Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Balance at the beginning of the period	$ 264,803
Equity in earnings of Kronos Worldwide, Inc.	31,873	$ 34,323	$ 19,437
Dividends received from Kronos	(26,766)	(25,356)	(25,356)
Equity in Kronos' other comprehensive income (loss):
Balance at the end of the period	292,206	264,803
Defined Benefit Pension Plans
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans	(734)	(56)	(478)
Kronos
Balance at the beginning of the period	264,800	242,400	248,400
Equity in earnings of Kronos Worldwide, Inc.	31,900	34,300	19,400
Dividends received from Kronos	(26,800)	(25,400)	(25,400)
Equity in Kronos' other comprehensive income (loss):
Currency translation	(8,800)	(2,100)	4,100
Other	200		(300)
Balance at the end of the period	292,200	264,800	242,400
Kronos | Defined Benefit Pension Plans
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans	$ 30,900	$ 15,600	(3,700)
Kronos | OPEB
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans			$ (100)