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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
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