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Shareholders' Equity (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Cumulative Effect on Retained Earnings, Net of Tax [Abstract]
PRC statutory reserve funds	$ 64,514	¥ 417,911	¥ 375,193
Unreserved retained earnings	11,460,904	74,241,444	47,326,133
Total retained earnings	$ 11,525,418	¥ 74,659,355	¥ 47,701,326

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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 FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.31(a)(3))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-Number 210
-Section 04
-Article 3

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- Definition

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

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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 FASB
-Name Accounting Standards Codification
-Topic 210
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