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Summary of significant accounting policies (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
CNY (¥)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
CNY (¥)
Dec. 31, 2018
CNY (¥)
Foreign currency translation        
Total exchange gains/(losses) ¥ 53,884,000 $ 7,539 ¥ (245,273,000)  
Total foreign currency translation adjustments gains/(losses) ¥ 1,566,201,000 $ 219,120 2,768,935,000  
Convenience translation        
Convenience translation rate (RMB to USD) 7.1477      
Loan receivables, net        
Provision for the doubtful loan receivables ¥ 0   0  
Others, net        
Foreign currency translation        
Total exchange gains/(losses) ¥ 53,884,000   ¥ (245,273,000)  
Minimum        
Loan receivables, net        
Loan periods extended range 1 month 1 month    
Maximum        
Loan receivables, net        
Loan periods extended range 24 months 24 months    
Other non-current assets        
Loan receivables, net        
Loan receivables ¥ 42,379,000     ¥ 105,455,000