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Valhi Stockholder's Equity - Schedule of Common Stock Outstanding (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Schedule Of Stockholders Equity [Line Items]        
Shares of common stock, Issued, beginning balance 355.2 355.2 355.2  
Shares of common stock, Issued, ending balance   355.2 355.2  
Shares of common stock, Treasury, beginning balance   (13.2) (13.2) (12.2)
Shares of common stock, Treasury, acquired (1.0)      
Shares of common stock, Outstanding, beginning balance 341.0 342.0 342.0  
Shares of common stock, Outstanding, ending balance   342.0 342.0