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Real Estate Owned and Held-For-Sale (Detail 2) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Expenses:        
Depreciation $ 1,447,642 $ 2,158,353 $ 2,886,319 $ 3,970,036
Net income 12,387,070 13,354,522 29,285,969 20,820,213
Real Estate held for sale        
Revenue:        
Property operating income 1,367,641 2,297,277 3,349,979 4,932,057
Expenses:        
Property operating expense 1,016,112 1,747,434 2,323,404 3,512,305
Depreciation 212,020 440,710 436,326 873,168
Net income $ 139,509 $ 109,133 $ 590,249 $ 546,584