Mortgages Payable - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended			1 Months Ended	12 Months Ended				1 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Oct. 15, 2009	Dec. 31, 2012 Scenario, Option One [Member]	Dec. 31, 2012 Scenario, Option Two [Member]	Oct. 15, 2009 Line of Credit [Member]	Dec. 29, 2004 First Mortgage [Member]	Dec. 31, 2012 First Mortgage [Member]	Dec. 31, 2005 First Mortgage [Member]	Dec. 31, 2011 First Mortgage [Member]	Jan. 05, 2007 First Mortgage [Member]	Sep. 01, 2005 Pre Existing First Mortgage [Member]	Mar. 05, 2009 Second Mortgage [Member]	May 25, 2006 Second Mortgage [Member]	Dec. 31, 2012 Second Mortgage [Member]	Dec. 31, 2011 Second Mortgage [Member]
Debt Instrument [Line Items]
Debt instrument amount			$ 42,910,000			$ 21,000,000	$ 30,500,000							$ 12,410,000
Repayments of debt							3,000,000		27,500,000			15,500,000	10,310,000	2,100,000
Debt instrument interest rate											5.33%		6.13%
Loan, monthly payments								184,213							80,947
Loan, amortization schedule								25 years
Loan, balance amount								26,441,949		27,220,488					11,524,070	11,780,416
Principal amount on maturity date								24,754,972							10,961,870
Debt maturity date								Jan. 05, 2015							Jan. 05, 2015
Maximum period for no prepayment penalty at the end of term								60 days							60 days
Loan, amortization schedule															25 years
Debt instrument outstanding	14,934,616	5,934,616	934,616
Basis spread on variable rate	1.00%			3.00%	3.25%
Interest rate, Maximum	6.50%			6.50%	6.75%
Minimum increments	5,000,000
Fair value of mortgage debt	$ 55,478,595	$ 47,991,102