Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities and which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

- Definition

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References+ Details

Assets Measured at Fair Value on Recurring Basis (Detail) In Thousands, unless otherwise specified	Sep. 30, 2012 USD ($)	Sep. 30, 2012 CNY	Dec. 31, 2011 CNY	Sep. 30, 2012 Fair Value, Measurements, Recurring USD ($)	Sep. 30, 2012 Fair Value, Measurements, Recurring CNY	Sep. 30, 2012 Fair Value, Measurements, Recurring Time Deposits USD ($)	Sep. 30, 2012 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Time Deposits CNY	Sep. 30, 2012 Fair Value, Measurements, Recurring Money Market Fund USD ($)	Sep. 30, 2012 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Short-term Investments CNY	Sep. 30, 2012 Fair Value, Measurements, Recurring Short-term Investments Fixed-rate Investments USD ($)	Sep. 30, 2012 Fair Value, Measurements, Recurring Short-term Investments Fixed-rate Investments CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Short-term Investments Fixed-rate Investments CNY	Sep. 30, 2012 Fair Value, Measurements, Recurring Short-term Investments Adjustable-rate Investments USD ($)	Sep. 30, 2012 Fair Value, Measurements, Recurring Short-term Investments Adjustable-rate Investments CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Short-term Investments Adjustable-rate Investments CNY	Sep. 30, 2012 Fair Value, Measurements, Recurring Long Term Investments Fixed-rate Investments USD ($)	Sep. 30, 2012 Fair Value, Measurements, Recurring Long Term Investments Fixed-rate Investments CNY	Sep. 30, 2012 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring CNY	Sep. 30, 2012 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Time Deposits CNY	Sep. 30, 2012 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Short-term Investments CNY	Sep. 30, 2012 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Short-term Investments CNY	Sep. 30, 2012 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Short-term Investments Fixed-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Short-term Investments Fixed-rate Investments CNY	Sep. 30, 2012 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Short-term Investments Adjustable-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Short-term Investments Adjustable-rate Investments CNY	Sep. 30, 2012 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Long Term Investments Fixed-rate Investments CNY
Cash equivalents:
Cash equivalents						$ 85,745	538,892	2,419,726	$ 22,583	141,929	192,324											538,892	2,419,726	141,929	192,324
Short-term investments:
Held-to-maturity securities													2,310,192	14,519,093	9,834,275	138,727	871,872	100,027	80,660	506,930									14,519,093	9,834,275	871,872	100,027	506,930
Available-for-sale securities	531,154	3,338,196	102,682										39,785	250,040		491,369	3,088,156	102,682											250,040		3,088,156	102,682
Long-term investments:
Held-to-maturity securities													2,310,192	14,519,093	9,834,275	138,727	871,872	100,027	80,660	506,930									14,519,093	9,834,275	871,872	100,027	506,930
Assets measured at fair value				$ 3,169,061	19,916,912							12,649,034									680,821					2,612,050	19,236,091	10,036,984