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Reserves - Summary of Other Components of Equity (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
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Disclosure of other components of equity [Line Items] |  |  |
Other components of equity | ¥ 74,722 | $ 11,805 | ¥ 11,560
Foreign currency translation reserve (Note 24) [Member] |  |  |
Disclosure of other components of equity [Line Items] |  |  |
Other components of equity | (82,939) | (13,104) | (43,959)
Performance shares reserves (Note 24) [Member] |  |  |
Disclosure of other components of equity [Line Items] |  |  |
Other components of equity | 19,758 | 3,122 | 20,839
Reserve of asset classified as held for sale (Note 22) [Member] |  |  |
Disclosure of other components of equity [Line Items] |  |  |
Other components of equity |  |  | 22,720
(Premium paid for)/discount on acquisition of non-controlling interests [Member] |  |  |
Disclosure of other components of equity [Line Items] |  |  |
Other components of equity | ¥ (11,541) | $ (1,823) | ¥ (11,160)

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