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ACQUISITION AND DISPOSAL OF SUBSIDIARIES - Additional Information (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 24, 2019
USD ($)
Dec. 24, 2019
CNY (¥)
Aug. 20, 2019
Jan. 02, 2019
USD ($)
Jan. 02, 2019
CNY (¥)
Aug. 31, 2019
Dec. 31, 2017
CNY (¥)
Sep. 30, 2017
CNY (¥)
subsidiary
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Aug. 19, 2019
Mar. 31, 2017
Mar. 14, 2017
Dec. 31, 2012
CNY (¥)
Business Acquisition [Line Items]                                  
Total cash consideration                 $ 11,857 ¥ 82,536,000 ¥ 13,000,000            
Contingent consideration                                 ¥ 47,755,000
Number of wholly owned subsidiaries | subsidiary               6                  
Impairment losses of long-lived assets                   ¥ 0 ¥ 0 ¥ 401,808,000          
Impairment losses of goodwill                       766,440,000          
Gain on disposal of subsidiaries                       497,036,000          
WiFire Group Inc. ("WiFire Group")                                  
Business Acquisition [Line Items]                                  
Equity interest transferred               66.67%                  
Consideration price               ¥ 6                  
Cumulative Percentage Ownership after restructuring (as a percentage)               33.33%                  
Aipu Group                                  
Business Acquisition [Line Items]                                  
Consideration price               ¥ 1                  
Number of shares transferred | shares               2                  
Ownership percentage before transaction               50.00%                  
Tibet Xingtao Culture Communications Co., Ltd. [Member]                                  
Business Acquisition [Line Items]                                  
Equity interest transferred             50.00%                    
Consideration price             ¥ 1         ¥ 1          
Beijing Shuhai Data Technology Co., Ltd ("BJ Shuhai")                                  
Business Acquisition [Line Items]                                  
Percentage of equity interests acquired       100.00% 100.00%                        
Total cash consideration       $ 14,113 ¥ 98,255,000                        
Contingent consideration                 $ 4,309       ¥ 30,000,000        
Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")                                  
Business Acquisition [Line Items]                                  
Equity interest (as a percentage)                           49.00% 49.00%    
Nantong Chenghong Cloud Computing Co., Ltd. ("NT Chenghong")                                  
Business Acquisition [Line Items]                                  
Percentage of equity interests acquired 100.00% 100.00%                              
Total cash consideration $ 11,491 ¥ 80,000,000                              
Warburg Pincus                                  
Business Acquisition [Line Items]                                  
Percentage of ownership interest (as a percent)                             49.00% 49.00%  
Warburg Pincus | Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")                                  
Business Acquisition [Line Items]                                  
Equity interest (as a percentage)                             51.00%    
Percentage of equity interest transferred     100.00%     100.00%