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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, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Singapore dollar [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax ¥ 15,985 $ 2,528 ¥ 18,081
Euro [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax 234 37 310
USD [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax ¥ 99 $ 16 3,526
Renminbi [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit before tax     ¥ (216)