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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Balance at the beginning of the period			$ 284,523,000
Equity in earnings of Kronos	10,069,000	(10,303,000)	14,412,000	(22,790,000)
Dividends received from Kronos			(10,566,000)	(10,566,000)
Other, principally equity in Kronos’ other comprehensive loss			(4,900,000)
Balance at the end of the period	$ 283,375,000		$ 283,375,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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