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INVESTMENTS - Homeinns and BTG (Details) | 1 Months Ended | 12 Months Ended
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Dec. 31, 2016 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Equity method investment disclosures |  |  |  |  |
Equity in income / (loss) of affiliates |  | $ (10,008,156) | ¥ (65,116,066) | ¥ 601,883,179 | ¥ (135,780,312)
Carrying value of investments under equity method | ¥ 4,114,199,782 |  | 6,068,391,137 | ¥ 4,114,199,782 |
BTG |  |  |  |  |
Equity method investment disclosures |  |  |  |  |
Equity method investment, ownership interest (as a percent) | 22.00% |  |  | 22.00% |
Equity in income / (loss) of affiliates | ¥ 1,400,000,000 |  |  |  |
Homeinns and BTG |  |  |  |  |
Equity method investment disclosures |  |  |  |  |
Carrying value of investments under equity method | ¥ 2,500,000,000 |  | ¥ 2,600,000,000 | ¥ 2,500,000,000 |

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