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Commitments and contingencies (Details 2) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
Dec. 31, 2015
Aug. 07, 2015
Equity investment commitment | Yonghui    
Capital commitments    
Purchase price (in RMB per share)   ¥ 9.00
Total consideration for equity investment   ¥ 4,306,708
Percentage of outstanding shares subscribed (in percentage)   10.00%
Long-Term Debt Obligations    
Capital commitments    
Expected repayment of nonrecourse securitization debt in 2016 ¥ 579,843  
Expected repayment of nonrecourse securitization debt in 2017 2,753,699  
Capital commitments    
Capital commitments    
Total capital commitments contracted ¥ 1,289,609