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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Balance at the beginning of the period	$ 255,565
Equity in earnings of Kronos Worldwide, Inc.	9,225	$ 21,479
Dividends received from Kronos	(6,339)	$ (5,987)
Equity in Kronos' other comprehensive income:
Balance at the end of the period	259,061
Kronos
Balance at the beginning of the period	255,500
Equity in earnings of Kronos Worldwide, Inc.	9,200
Dividends received from Kronos	(6,300)
Equity in Kronos' other comprehensive income:
Balance at the end of the period	259,100
Kronos \| Defined Benefit Pension Plans
Equity in Kronos' other comprehensive income:
Defined benefit pension plans	$ 700

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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