Long-Term Debt - Summary of Notes Payable and Line of Credit (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 $66 Million Credit Facility [Member]	Sep. 30, 2013 UBS Note Payable [Member]	Feb. 22, 2013 UBS Note Payable [Member]	Sep. 30, 2013 BOA Note Payable [Member]	Mar. 08, 2013 BOA Note Payable [Member]
Proforma Debt Instrument [Line Items]
Notes Payable and Line of Credit	$ 66,727,032	$ 29,126,849	$ 36,327,032	$ 7,300,000	$ 7,300,000	$ 23,100,000	$ 23,100,000
Notes Payable and Line of Credit, Due Within One Year