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Commitments and contingencies (Details)
¥ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Mar. 31, 2018
USD ($)
Rental expenses   ¥ 595,300 ¥ 493,248 ¥ 248,264    
Minimum lease payments under non-cancellable leases            
Year ending December 31, 2019         ¥ 398,044  
Year ending December 31, 2010         172,549  
Year ending December 31, 2021         84,475  
Year ending December 31, 2022         49,863  
Year ending December 31, 2023         38,426  
Thereafter         7,937  
Total minimum lease payments         751,294  
Capital commitment            
Commitment capital expenditures     ¥ 2,345,658   ¥ 2,638,129  
Other commitments            
Purchase services from related partner $ 60.0 390,378        
Cooperative lending arrangement            
Other commitments            
Bank's lending portion under the arrangement   117,700        
Private equity fund | Equity investments without readily determinable fair value            
Other commitments            
Investments in equity investments without Readily determinable Fair Value   ¥ 126,100        
Maximum limit to invest in equity investments without readily determinable fair value | $ $ 250.0         $ 250.0
Minimum            
Term of renewal 1 year       1 year  
Minimum | Cooperative lending arrangement            
Other commitments            
Overdue period (days) 80 days 80 days        
Maximum            
Term of renewal 10 years       10 years