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Related Party Transactions - Additional Information (Detail) - USD ($)		12 Months Ended
	Aug. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Related Party Transaction [Line Items]
Note receivable from affiliate		$ 34,000,000	$ 38,200,000
Contran Corporation | Intercorporate Services Agreements Fees
Related Party Transaction [Line Items]
Related party transaction expense		3,500,000	2,800,000	$ 3,100,000
Tall Pines Insurance Company And EWI RE Inc
Related Party Transaction [Line Items]
Related party transaction expense		2,000,000	2,200,000	1,700,000
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, 2020
Note receivable from affiliate		34,000,000	38,200,000
Interest income including unused commitment fees on our loan		2,100,000	$ 1,800,000	$ 200,000
Amount loaned		$ 6,000,000
Unsecured Revolving Demand Promissory | Valhi Inc | Subsequent Event
Related Party Transaction [Line Items]
Note receivable from affiliate					$ 40,000,000

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

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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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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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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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