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Short-Term Investments - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Investment [Line Items] |  |  |  |
Investments, interest income | $ 5,060 | ¥ 32,925 | ¥ 21,078 | ¥ 53,494
Short-term investments |  |  |  |
Investment [Line Items] |  |  |  |
Investments, interest income | $ 618 | ¥ 4,021 | ¥ 1,148 | ¥ 37,652

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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=63488584&loc=d3e20235-122688 + Details
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