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Reserves - Summary of Statutory Reserves (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Disclosure of reserves within equity [line items]      
Beginning balance ¥ 302,404    
Ending balance 304,307 $ 42,950 ¥ 302,404
Statutory general reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 276,698 39,053 275,320
Transfer from retained earnings 1,903 269 1,378
Ending balance 278,601 39,322 276,698
General surplus reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 25,706    
Ending balance 25,706 3,628 25,706
Capital reserves [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 30,704    
Ending balance ¥ 30,704 $ 4,334 ¥ 30,704