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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) - Contran Credit Facility - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Jan. 26, 2018
Waste Management |  |
Debt Instrument [Line Items] |  |
Noncash borrowings | $ 36.3 | $ 36.3
VALHI, INC. |  |
Debt Instrument [Line Items] |  |
Debt instrument, Interest rate at period end | 5.75% |
Debt instrument, average interest rate during period | 5.53% |
Amount available for borrowing | $ 39.4 |
WCS | Contran | Amounts Acquired in Business Divestiture |  |
Debt Instrument [Line Items] |  |
Acquired trade receivable | $ 36.3 | $ 36.3

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