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Short Term Investments (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Short-term investments | Fixed rate time deposits |  |  |
Investment [Line Items] |  |  |
Held-to-maturity securities | $ 84,363 | ¥ 548,890 | ¥ 277,946

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