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Long-Term Debt - Valhi - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Aug. 31, 2018 | Jan. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Outstanding debt obligations | $ 800,400,000 |  |  | $ 1,043,100,000
Contran Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repaid amount | 6,300,000 |  |  |
Contran Credit Facility | Waste Management |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Noncash borrowings |  |  | $ 36,300,000 |
VALHI, INC. |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt obligations | 314,300,000 |  |  | 534,300,000
VALHI, INC. | Contran Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt obligations | 314,300,000 |  |  | $ 284,300,000
Maximum borrowing capacity | $ 360,000,000 |  |  |
Debt instrument, Interest rate at period end | 6.50% |  |  |
Debt due date, start date | Dec. 31, 2020 |  |  |
Amount available for borrowing | $ 45,700,000 |  |  |
Debt instrument basis spread on variable rate | 1.00% |  |  |
Debt instrument, average interest rate during period | 5.90% |  |  |
VALHI, INC. | Snake River |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt obligations |  | $ 250,000,000 |  |
Weighted average fixed interest rate |  | 9.40% |  |
WCS | Contran Credit Facility | Contran | Amounts Acquired in Business Divestiture |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Acquired trade receivable |  |  | $ 36,300,000 |

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