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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) (Contran, Line of Credit, USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Contran \| Line of Credit
Line Of Credit Facility [Line Items]
Net borrowings	$ 2.1
Weighted average interest rate	4.25%
Amount available for Borrowing	$ 65.3

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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