Preferred stock returned to contribution agreement authorized designated | 5,000 |  |  |  |
Series A Preferred Stock |  |  |  |  |
Equity Class Of Treasury Stock [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%

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