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Amount of bad debt expenses recognized to fully reserve the intercompany accounts receivable balance with BWC related to BWC's bankruptcy filing.

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Business combinations, dispositions and related transactions - Additional Information (Details) $ in Millions		3 Months Ended		12 Months Ended
	Dec. 01, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2024 shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) item shares	Jul. 10, 2024 USD ($)	Dec. 31, 2021 shares
Business combinations, dispositions and related transactions
Fixed asset impairment \| $					$ 3.8
Loss on sale of Basic Power Company (BPC) \| $	$ 2.6
Basic Management Inc
Business combinations, dispositions and related transactions
Fixed asset impairment \| $			$ 16.4
Loss on deconsolidation of Basic Water Company ("BWC") \| $		$ 2.0
Bad debt expense recognized \| $		$ 1.3
Shares Repurchased from Affiliates
Business combinations, dispositions and related transactions
Number of affiliates \| item						2
Number of private transactions \| item						2
Kronos
Business combinations, dispositions and related transactions
Repurchase of common stock								2,000,000
Shares available for purchase				1,017,518
CompX International \| Class A
Business combinations, dispositions and related transactions
Common stock, Repurchased				0	0
Shares available for purchase				523,647
NL Industries
Business combinations, dispositions and related transactions
Common stock, Repurchased						2,000
Reorganization, Chapter 11, Debtor-in-Possession
Business combinations, dispositions and related transactions
Cash \| $							$ 2.6
Treasury stock \| Kronos
Business combinations, dispositions and related transactions
Common stock, Repurchased				0	313,814	217,778
Stock repurchase, aggregate purchase price \| $					$ 2.8	$ 2.5
Treasury stock \| CompX International \| Shares Repurchased in Market Transaction
Business combinations, dispositions and related transactions
Common stock, Repurchased						70,000
Treasury stock \| CompX International \| Shares Repurchased from Affiliates
Business combinations, dispositions and related transactions
Common stock, Repurchased						8,900
Treasury stock \| CompX International \| Class A
Business combinations, dispositions and related transactions
Common stock, Repurchased						78,900
Stock repurchase, aggregate purchase price \| $						$ 1.7