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Long term debt - Valhi Contran Credit Facility - Additional Information (Detail) (Contran [Member], Line of Credit [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Contran [Member] | Line of Credit [Member]
 
Line of Credit Facility [Line Items]  
Net repayments $ 8.6
Weighted average interest rate 4.25%
Amount available for Borrowing $ 76.0