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Business combinations and related transactions (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) item shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 shares
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Loss on sale of Basic Power Company (BPC) | $		$ 2.6
Shares Repurchased from Affiliates
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Number of affiliates | item	2
Number of private transactions | item	2
Kronos Worldwide, Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Repurchase of common stock					2,000,000.0
Shares available for purchase		1,017,518
CompX International Inc. | Class A Common [Member]
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Common stock, Repurchased		0
Shares available for purchase		523,647
NL Industries, Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Common stock, Repurchased	2,000
Treasury stock | Kronos Worldwide, Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Common stock, Repurchased		313,814	217,778	14,409
Stock repurchase, aggregate purchase price | $		$ 2.8	$ 2.5	$ 0.2
Treasury stock | CompX International Inc. | Shares Repurchased in Market Transaction
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Common stock, Repurchased	70,000
Treasury stock | CompX International Inc. | Shares Repurchased from Affiliates
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Common stock, Repurchased	8,900
Treasury stock | CompX International Inc. | Class A Common [Member]
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Common stock, Repurchased	78,900			75,000
Stock repurchase, aggregate purchase price | $	$ 1.7			$ 1.3

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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