Income Taxes - Components of Income Tax Expense (Benefit) (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Current state and local tax expense	$ 132,000	$ 187,000
AMT tax benefit	1,181,423	1,139,392
Deferred state and local tax benefit from excess stock based compensation deductions	$ 92,000