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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, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Singapore dollar [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax ¥ 18,081 $ 2,794 ¥ 21,564
Euro [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax 310 48 (2,746)
USD [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax 3,526 545 (13,126)
Renminbi [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax ¥ (216) $ (33) ¥ 65