Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 41,675	$ 36,253	$ 83,725	$ 72,177
Cost of sales	28,046	24,947	58,016	49,836
Income from operations	4,205	2,887	8,075	6,859
Income tax expense	6,435	1,901	9,140	4,406
Net income	30,252	12,697	48,809	25,954
Kronos
Schedule Of Equity Method Investments [Line Items]
Net sales	565,300	478,600	1,128,200	943,600
Cost of sales	444,800	369,600	858,400	738,900
Income from operations	65,200	43,800	148,500	77,800
Income tax expense	14,800	9,200	33,100	15,200
Net income	$ 45,900	$ 25,700	$ 103,400	$ 45,300