Related Party Transactions - Rent Income - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Operating Leased Assets [Line Items]
Operating lease expiration date	Sep. 30, 2033
Annual basic rent	$ 7,474,531	$ 7,474,112
Debt instrument amount	100,000,000
Additional rent	1,053,800	1,053,800
Lessee payable	21,951	720,066
Rent income, including total additional rent	14,234,596	11,613,895
Lease surrender descriptions	The Lessee may surrender the Lease at the end of any month, upon 60 days prior written notice; the liability of the Lessee will end on the effective date of such surrender.
Written notice lease surrender period	60 days
Lessee [Member]
Operating Leased Assets [Line Items]
Percentage of excess of net Net operating profit, percentage	50.00%
Real estate taxes incurred directly by Lessee	11,210,057	10,928,078
Base [Member]
Operating Leased Assets [Line Items]
Annual basic rent	24,000
Maximum [Member]
Operating Leased Assets [Line Items]
Operating lease expiration date	Sep. 30, 2083
Debt instrument amount	100,000,000
Monthly additional rent [Member]
Operating Leased Assets [Line Items]
Additional rent	$ 87,817