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Issued capital - Summary of Issued Capital (Detail)
¥ in Thousands, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2019
USD ($)
shares
Disclosure of classes of share capital [line items]        
Ending balance ¥ 2,081,138 $ 293,734 ¥ 2,081,138  
Ordinary shares issued and fully paid        
Ending balance     40,858,290  
Equity        
Ending balance ¥ 2,081,138 $ 293,734 ¥ 2,081,138  
One special share issued and fully paid at US$0.10 per share Less than RMB 1 thousand(US$1 thousand) Less than RMB 1 thousand(US$1 thousand) Less than RMB 1 thousand(US$1 thousand)  
Non-redeemable convertible cumulative preference shares  
Ordinary shares [member]        
Disclosure of classes of share capital [line items]        
Ordinary share of par value US$0.10 each 100,000   100,000 100,000