Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Percentage of donated shares of common stock		7.00%
Number of donated shares of common stock	314,755	314,755
Value of donated shares of common stock	$ 3,147,550		$ 3,147,550
Value of donated shares of common stock, per share		$ 10.00
Donation of cash	450,000		450,000
Total donated stock and cash expensed			$ 3,597,550