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Long-term debt - Valhi Contran Credit Facility - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Debt Instrument [Line Items] |  |
Repayments of credit facility | $ 123.9 | $ 0.0
VALHI, INC. | Contran Credit Facility |  |
Debt Instrument [Line Items] |  |
Borrowings | 0.0 |
Repayments of credit facility | $ 48.3 |
Debt instrument, interest rate during period | 9.48% |
Debt instrument, Interest rate at period end | 9.00% |
Amount available for borrowing | $ 104.9 |

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