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Purchase Price of S1 Corporation's Common stock (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Feb. 13, 2012 S1 Corporation	Feb. 13, 2012 S1 Corporation Covenant not to compete
Business Acquisition [Line Items]
Cash payments			$ 365,918
Issuance of ACI common stock		204,856	204,857
Reissuance of treasury stock		2,174	2,174
Cash payments		641,700	368,700	2,778
S1 shares previously held as available-for-sale securities			11,557
Total Purchase Price	$ 378,100		$ 587,284

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