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Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Income (loss) of Subsidiaries (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Noncontrolling interest in net income of subsidiaries:      
Noncontrolling interest in net income of subsidiaries: $ 62.3 $ 77.5 $ 13.5
Kronos Worldwide, Inc. [Member]
      
Noncontrolling interest in net income of subsidiaries:      
Noncontrolling interest in net income of subsidiaries: 42.6 62.6 9.8
NL [Member]
      
Noncontrolling interest in net income of subsidiaries:      
Noncontrolling interest in net income of subsidiaries: 15.2 13.9 3.3
CompX [Member]
      
Noncontrolling interest in net income of subsidiaries:      
Noncontrolling interest in net income of subsidiaries: $ 4.5 $ 1.0 $ 0.4