Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Balance at the beginning of the period	$ 292,206
Equity in earnings (loss) of Kronos	(15,003)	$ 31,873	$ 34,323
Dividends received from Kronos	(26,766)	(26,766)	(25,356)
Equity in Kronos' other comprehensive income (loss):
Balance at the end of the period	247,582	292,206
Defined Benefit Pension Plans
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans	(5,728)	(734)	(56)
Kronos
Schedule Of Equity Method Investments [Line Items]
Balance at the beginning of the period	292,200	264,800	242,400
Equity in earnings (loss) of Kronos	(15,000)	31,900	34,300
Dividends received from Kronos	(26,800)	(26,800)	(25,400)
Equity in Kronos' other comprehensive income (loss):
Currency translation	1,100	(8,800)	(2,100)
Other	100	200
Balance at the end of the period	247,600	292,200	264,800
Kronos | Defined Benefit Pension Plans
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans	(3,900)	$ 30,900	$ 15,600
Kronos | OPEB
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans	$ (100)