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Related Party Transactions - Current Receivables and Payables to Affiliates (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current receivables from affiliates:    
Receivables from affiliates $ 313 $ 581
Current payables to affiliates:    
Payable to affiliates 725 801
Other - Trade Items    
Current receivables from affiliates:    
Receivables from affiliates 313 565
Current payables to affiliates:    
Payable to affiliates 696 801
Valhi    
Current payables to affiliates:    
Payable to affiliates $ 29  
Valhi | Income Taxes    
Current receivables from affiliates:    
Receivables from affiliates   $ 16