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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, 2017
USD ($)
Debt Instrument [Line Items]  
Credit facility, Amount borrowed $ 5.4
Debt instrument, Interest rate at period end 5.25%
Debt instrument, average interest rate during period 5.03%
Amount available for borrowing $ 40.7