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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 annual rent $ 3,534,344 $ 3,288,666
Primary Overage rent 752,000 752,000
Secondary Overage rent 3,558,414 4,350,339
Total Overage rent 4,310,414 5,102,339
Rent income $ 7,844,758 $ 8,391,005