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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 03, 2014
Significant Accounting Policies [Line Items]        
Short-term investment ¥ 1,937,000 ¥ 945,000 ¥ 622,800  
Investment income 12,676 5,961 4,652  
Advertising costs 201,298 151,533 102,820  
Government grants 3,199 5,851 9,916  
Contributions to employee benefits 85,325 69,370 ¥ 51,510  
Deferred offering costs       ¥ 3,788
PRC [Member] | RMB Denominated Bank Deposits [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits 867,811 627,148    
PRC [Member] | US Dollar Denominated Bank Deposits [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits 152,792 52,680    
HK SAR [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits 3,535 645    
HK SAR [Member] | RMB Denominated Bank Deposits [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits 3 3    
HK SAR [Member] | HK Dollar Denominated Bank Deposits [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits 1 99    
US [Member] | RMB Denominated Bank Deposits [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits 0 547,388    
US [Member] | US Dollar Denominated Bank Deposits [Member]        
Significant Accounting Policies [Line Items]        
Cash, cash equivalents, time deposits and restricted time deposits ¥ 261,913 ¥ 55    
Office buildings [Member]        
Significant Accounting Policies [Line Items]        
Useful life 45 years      
Furniture [Member]        
Significant Accounting Policies [Line Items]        
Useful life 5 years      
Minimum [Member]        
Significant Accounting Policies [Line Items]        
Operating lease term 1 year      
Contributions to employee benefits, percentage of salary 22.30%      
Loan Referral Service Revenue, Percentage 5.00%      
Minimum [Member] | Office equipment [Member]        
Significant Accounting Policies [Line Items]        
Useful life 3 years      
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Operating lease term 10 years      
Contributions to employee benefits, percentage of salary 53.10%      
Loan Referral Service Revenue, Percentage 8.00%      
Maximum [Member] | Office equipment [Member]        
Significant Accounting Policies [Line Items]        
Useful life 4 years