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Shareholder's Equity - Additional Information (Detail)
$ / shares in Units, ¥ in Millions
 12 Months Ended
Oct. 29, 2015
USD ($)
Jul. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2016
$ / shares
Stockholders Equity Note [Line Items]                    
Common stock, shares authorized     870,400,000         870,400,000 870,400,000  
Par value per share (US$) | $ / shares                   $ 0.00005
Transfer of Class B ordinary shares to Class A Ordinary shares     200,000 200,000 91,667 0 0      
Stock repurchase program, proposed aggregate value | $ $ 2,000,000,000 $ 1,000,000,000                
Stock repurchase program, period 24 months 12 months                
Number of Class A ordinary shares repurchased     145,783 145,783 0 603,726 603,726      
Aggregate purchase price     $ 251,000,000 ¥ 1,724 $ 0 $ 990,000,000 ¥ 6,377      
Allocation of after-tax profits to statutory surplus fund, percentage     10.00% 10.00%            
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required     50.00% 50.00%            
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs     $ 2,900,000,000         ¥ 18,600 ¥ 13,700  
Preferred Stock                    
Stockholders Equity Note [Line Items]                    
Par value per share (US$) | $ / shares     $ 0.00005              
Preferred stock, shares authorized     10,000,000         10,000,000    
Preferred stock, shares issued     0         0 0  
Preferred stock, shares outstanding     0         0 0  
Class A Ordinary Shares                    
Stockholders Equity Note [Line Items]                    
Common stock, shares authorized     825,000,000         825,000,000 825,000,000  
Par value per share (US$) | $ / shares     $ 0.00005             0.00005
Number of votes per share     1 1            
Common stock, shares outstanding     27,614,978         27,614,978 27,325,551  
Class B Ordinary Shares                    
Stockholders Equity Note [Line Items]                    
Common stock, shares authorized     35,400,000         35,400,000 35,400,000  
Par value per share (US$) | $ / shares     $ 0.00005             $ 0.00005
Number of votes per share     10 10            
Common stock, shares outstanding     7,201,254         7,201,254 7,401,254