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Marketable Securities - Schedule of Marketable Securities (Detail) (Level 1 [Member], Valhi common stock [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Level 1 [Member] | Valhi common stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Market value	$ 230,686	$ 179,662
Cost basis	24,347	24,347
Unrealized gains (losses)	$ 206,339	$ 155,315

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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