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Investments - Short-term Investments - Additional information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2011 CNY	Dec. 31, 2013 Short-term Investments USD ($)	Dec. 31, 2013 Short-term Investments CNY	Dec. 31, 2012 Short-term Investments CNY	Dec. 31, 2011 Short-term Investments CNY
Schedule of Investments [Line Items]
Investment interest income	$ 216,156	1,308,542	866,465	418,201	$ 176,980	1,070,000	726,400	149,350

X

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
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