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Investment in equity investees (Details 2) - CNY (¥) ¥ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Cost-method Investments [Line Items] |  |
Carrying value of cost method investments | ¥ 3,308,127 | ¥ 586,959
Cost method investments | 2,856,500 |
Top investee one |  |
Schedule of Cost-method Investments [Line Items] |  |
Cost method investments | 648,829 |
Top investee two |  |
Schedule of Cost-method Investments [Line Items] |  |
Cost method investments | ¥ 551,957 |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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