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Additional information: condensed financial statements of the Company (Condensed balance sheets) (Parenthetical) (Details) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class A common shares [Member]      
Condensed balance sheets [Line Items]      
Common shares, par value (in dollars per share) $ 0.00001 $ 0.00001  
Common shares, shares authorized 10,000,000,000 10,000,000,000 10,000,000,000
Common shares, shares issued 728,227,848 706,173,568 622,658,738
Common shares, shares outstanding 728,227,848 706,173,568 622,658,738
Class B common shares [Member]      
Condensed balance sheets [Line Items]      
Common shares, par value (in dollars per share) $ 0.00001 $ 0.00001  
Common shares, shares authorized 1,000,000,000 1,000,000,000 1,000,000,000
Common shares, shares issued 369,557,976 427,352,696 485,831,386
Common shares, shares outstanding 369,557,976 427,352,696 485,831,386
Parent [Member] | Class A common shares [Member]      
Condensed balance sheets [Line Items]      
Common shares, par value (in dollars per share) $ 0.00001 $ 0.00001  
Common shares, shares authorized 10,000,000,000 10,000,000,000  
Common shares, shares issued 728,227,848 706,173,568  
Common shares, shares outstanding 728,227,848 706,173,568  
Parent [Member] | Class B common shares [Member]      
Condensed balance sheets [Line Items]      
Common shares, par value (in dollars per share) $ 0.00001 $ 0.00001  
Common shares, shares authorized 1,000,000,000 1,000,000,000  
Common shares, shares issued 369,557,976 427,352,696  
Common shares, shares outstanding 369,557,976 427,352,696