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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related party transactions:
Note receivable from affiliate		$ 8,100		$ 8,100		$ 9,300
Interest income		800	$ 1,235	2,519	$ 3,754
Unsecured Revolving Demand Promissory | Valhi Inc
Related party transactions:
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 transactions:
Note receivable from affiliate		$ 8,100		8,100
Interest income				$ 700	$ 800

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