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Shareholders' Equity - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
$ / shares
shares
May 31, 2014
$ / shares
shares
Class of Stock [Line Items]          
Ordinary shares, shares authorized         10,000,000,000
Allocations to general reserve as a percentage of profit after tax 10.00%        
Threshold percentage of general reserve required to be maintained threshold percentage of general reserve required to be maintained 50.00%        
Appropriation to statutory common reserve 10.00%        
Threshold percentage of statutory common reserve required to be maintained 50.00%        
Net assets restricted to transfer ¥ 1,264,954     $ 194,420  
Other comprehensive income, tax expense or benefit | ¥ ¥ 0 ¥ 0 ¥ 0    
Common Class A [Member]          
Class of Stock [Line Items]          
Ordinary shares, shares authorized 7,600,000,000 7,600,000,000   7,600,000,000  
Ordinary shares, par value (in dollars per share) | $ / shares       $ 0.000025  
Ordinary shares, shares outstanding 409,345,857 380,922,773   409,345,857  
Common Class B [Member]          
Class of Stock [Line Items]          
Shares transferred 13,749,910 43,385,700      
Ordinary shares, shares authorized 1,400,000,000 1,400,000,000   1,400,000,000  
Ordinary shares, par value (in dollars per share) | $ / shares       $ 0.000025  
Ordinary shares, shares outstanding 992,705,325 1,003,326,973   992,705,325  
Reserved Shares          
Class of Stock [Line Items]          
Ordinary shares, shares authorized         1,000,000,000
Ordinary shares, par value (in dollars per share) | $ / shares         $ 0.000025