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Investments - Short-term Investments - Additional information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |
Investment interest income | $ 364,728 | ¥ 2,362,632 | ¥ 1,992,818 | ¥ 1,308,542
Short-term Investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment interest income | $ 339,200 | ¥ 2,200,000 | ¥ 1,810,000 | ¥ 1,070,000

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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 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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