Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle).

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+ Details

Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Note receivable from affiliate		$ 37,600,000		$ 37,600,000		$ 38,200,000
Unsecured Revolving Demand Promissory \| Valhi Inc
Related Party Transaction [Line Items]
Maximum loan amount	$ 40,000,000
Interest rate on loans repayment	1.00%
Principal due on demand effective date	Dec. 31, 2019
Note receivable from affiliate		37,600,000		37,600,000
Interest income including unused commitment fees on our loan		$ 400,000	$ 500,000	$ 800,000	$ 1,000,000