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PRINCIPAL ACCOUNTING POLICIES (Details 8) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 31, 2012 Stock options | Feb. 28, 2010 Stock options | Dec. 31, 2009 Stock options | Feb. 28, 2009 Stock options | Dec. 31, 2008 Stock options | Dec. 31, 2007 Stock options | Dec. 31, 2010 Stock options | Jan. 31, 2012 Stock options Exercise price over $120.00 | Feb. 28, 2009 Stock options Minimum | Feb. 28, 2009 Stock options Maximum | Jan. 31, 2012 Restricted stock units (RSUs) | Dec. 31, 2013 Ctrip 2005 Option Plan | Dec. 31, 2012 Ctrip 2005 Option Plan | Nov. 05, 2004 Ctrip 2005 Option Plan | Dec. 31, 2013 Ctrip 2007 Incentive Plan | Oct. 17, 2007 Ctrip 2007 Incentive Plan | Dec. 31, 2013 Ctrip 2007 Incentive Plan Stock options | Dec. 31, 2012 Ctrip 2007 Incentive Plan Stock options | Dec. 31, 2013 Ctrip 2007 Incentive Plan Restricted stock units (RSUs) | Dec. 31, 2012 Ctrip 2007 Incentive Plan Restricted stock units (RSUs)
Share-based compensation disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares reserved for future issuances of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  | 1,000,000 |  |  |  |
Number of option outstanding under share incentive plans (in shares) | 4,130,732 | 3,919,535 | 5,433,541 | 4,414,481 |  |  |  |  |  |  |  |  |  |  |  | 587,596 | 829,409 |  |  |  | 3,543,136 | 3,090,126 |  |
Annual increase of number of ordinary shares reserved under share incentive plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years | 3 years |  |  |  |  |  |  |  |  |  |  | 4 years |  | 4 years |
Restriction period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |
Restricted stock units outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 623,424 | 646,301
Number of options modified |  |  |  |  | 1,900,000 | 2,800,000 |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to modification of options |  |  |  |  |  | $ 2.7 | $ 2.6 | $ 15.0 |  |  | $ 2.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of modified options |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  |  |  |  |  |  |
Number of unvested options modified by extension of expiration date |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vested options modified by extension of expiration date |  |  |  |  |  | 500,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lower limit for exercise prices of options modified (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 120.00 |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock units considered for replacement under resolution passed by compensation committee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 518,017 |  |  |  |  |
Restricted share units conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |

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- Definition Represents the number of unvested options modified to extend the expiration date. + References No definition available. + Details
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- Definition Represents the number of vested options modified to extend the expiration date. + References No definition available. + Details
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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 Description of the period of time over which an employee's right to exercise an award is restricted. + References No definition available. + Details
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- Definition Represents the excess of the fair value of the modified award over the fair value of the award immediately before modification, which will be recognized as compensation cost over the vesting period of the modified awards. + 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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