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Investments - Short-term Investments - Additional information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2014 Short-term Investments USD ($)	Dec. 31, 2014 Short-term Investments CNY	Dec. 31, 2013 Short-term Investments CNY	Dec. 31, 2012 Short-term Investments CNY
Schedule of Investments [Line Items]
Investment interest income	$ 321,184us-gaap_InvestmentIncomeInterest	1,992,818us-gaap_InvestmentIncomeInterest	1,308,542us-gaap_InvestmentIncomeInterest	866,465us-gaap_InvestmentIncomeInterest	$ 291,590us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	1,810,000us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	1,070,000us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	726,400us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember

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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration