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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Income Tax Disclosure [Line Items]      
Effective tax rate expense (benefit) 53.90% 30.50%  
Income tax benefit, result of CARES act of 2020   $ (7,400)  
Income tax expense, result of Alabama business tax competitiveness act $ 1,600    
Deferred tax assets, gross 57,952   $ 55,687
Valuation allowance established against deferred tax assets 48,504   45,818
Deferred tax assets 9,448   9,869
Domestic [Member]      
Income Tax Disclosure [Line Items]      
Valuation allowance established against deferred tax assets 2,700    
Deferred tax assets, gross 46,479   43,791
Valuation allowance established against deferred tax assets $ 46,479   $ 43,791