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Certain risks and concentration (Schedule of Consolidated Financial Information of Group's VIEs and VIE's Subsidiary Excluding Inter Company Items With Group's Subsidiaries Included in Accompanying Consolidated Financial Statements) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
CNY (¥)
Current assets              
Cash and cash equivalents ¥ 1,579,743   ¥ 928,934 ¥ 475,028 $ 227,530 $ 133,794 ¥ 729,598
Short-term deposits 3,751,519   1,894,946   540,331    
Restricted short-term deposits 0   389,221   0    
Accounts receivable, net 169,571   132,353   24,423    
Inventory 2,266   14,385   326    
Amounts due from related parties 135,245   5,297   19,479    
Prepayments and other current assets 224,732   147,823   32,369    
Total current assets 5,863,076   3,512,959   844,458    
Non-current assets              
Deferred tax assets 117,811   120,284   16,969    
Investments 918,602   567,557   132,306    
Property and equipment, net 838,750   843,449   120,805    
Intangible assets, net 58,926   146,437   8,487    
Goodwill 14,300   151,638 300,382 2,060    
Other non-current assets 101,933   1,960,430   14,681    
Total non-current assets 3,922,716   3,789,795   564,989    
Total assets 9,785,792   7,302,754   1,409,447    
Current liabilities              
Accounts payable 137,107   129,819   19,748    
Deferred revenue 430,683   385,300   62,031    
Advances from customers 56,152   55,086   8,088    
Income taxes payable 140,754   107,403   20,273    
Accrued liabilities and other current liabilities 1,066,038   681,889   153,541    
Amounts due to related parties 91,245   24,917   13,142    
Total current liabilities 4,690,448   1,384,414   675,565    
Non-current liabilities              
Deferred revenue 25,459   20,752   3,667    
Deferred tax liabilities 8,058   16,817   1,161    
Total non-current liabilities 33,517   2,609,688   4,828    
Total liabilities 4,723,965   3,994,102   $ 680,393    
Net income 1,523,918 $ 219,491 1,033,243 1,064,472      
Net cash provided by operating activities 2,421,135 348,715 1,823,442 1,301,351      
Net cash used in investing activities (1,783,138) (256,824) (1,048,022) (3,954,055)      
Net (decrease) / increase in cash and cash equivalents 648,648 $ 93,425 438,277 (249,942)      
Variable interest entity [Member]              
Current assets              
Cash and cash equivalents 1,397,738   403,722        
Short-term deposits 1,235,000   250,000        
Restricted short-term deposits   110,000        
Accounts receivable, net 165,971   127,365        
Inventory 2,266   14,385        
Amounts due from related parties 135,245   5,164        
Prepayments and other current assets 207,245   117,536        
Total current assets 3,143,465   1,028,172        
Non-current assets              
Deferred tax assets 93,744   90,855        
Investments 496,870   285,292        
Property and equipment, net 261,915   292,340        
Intangible assets, net 27,241   110,214        
Land use right, net 1,872,394          
Goodwill 2,527   136,066        
Other non-current assets 85,583   1,932,356        
Total non-current assets 2,840,274   2,847,123        
Total assets 5,983,739   3,875,295        
Current liabilities              
Accounts payable 117,917   108,500        
Deferred revenue 429,883   385,300        
Advances from customers 56,108   45,189        
Income taxes payable 112,779   80,978        
Accrued liabilities and other current liabilities 988,911   579,760        
Amounts due to related parties 91,245   23,684        
Total current liabilities 1,796,843   1,223,411        
Non-current liabilities              
Deferred revenue 19,125   20,752        
Deferred tax liabilities 4,777   12,592        
Total non-current liabilities 23,902   33,344        
Total liabilities 1,820,745   1,256,755        
Net revenues 8,164,100   5,821,305 3,543,994      
Net income 1,874,435   1,267,111 1,136,570      
Net cash provided by operating activities 2,538,836   2,164,953 1,313,521      
Net cash used in investing activities (1,313,002)   (2,251,207) (994,574)      
Net cash provided by financing activities 8,508   704,298 0      
Net (decrease) / increase in cash and cash equivalents ¥ 1,234,342   ¥ 618,044 ¥ 318,947