Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 237,958	$ 218,264
Property and equipment, net	24,026	25,863
Other noncurrent assets	1,034	2,060
Total assets	578,258	576,662
Current liabilities	91,062	30,449
Accrued pension costs	76	1,571
Other noncurrent liabilities	6,183	5,074
Stockholders' equity	396,904	369,812
Total liabilities and equity	578,258	576,662
Kronos | Reportable Legal Entities
Schedule Of Equity Method Investments [Line Items]
Current assets	1,105,300	1,117,400
Property and equipment, net	694,100	482,900
Investment in TiO2 joint venture		111,000
Other noncurrent assets	114,100	126,700
Total assets	1,913,500	1,838,000
Current liabilities	476,600	370,800
Long-term debt	429,100	440,900
Accrued pension costs	117,500	150,000
Other noncurrent liabilities	73,300	68,000
Stockholders' equity	817,000	808,300
Total liabilities and equity	$ 1,913,500	$ 1,838,000