Stock-Based Compensation Plans - Summary of Nonvested Transaction Restricted Share Awards Issued under Stock Incentive Plan and Changes During Period (Detail) - S1 Corporation 2003 Stock Incentive Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Nonvested Restricted Share Awards
Beginning Balance	17,565	57,552	150,732
Vested	(13,201)	(19,822)	(35,598)
Forfeited	(4,364)	(20,165)	(57,582)
Ending Balance		17,565	57,552
Weighted-Average Grant Date Fair Value
Beginning Balance	$ 11.80	$ 11.80	$ 11.80
Vested	11.80	11.80	11.80
Forfeited	$ 11.80	11.80	11.80
Ending Balance		$ 11.80	$ 11.80