GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Jun. 13, 2014
Goodwill [Roll Forward]      
Goodwill at beginning of period   $ 3,291,366  
Goodwill at end of period 3,293,687 3,291,366  
Merchant Services      
Goodwill [Roll Forward]      
Goodwill at beginning of period   2,716,516  
Goodwill at end of period 2,718,837 2,716,516  
Financial Institution Services      
Goodwill [Roll Forward]      
Goodwill at beginning of period   574,850  
Goodwill at end of period 574,850 574,850  
Mercury Payment Systems, LLC      
Goodwill [Roll Forward]      
Goodwill at beginning of period     1,350,074
Goodwill attributable to acquisition 2,321    
Goodwill at end of period     1,350,074
Mercury Payment Systems, LLC | Merchant Services      
Goodwill [Roll Forward]      
Goodwill attributable to acquisition 2,321    
Mercury Payment Systems, LLC | Financial Institution Services      
Goodwill [Roll Forward]      
Goodwill attributable to acquisition $ 0