Related Party Transactions - Rent Income - Schedule of Rent Income (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Operating Leased Assets [Line Items]
Basic rent income	$ 7,474,531	$ 7,474,112
Advance of additional rent	1,053,800	1,053,800
Further additional rent	5,706,265	3,085,983
Total additional rent	6,760,065	4,139,783
Rent income	$ 14,234,596	$ 11,613,895