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Income Taxes - Reconciles Statutory Federal Income Tax Rate to Company' s Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Expected provision at federal statutory tax rate 35.00% 35.00% 35.00%
Increases (decreases) resulting from:      
Disallowed meals & entertainment 0.20% 0.40% 0.40%
Disallowed compensation 1.10% 4.20% 2.30%
State income tax, net of federal tax benefit 3.40% 3.60% 3.60%
Effect of change in rate 0.10%    
Other, net (0.60%) (0.40%)  
Total income tax expense (benefit) 39.20% 42.80% 41.30%