Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 42,864	$ 34,556	$ 126,589	$ 106,733
Cost of sales	30,928	23,634	88,944	73,470
Income from operations	3,216	2,284	11,291	9,143
Income tax expense (benefit)	(5,576)	1,054	3,564	5,460
Net income	(8,904)	10,313	39,905	36,267
Kronos
Schedule Of Equity Method Investments [Line Items]
Net sales	459,600	499,800	1,587,800	1,443,400
Cost of sales	375,600	376,800	1,234,000	1,115,700
Income from operations	30,800	57,300	179,300	135,100
Income tax expense (benefit)	1,200	12,100	34,300	27,300
Net income	$ 21,000	$ 36,000	$ 124,400	$ 81,300