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Marketable Securities (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 1 Months Ended
May 31, 2011
Aug. 03, 2012
TIMET Common Stock [Member]
Jun. 30, 2012
TIMET Common Stock [Member]
Dec. 31, 2011
TIMET Common Stock [Member]
May 31, 2012
Valhi Common Stock [Member]
Jun. 30, 2012
Valhi Common Stock [Member]
Dec. 31, 2011
Valhi Common Stock [Member]
Marketable Securities (Textual) [Abstract]              
Outstanding common stock       4.2   1.7  
Percentage of common stock outstanding       2.40%      
Quoted market price in excess of cost basis   $ 22.4          
Quoted market price of per share     $ 11.31 $ 14.98   $ 12.49 $ 20.16
Stock split conversion ratio 2       3