Annual report pursuant to Section 13 and 15(d)

Income Taxes - Statutory Rate and Provisions for Income Taxes Percent (Detail)

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Income Taxes - Statutory Rate and Provisions for Income Taxes Percent (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 21.00% 21.00% 35.00%
State income taxes, net of federal benefit 4.80% 5.70% 4.40%
Nondeductible expenses 1.80% 2.60% 3.20%
Uncertain tax position (0.90%) (1.30%)  
Tax Cut and Jobs Act Enactment 0.00% 0.00% (22.90%)
Excess tax benefit (2.50%) (2.60%) (1.60%)
Credits and other (2.50%) 0.70% (0.10%)
Effective tax rate 21.70% 26.10% 18.00%