Related Party Transactions - Current Receivables and Payables to Affiliates (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current receivables from affiliates:
Receivable from affiliate	$ 792	$ 1,767
Current payables to affiliates:
Payable to affiliates	567	429
Other - Trade Items
Current receivables from affiliates:
Receivable from affiliate	543
Current payables to affiliates:
Payable to affiliates	567	429
Valhi | Income Taxes
Current receivables from affiliates:
Receivable from affiliate	$ 249	$ 1,767