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Revenue from contracts with customers - Performance Obligations (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service ¥ 209,773 $ 33,180 ¥ 179,723
Within one year [member]      
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service 140,601 22,239 112,454
More than one year [member]      
Disclosure of transaction price allocated to remaining performance obligations [line items]      
Total unfulfilled service-type maintenance service ¥ 69,172 $ 10,941 ¥ 67,269