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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Aug. 31, 2016	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Note receivable from affiliate		$ 9,300		$ 9,300
Interest income		873	$ 1,224
Unsecured Revolving Demand Promissory | Valhi Inc
Related Party Transaction [Line Items]
Maximum loan amount	$ 25,000
Interest rate on loans repayment	1.00%
Principal due on demand effective date	Dec. 31, 2026
Unsecured Revolving Demand Promissory | Related Party | Valhi Inc
Related Party Transaction [Line Items]
Note receivable from affiliate		9,300
Interest income		$ 200	$ 300

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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