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Investments Classified as Held to Maturity Securities and Available for Sale Securities (Detail) In Thousands, unless otherwise specified | Sep. 30, 2012 USD ($) | Sep. 30, 2012 CNY | Dec. 31, 2011 CNY | Sep. 30, 2012 Short-term Investments Adjustable-rate Investments USD ($) | Sep. 30, 2012 Short-term Investments Adjustable-rate Investments CNY | Dec. 31, 2011 Short-term Investments Adjustable-rate Investments CNY | Sep. 30, 2012 Short-term Investments Fixed-rate Investments USD ($) | Sep. 30, 2012 Short-term Investments Fixed-rate Investments CNY | Dec. 31, 2011 Short-term Investments Fixed-rate Investments CNY | Sep. 30, 2012 Long Term Investments Fixed-rate Investments USD ($) | Sep. 30, 2012 Long Term Investments Fixed-rate Investments CNY
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Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term held-to-maturity securities, amortized cost | $ 2,446,372 | 15,374,961 | 9,948,896 |  | 870,387 | 100,048 |  | 14,504,574 | 9,848,848 |  |
Long-term held-to-maturities securities, amortized cost | 80,427 | 505,473 | 0 |  |  |  |  |  |  |  | 505,473
Held-to-maturity securities, gross unrecognized holding gains |  |  |  |  | 1,485 |  |  | 40,809 | 10,504 |  | 1,457
Held-to-maturity securities, gross unrecognized holding losses |  |  |  |  |  | (21) |  | (26,290) | (25,077) |  |
Held-to-maturity securities, fair value |  |  |  | 138,727 | 871,872 | 100,027 | 2,310,192 | 14,519,093 | 9,834,275 | 80,660 | 506,930
Available-for-sale securities, amortized cost |  |  |  |  | 3,076,361 | 102,637 |  | 250,040 |  |  |
Available-for-sale securities, gross unrealized gains |  |  |  |  | 11,795 | 45 |  |  |  |  |
Available-for-sale securities, fair value | $ 531,154 | 3,338,196 | 102,682 | $ 491,369 | 3,088,156 | 102,682 | $ 39,785 | 250,040 |  |  |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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. 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