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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate for Continuing Operations (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Statutory federal income tax rate 21.00% 21.00% 21.00% 21.00%
State income taxes, net of federal income tax 3.70% 4.50% 3.50% 4.40%
Stock compensation windfall benefit (0.40%) (0.80%) (0.90%) (0.50%)
Permanent differences and other (1.20%) (1.40%) (1.40%) (1.70%)
Total effective rate for continuing operations 23.10% 23.30% 22.20% 23.20%