Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 88,478,000	$ 112,653,000
Property and equipment, net	34,290,000	34,329,000
Investment in TiO2 joint venture	280,100,000	323,128,000
Other noncurrent assets	2,345,000	3,854,000
Total assets	719,253,000	680,782,000
Current liabilities	22,402,000	24,785,000
Long-term debt		17,480,000
Other noncurrent liabilities	18,372,000	18,572,000
Stockholders’ equity	407,316,000	374,815,000
Total liabilities and stockholders’ equity	719,253,000	680,782,000
Kronos
Schedule Of Equity Method Investments [Line Items]
Current assets	821,500,000	1,223,400,000
Property and equipment, net	524,000,000	522,500,000
Investment in TiO2 joint venture	105,900,000	109,900,000
Other noncurrent assets	222,400,000	171,200,000
Total assets	1,673,800,000	2,027,000,000
Current liabilities	297,400,000	328,400,000
Long-term debt	203,300,000	378,900,000
Accrued pension and postretirement benefits	198,400,000	203,300,000
Other noncurrent liabilities	54,200,000	54,300,000
Stockholders’ equity	920,500,000	1,062,100,000
Total liabilities and stockholders’ equity	$ 1,673,800,000	$ 2,027,000,000