Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 36,616	$ 41,675	$ 77,767	$ 83,725
Cost of sales	26,343	28,046	54,790	58,016
Income (loss) from operations	1,421	4,205	5,618	8,075
Income tax expense (benefit)	(7,300)	6,435	(5,879)	9,140
Net income (loss)	(3,108)	30,252	(9,824)	48,809
Kronos
Schedule Of Equity Method Investments [Line Items]
Net sales	443,200	565,300	869,500	1,128,200
Cost of sales	399,100	444,800	794,600	858,400
Income (loss) from operations	(6,700)	65,200	(25,000)	148,500
Income tax expense (benefit)	(4,100)	14,800	(11,000)	33,100
Net income (loss)	$ (8,200)	$ 45,900	$ (23,400)	$ 103,400