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Financial Risk Management Objectives and Policies - Foreign Currency Risk Sensitivity Analysis Assuming 10% Strengthening of Major Currencies against Functional Currency (Detail) - Foreign currency risk [Member] ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Singapore Dollar [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect on profit before tax | ¥ 41,585 | $ 6,570 | ¥ 8,422
Euro [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect on profit before tax | (937) | (148) | 231
USD [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect on profit before tax | 4,522 | 714 | (8,765)
Renminbi [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Effect on profit before tax | ¥ (3,504) | $ (554) | ¥ 3,027

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