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Income Taxes - Narrative (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Income Tax Expense (Benefit) $ 5,171,776 $ 5,026,067  
Effective tax rate 35.80% 34.60%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00%  
Other Tax Expense (Benefit) $ 100,000 $ 200,000  
Income Tax Effects Allocated Directly to Equity (5,200,000) $ (1,300,000)  
Valuation allowance $ 0   $ 0