Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 227,357	$ 218,264
Property and equipment, net	24,737	25,863
Other noncurrent assets	5,721	2,060
Total assets	580,026	576,662
Current liabilities	29,561	30,449
Accrued pension costs	1,249	1,571
Other noncurrent liabilities	5,067	5,074
Stockholders' equity	373,092	369,812
Total liabilities and equity	580,026	576,662
Kronos | Reportable Legal Entities
Schedule Of Equity Method Investments [Line Items]
Current assets	987,200	1,117,400
Property and equipment, net	444,300	482,900
Investment in TiO2 joint venture	101,200	111,000
Other noncurrent assets	124,200	126,700
Total assets	1,656,900	1,838,000
Current liabilities	273,100	370,800
Long-term debt	423,700	440,900
Accrued pension costs	140,100	150,000
Other noncurrent liabilities	45,400	68,000
Stockholders' equity	774,600	808,300
Total liabilities and equity	$ 1,656,900	$ 1,838,000