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Convertible bonds (Details)
$ / shares in Units, ¥ in Thousands
12 Months Ended
Mar. 18, 2014
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2014
CNY (¥)
Convertible bonds [Line Items]                
Convertible bonds   $ 400,970,000       ¥ 2,597,403   ¥ 2,447,980
Net proceeds   ¥ 2,402,549      
Interest expense   $ 14,994,000 ¥ 97,125 56,607      
Class A common shares [Member]                
Convertible bonds [Line Items]                
Common shares, par value (in dollars per share) | $ / shares   $ 0.00001         $ 0.00001  
2.25% Convertible Senior Notes due 2019 [Member]                
Convertible bonds [Line Items]                
Convertible bonds   $ 400,000,000       ¥ 2,597,403 $ 400,000,000 ¥ 2,447,980
Aggregate principle amount $ 400,000,000              
Interest rate (as a percent)   2.25%       2.25%    
Maturity date   Apr. 01, 2019 Apr. 01, 2019          
Net proceeds 390,800,000              
Debt issuance costs $ 9,200,000              
Issuance date Mar. 18, 2014              
Interest expense | ¥     ¥ 74,786 ¥ 56,607        
2.25% Convertible Senior Notes due 2019 [Member] | Contingent redemption option [Member]                
Convertible bonds [Line Items]                
Redemption period, start date   Apr. 01, 2019 Apr. 01, 2019          
Redemption percentage   100.00% 100.00%          
2.25% Convertible Senior Notes due 2019 [Member] | Non-contingent redemption option [Member]                
Convertible bonds [Line Items]                
Redemption period, start date   Apr. 01, 2017 Apr. 01, 2017          
Redemption percentage   100.00% 100.00%          
2.25% Convertible Senior Notes due 2019 [Member] | ADS [Member]                
Convertible bonds [Line Items]                
Initial conversion rate   9.0334 9.0334          
Initial conversion price | $ / shares   $ 110.70