Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 41,151	$ 42,050
Cost of sales	28,447	29,970
Income from operations	4,197	3,870
Income tax expense (benefit)	1,421	2,705
Net income	(6,716)	18,557
Kronos
Schedule Of Equity Method Investments [Line Items]
Net sales	426,300	562,900
Cost of sales	395,500	413,600
Income from operations	(18,300)	83,300
Income tax expense (benefit)	(6,900)	18,300
Net income	$ (15,200)	$ 57,500