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Investments (Tables) | 12 Months Ended
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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 |

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