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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate for Continuing Operations (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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% 3.40% 2.60% 3.30%
Stock-based compensation windfall benefit (0.50%) (0.20%) (0.90%) (1.40%)
Permanent differences and other 0.40% (1.20%) 0.20% (1.60%)
Total effective rate for continuing operations 23.80% 23.00% 22.90% 21.30%