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Share-Based Compensation - Summary of Company's Employee Share Option Activity (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
CNY (¥)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Number of options, Outstanding, Beginning balance | shares 2,595,065 2,595,065      
Number of options, Granted | shares 4,742,500 4,742,500      
Number of options, Exercised | shares (1,632,223) (1,632,223)      
Number of options, Forfeited | shares (2,883,750) (2,883,750)      
Number of options, Outstanding, Ending balance | shares 2,821,592 2,821,592 2,595,065 2,595,065  
Number of options, Vested and expected to vest, Ending balance | shares   2,739,893      
Number of options, Exercisable, Ending balance | shares   735,609      
Weighted average exercise price, Outstanding, Beginning balance   $ 2.20      
Weighted average exercise price, Granted   23.85      
Weighted average exercise price, Exercised   2.20      
Weighted average exercise price, Forfeited   23.66      
Weighted average exercise price, Outstanding, Ending balance   16.66   $ 2.20  
Weighted average exercise price, Vested or expected to vest   16.48      
Weighted average exercise price, Exercisable   2.20      
Weighted average grant date fair value, Outstanding, Beginning balance   5.00      
Weighted average grant date fair value, Outstanding, Ending balance   11.87   $ 5.00  
Weighted average grant date fair value, Vested or expected to vest   11.79      
Weighted average grant date fair value, Exercisable   $ 4.93      
Weighted average remaining contractual term 8 years 1 month 24 days 8 years 1 month 24 days 6 years 2 months 16 days 6 years 2 months 16 days  
Weighted average remaining contractual term, Vested or expected to vest 8 years 1 month 13 days 8 years 1 month 13 days      
Weighted average remaining contractual term, Exercisable 5 years 2 months 27 days 5 years 2 months 27 days      
Aggregate intrinsic value of share options, Outstanding, Beginning balance | $   $ 84,911      
Exercised ¥ 246,754 35,540 ¥ 623,605   ¥ 693,878
Aggregate intrinsic value of share options, Outstanding, Ending balance | $   24,329   $ 84,911  
Aggregate intrinsic value of share options, Vested or expected to vest | $   24,102      
Aggregate intrinsic value of share options, Exercisable | $   $ 16,978