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Ordinary Shares (Details)
¥ in Thousands
1 Months Ended 12 Months Ended
Nov. 20, 2015
USD ($)
shares
May. 08, 2015
USD ($)
shares
May. 08, 2015
CNY (¥)
shares
May. 08, 2015
CNY (¥)
Dec. 15, 2014
USD ($)
shares
Dec. 15, 2014
CNY (¥)
shares
Feb. 13, 2014
item
May. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2014
CNY (¥)
shares
Dec. 31, 2013
CNY (¥)
May. 09, 2014
shares
Class of Stock [Line Items]                            
Conversion ratio for convertible preferred shares             1              
Ordinary shares, shares issued | shares                 188,435,922 286,970,892 286,970,892 188,435,922    
Proceeds from the private placement, net of issuance cost                   $ 375,162,000 ¥ 2,430,223 ¥ 905,590  
Business Cooperation Agreement [Member]                            
Class of Stock [Line Items]                            
Fair value of acquired intangible assets     ¥ 660,215 ¥ 660,215                    
Class A ordinary shares [Member]                            
Class of Stock [Line Items]                            
Number of voting rights to holders of each share of common stock | item             1              
Ordinary shares, shares issued | shares                 82,487,876 269,597,392 269,597,392 82,487,876    
Class B ordinary shares [Member]                            
Class of Stock [Line Items]                            
Number of voting rights to holders of each share of common stock | item             10              
Ordinary shares, shares issued | shares                 105,948,046 17,373,500 17,373,500 105,948,046    
Initial public offering [Member]                            
Class of Stock [Line Items]                            
Issuance costs                       ¥ 22,732    
Total consideration amount                       632,472    
Initial public offering [Member] | Additional paid-in capital [Member]                            
Class of Stock [Line Items]                            
Total consideration amount                       632,449    
Initial public offering [Member] | DCM Hybrid RMB Fund, L.P. [Member] | Class A ordinary shares [Member]                            
Class of Stock [Line Items]                            
Ordinary shares, shares issued | shares                           5,000,000
Initial public offering [Member] | Qihoo 360 Technology Co. Ltd. [Member] | Class A ordinary shares [Member]                            
Class of Stock [Line Items]                            
Ordinary shares, shares issued | shares                           1,666,666
Initial public offering [Member] | Ctrip [Member] | Class A ordinary shares [Member]                            
Class of Stock [Line Items]                            
Ordinary shares, shares issued | shares                           5,000,000
Private Placement [Member]                            
Class of Stock [Line Items]                            
Issuance costs                     ¥ 1,078 14,279    
Total consideration amount                     3,104,514 891,513    
Private Placement [Member] | Additional paid-in capital [Member]                            
Class of Stock [Line Items]                            
Total consideration amount                     ¥ 3,104,457 ¥ 891,491    
Private Placement [Member] | Business Cooperation Agreement [Member] | Additional paid-in capital [Member]                            
Class of Stock [Line Items]                            
Total consideration amount       ¥ 3,104,457                    
Private Placement [Member] | Class A ordinary shares [Member]                            
Class of Stock [Line Items]                            
Issuance of ordinary shares,net of issuance costs (in shares) | shares 90,909,091 93,750,000 93,750,000   36,812,868 36,812,868                
Proceeds from the private placement, net of issuance cost $ 500,000,000 $ 400,000,000 ¥ 2,445,000   $ 148,000,000 ¥ 905,792                
Issuance costs     ¥ 1,078     ¥ 14,279                
Private Placement [Member] | Ctrip [Member] | Class A ordinary shares [Member]                            
Class of Stock [Line Items]                            
Issuance of ordinary shares,net of issuance costs (in shares) | shares               3,750,000 3,731,034          
Proceeds from the private placement, net of issuance cost | $               $ 20,000,000 $ 15,000,000