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Share-Based Compensation - 2013 Incentive Scheme (Detail) - Restricted shares with an option feature - 2013 Incentive Scheme - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of shares    
Outstanding at the beginning of the year 48,967,051  
Granted 3,468,360  
Forfeited (5,009,400)  
Exercised (5,131,110)  
Outstanding at the end of the year 42,294,901 48,967,051
Vested and expected to vest at end of year | shares 42,294,901  
Exercisable | shares 20,073,089  
Weighted Average Exercise Price    
Outstanding at the beginning of the year (in dollars per share) $ 0.33  
Granted (in dollars per share) 0.34  
Forfeited (in dollars per share) 0.34  
Exercised (in dollars per share) 0.33  
Outstanding at the end of the year (in dollars per share) 0.33 $ 0.33
Weighted Average Grant Date Fair Value    
Outstanding at beginning of year (in dollars per share) 1.22  
Granted (in dollars per share) 0.60  
Forfeited (in dollars per share) 1.27  
Exercised (in dollars per share) 1.30  
Outstanding at end of year (in dollars per share) $ 1.15 $ 1.22
Weighted Average Remaining Contractual Term    
Outstanding 6 years 4 days 7 years 4 days
Aggregate Intrinsic Value    
Outstanding at the beginning of the year $ 30,438  
Outstanding at the end of the year $ 36,941  
Risk-free interest rates, minimum 2.78%  
Risk-free interest rates, maximum 2.99%  
Expected volatility range, minimum 56.10%  
Expected volatility range, maximum 57.50%  
Expected dividend yield 0.00%  
Expected exercise multiple 2.2  
Minimum [Member]    
Aggregate Intrinsic Value    
Fair value of ordinary share $ 0.84  
Fair value per option granted 0.53  
Maximum [Member]    
Aggregate Intrinsic Value    
Fair value of ordinary share 1.21  
Fair value per option granted $ 0.88