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STOCK-BASED EMPLOYEE COMPENSATION (Details Summary) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation Expense and Related Tax Benefit      
Stock-based compensation $ 140,526,000 $ 71,565,000 $ 65,724,000
Share-based compensation, cumulative charges for adjustment of the estimated probable outcome on unvested performance awards 24,100,000 900,000 10,300,000
Stock-based compensation cost, non-employee directors 2,100,000 1,800,000 1,700,000
Stock-based compensation - related tax benefit $ 18,500,000 $ 7,600,000 $ 8,100,000
Stock Option Awards
     
Stock-Based Compensation, Award Terms      
Grant term (in years) 10 years    
Awards Other Than Options [Member] | Minimum [Member]
     
Stock-Based Compensation, Award Terms      
Vesting period (in years) 1 year    
Awards Other Than Options [Member] | Maximum [Member]
     
Stock-Based Compensation, Award Terms      
Vesting period (in years) 4 years    
1999 Plan
     
Stock-Based Compensation, Award Terms      
Shares available to be issued under the plan (in shares) 2,807,340    
KAYAK 2012 Equity Incentive Plan [Member]
     
Stock-Based Compensation, Award Terms      
Shares available to be issued under the plan (in shares) 31,946    
Performance Share Units 2012 Grants [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award      
Estimated number of probable shares to be issued (in shares) 97,204    
Minimum shares that could be issued (in shares) 36,250    
Performance Share Units 2011 Grants [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award      
Estimated number of probable shares to be issued (in shares) 149,345