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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]    
Current assets $ 186,625 $ 171,164
Property and equipment, net 28,709 28,950
Other noncurrent assets 5,361 5,262
Total assets 575,347 548,150
Current liabilities 27,538 27,507
Accrued pension costs 5,525 6,392
Other 3,637 3,780
Stockholders' equity 336,301 311,877
Total liabilities and equity 575,347 548,150
Kronos    
Schedule Of Equity Method Investments [Line Items]    
Current assets 1,159,100 1,218,300
Property and equipment, net 509,500 524,600
Investment in TiO2 joint venture 103,500 103,300
Other noncurrent assets 184,800 190,500
Total assets 1,956,900 2,036,700
Current liabilities 201,800 260,200
Long-term debt 472,500 486,700
Accrued pension costs 359,000 372,600
Other 112,400 120,700
Stockholders' equity 811,200 796,500
Total liabilities and equity $ 1,956,900 $ 2,036,700