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Income Taxes - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]          
Income Tax Expense (Benefit) $ 5,624,808 $ 5,401,304 $ 10,796,584 $ 10,427,372  
Effective tax rate 36.50% 37.00% 36.20% 35.80%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00% 35.00%  
Other Tax Expense (Benefit)     $ 100,000 $ 200,000  
Valuation allowance $ 0   0   $ 0
Income Tax Effects Allocated Directly to Equity     $ (5,300,000) $ (1,600,000)