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Investments - Short-term Investments - Additional information (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 321,184 us-gaap_InvestmentIncomeInterest | 1,992,818 us-gaap_InvestmentIncomeInterest | 1,308,542 us-gaap_InvestmentIncomeInterest | 866,465 us-gaap_InvestmentIncomeInterest | $ 291,590 us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 1,810,000 us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 1,070,000 us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 726,400 us-gaap_InvestmentIncomeInterest / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember

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- 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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Balance Type: | credit
Period Type: | duration

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- Details
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