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Significant Accounting Judgments, Estimates and Assumptions - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jan. 01, 2017
CNY (¥)
 [1]
Disclosure of changes in accounting estimates [line items]          
Carrying amounts of deferred tax assets $ 53,991   ¥ 315,390 [1] ¥ 361,207 ¥ 282,212
Increase in profit if all unrecognized deferred tax asset were recognized 23,900 ¥ 160,000 182,700    
Carrying amounts of inventory provision $ 14,000   ¥ 106,900 ¥ 93,600  
Bottom of range [member]          
Disclosure of changes in accounting estimates [line items]          
Cash flows derived from forecasts period 8 years 8 years      
Top of range [member]          
Disclosure of changes in accounting estimates [line items]          
Cash flows derived from forecasts period 15 years 15 years      
[1] Restated