Equity Redemption, Refinancing and Change in Control (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
May 31, 2009
Jun. 30, 2012
May 23, 2011
May 06, 2011
Apr. 12, 2011
Equity Redemption Refinancing and Change in Control (Textual) [Abstract]          
Fair value of trade name   $ 65.5      
Increase in the amount of goodwill   141.5      
Equity Redemption Refinancing and Change in Control (Additional Textual) [Abstract]          
Verdict amount handed by Superior Court of the State of California 300.0        
Punitive damages ordered by Superior Court of State of California 50.0        
Percentage of outstanding equity         65.80%
Aggregate price of outstanding equity         118.5
Completion of offering of Senior notes       10.25%  
Redemption agreement including covenants   1 year      
Number of years during not to solicit associated persons   3 years      
Agreement terms and conditions     The Redemption Agreement includes covenants on the part of Mr. Daily not to compete with iPayment and its affiliates for one year, and not to solicit employees, independent sales agents and independent sales organizations and merchants of iPayment and its affiliates for three years, in each case from May 23, 2011, the closing date of the Equity Redemption.    
Increase in goodwill from the acquisition of Flagship   9.1      
Measurement period adjustment for goodwill   0.6      
Merchant Processing Portfolios [Member]
         
Equity Redemption Refinancing and Change in Control (Textual) [Abstract]          
Increase in the amount of merchant portfolios and other intangible assets   131.8      
iPayment Inc and Subsidiaries [Member]
         
Equity Redemption Refinancing and Change in Control (Textual) [Abstract]          
Fair value of goodwill   669.5      
Fair value of merchant portfolios   206.4      
Fair value of trade name   65.5      
Fair value of software development and other intangible assets.   2.6      
Deferred tax liabilities on the cumulative step-up of assets and liabilities   32.8      
Goodwill   678.2      
iPayment Inc and Subsidiaries [Member] | Merchant Processing Portfolios [Member]
         
Equity Redemption Refinancing and Change in Control (Textual) [Abstract]          
Fair value of merchant portfolios and other intangible assets   274.5      
iPayment Holdings Inc and Subsidiaries [Member]
         
Equity Redemption Refinancing and Change in Control (Textual) [Abstract]          
Fair value of goodwill   670.3      
Fair value of merchant portfolios   206.4      
Fair value of software development and other intangible assets.   2.6      
Increase in the amount of goodwill   142.3      
Deferred tax liabilities on the cumulative step-up of assets and liabilities   32.8      
Goodwill   679.0      
iPayment Holdings Inc and Subsidiaries [Member] | Merchant Processing Portfolios [Member]
         
Equity Redemption Refinancing and Change in Control (Textual) [Abstract]          
Fair value of merchant portfolios and other intangible assets   274.5      
Increase in the amount of merchant portfolios and other intangible assets   $ 131.8