Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 225,577	$ 218,264
Property and equipment, net	24,261	25,863
Other noncurrent assets	701	2,060
Total assets	585,650	576,662
Current liabilities	33,566	30,449
Accrued pension costs	624	1,571
Other noncurrent liabilities	5,083	5,074
Stockholders' equity	386,037	369,812
Total liabilities and equity	585,650	576,662
Kronos | Reportable Legal Entities
Schedule Of Equity Method Investments [Line Items]
Current assets	1,067,800	1,117,400
Property and equipment, net	720,900	482,900
Investment in TiO2 joint venture		111,000
Other noncurrent assets	132,900	126,700
Total assets	1,921,600	1,838,000
Current liabilities	398,300	370,800
Long-term debt	470,400	440,900
Accrued pension costs	144,200	150,000
Other noncurrent liabilities	61,300	68,000
Stockholders' equity	847,400	808,300
Total liabilities and equity	$ 1,921,600	$ 1,838,000