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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) - VALHI, INC. - Contran Credit Facility
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Debt Instrument [Line Items]  
Net borrowings $ 24.9
Debt instrument, Interest rate at period end 4.25%
Debt instrument, average interest rate during period 4.25%
Amount available for borrowing $ 26.4