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PRINCIPAL ACCOUNTING POLICIES - Summary of outstanding and exercisable options (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 $ / shares | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 $ / shares | Dec. 31, 2015 CNY (¥)
Share-based compensation disclosures by exercise price range |  |  |  |  |  |
Number of shares, outstanding | 4,710,758 |  |  |  |  |
Number of shares, exercisable | 2,951,517 |  |  |  |  |
Assumptions |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares | $ 376.78 |  | $ 140.95 |  | $ 109.93 |
Unrecognized compensation cost | $ | $ 262,000,000 |  |  |  |  |
Weighted average recognized period | 2 years 8 months 12 days | 2 years 8 months 12 days |  |  |  |
Proceeds from exercise of share options | $ 112,465,663 | ¥ 731,735,342 |  | ¥ 211,720,242 |  | ¥ 52,117,597
0.00 - 100.00 |  |  |  |  |  |
Share-based compensation disclosures by exercise price range |  |  |  |  |  |
Number of shares, outstanding | 1,671,410 |  |  |  |  |
Weighted-average exercise price, outstanding (in dollars per share) | $ / shares | $ 61.24 |  |  |  |  |
Weighted-average remaining contractual life (years), outstanding | 3 years 10 months 24 days | 3 years 10 months 24 days |  |  |  |
Number of shares, exercisable | 1,306,991 |  |  |  |  |
Weighted-average exercise price, exercisable (in dollars per share) | $ / shares | $ 78.31 |  |  |  |  |
Weighted-average remaining contractual life (years), exercisable | 2 years 11 months 5 days | 2 years 11 months 5 days |  |  |  |
100.01 - 200.00 |  |  |  |  |  |
Share-based compensation disclosures by exercise price range |  |  |  |  |  |
Number of shares, outstanding | 1,460,228 |  |  |  |  |
Weighted-average exercise price, outstanding (in dollars per share) | $ / shares | $ 155.54 |  |  |  |  |
Weighted-average remaining contractual life (years), outstanding | 3 years 10 months 2 days | 3 years 10 months 2 days |  |  |  |
Number of shares, exercisable | 1,128,628 |  |  |  |  |
Weighted-average exercise price, exercisable (in dollars per share) | $ / shares | $ 151.22 |  |  |  |  |
Weighted-average remaining contractual life (years), exercisable | 3 years 8 months 1 day | 3 years 8 months 1 day |  |  |  |
200.01 - 300.00 |  |  |  |  |  |
Share-based compensation disclosures by exercise price range |  |  |  |  |  |
Number of shares, outstanding | 664,262 |  |  |  |  |
Weighted-average exercise price, outstanding (in dollars per share) | $ / shares | $ 253.65 |  |  |  |  |
Weighted-average remaining contractual life (years), outstanding | 5 years 8 months 19 days | 5 years 8 months 19 days |  |  |  |
Number of shares, exercisable | 299,221 |  |  |  |  |
Weighted-average exercise price, exercisable (in dollars per share) | $ / shares | $ 250.70 |  |  |  |  |
Weighted-average remaining contractual life (years), exercisable | 5 years 8 months 9 days | 5 years 8 months 9 days |  |  |  |
300.01 - 400.00 |  |  |  |  |  |
Share-based compensation disclosures by exercise price range |  |  |  |  |  |
Number of shares, outstanding | 914,858 |  |  |  |  |
Weighted-average exercise price, outstanding (in dollars per share) | $ / shares | $ 324.87 |  |  |  |  |
Weighted-average remaining contractual life (years), outstanding | 6 years 10 months 17 days | 6 years 10 months 17 days |  |  |  |
Number of shares, exercisable | 216,677 |  |  |  |  |
Weighted-average exercise price, exercisable (in dollars per share) | $ / shares | $ 324.92 |  |  |  |  |
Weighted-average remaining contractual life (years), exercisable | 6 years 10 months 13 days | 6 years 10 months 13 days |  |  |  |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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