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Business Combinations, Dispositions and Related Transactions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Waste Management \| Discontinued Operations
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Pre-tax gain from disposal of discontinued operations	$ 4.9
Gain from disposal of discontinued operations, net of tax	$ 4.3
Kronos Worldwide, Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Repurchase of common stock					2,000,000.0
Repurchased shares			122,489	264,992
Shares available for purchase		1,549,110
Stock repurchase, aggregate purchase price			$ 1.0	$ 3.0
Shares acquired		14,409
Shares acquired, value		$ 0.2
CompX \| Class A
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Repurchased shares			0	0
Shares available for purchase		602,547
Shares acquired		75,000
Shares acquired, value		$ 1.3