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Income Taxes - Difference Between Customary Rate and Effective Tax Rate on Income Before Income Taxes Due (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Statutory rate 35.00% 35.00% 35.00%
Tax effect of:      
Nondeductible compensation (0.10%)   (0.90%)
State taxes, net of federal tax benefit 14.70% 1.40% 9.90%
Valuation allowance on deferred tax assets (54.60%) (23.50%) (13.60%)
Other (0.60%)   (0.20%)
Effective tax rate (5.60%) 12.90% 30.20%