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Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 5,401,304	$ 4,067,485	$ 10,427,372	$ 7,406,199
Effective tax rate	37.00%	37.00%	35.80%	36.90%
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			$ 1,619,727	$ 226,873

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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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