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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The effective interest rate at the end of the reporting period.

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Long-term debt - Kronos Term Loan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			1 Months Ended	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Kronos Worldwide, Inc. [Member]	Dec. 31, 2012 Kronos Worldwide, Inc. [Member]	Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Contran [Member]	Mar. 31, 2013 Kronos Worldwide, Inc. [Member] Contran [Member]	Mar. 31, 2013 Kronos Worldwide, Inc. [Member] Term Loan [Member]	Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Term Loan [Member] Principal Prepayment [Member]	Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Term Loan [Member] Outstanding Balance Including Unamortized Discount [Member]
Debt Instrument [Line Items]
Payment of Principal Amount							$ 290
Pre Tax Interest Charge	(6.6)						6.6
Cash used for payment of term loan							100
Borrowing from Contran for prepayment of term loan							190
Term loan maturity date				Jun. 30, 2018
Principal amount outstanding		98.6	384.5					100.0
Percentage of average interest rate					7.375%	7.00%
Percentage of average interest rate, during period					7.375%	6.60%
Unamortized Discount		$ 1.4