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Long-Term Debt - Valhi - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Notes Payable, Other Payables | Snake River |  |
Debt Instrument [Line Items] |  |
Term loan | $ 250.0 |
Loans bear interest at a weighted average fixed interest rate | 9.40% |
Loans maturity period | Jan. 31, 2027 |
Recourse loans | 37.5 |
Nonrecourse loans | 212.5 |
Line of Credit | Contran |  |
Debt Instrument [Line Items] |  |
Borrowing availability | 275.0 |
Debt instrument, Interest rate at period end | 4.25% |
Debt due date, start date | Dec. 31, 2015 |
Credit facility, Amount borrowed | 48.9 | 157.6
Amount available for borrowing | $ 68.5 |
Debt instrument, Variable rate spread | 1.00% |

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