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Investments (Tables)
 12 Months Ended
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]  
Investments Classified as Held-to-Maturity Securities and Available-for-Sale Securities

Investments classified as held-to-maturity investments and available-for-sale investments as of December 31, 2012 and 2013 were as follows:

 

     As of December 31, 2012  
     Amortized
cost		      Gross un-
recognized
holding gains		      Gross
unrecognized
holding losses		     Gross
unrealized
gains		      Fair value  
             
     RMB      RMB      RMB     RMB      RMB  
     (In thousands)  

Short-term investments:

              

Held-to-maturity investments

              

Fixed-rate investments

      17,072,751         30,886         (17,385 )         17,086,252   

Available-for-sale investments

              

Fixed-rate debt investments

      3,500,945              13,454         3,514,399   

Adjustable-rate debt investments

      17,073              —           17,073   

Long-term investments:

              

Fixed-rate held-to-maturity investments

      513,728         886         —             514,614   

 

     As of December 31, 2013  
     Amortized
cost		      Gross un-
recognized
holding gains		      Gross
unrecognized
holding losses		     Gross
unrealized
gains		      Fair
value		      Fair
value		  
   RMB      RMB      RMB     RMB      RMB      US$  
     (In thousands)  

Short-term investments:

                 

Held-to-maturity investments

                 

Fixed-rate investments

      19,339,250         51,897         (21,080 )         19,370,067         3,199,707   

Available-for-sale investments

                 

Fixed-rate debt investments

      7,603,087              24,871         7,627,958         1,260,049   

Adjustable-rate debt investments

      514,433              —           514,433         84,978   

Equity investment

      604,878              648,242         1,253,120         207,001