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Reserves - Summary of Statutory Reserves (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Disclosure of reserves within equity [line items]      
Beginning balance ¥ 307,165    
Ending balance 309,237 $ 48,913 ¥ 307,165
Statutory general reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 281,459 44,519 278,601
Transfer from retained earnings 2,072 328 2,858
Ending balance 283,531 44,847 281,459
General surplus reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 25,706    
Ending balance 25,706 4,066 25,706
Capital reserves [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 30,704    
Ending balance ¥ 30,704 $ 4,857 ¥ 30,704