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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) (Contran, Line of Credit, USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Contran | Line of Credit
 
Line Of Credit Facility [Line Items]  
Net borrowings $ 15.9
Percentage of average interest rate 4.25%
Percentage of average interest rate, during period 4.25%
Amount available for borrowing $ 51.5