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Revenue from contracts with customers - Performance Obligations (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service ¥ 195,245 $ 28,085 ¥ 209,773
Within one year [member]      
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service 117,906 16,960 140,601
More than one year [member]      
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service ¥ 77,339 $ 11,125 ¥ 69,172