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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]        
Other Receivable, after Allowance for Credit Loss, Noncurrent $ 10,600 $ 13,200    
Interest income 4,168 1,877 $ 1,197  
Related Party [Member] | Tall Pines Insurance Company or EWI RE Inc        
Related Party Transaction [Line Items]        
Related party transaction expense 3,400 3,300 2,900  
Related Party [Member] | Intercorporate Services Agreements Fees | Contran Corporation [Member]        
Related Party Transaction [Line Items]        
Related party transaction expense 3,100 3,400 3,400  
Related Party [Member] | Policies Written by Tall Pines Insurance Company | Tall Pines Insurance Company or EWI RE Inc        
Related Party Transaction [Line Items]        
Related party transaction expense 1,100 1,000 900  
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, 2025
Unsecured Revolving Demand Promissory | Related Party [Member] | Valhi Inc        
Related Party Transaction [Line Items]        
Other Receivable, after Allowance for Credit Loss, Noncurrent 10,600 13,200    
Interest income $ 1,200 $ 1,000 $ 1,200