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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, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Current assets          
Cash and cash equivalents ¥ 6,004,231   ¥ 2,617,432   $ 873,279
Restricted short-term deposits 0   1,000,000   0
Short-term investments 979,053   124,550   142,397
Accounts receivable, net 198,428   153,944   28,860
Inventory 0   315   0
Amounts due from related parties 193,559   11,190   28,152
Financing receivables, net 768,343        
Prepayments and other current assets 1,019,019   221,939   148,210
Total current assets 16,489,629   10,129,474   2,398,316
Non-current assets          
Deferred tax assets 70,834   113,017   10,302
Investments 4,591,524   1,153,019   667,809
Property and equipment, net 1,296,319   1,016,998   188,542
Intangible assets, net 74,685   37,481   10,862
Amounts due from related parties 0   20,000   0
Other non-current assets 223,859   144,275   32,559
Total non-current assets 9,278,416   4,329,245   1,349,489
Total assets 25,768,045   14,458,719   3,747,805
Current liabilities          
Accounts payable 114,589   76,351   16,666
Deferred revenue 951,616   758,044   138,407
Advances from customers 101,690   80,406   14,790
Income taxes payable 235,561   146,298   34,261
Accrued liabilities and other current liabilities 2,414,371   1,465,963   351,156
Amounts due to related parties 28,336   30,502   4,121
Total current liabilities 3,853,026   3,145,799   560,399
Non-current liabilities          
Deferred revenue 91,710   57,718   13,339
Deferred tax liabilities 27,505   10,810   4,000
Total non-current liabilities 119,215   75,064   17,339
Total liabilities 3,972,241   3,220,863   $ 577,738
Net revenues 15,763,557 $ 2,292,714 11,594,792 ¥ 8,204,050  
Net income 1,641,958 238,812 2,493,235 1,523,918  
Net cash provided by operating activities 4,464,814 649,379 3,718,452 2,421,135  
Net cash used in investing activities (6,295,386) $ (915,626) (3,037,516) (2,172,359)  
Variable interest entity [Member]          
Current assets          
Cash and cash equivalents 4,665,938   1,343,731    
Short-term deposits 2,100,000   3,400,000    
Restricted short-term deposits 0   1,000,000    
Short-term investments 979,052   124,550    
Accounts receivable, net 192,932   149,958    
Inventory 0   315    
Amounts due from related parties 172,258   9,309    
Financing receivables, net 725,336   0    
Prepayments and other current assets 663,437   190,456    
Total current assets 9,498,953   6,218,319    
Non-current assets          
Long-term deposits 1,000,000   0    
Deferred tax assets 70,834   113,017    
Investments 862,272   582,775    
Property and equipment, net 655,402   359,912    
Intangible assets, net 57,050   15,504    
Land use right, net 1,784,639   1,832,739    
Amounts due from related parties 0   20,000    
Other non-current assets 143,240   133,812    
Total non-current assets 4,573,437   3,057,759    
Total assets 14,072,390   9,276,078    
Current liabilities          
Accounts payable 112,167   67,817    
Deferred revenue 950,816   757,244    
Advances from customers 101,690   80,406    
Income taxes payable 162,118   142,204    
Accrued liabilities and other current liabilities 2,207,138   1,404,877    
Amounts due to related parties 28,336   30,502    
Total current liabilities 3,562,265   2,483,050    
Non-current liabilities          
Deferred revenue 86,977   52,185    
Deferred tax liabilities 0   8,404    
Total non-current liabilities 86,977   60,589    
Total liabilities 3,649,242   2,543,639    
Net revenues 15,740,097   11,577,104 8,164,100  
Net income 3,475,109   2,766,279 1,874,435  
Net cash provided by operating activities 4,672,879   3,974,085 2,538,836  
Net cash used in investing activities (1,212,622)   (3,571,668) (1,313,002)  
Net cash provided by financing activities 0   66,875 8,508  
Net (decrease) / increase in cash and cash equivalents ¥ 3,460,257   ¥ 469,292 ¥ 1,234,342