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Investments (Detail) In Thousands, unless otherwise specified | Dec. 31, 2012 Long Term Investments Fixed-rate Investments USD ($) | Dec. 31, 2012 Long Term Investments Fixed-rate Investments CNY | Dec. 31, 2012 Short-term Investments Fixed-rate Investments USD ($) | Dec. 31, 2012 Short-term Investments Fixed-rate Investments CNY | Dec. 31, 2011 Short-term Investments Fixed-rate Investments CNY | Dec. 31, 2012 Short-term Investments Adjustable-rate Investments USD ($) | Dec. 31, 2012 Short-term Investments Adjustable-rate Investments CNY | Dec. 31, 2011 Short-term Investments Adjustable-rate Investments CNY
--- | --- | --- | --- | --- | --- | --- | --- | ---
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Short-term held-to-maturity securities, amortized cost |  |  |  | 17,072,751 | 9,848,848 |  |  | 100,048
Long-term held-to-maturities securities, amortized cost |  | 513,728 |  |  |  |  |  |
Held-to-maturity securities, gross unrecognized holding gains |  | 886 |  | 30,886 | 10,504 |  |  | 0
Held-to-maturity securities, gross unrecognized holding losses |  | 0 |  | (17,385) | (25,077) |  |  | (21)
Held-to-maturity securities, fair value | 82,601 | 514,614 | 2,742,533 | 17,086,252 | 9,834,275 |  |  | 100,027
Available-for-sale securities, amortized cost |  |  |  | 3,500,945 |  |  | 17,073 | 102,637
Available-for-sale securities, gross unrealized gains |  |  |  | 13,454 |  |  | 0 | 45
Available-for-sale securities, fair value |  |  | $ 564,100 | 3,514,399 |  | $ 2,740 | 17,073 | 102,682

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