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DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Organization) (Details) - CNY (¥)
¥ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]          
Cash   ¥ 810,672 ¥ 513,938 ¥ 261,035 ¥ 159,368
Total current assets   1,450,858 1,326,918    
Property and equipment, net   437,337 127,864    
Long term investments   41,760 24,000    
Other non-current assets   91,849 53,111    
Total assets   2,085,012 1,653,891    
Income taxes payable   91,240 56,293    
Accrued expenses and other current liabilities   117,867 79,835    
Amounts due to related parties including amounts due to WOFE for accrued service fees   79 879    
Total current liabilities   479,749 305,944    
Other non-current liabilities   7,043 9,333    
Total liabilities   486,792 315,277    
Net revenues   1,579,604 1,178,008 836,941  
Net loss   241,854 178,760 151,850  
Net cash used in operating activities   524,030 347,698 175,343  
Net cash provided by (used in) investing activities   (156,449) (72,309) (734,539)  
Net cash provided by financing activities   (78,044) (26,899) 655,026  
Investment amount in PRC companies, which are engaged in provision of educational products and services   ¥ 35,000      
Equity Method Investments, Percentage of Equity Acquired through Options   100.00%      
Proceeds from Collection of Loans Receivable   ¥ 3,096 1,608 2,468  
Beijing Tarena Jinqiao Technology Co. Ltd. [Member]          
Variable Interest Entity [Line Items]          
Proceeds from Contributed Capital   ¥ 3,000      
Shanghai Tarena Software Technology Co., Ltd. [Member] | Subsequent Event [Member]          
Variable Interest Entity [Line Items]          
Proceeds from Collection of Loans Receivable ¥ 1,000        
Mr. Han [Member] | Tarena Entities [Member]          
Variable Interest Entity [Line Items]          
Equity Method Investment, Ownership Percentage   58.80%      
Mr. Li [Member] | Tarena Entities [Member]          
Variable Interest Entity [Line Items]          
Equity Method Investment, Ownership Percentage   12.20%      
Loan Agreements [Member] | Equity Holders [Member]          
Variable Interest Entity [Line Items]          
Debt Instrument, Face Amount   ¥ 6,000      
Debt Instrument, Initial Expiration Year   2026      
Beijing Tarena [Member]          
Variable Interest Entity [Line Items]          
Equity Method Investment Summarized Financial Information, Equity     2,000    
Shanghai Tarena [Member]          
Variable Interest Entity [Line Items]          
Equity Method Investment Summarized Financial Information, Equity     1,000    
Tarena Entities [Member]          
Variable Interest Entity [Line Items]          
Cash   ¥ 630 1,043    
Amounts due from related parties   21,650 25,109    
Total current assets   22,280 26,152    
Property and equipment, net   3 18    
Long term investments   35,000 18,000    
Other non-current assets   716 266    
Total assets   57,999 44,436    
Income taxes payable   3,729 3,737    
Accrued expenses and other current liabilities   176 892    
Amounts due to related parties including amounts due to WOFE for accrued service fees   46,486 39,307    
Total current liabilities   50,391 43,936    
Other non-current liabilities   267 267    
Total liabilities   50,658 44,203    
Net revenues   177 2,902  
Net loss   (892) (2,415) (14,542)  
Net cash used in operating activities   (2,166) (2,201) (4,252)  
Net cash provided by (used in) investing activities   (11,886) (18,000) 478  
Net cash provided by financing activities   ¥ 13,639 ¥ 19,755 ¥ 4,124