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Income Taxes - Details of Reconciliation of Income Taxes (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal statutory rate 35.00% 35.00% 35.00%
Increase (decrease) in taxes resulting from:      
State and local taxes 17.30% 2.00% 2.00%
Nondeductible items (17.60%) 0.80% 1.90%
Tax Cuts and Jobs Act of 2017 (147.70%)    
Prior year true-up items 6.80%    
Refundable Tax Credits 3.60%    
Other, net 0.10% (0.10%) (0.80%)
Change in valuation allowance (0.10%) (2.40%) (177.90%)
Effective income tax rate (102.60%) 35.30% (139.80%)