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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
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 2.90% 3.70% 2.80% 3.50%
Stock-based compensation windfall benefit (0.00%) (0.40%) (0.50%) (0.90%)
Permanent differences and other (0.40%) (1.20%) (0.10%) (1.40%)
Total effective rate for continuing operations 23.50% 23.10% 23.20% 22.20%