Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 33,667	$ 40,355	$ 107,525	$ 118,122
Cost of sales	24,199	27,736	77,225	82,526
Income (loss) from operations	2,036	3,681	4,183	9,299
Income tax expense (benefit)	8,508	(965)	10,798	(6,844)
Net income (loss)	36,010	(69)	50,684	(9,893)
Kronos | Reportable Legal Entities
Schedule Of Equity Method Investments [Line Items]
Net sales	484,700	396,900	1,464,000	1,266,400
Cost of sales	383,500	362,500	1,191,100	1,157,100
Income (loss) from operations	38,900	(25,300)	94,300	(50,300)
Income tax expense (benefit)	22,700	(8,700)	34,700	(19,700)
Net income (loss)	$ 71,800	$ (20,400)	$ 99,400	$ (43,800)