Current, Deferred and Equity Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Current	$ 5,193	$ 8,290	$ 4,354
Deferred	(5,902)	(5,287)	465
Equity		1,737
Total	$ (709)	$ 4,740	$ 4,819