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Income Taxes - Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Tax at statutory rate 21.00% 21.00% 21.00%
State income tax, net of federal benefit 24.34% 6.45% 4.41%
Non-deductible expenses 60.44% 3.98% 0.85%
Equity compensation adjustments 98.61% 6.45% 0.78%
Change in accrual estimates relating to uncertain tax positions 4.22% (9.63%) (0.84%)
Change in valuation allowance 23.67% 0.39%  
Other, net 1.71% (0.45%) 1.42%
Change in tax law     (0.71%)
Income tax provision 233.99% 28.19% 26.91%