ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (3,768) $ 264    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (212)      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax (11,435) (2,599)    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 3,329 704    
Unrealized gain (loss) on cash flow hedges (8,106) (1,895)    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 1,041 335    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax (305) (93)    
Unrealized gain on hedging activities, net of tax 736 242    
Pretax activity (10,394) (2,264)    
Tax effect 3,024 611    
Net activity (7,370) (1,653)    
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest (5,632) (12,379)    
Comprehensive income attributable to Vantiv, Inc. 13,994 27,059    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (212)      
Accumulated Other Comprehensive Income (Loss), Net of Tax (8,763) (813)    
Non-Controlling Interests        
Other Comprehensive Income (Loss), Unrealized Gain (Loss), Net of Tax 2,612 663    
Other Comprehensive Income (Loss) Reclassification Adjustment, Net of Tax (237) (87)    
Net activity (2,375) (576)    
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest 2,375 576    
Vantiv, Inc.        
Other Comprehensive Income (Loss), Unrealized Gain (Loss), Net of Tax (5,494) (1,232)    
Other Comprehensive Income (Loss) Reclassification Adjustment, Net of Tax 499 155    
Comprehensive income attributable to Vantiv, Inc. (4,995) (1,077)    
Accumulated Net Gain (Loss) from Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax     (5,288) (5)
Accumulated Other Comprehensive Income (Loss), Net of Tax (10,782) (1,237) (5,288) (5)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss), Net of Tax     1,732 269
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,231 $ 424 $ 1,732 $ 269