Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 40,355	$ 42,864	$ 118,122	$ 126,589
Cost of sales	27,736	30,928	82,526	88,944
Income (loss) from operations	3,681	3,216	9,299	11,291
Income tax expense (benefit)	(965)	(5,576)	(6,844)	3,564
Net income (loss)	(69)	(8,904)	(9,893)	39,905
Kronos
Schedule Of Equity Method Investments [Line Items]
Net sales	396,900	459,600	1,266,400	1,587,800
Cost of sales	362,500	375,600	1,157,100	1,234,000
Income (loss) from operations	(25,300)	30,800	(50,300)	179,300
Income tax expense (benefit)	(8,700)	1,200	(19,700)	34,300
Net income (loss)	$ (20,400)	$ 21,000	$ (43,800)	$ 124,400