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Shareholders' Equity (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY
Cumulative Effect on Retained Earnings, Net of Tax [Abstract]
PRC statutory reserve funds	$ 60,470us-gaap_RetainedEarningsAppropriated	375,193us-gaap_RetainedEarningsAppropriated	321,206us-gaap_RetainedEarningsAppropriated
Unreserved retained earnings	7,620,891us-gaap_RetainedEarningsUnappropriated	47,284,579us-gaap_RetainedEarningsUnappropriated	34,204,180us-gaap_RetainedEarningsUnappropriated
Total retained earnings	$ 7,681,361us-gaap_RetainedEarningsAccumulatedDeficit	47,659,772us-gaap_RetainedEarningsAccumulatedDeficit	34,525,386us-gaap_RetainedEarningsAccumulatedDeficit

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.

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

-Publisher SEC

-Name Regulation S-X (SX)

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A segregation of retained earnings which is available for dividend distribution. Earnings not paid out as dividends but instead reinvested in the core business or used to pay off debt. Unappropriated profit is part of shareholder equity. Also called cumulative distributions or earned surplus or accumulated earnings or unappropriated profit.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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