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Reserves - Summary of Statutory Reserves (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of reserves within equity [line items]      
Beginning balance [1]   ¥ 301,026  
Ending balance $ 45,202 302,404 ¥ 301,026 [1]
Statutory general reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 41,154 275,320 273,438
Transfer from retained earnings 206 1,378 1,882
Ending balance 41,360 276,698 275,320
General surplus reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 3,842 25,706 25,706
Ending balance $ 3,842 ¥ 25,706 ¥ 25,706
[1] Restated