Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 218,302	$ 218,264
Property and equipment, net	25,184	25,863
Other noncurrent assets	3,504	2,060
Total assets	568,816	576,662
Current liabilities	24,602	30,449
Accrued pension costs	1,584	1,571
Other noncurrent liabilities	5,045	5,074
Stockholders' equity	368,126	369,812
Total liabilities and equity	568,816	576,662
Kronos | Reportable Legal Entities
Schedule Of Equity Method Investments [Line Items]
Current assets	984,700	1,117,400
Property and equipment, net	461,600	482,900
Investment in TiO2 joint venture	108,700	111,000
Other noncurrent assets	124,400	126,700
Total assets	1,679,400	1,838,000
Current liabilities	267,900	370,800
Long-term debt	426,900	440,900
Accrued pension costs	143,600	150,000
Other noncurrent liabilities	66,600	68,000
Stockholders' equity	774,400	808,300
Total liabilities and equity	$ 1,679,400	$ 1,838,000