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Investment in equity investees (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Equity investee activity [Roll Forward]      
Balance at year beginning   ¥ 586,959 ¥ 36,502
Additions   10,727,273 552,493
Share of results and other comprehensive income   (186,302)  
Transferred from investment securities   305,655  
Impairment loss   (3,152,298)  
Foreign currency translation adjustments   582,962 (2,036)
Balance at year end $ 1,368,404 8,864,249 586,959
Cost method      
Equity investee activity [Roll Forward]      
Balance at year beginning   586,959 36,502
Additions   2,856,500 552,493
Impairment loss   (285,051)  
Foreign currency translation adjustments   149,719 (2,036)
Balance at year end   3,308,127 ¥ 586,959
Equity method      
Equity investee activity [Roll Forward]      
Additions   7,870,773  
Share of results and other comprehensive income   (186,302)  
Transferred from investment securities   305,655  
Impairment loss   (2,867,247)  
Foreign currency translation adjustments   433,243  
Balance at year end   ¥ 5,556,122