Leases - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Operating Leased Assets [Line Items]
Operating lease revenues collected	$ 485,410
Rents and other receivables	$ 66,437	$ 500,746
Maximum [Member]
Operating Leased Assets [Line Items]
Original lease terms of properties	20 years
Minimum [Member]
Operating Leased Assets [Line Items]
Original lease terms of properties	5 years