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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
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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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.

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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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