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STOCK-BASED EMPLOYEE COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Activity of unvested restricted stock units and performance share units
The following table summarizes the activity of unvested restricted stock units ("RSUs") and performance share units during the years ended December 31, 2011, 2012 and 2013:
 
Share-Based Awards
 
Shares
Weighted Average  Grant
Date Fair Value
 
 
 
 
 
 
Unvested at December 31, 2010
 
1,530,647

 
$
130.93

 
 
 
 
 
 
 
Granted
 
125,564

 
$
469.29

 
Vested
 
(858,019
)
 
$
113.37

 
Performance Shares Adjustment
 
73,710

 
$
496.34

 
Forfeited
 
(71,922
)
 
$
182.90

 
Unvested at December 31, 2011
 
799,980

 
$
231.87

 
 
 
 
 
 
 
Granted
 
95,062

 
$
643.12

 
Vested
 
(353,819
)
 
$
108.31

 
Performance Shares Adjustment
 
6,649

 
$
532.26

 
Forfeited
 
(7,744
)
 
$
444.18

 
Unvested at December 31, 2012
 
540,128

 
$
389.21

 
 
 
 
 
 
 
Granted
 
162,341

 
$
730.47

 
Vested
 
(258,198
)
 
$
242.63

 
Performance Shares Adjustment
 
101,490

 
$
681.13

 
Forfeited
 
(11,442
)
 
$
579.71

 
Unvested at December 31, 2013
 
534,319

 
$
615.10

 
KAYAK [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of share-based compensation, stock options, activity
The following table summarizes for the year ended December 31, 2013 stock option activity for the vested and unvested employee stock options assumed in the acquisition of KAYAK:

Assumed Employee Stock Options
 
Number of Shares
 
Weighted Average
 Exercise Price
 
Aggregate
 Intrinsic Value (000's)
 
Weighted Average Remaining Contractual Term (in years)
Balance, May 21, 2013
 
540,179

 
 
$
260.96

 
 
$
314,133

 
6.8
Exercised
 
(387,669
)
 
 
$
222.73

 
 
 
 
 
Forfeited
 
(23,802
)
 
 
$
478.83

 
 
 
 
 
Balance, December 31, 2013
 
128,708

 
 
$
335.83

 
 
$
106,386

 
6.9
Vested and exercisable as of December 31, 2013
 
86,340

 
 
$
261.71

 
 
$
77,765

 
6.2
Vested and exercisable as of December 31, 2013 and expected to vest thereafter, net of estimated forfeitures
 
126,428

 
 
$
332.64

 
 
$
104,905

 
6.9
Schedule of share-based compensation, stock options, valuation assumptions
The following assumptions were used at the merger date to determine the fair value of the assumed options.

 
 
Weighted Average
 
Range
Risk-free interest rate
 
0.23
%
 
0.11% - 0.63%
Expected volatility
 
32
%
 
25% - 39%
Expected life (in years)
 
2.2

 
9 months - 4 years
Dividend yield
 
—
%