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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 30, 2016
Nov. 14, 2016
Related Party Transaction [Line Items]          
Notes receivable from affiliate $ 18,700 $ 29,500      
Contran | Kronos          
Related Party Transaction [Line Items]          
Rent and related ancillary service 400 400 $ 100    
Contran | Intercorporate Services Agreement Fees          
Related Party Transaction [Line Items]          
Expense transaction with affiliate 33,200 33,400 36,100    
Contran | Combined Information Technology Data Recovery Program | Kronos          
Related Party Transaction [Line Items]          
Expense transaction with affiliate 300 300 200    
Tall Pines and EWI | Insurance Premiums          
Related Party Transaction [Line Items]          
Expense transaction with affiliate 26,300 22,200 14,900    
Tall Pines          
Related Party Transaction [Line Items]          
Expense transaction with affiliate 19,500 15,600      
NLKW Holding, LLC | Valhi | Valhi Credit Facility          
Related Party Transaction [Line Items]          
Borrowing under credit facility       $ 50,000 $ 50,000
Outstanding borrowings 500 500      
CompX | Valhi Inc | Unsecured Revolving Promissory Note Receivable          
Related Party Transaction [Line Items]          
Maximum loan amount $ 30,000        
Interest rate on loans repayment 1.00%        
Notes receivable from affiliate $ 18,700 29,500      
Interest income including unused commitment fees $ 1,200 $ 1,500 $ 2,400