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Ordinary shares and treasury stock - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 10, 2017
CNY (¥)
shares
Nov. 10, 2017
USD ($)
$ / shares
shares
Jun. 30, 2012
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
CNY (¥)
Oct. 20, 2017
$ / shares
Class of Stock [Line Items]                  
Authorized share capital | $     $ 50,000            
Ordinary and preferred shares authorized     5,000,000,000            
Ordinary stock, authorized     4,266,159,600            
Ordinary stock, par value | $ / shares     $ 0.00001   $ 0.00001       $ 0.00001
Preferred stock, shares authorized     733,840,400            
Common stock shares redesignated     4,000,000            
Issuance of ordinary shares upon Initial Public Offering ("IPO") and Concurrent Private Placement ("CPP"), net of expense | ¥               ¥ 1,677,222  
Ordinary stock, shares issued         1,550,071,169        
Stock Repurchased, Value | ¥       ¥ 47,173   ¥ 452,262      
Treasury Stock [Member]                  
Class of Stock [Line Items]                  
Issuance of ordinary shares for share-based compensation plans       (17,000,000) (17,000,000) (30,000,000) (30,000,000)    
Stock repurchased, Shares       (12,729,500) (12,729,500) (60,306,360) (60,306,360)    
Stock Repurchased, Value | ¥       ¥ 47,173   ¥ 452,262      
Exercise of share-based compensation plans, shares       55,396,235 55,396,235 44,005,360 44,005,360    
Shares not in use and not outstanding         20,634,265   46,301,000    
Class A Ordinary Shares [Member]                  
Class of Stock [Line Items]                  
Ordinary stock, authorized         10,000,000,000   10,000,000,000    
Ordinary stock, par value | $ / shares         $ 0.00001   $ 0.00001    
Preferred stock shares converted and designated     1            
Common stock shares redesignated     1            
Ordinary stock, shares issued         964,071,169   874,071,169    
Issuance of ordinary shares for share-based compensation plans       17,000,000 17,000,000 30,000,000 30,000,000    
Stock repurchased, Shares       12,729,500 12,729,500 60,306,360 60,306,360    
Stock Repurchased, Value       ¥ 47,173 $ 6,802 ¥ 452,262 $ 67,622    
Weighted Average Price per shares | $ / shares         $ 0.53   $ 1.12    
Class B Ordinary Shares [Member]                  
Class of Stock [Line Items]                  
Ordinary stock, authorized         10,000,000,000   10,000,000,000    
Ordinary stock, par value | $ / shares         $ 0.00001   $ 0.00001    
Preferred stock shares converted and designated     1            
Ordinary stock, shares issued         586,000,000   659,000,000    
Ordinary stock, shares sold       73,000,000 73,000,000 2,000,000 2,000,000    
IPO [Member] | Class A Ordinary Shares [Member]                  
Class of Stock [Line Items]                  
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " 85,000,000 85,000,000              
Common stock shares sold price per share | $ / shares   $ 2.6              
Issuance of ordinary shares upon Initial Public Offering ("IPO") and Concurrent Private Placement ("CPP"), net of expense ¥ 1,464,800 $ 221,000              
IPO [Member] | American Depositary Shares [Member]                  
Class of Stock [Line Items]                  
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " 17,000,000 17,000,000              
Common stock shares sold price per share | $ / shares   $ 13.0              
Private Placement [Member] | Class A Ordinary Shares [Member]                  
Class of Stock [Line Items]                  
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " 19,230,769 19,230,769              
Issuance of ordinary shares upon Initial Public Offering ("IPO") and Concurrent Private Placement ("CPP"), net of expense ¥ 331,400 $ 50,000              
Private Placement [Member] | American Depositary Shares [Member]                  
Class of Stock [Line Items]                  
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " 3,846,154 3,846,154