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Financial Risk Management Objectives and Policies - Equity Price Risk Sensitivity Analysis Assuming 10% Increase/(Decrease) in Underlying Prices (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Equity price risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax $ 327 ¥ 2,188 ¥ 2,471