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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance sheet (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Current assets $ 107,511,000 $ 112,653,000
Property and equipment, net 33,968,000 34,329,000
Investment in TiO2joint venture 298,955,000 323,128,000
Other noncurrent assets 2,255,000 3,854,000
Total assets 700,531,000 680,782,000
Current liabilities 19,973,000 24,785,000
Long-term debt 17,230,000 17,480,000
Other noncurrent liabilities 18,522,000 18,572,000
Stockholders' equity 395,683,000 374,815,000
Total liabilities and equity 700,531,000 680,782,000
Kronos [Member]
    
Schedule of Equity Method Investments [Line Items]    
Current assets 1,035,500,000 1,223,400,000
Property and equipment, net 503,200,000 522,500,000
Investment in TiO2joint venture 100,100,000 109,900,000
Other noncurrent assets 221,500,000 171,200,000
Total assets 1,860,300,000 2,027,000,000
Current liabilities 329,800,000 328,400,000
Long-term debt 278,600,000 378,900,000
Accrued pension and postretirement benefits 195,500,000 203,300,000
Other noncurrent liabilities 73,900,000 54,300,000
Stockholders' equity 982,500,000 1,062,100,000
Total liabilities and equity $ 1,860,300,000 $ 2,027,000,000