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Subsequent events (Details)
¥ in Thousands, $ in Thousands
1 Months Ended
Mar. 30, 2017
USD ($)
Mar. 21, 2017
USD ($)
Mar. 08, 2017
USD ($)
Feb. 17, 2017
CNY (¥)
Jan. 19, 2017
CNY (¥)
Apr. 01, 2017
USD ($)
Feb. 17, 2017
USD ($)
Jan. 19, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Subsequent events [Line Items]                      
Convertible Debt, Current [1]                 ¥ 2,768,469 $ 398,742 ¥ 0
Short-term Debt [Member]                      
Subsequent events [Line Items]                      
Convertible Debt, Current | ¥                 ¥ 2,768,469   ¥ 0
Short-term Debt [Member] | Scenario, Forecast [Member]                      
Subsequent events [Line Items]                      
Debt Instrument, Repurchase Amount           $ 399,000          
Convertible Debt, Current           $ 1,000          
Subsequent event [Member] | Loan Agreement [Member]                      
Subsequent events [Line Items]                      
Debt Instrument, Face Amount             $ 60,000 $ 30,000      
Line of Credit Facility, Interest Rate Description       3-month LIBOR plus 0.85%, accruing from draw-down 3-month LIBOR plus 1.5%, accruing from draw-down            
Line of Credit Facility, Maximum Borrowing Capacity             $ 80,000 $ 80,000      
Debt Instrument, Collateral Amount | ¥       ¥ 500,000 ¥ 500,000            
Proceeds from Lines of Credit $ 15,000 $ 45,000 $ 30,000                
[1] Convertible bonds classified in current liabilities represent Convertible Senior Notes which may be redeemed within one year.