Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Property	Dec. 31, 2012 Property	Dec. 31, 2011	Jan. 31, 2013 Buildings	Jan. 03, 2013 Property
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset, in-place lease value net	$ 6,359,438	$ 4,527,426
Accumulated amortization expense	2,979,156	2,877,412
Lease value increased	2,920,739	1,478,688	130,070
Number of income properties acquired	9	8		2	4
Lease value decreased	416,000
Number of sale of income properties	4
Amortization expense	672,501	411,309	423,989
Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Lease value increased	$ 2,900,000	$ 1,500,000
Leases Acquired in Place [Member] | Weighted Average Maturity [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period of in place lease value	16 years