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Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]      
Federal statutory tax rate 21.00% 21.00% 21.00%
State, net of federal benefit 5.20% 3.80% (0.30%)
State rate and law change 4.30% 1.80% 0.90%
Valuation allowances (26.30%) (3.80%) (0.40%)
Non-deductible equity compensation (0.70%) (0.20%) (0.10%)
Goodwill impairment 0.00% 0.00% (19.40%)
Consolidated effective tax rate 3.50% 22.60% 1.70%