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Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Aug. 31, 2016	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Note receivable from affiliate		$ 40,000,000		$ 34,000,000
Unsecured Revolving Demand Promissory | Valhi Inc
Related Party Transaction [Line Items]
Maximum loan amount	$ 40,000,000
Interest rate on loans repayment	1.00%	6.50%
Principal due on demand effective date	Dec. 31, 2020
Note receivable from affiliate		$ 40,000,000
Interest income including unused commitment fees on our loan		$ 1,200,000	$ 1,000,000

X

- Definition

Maximum lending capacity under the terms noted per the related party credit facility.

+ References

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- Definition

Loans receivable principal due on demand effective date.

+ References

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- Definition

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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- Definition

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

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- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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