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Income Taxes - Component of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 21%	$ 2,900	$ 6,000	$ (11,400)
Rate differences on equity in earnings of Kronos, net of dividends	(5,300)	(5,300)	(5,000)
Change in federal tax rate, net			800
U.S. state income taxes and other, net	(100)	(100)	200
Income tax expense (benefit)	$ (2,515)	$ 579	$ (15,361)

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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 increase (decrease) in the income tax rates.

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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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