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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Balance at the beginning of the period $ 284,523,000  
Equity in earnings of Kronos 4,343,000 (12,487,000)
Dividends received from Kronos (5,283,000) (5,283,000)
Other, principally equity in Kronos’ other comprehensive loss (3,400,000)  
Balance at the end of the period $ 280,130,000