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Income Taxes - Component of Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$ 3,200	$ 700	$ 6,600	$ 500
Rate differences on equity in earnings of Kronos, net of dividends	(1,200)	(2,200)	(2,200)	(5,400)
U.S. state income taxes and other, net	(100)			100
Income tax expense (benefit)	$ 1,901	$ (1,516)	$ 4,406	$ (4,779)

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Income tax reconciliation state income taxes and other net.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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