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Share-Based Compensation - Additional Information (Details)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
¥ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2018
¥ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2017
¥ / shares
shares
Dec. 31, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average grant date fair value of options granted | (per share)   $ 57.30 ¥ 396.37 $ 47.96 ¥ 388.45  
Options granted | shares 0          
Options exercised | shares 152,410 201,630 201,630 203,174 203,174  
Aggregate intrinsic value of options | ¥ ¥ 9,451          
Unrecognized compensation expense related to unvested share options | ¥ ¥ 34,027          
Unrecognized compensation expense, period for recognition 1 year 11 months 1 day          
Weighted average exercise price | ¥ / shares ¥ 208.36          
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense, period for recognition 2 years 3 months 18 days          
Total fair value of non-vested restricted shares | ¥ ¥ 64,955          
Unrecognized compensation expense related to non-vested restricted shares | ¥ ¥ 74,421          
Stock Incentive Plan 2010            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares that may be issued as a percentage of outstanding stock           10.00%
Maximum number of shares that may be issued | shares           2,315,000
Stock Incentive Plan 2010 | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock incentive plans, term           10 years
Vesting period for remaining the 75% of options granted           36 months
Stock Incentive Plan 2010 | Stock Options | First anniversary of the grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock incentive vesting ratably over the following 36 months           25.00%
Stock Incentive Plan 2010 | Stock Options | Vesting ratably over the following 36 months            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock incentive vesting ratably over the following 36 months           75.00%
Stock Incentive Plan 2017            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares that may be issued | shares       2,800,000 2,800,000  
Stock Incentive Plan 2017 | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock incentive plans, term       10 years 10 years  
Vesting period for remaining the 75% of options granted       36 months 36 months  
Stock Incentive Plan 2017 | Stock Options | First anniversary of the grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock incentive vesting ratably over the following 36 months       25.00% 25.00%  
Stock Incentive Plan 2017 | Stock Options | Vesting ratably over the following 36 months            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock incentive vesting ratably over the following 36 months       75.00% 75.00%