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.

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-Name Accounting Research Bulletin (ARB)

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+ Details

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

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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	Dec. 31, 2011 Fixed-rate Investments USD ($)	Dec. 31, 2011 Fixed-rate Investments CNY	Dec. 31, 2010 Fixed-rate Investments CNY	Dec. 31, 2011 Adjustable-rate Investments USD ($)	Dec. 31, 2011 Adjustable-rate Investments CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring USD ($)	Dec. 31, 2011 Fair Value, Measurements, Recurring CNY	Dec. 31, 2010 Fair Value, Measurements, Recurring CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Time Deposits USD ($)	Dec. 31, 2011 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2010 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Money Market Fund USD ($)	Dec. 31, 2011 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2010 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Fixed-rate Investments USD ($)	Dec. 31, 2011 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2010 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2011 Fair Value, Measurements, Recurring Adjustable-rate Investments USD ($)	Dec. 31, 2011 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2010 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring CNY	Dec. 31, 2010 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2010 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2010 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 Fixed-rate Investments CNY	Dec. 31, 2010 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2010 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring CNY	Dec. 31, 2010 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2010 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2010 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2010 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2010 Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring CNY	Dec. 31, 2010 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring CNY	Dec. 31, 2011 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2010 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Time Deposits CNY	Dec. 31, 2011 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2010 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Money Market Fund CNY	Dec. 31, 2011 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2010 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Fixed-rate Investments CNY	Dec. 31, 2011 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY	Dec. 31, 2010 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Adjustable-rate Investments CNY
Cash equivalents:
Cash equivalents									$ 384,456	2,419,726	3,905,479	$ 30,557	192,324	993,047									2,419,726	3,905,479	192,324	993,047							0	0	0	0							0	0	0	0
Short-term investments:
Held-to-maturity securities	1,562,509	9,834,275	375,234	15,893	100,027										1,562,509	9,834,275	375,234	15,893	100,027								0	0	0								9,834,275	375,234	100,027								0	0	0
Available-for-sale securities				16,314	102,682													16,314	102,682										0										102,682										0
Long-term investments
Available-for-sale securities																				24,814										0										0										24,814
Assets measured at fair value						$ 2,009,729	12,649,034	5,298,574													2,612,050	4,898,526									10,036,984	375,234									0	24,814