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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate for Continuing Operations (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
State income taxes, net of federal income tax 3.20% 3.70% 2.80%
Stock-based compensation windfall benefit (40.00%) (50.00%) (80.00%)
Permanent difference - credits (0.90%) (1.70%) (2.30%)
Permanent difference - other 0.20% 0.30% 0.70%
Other   (0.10%) (0.20%)
Total effective rate for continuing operations 23.40% 23.20% 21.60%
162(m) Limitation      
Income Taxes [Line Items]      
Permanent difference 0.30% 0.50% 0.40%