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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Tax at statutory rate 35.00% 35.00% 35.00%
State income tax, net of federal benefit 2.94% 2.97% 2.74%
Non-deductible expenses 0.43% 0.34% 0.33%
Change in accrual estimates relating to uncertain tax positions (2.11%) (0.43%) (0.59%)
Change in valuation allowance 0.48% 0.29%  
Other, net 0.06% (0.41%) 0.15%
Income tax provision 36.80% 37.76% 37.63%