Long-Term Debt - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 11, 2015	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	May 13, 2016
Debt Instrument [Line Items]
Interest expense			$ 1,800,000	$ 1,500,000	$ 3,500,000	$ 2,500,000
Interest paid			801,000	665,000	3,500,000	1,500,000
Interest capitalized			0	0	0	0
Loan Cost Amortization			125,000	94,000	227,293	167,036
Amortization of Discount on Convertible Debt			278,000	$ 293,000	551,489	$ 318,197
Line of credit facility, current borrowing capacity		$ 75,000,000	75,000,000		75,000,000
Value of income properties on the borrowing base		71,000,000
Investment in riverside property					25,100,000
Value of properties included in the borrowing base calculation		$ 14,000,000	$ 14,000,000		$ 14,000,000
Line of credit facility balance							$ 0
Maximum [Member]
Debt Instrument [Line Items]
Credit facility limits value for a single income property for borrowing base value					20.00%
4.50% Convertible Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Debt discount	$ 6,100,000