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Common shares (Details)
 1 Months Ended 12 Months Ended
Nov. 21, 2012
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Share repurchase program approved on May 4, 2014 and March 5, 2015 [Member]            
Common shares [Line Items]            
Number of share repurchase programs   2        
Share repurchase program authorized amount | $   $ 200,000,000        
Average purchase price per share | $ / shares       $ 54.82    
Shares repurchased value | $       $ 169,500,000    
Share repurchase programs, shares       3,092,556    
Class A common shares [Member]            
Common shares [Line Items]            
Issuance of common shares (in shares) 179,400,000       25,036,140  
Issuance costs of common stock | $     $ 11,887,180 $ 26,110,680    
Common shares, shares authorized     10,000,000,000 10,000,000,000 10,000,000,000  
Common shares, shares issued     750,115,028 728,227,848 706,173,568  
Common shares, shares outstanding     750,115,028 728,227,848 706,173,568  
Class B common shares [Member]            
Common shares [Line Items]            
Common shares, shares authorized     1,000,000,000 1,000,000,000 1,000,000,000  
Common shares, shares issued     359,557,976 369,557,976 427,352,696  
Common shares, shares outstanding     359,557,976 369,557,976 427,352,696  
Common shares [Member]            
Common shares [Line Items]            
Conversion of Stock, Shares Converted 548,408,914          
Common shares [Member] | Share repurchase program approved on May 4, 2014 and March 5, 2015 [Member]            
Common shares [Line Items]            
Average purchase price per share | $ / shares       $ 2.74    
Share repurchase programs, shares       61,851,120    
Common shares [Member] | Class A common shares [Member]            
Common shares [Line Items]            
Common shares, shares outstanding     750,115,028 728,227,848 706,173,568 622,658,738
Common shares [Member] | Class B common shares [Member]            
Common shares [Line Items]            
Conversion of Stock, Shares Converted     10,000,000 57,794,720 58,478,690  
Common shares, shares outstanding     359,557,976 369,557,976 427,352,696 485,831,386