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Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 3,900,423	$ 3,627,005	$ 14,327,795	$ 11,033,204
Effective tax rate	36.70%	36.40%	36.00%	36.70%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%	35.00%
Other Tax Expense (Benefit)			$ 200,000
Valuation allowance	$ 0		0		$ 0
Excess income tax benefit from stock-based compensation			$ 1,950,951	$ 404,309

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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