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Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jul. 24, 2007
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
2010 Grant
Minimum
Dec. 31, 2010
2010 Grant
Minimum
Dec. 31, 2011
2010 Grant
Maximum
Dec. 31, 2013
2010 Grant
Maximum
Dec. 31, 2013
2013 Grant
Dec. 31, 2012
2012 Grant
Dec. 31, 2011
2011 Grant
Dec. 31, 2005
2005 Stock Incentive Plan
Jun. 14, 2012
2005 Stock Incentive Plan
Jul. 24, 2007
2005 Stock Incentive Plan
Dec. 31, 2013
Employee Stock Purchase Plan 1999
Dec. 31, 2012
Employee Stock Purchase Plan 1999
Dec. 31, 2011
Employee Stock Purchase Plan 1999
Dec. 31, 2013
Restricted share awards (RSAs)
Dec. 31, 2012
Restricted share awards (RSAs)
Dec. 31, 2011
Restricted share awards (RSAs)
Dec. 31, 2013
Restricted share awards (RSAs)
S1 Corporation
Dec. 31, 2013
Restricted share awards (RSAs)
Minimum
Dec. 31, 2013
Restricted share awards (RSAs)
Maximum
Dec. 31, 2013
2002 Non-Employee Director Stock Option Plan
Dec. 31, 2013
1999 Stock Option Plan
Dec. 31, 2013
1999 Stock Option Plan
Minimum
Dec. 31, 2013
1999 Stock Option Plan
Maximum
Dec. 31, 2013
Stock Options
Dec. 31, 2013
LTIP Performance Shares
Dec. 31, 2012
LTIP Performance Shares
Dec. 31, 2011
LTIP Performance Shares
Dec. 31, 2013
LTIP Performance Shares
Minimum
Dec. 31, 2012
LTIP Performance Shares
Minimum
Dec. 31, 2011
LTIP Performance Shares
Minimum
Dec. 31, 2013
LTIP Performance Shares
Maximum
Dec. 31, 2012
LTIP Performance Shares
Maximum
Dec. 31, 2011
LTIP Performance Shares
Maximum
Dec. 31, 2013
S1 2003 Stock Incentive Plan
Dec. 31, 2012
S1 2003 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                              
Number of shares authorized                         7,750,000 5,000,000 1,500,000                 250,000 4,000,000                            
Permitted designation for purchase of common stock under ESPP                             Participating employees are permitted to designate up to the lesser of $25,000, or 10% of their annual base compensation, for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter.                                                
Employee participating annual base compensation designated for purchase of common stock, amount                             $ 25,000                                                
Employee participating annual base compensation designated for purchase of common stock, percent                             10.00%                                                
Price of common stock purchased under ESPP, description                             The price for shares of common stock purchased under the ESPP is 85% of the stock's fair market value on the last business day of the three-month participation period.                                                
Price of common stock purchased under ESPP, percent                             85.00%                                                
Shares issued under ESPP   42,856 40,798 40,669                                                                      
Discount offered pursuant to ESPP, percentage                             15.00%                                                
Stock-based compensation expense   13,572,000 15,186,000 11,254,000                     300,000 200,000 200,000                                            
Employee stock purchase plan, amended plan start date May 01, 2008                                                                            
Employee stock purchase plan, amended plan end date Apr. 30, 2018                                                                            
Employee stock purchase plan term 10 years                     10 years                                                      
Shares of common stock reserved for issuance prior to amendment                       3,000,000                                                      
Awards granted requisite service period                                   3 years 3 years 3 years 4 years 3 years 4 years                                
Restricted share awards, vesting increments on anniversary dates of grants                                   33.00% 33.00% 33.00% 25.00% 33.00% 25.00%                                
Vesting percentage if employee is terminated without cause within 12 months from acquisition date                                         100.00%                                    
Stock option plan expiration date                                               2005-03 2009-02                            
Term of outstanding options   5 years 8 months 27 days                                           10 years 10 years                            
Stock option vesting period                                                   3 years 4 years                        
Incentive plan, percentage of options expected to vest over the vesting period   93.90%                                                                          
Incentive plan, weighted-average grant date fair value of stock options granted   $ 26.16 $ 20.56 $ 14.00                                                                      
Incentive plan, total intrinsic value of stock options exercised   25,500,000 17,300,000 6,700,000                                                                      
Dividend yield                                                                                 
Maximum attainment percentage that may be achieved for LTIP Performance Shares                                                         200.00% 200.00% 200.00%                
LTIP Performance Shares, Performance period                                                               1 year 1 year 1 year 3 years 3 years 3 years    
Expected attainment level for the awards granted, percentage         130.00% 100.00% 175.00% 175.00% 100.00% 100.00% 100.00%                                                        
Restricted shares awards, shares vested                                   29,546 79,299 86,325                 327,576                 11,866 100,685
Restricted shares withheld to pay employees' portion of minimum payroll withholding taxes                                   10,582 23,813 25,495                 112,754                 3,769 38,167
Unrecognized compensation costs                                   2,300,000                   13,500,000 22,000,000                    
Unrecognized compensation costs, weighted-average recognition periods                                   1 year 9 months 18 days                   2 years 4 months 24 days 2 years 6 months                    
Stock-based compensation expenses tax benefits   5,200,000 5,500,000 4,100,000                                                                      
Proceeds from exercises of stock options   19,561,000 16,730,000 4,478,000                                                                      
Actual tax benefit realized from tax deductions of option exercises   $ 9,700,000 $ 6,300,000 $ 2,500,000