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Long-Term Debt - Valhi - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jan. 31, 2018
Contran Credit Facility |  |
Debt Instrument [Line Items] |  |
Amount available for borrowing | $ 39,400,000 |
Contran Credit Facility | Waste Management | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Noncash borrowings |  | $ 36,300,000
VALHI, INC. | Contran Credit Facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 360,000,000 |
Debt instrument, Interest rate at period end | 5.50% |
Debt due date, start date | Dec. 31, 2019 |
Credit facility, Amount borrowed | $ 5,400,000 |
Amount available for borrowing | $ 75,700,000 |
Debt instrument basis spread on variable rate | 1.00% |
Debt instrument, average interest rate during period | 5.10% |
VALHI, INC. | Notes Payable, Other Payables | Snake River |  |
Debt Instrument [Line Items] |  |
Term loan | $ 250,000,000 |
Loans bear interest at a weighted average fixed interest rate | 9.40% |
Debt instrument maturity date | Jan. 31, 2027 |
Recourse loans | $ 37,500,000 |
Nonrecourse loans | $ 212,500,000 |
WCS | Subsequent Event | Contran | Amounts Acquired in Business Divestiture |  |
Debt Instrument [Line Items] |  |
Acquired trade receivable |  | $ 36,300,000

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