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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]    
Current assets $ 171,164 $ 164,684
Property and equipment, net 28,950 31,015
Other noncurrent assets 5,262 5,860
Total assets 548,150 557,492
Current liabilities 27,507 29,808
Accrued pension costs 6,392 8,230
Other noncurrent liabilities 3,780 6,260
Stockholders' equity 311,877 304,506
Total liabilities and equity 548,150 557,492
Kronos    
Schedule Of Equity Method Investments [Line Items]    
Current assets 1,218,300 1,219,700
Property and equipment, net 524,600 490,600
Investment in TiO2 joint venture 103,300 90,200
Other noncurrent assets 190,500 165,300
Total assets 2,036,700 1,965,800
Current liabilities 260,200 270,600
Long-term debt 486,700 444,000
Accrued pension costs 372,600 307,400
Other noncurrent liabilities 120,700 127,700
Stockholders' equity 796,500 816,100
Total liabilities and equity $ 2,036,700 $ 1,965,800