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Restricted cash and restricted time deposit (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Restricted cash and restricted time deposit        
Restricted cash   $ 326,486 ¥ 2,114,913 ¥ 3,038,286
Short-term bank loans   $ 469,327 3,040,209 1,890,771
Bank loan        
Restricted cash and restricted time deposit        
Short-term bank loans | $ $ 309,000      
Restricted cash for issuance of bank acceptance and letter of guarantee        
Restricted cash and restricted time deposit        
Restricted cash     ¥ 2,114,913 1,038,286
Restricted cash for collaterals for the short-term bank loans        
Restricted cash and restricted time deposit        
Restricted cash       ¥ 2,000,000
Term of bank deposits 1 year