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Carrying Value of Land Use Rights Pledged by Company to Secure Banking Borrowings (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Land use rights | $ 2,585 | ¥ 16,818 | ¥ 17,232

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