Mortgages Payable - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended					9 Months Ended		1 Months Ended					9 Months Ended
	Sep. 30, 2012	Dec. 31, 2004	Dec. 31, 2000	Dec. 31, 1999	Dec. 31, 2011	Nov. 29, 2004	Sep. 30, 2012 First mortgage [Member]	Nov. 29, 2004 First mortgage [Member]	Nov. 05, 2009 Second mortgage [Member]	Sep. 30, 2012 Second mortgage [Member]	Nov. 29, 2004 Second mortgage [Member]	Sep. 30, 2012 Secured debt [Member]	Nov. 05, 2009 Secured debt [Member]	Sep. 30, 2012 Senior debt obligations [Member]
Debt Instrument [Line Items]
Mortgage loan face value						$ 84,000,000
Mortgage value, initial amount drawn						49,000,000
Mortgage loan, pay off amount								12,020,814			27,979,186
Mortgage loans, remaining amount available	35,000,000
Mortgage value, amount drawn at closing	49,000,000
Mortgage loan, interest rate	5.34%						7.00%
Mortgage loan, monthly payment amount	507,838
Mortgage loan, amortization schedule	25 years
Mortgage loan, balance amount										15,259,608				74,454,382
Principal amount of senior mortgage loan at maturity										14,585,904				69,600,350
Senior mortgage loan, maturity date														Nov. 05, 2014
Mortgage loan, additional									16,000,000
Mortgage loan, monthly payment for additional loan	113,085
Mortgage loan, amortization schedule on additional loan	25 years
Repayment term of mortgage loan without prepayment penalty	60 days
Fair value of mortgage debt												94,977,161
Mortgage financing cost	2,873,632
Estimated cost of building improvement program				22,800,000
Increase in estimated cost of building improvement program			28,000,000
Further increase in estimated cost of building improvement		100,000,000
Cost incurred by registrant related to building improvement program	78,776,559
Estimated cost of initial building improvement program on completion	100,000,000
Total financing cost on mortgage													100,000,000
Payable to Lessee, a related party	$ 3,597,647				$ 720,066