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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate for Continuing Operations (Detail)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]    
Statutory federal income tax rate 21.00% 21.00%
State income taxes, net of federal income tax 2.20% 4.20%
Stock compensation windfall benefit (16.00%) (0.10%)
Permanent differences and other (4.40%) (1.10%)
Total effective rate for continuing operations 2.80% 24.00%