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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Balance at the beginning of the period $ 323,128,000  
Equity in loss of Kronos 12,487,000 (41,612,000)
Dividends received from Kronos (5,283,000) (5,283,000)
Balance at the end of the period 298,955,000  
Investment in Kronos Worldwide, Inc. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Balance at the beginning of the period 323,100,000  
Equity in loss of Kronos (12,500,000)  
Dividends received from Kronos (5,300,000)  
Other, principally equity in Kronos' other comprehensive loss (6,300,000)  
Balance at the end of the period $ 299,000,000