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PRINCIPAL ACCOUNTING POLICIES (Details 15) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2013 USD ($) shares | Sep. 30, 2015 USD ($) item shares | Sep. 30, 2015 CNY (¥) shares | Sep. 30, 2014 CNY (¥) | Dec. 31, 2014 USD ($) item shares | Sep. 30, 2015 CNY (¥) item shares | Dec. 31, 2014 CNY (¥) shares | Apr. 03, 2014 USD ($) | Jun. 13, 2012 USD ($) | Sep. 29, 2011 USD ($) | Sep. 30, 2008 USD ($) | Jul. 30, 2008 USD ($)
Treasury stock disclosures |  |  |  |  |  |  |  |  |  |  |  |
Approved repurchase plan | $ |  |  |  |  |  |  |  | $ 600,000,000 | $ 300,000,000 | $ 100,000,000 | $ 15,000,000 | $ 15,000,000
Cost of repurchased shares | ¥ |  |  | ¥ 834,688,738 | ¥ 446,155,147 |  |  |  |  |  |  |  |
Conversion of convertible senior notes |  | $ 4,195,944 | ¥ 26,667,740 | ¥ 110,815,452 |  |  |  |  |  |  |  |
Treasury stock, shares | shares |  | 3,742,219 |  |  |  | 3,742,219 | (3,323,262) |  |  |  |  |
Treasury stock at cost |  | $ 380,180,296 |  |  |  | ¥ 2,416,273,887 | ¥ 1,605,630,913 |  |  |  |  |
Segment reporting disclosures |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  | 1 |  |  |  |  |  |  |
2012 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock disclosures |  |  |  |  |  |  |  |  |  |  |  |
Stock issued to bond holders | shares | 588,219 | 55,590 | 55,590 |  | 846,131 |  |  |  |  |  |  |
ADS |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock disclosures |  |  |  |  |  |  |  |  |  |  |  |
Number of share repurchase plans | item |  | 3 |  |  |  | 3 |  |  |  |  |  |
Number of shares repurchased | shares |  | 3,742,219 | 3,742,219 |  |  |  |  |  |  |  |  |
Cost of repurchased shares | $ |  | $ 380,000,000 |  |  |  |  |  |  |  |  |  |
ADS | 2012 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock disclosures |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible senior notes | $ | $ 45,500,000 | $ 4,300,000 |  |  | $ 65,500,000 |  |  |  |  |  |  |

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