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Investments - Additional Information (Detail) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2012 CNY	Sep. 30, 2011 CNY	Dec. 31, 2011 CNY
Schedule of Investments [Line Items]
Carrying amount of cost method investments	$ 65,932	414,367		389,630
Carrying amount of equity method investments	27,641	173,716		344,730
Carrying amount of long-term held-to-maturity investments	80,427	505,473		0
Fixed-rate and adjustable-rate products in commercial banks	2,446,372	15,374,961		9,948,896
Available-for-sale debt securities with fixed-rate and adjustable rates	531,154	3,338,196		102,682
Short-term investment gains recorded in earnings	$ 80,284	504,566	49,383

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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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