CONTROLLING AND NON-CONTROLLING INTERESTS IN VANTIV HOLDING (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2009
May 31, 2014
Dec. 31, 2014
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]          
Net income $ 26,996,000 $ 41,091,000      
Items not allocable to non-controlling interests:          
Net income attributable to non-controlling interests 8,007,000 12,955,000      
People’s United Merchant Services          
Changes in units and related ownership interest          
Opening percentage of ownership by parent       51.00%  
Closing percentage of ownership by parent       51.00%  
Vantiv Holding          
Changes in units and related ownership interest          
Balance (in shares) 188,497,834        
Opening percentage of ownership by parent 77.17%        
Equity Plan Activity, Shares 499,693        
Balance (in shares) 188,997,527        
Closing percentage of ownership by parent 77.23%        
Adjustment to net assets attributable to non-controlling interest as a result of change in ownership interest 2,700,000        
Vantiv, Inc.          
Items not allocable to non-controlling interests:          
Vantiv, Inc. expenses 7,810,000 9,192,000      
Vantiv, Inc. | Vantiv Holding          
Changes in units and related ownership interest          
Balance (in shares) 145,455,008        
Equity Plan Activity, Shares 499,693        
Balance (in shares) 145,954,701        
Warrant | Fifth Third          
Changes in units and related ownership interest          
Price per unit minus exercise price threshold restriction     $ 0    
Warrant price (in dollars per share)     $ 15.98    
Warrant fair value     65,400,000    
Vantiv Holding          
Items not allocable to non-controlling interests:          
Net income attributable to Vantiv Holding 34,806,000 50,283,000      
Net income attributable to non-controlling interests 8,007,000 12,955,000      
Vantiv Holding | Peoples United Bank          
Items not allocable to non-controlling interests:          
Net income attributable to non-controlling interests 104,000 0      
Vantiv Holding | Fifth Third          
Items not allocable to non-controlling interests:          
Net income attributable to non-controlling interests $ 7,903,000 $ 12,955,000      
Peoples United Bank | People’s United Merchant Services          
Changes in units and related ownership interest          
Opening percentage of ownership, non-controlling interest       49.00%  
Closing percentage of ownership, non-controlling interest       49.00%  
Fifth Third | Vantiv Holding          
Changes in units and related ownership interest          
Balance (in shares)         43,042,826
Opening percentage of ownership, non-controlling interest         22.83%
Balance (in shares) 43,042,826       43,042,826
Closing percentage of ownership, non-controlling interest 22.77%       22.83%
Class C Non-Voting Units | Vantiv Holding | Warrant | Fifth Third          
Changes in units and related ownership interest          
Warrants issued (in shares)     20,400,000