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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) - Jun. 30, 2015 - VALHI, INC. - Contran Credit Facility - USD ($)
$ in Millions
Total
Debt Instrument [Line Items]  
Net borrowings $ 13.5
Debt instrument, Interest rate at period end 4.25%
Debt instrument, average interest rate during period 4.25%
Amount available for borrowing $ 37.8