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Long-Term Debt - Kronos Senior Secured Notes - Additional Information (Detail) - Kronos Worldwide, Inc. - 3.75% Senior Secured Notes due September 15, 2025 - Kronos International, Inc $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€)
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 3.75% | 3.75%
Debt instrument maturity date | Sep. 15, 2025 |
Debt instrument principal amount | € |  | € 400,000,000
Unamortized debt issuance costs | $ | $ 6.7 |

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