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PRINCIPAL ACCOUNTING POLICIES - Foreign Currencies, Cash and Restricted Cash, Investments (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended 24 Months Ended
Sep. 30, 2016
CNY (¥)
Dec. 31, 2019
USD ($)
$ / ¥
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
company
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
CNY (¥)
$ / ¥
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2016
CNY (¥)
Foreign Currencies                    
Exchange rate used for conversion of RMB into U.S. dollars in the financial statements | $ / ¥   6.9618         6.9618      
Cash and Restricted Cash                    
Cash   $ 329,642         ¥ 2,294,904   ¥ 1,968,351  
Restricted cash   9,505         66,169   5,770  
Total cash and restricted cash   339,147     ¥ 2,292,725   2,361,073 $ 283,565 1,974,121 ¥ 1,921,463
Investments                    
Change in fair value of equity securities with readily determinable fair values   6,092 ¥ 42,410              
Other-than-temporary impairment charge     0 ¥ 0 0          
Qualifying observable price changes     0 0 ¥ 0          
USD                    
Cash and Restricted Cash                    
Amount of cash and restricted cash held in U.S. dollars   $ 76,726         ¥ 535,254 $ 135,668 931,120  
Equity Method Investments                    
Investments                    
Amount paid for investments     25,000 25,000            
Other-than-temporary impairment charge on equity method investment     0 ¥ 0            
Huali University Group Limited                    
Investments                    
Equity interest acquired (as a percent)   5.70%         5.70%      
Cost of equity securities with readily determinable fair values             ¥ 201,558      
Fair value of equity securities with readily determinable fair values             159,148      
Change in fair value of equity securities with readily determinable fair values     42,410              
Investment in a provider of on-demand work opportunities in the United States                    
Investments                    
Other-than-temporary impairment charge     ¥ 98,277              
Technology talent assessment services provider in the United States                    
Investments                    
Equity interest                 ¥ 31,535  
Percentage of equity interest owned               14.30% 14.30%  
Human resource consulting and executive search services company in China                    
Investments                    
Equity interest                 ¥ 25,000  
Percentage of equity interest owned               18.00% 18.00%  
Companies that provide business process outsourcing services in China                    
Investments                    
Equity interest             ¥ 200   ¥ 300  
Percentage of equity interest owned   5.00%         5.00% 5.00% 5.00%  
Number of companies | company       3            
CDP Holdings, Ltd.                    
Investments                    
Equity interest             ¥ 565,664      
Percentage of equity interest owned   17.50%         17.50%      
Provider of tools and solutions powered by artificial intelligence                    
Investments                    
Equity interest             ¥ 78,000      
Percentage of equity interest owned   19.50%         19.50%      
Recruiting platform that focuses on gig and hourly services workers within the on-demand labor market in the United States                    
Investments                    
Equity interest             ¥ 20,157      
Percentage of equity interest owned   3.00%         3.00%      
Investment fund | Equity Method Investments                    
Investments                    
Amount paid for investments       ¥ 75,000            
Ownership interest (as a percent)               5.00% 5.00%  
Another Investment Fund | Equity Method Investments                    
Investments                    
Amount paid for investments           ¥ 50,000        
Ownership interest (as a percent)               25.00% 25.00%  
Golden Finance                    
Investments                    
Available-for-sale debt securities ¥ 126,716                  
Available-for-sale debt securities, percentage of equity interest 15.00% 11.70%         11.70%      
Realized gain on sale of debt securities       ¥ 61,070