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Long-term debt - Additional Information (Detail) - NLKW Holding, LLC - USD ($)
shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2016
Dec. 31, 2024
Dec. 31, 2023
Kronos      
Debt Instrument [Line Items]      
Asset contribution, equity security shares 35.2    
Back-To-Back Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing under credit facility $ 50.0    
Percentage of membership interest in subsidiary 100.00%    
Valhi | Valhi Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing under credit facility $ 50.0    
Line of credit facility frequency of payment of interest   quarterly  
Maximum principle outstanding, percentage of collateral value 50.00%    
Debt instrument collateral   100% of the membership interest in NLKW held by us  
Percentage of membership interest in subsidiary 100.00%    
Outstanding borrowing   $ 0.5 $ 0.5
Variable rate basis spread above reference rate 1.875%    
Debt instrument interest rate   9.40%  
Average interest rate   10.20%  
Valhi | Stock Repurchase Rights [Member] | Valhi Credit Facility      
Debt Instrument [Line Items]      
Stock repurchase, maximum debt percentage 50.00%    
Debt instrument maturity period 5 years    
Variable rate basis spread above reference rate 2.75%