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PRINCIPAL ACCOUNTING POLICIES (Details 8) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2012 $ / shares shares | Sep. 30, 2015 shares | Sep. 30, 2014 shares | Dec. 31, 2014 shares | Oct. 17, 2007 shares | Nov. 05, 2004 shares
Stock options |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Number of options modified | 1,900,000 |  |  |  |  |
Stock options | Exercise price over $120.00 |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Lower limit for exercise prices of options modified (in dollars per share) | $ / shares | $ 120.00 |  |  |  |  |
Restricted stock units (RSUs) |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Restricted share units conversion ratio | 4 |  |  |  |  |
Ctrip 2005 Option Plan |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Number of ordinary shares reserved for future issuances of options |  |  |  |  |  | 3,000,000
Number of option outstanding under share incentive plans (in shares) |  | 188,420 |  | 386,310 |  |
Ctrip 2007 Incentive Plan |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Number of ordinary shares reserved for future issuances of options |  |  |  |  | 1,000,000 |
Annual increase of number of ordinary shares reserved under share incentive plans |  |  |  |  | 1,000,000 |
Number of restricted stock units considered for replacement under resolution passed by compensation committee | 518,017 |  |  |  |  |
Ctrip 2007 Incentive Plan | Stock options |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Number of options granted under share incentive plan |  | 625,006 | 803,189 |  |  |
Number of option outstanding under share incentive plans (in shares) |  | 4,917,329 |  | 4,585,868 |  |
Vesting period |  | 4 years |  |  |  |
Ctrip 2007 Incentive Plan | Restricted stock units (RSUs) |  |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |  |
Restriction period |  |  |  | 4 years |  |
Restricted stock units outstanding (in shares) |  | 919,864 |  | 1,058,608 |  |

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- Definition Represents the number of additional shares authorized under the entity's share-based compensation plan each year from 2008 through 2016. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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