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INTANGIBLE ASSETS - Amortization expense (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
INTANGIBLE ASSETS      
Amortization of intangible assets ¥ 391,000,000 ¥ 255,000,000 ¥ 58,000,000
Annual estimated amortization expense for intangible assets subject to amortization      
2018 396,364,608    
2019 390,594,774    
2020 374,512,943    
2021 218,578,855    
2022 174,564,565    
Total ¥ 1,554,615,745