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Assets held for sale (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Dormitory
Dec. 31, 2012
Assets held for sale [Abstract]    
Assets Held-for-sale, Current $ 4,116,497   
Number of employee dormitory buildings sold 3  
Long Lived Assets Held-for-sale, Description As the sale was not yet completed by the end of September 30, 2013, the dormitories were classified as held for sale in accordance with ASC 360-10-35. It was expected that the sales will be consummated by the end of year 2013.