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Reserves - Summary of Statutory Reserves (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Disclosure of reserves within equity [line items]      
Beginning balance ¥ 304,307    
Ending balance 307,165 $ 47,466 ¥ 304,307
Statutory general reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 278,601 43,052 276,698
Transfer from retained earnings 2,858 442 1,903
Ending balance 281,459 43,494 278,601
General surplus reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 25,706    
Ending balance 25,706 3,972 25,706
Capital reserves [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 30,704    
Ending balance ¥ 30,704 $ 4,745 ¥ 30,704