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Investments (Detail) In Thousands, unless otherwise specified | Dec. 31, 2012 Other Long-term Investments Fixed-rate Investments CNY | Dec. 31, 2013 Short-term Investments Fixed-rate Investments USD ($) | Dec. 31, 2013 Short-term Investments Fixed-rate Investments CNY | Dec. 31, 2012 Short-term Investments Fixed-rate Investments CNY | Dec. 31, 2013 Short-term Investments Adjustable-rate Debt Investments USD ($) | Dec. 31, 2013 Short-term Investments Adjustable-rate Debt Investments CNY | Dec. 31, 2012 Short-term Investments Adjustable-rate Debt Investments CNY | Dec. 31, 2013 Short-term Investments Equity Investments USD ($) | Dec. 31, 2013 Short-term Investments Equity Investments CNY
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Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |
Short-term held-to-maturity investments, amortized cost |  |  | 19,339,250 | 17,072,751 |  |  |  |  |
Long-term held-to-maturities investments, amortized cost | 513,728 |  |  |  |  |  |  |  |
Held-to-maturity investments, gross unrecognized holding gains | 886 |  | 51,897 | 30,886 |  |  |  |  |
Held-to-maturity investments, gross unrecognized holding losses |  |  | (21,080) | (17,385) |  |  |  |  |
Held-to-maturity investments, fair value | 514,614 | 3,199,707 | 19,370,067 | 17,086,252 |  |  |  |  |
Available-for-sale investments, amortized cost |  |  | 7,603,087 | 3,500,945 |  | 514,433 | 17,073 |  | 604,878
Available-for-sale investments, gross unrealized gains |  |  | 24,871 | 13,454 |  | 0 | 0 |  | 648,242
Available-for-sale investments current, fair value |  | $ 1,260,049 | 7,627,958 | 3,514,399 | $ 84,978 | 514,433 | 17,073 | $ 207,001 | 1,253,120

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