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Intangible Assets - Summary of Intangible Assets (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance ¥ 418,637    
Amortization 1,012 $ 143  
Intangible assets and goodwill ending balance 954,144 134,669 ¥ 418,637
Technology Know-how [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 10,122    
Intangible assets and goodwill ending balance 9,110 1,286 10,122
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 195,879    
Intangible assets and goodwill ending balance 562,587 79,404 195,879
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 212,636    
Intangible assets and goodwill ending balance 212,636 30,012 212,636
Trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill ending balance 169,811 $ 23,967  
Cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 551,012   355,133
Addition 536,519    
Intangible assets and goodwill ending balance 1,087,531   551,012
Cost [member] | Internally generated [member]      
Disclosure of detailed information about intangible assets [line items]      
Addition     195,879
Cost [member] | Technology Know-how [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 136,822    
Addition 0    
Reclassification     136,822
Intangible assets and goodwill ending balance 136,822   136,822
Cost [member] | Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 195,879   136,822
Addition 366,708    
Reclassification     (136,822)
Intangible assets and goodwill ending balance 562,587   195,879
Cost [member] | Development costs [member] | Internally generated [member]      
Disclosure of detailed information about intangible assets [line items]      
Addition     195,879
Cost [member] | Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 218,311   218,311
Intangible assets and goodwill ending balance 218,311   218,311
Cost [member] | Trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Addition 169,811    
Intangible assets and goodwill ending balance 169,811    
Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 132,375   132,375
Amortization 1,012    
Intangible assets and goodwill ending balance 133,387   132,375
Accumulated depreciation, amortisation and impairment [member] | Technology Know-how [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 126,700    
Reclassification     126,700
Amortization 1,012    
Intangible assets and goodwill ending balance 127,712   126,700
Accumulated depreciation, amortisation and impairment [member] | Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance     126,700
Reclassification     (126,700)
Intangible assets and goodwill ending balance 0    
Accumulated depreciation, amortisation and impairment [member] | Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill beginning balance 5,675   5,675
Intangible assets and goodwill ending balance ¥ 5,675   ¥ 5,675