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Related Party Transactions - Current Receivables and Payables to Affiliates (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current receivables from affiliates:    
Receivables from affiliates $ 581 $ 792
Current payables to affiliates:    
Payable to affiliates 801 567
Other - Trade Items    
Current receivables from affiliates:    
Receivables from affiliates 565 543
Current payables to affiliates:    
Payable to affiliates 801 567
Valhi | Income Taxes    
Current receivables from affiliates:    
Receivables from affiliates $ 16 $ 249