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Condensed Financial Information of the Parent Company - Schedule of Condensed Balance Sheet (Parenthetical) (Detail) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Oct. 20, 2017
Jun. 30, 2012
Consolidated Balance Sheet Statements Captions [Line Items]        
Ordinary stock, par value $ 0.00001   $ 0.00001 $ 0.00001
Ordinary stock, authorized       4,266,159,600
Ordinary stock, shares issued 1,550,071,169      
Class A Ordinary Shares [Member]        
Consolidated Balance Sheet Statements Captions [Line Items]        
Ordinary stock, par value $ 0.00001 $ 0.00001    
Ordinary stock, authorized 10,000,000,000 10,000,000,000    
Ordinary stock, shares issued 964,071,169 874,071,169    
Ordinary Stock, shares outstanding 943,436,904 827,770,169    
Class B Ordinary Shares [Member]        
Consolidated Balance Sheet Statements Captions [Line Items]        
Ordinary stock, par value $ 0.00001 $ 0.00001    
Ordinary stock, authorized 10,000,000,000 10,000,000,000    
Ordinary stock, shares issued 586,000,000 659,000,000    
Ordinary Stock, shares outstanding 586,000,000 659,000,000    
Parent Company [Member]        
Consolidated Balance Sheet Statements Captions [Line Items]        
Treasury stock,shares 20,634,265 46,301,000    
Parent Company [Member] | Class A Ordinary Shares [Member]        
Consolidated Balance Sheet Statements Captions [Line Items]        
Ordinary stock, par value $ 0.00001 $ 0.00001    
Ordinary stock, authorized 10,000,000,000 10,000,000,000    
Ordinary stock, shares issued 964,071,169 874,071,169    
Ordinary Stock, shares outstanding 943,436,904 827,770,169    
Parent Company [Member] | Class B Ordinary Shares [Member]        
Consolidated Balance Sheet Statements Captions [Line Items]        
Ordinary stock, par value $ 0.00001 $ 0.00001    
Ordinary stock, authorized 10,000,000,000 10,000,000,000    
Ordinary stock, shares issued 586,000,000 659,000,000    
Ordinary Stock, shares outstanding 586,000,000 659,000,000