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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Note receivable from affiliate		$ 8,900		$ 8,900		$ 9,300
Interest income		846	$ 1,295	1,719	$ 2,519
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		$ 8,900		8,900
Interest income				$ 400	$ 500

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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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-Topic 946
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-Name Accounting Standards Codification
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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
-Topic 310
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