Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 35,887	$ 36,616	$ 73,858	$ 77,767
Cost of sales	24,722	26,343	53,026	54,790
Income (loss) from operations	791	1,421	2,147	5,618
Income tax expense (benefit)	1,302	(7,300)	2,290	(5,879)
Net income (loss)	7,835	(3,108)	14,674	(9,824)
Kronos | Reportable Legal Entities
Schedule Of Equity Method Investments [Line Items]
Net sales	500,500	443,200	979,300	869,500
Cost of sales	400,300	399,100	807,600	794,600
Income (loss) from operations	35,900	(6,700)	55,400	(25,000)
Income tax expense (benefit)	8,500	(4,100)	12,000	(11,000)
Net income (loss)	$ 19,500	$ (8,200)	$ 27,600	$ (23,400)