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Shareholder's Equity - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Oct. 30, 2015
USD ($)
Jul. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2014
CNY (¥)
shares
Dec. 31, 2013
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2014
$ / shares
Stockholders Equity Note [Line Items]                
Common stock, shares authorized     870,400,000       870,400,000  
Par value per share (US$) | $ / shares     $ 0.00005         $ 0.00005
Transfer of Class B ordinary shares to Class A Ordinary shares     45,000 225,079    
Stock repurchase program, proposed aggregate value | $ $ 2,000,000 $ 1,000,000            
Stock repurchase program, period 24 months 12 months            
Number of Class A ordinary shares repurchased     603,726 603,726        
Aggregate purchase price     $ 990,160 ¥ 6,376,964        
Allocation of after-tax profits to general reserve fund, percentage     10.00% 10.00%        
Limit of general reserve fund as a percentage of registered capital, after which allocations to general reserve fund are no longer required     50.00% 50.00%        
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     $ 1,630,000   ¥ 7,540,000   ¥ 10,580,000  
Preferred Stock                
Stockholders Equity Note [Line Items]                
Common stock, shares authorized     10,000,000       10,000,000  
Par value per share (US$) | $ / shares     $ 0.00005          
Common stock, shares outstanding     0   0   0  
Common stock, shares issued     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          
Number of votes per share     1 1        
Common stock, shares outstanding     27,113,541   27,613,315   27,113,541  
Common stock, shares issued     27,113,541   27,613,315   27,113,541  
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          
Number of votes per share     10 10        
Common stock, shares outstanding     7,492,921   7,492,921   7,492,921  
Common stock, shares issued     7,492,921   7,492,921   7,492,921