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Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2010
Contran
Related Party Transaction [Line Items]
Expense transaction with affiliate			$ 100,000	$ 100,000	$ 100,000
Contran | Intercorporate Services Agreement
Related Party Transaction [Line Items]
Intercorporate services fees			15,200,000	13,400,000	12,300,000
Contran | Scenario, Forecast | Intercorporate Services Agreement
Related Party Transaction [Line Items]
Intercorporate services fees		$ 15,700,000
Promissory note | Contran
Related Party Transaction [Line Items]
Borrowed funds	$ 190,000,000					$ 190,000,000
Repayments of Lines of Credit						$ 20,000,000
Interest expense on loan					1,600,000
LPC | Titanium Dioxide Pigments
Related Party Transaction [Line Items]
Purchase of TiO2			157,900,000	176,500,000	193,100,000
LPC | Titanium Dioxide Feedstock
Related Party Transaction [Line Items]
Sales of feedstock ore to LPC			68,800,000	80,600,000	98,400,000
Valhi Inc | Unsecured Revolving Demand Promissory Note
Related Party Transaction [Line Items]
Outstanding loans under promissory note			$ 0	0
Maximum lending capacity							$ 60,000,000
Percentage of Interest over Prime rate							1.00%
Interest payable quarterly for the loan			prime plus 1.00%
Valhi Inc | Unsecured Revolving Demand Promissory Note | Interest Income
Related Party Transaction [Line Items]
Interest income on loan			$ 400,000	500,000	500,000
Tall Pines Insurance Inc and EWIRE Inc | Insurance Premiums
Related Party Transaction [Line Items]
Expense transaction with affiliate			$ 9,200,000	$ 10,300,000	$ 10,700,000

X

- Definition

Maximum lending capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of interest expense incurred on a debt or other obligation to 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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No definition available.

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- Definition

The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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- Definition

Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Related Parties
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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