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Assets held for sale (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 Dormitory | Dec. 31, 2013
Assets held for sale [Abstract] |  |
Assets Held-for-sale, Current | $ 4,096,411 | $ 4,130,590
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 March 31, 2014, 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 second half of year 2014. |

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- Definition Number of building sold. + References No definition available. + Details
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- Definition Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Definition A description of the assets to be disposed of and the facts and circumstances leading to the expected disposal, and the expected manner and timing of the disposal (generally no more than 12 months from the date of the balance sheet). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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