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Share Capital - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2016
$ / shares
shares
Dec. 31, 2017
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
CNY (¥)
shares
Oct. 31, 2010
shares
Vote
Class of Stock [Line Items]            
Proceeds from issuance of ordinary shares | ¥     ¥ 2,548,695   ¥ 1,808,498  
Kingsoft            
Class of Stock [Line Items]            
Proceeds from issuance of ordinary shares | $       $ 172,012    
Xiaomi            
Class of Stock [Line Items]            
Proceeds from issuance of ordinary shares | $       50,000    
Esta Investments            
Class of Stock [Line Items]            
Proceeds from issuance of ordinary shares | $       $ 74,004    
Class A Ordinary Shares            
Class of Stock [Line Items]            
Entitled vote per ordinary share | Vote           1
Shares issued in settlement of contingent purchase considerations       13,098,599 13,098,599  
Business acquisition, shares issued 10,087,476          
Class A Ordinary Shares | Tuspark Innovation Venture Limited            
Class of Stock [Line Items]            
Business acquisition, shares issued 31,996,874          
Shares subscription price | $ / shares $ 2.712          
Class A Ordinary Shares | Kingsoft            
Class of Stock [Line Items]            
Issuance of new shares       39,087,125 39,087,125  
Class A Ordinary Shares | Xiaomi            
Class of Stock [Line Items]            
Issuance of new shares       6,142,410 6,142,410  
Class A Ordinary Shares | Esta Investments            
Class of Stock [Line Items]            
Issuance of new shares       24,668,022 24,668,022  
Class B Ordinary Shares            
Class of Stock [Line Items]            
Entitled vote per ordinary share | Vote           10
Conversion ratio, Class B ordinary share into Class A Ordinary Share           1
Class B Ordinary Shares | Tuspark Innovation Venture Limited            
Class of Stock [Line Items]            
Business acquisition, shares issued 111,053,390          
Shares subscription price | $ / shares $ 2.712          
Class B Ordinary Shares | Kingsoft            
Class of Stock [Line Items]            
Issuance of new shares       18,250,268 18,250,268  
Class B Ordinary Shares | Xiaomi            
Class of Stock [Line Items]            
Issuance of new shares       10,524,257 10,524,257  
American Depository Shares            
Class of Stock [Line Items]            
Business acquisition, shares issued   0 223,161 146,372 146,372  
American Depository Shares | Tuspark Innovation Venture Limited            
Class of Stock [Line Items]            
Shares subscription price | $ / shares $ 16.274