Purchase Price of S1 Corporation's Common stock (Detail) (S1 Corporation, USD $) In Thousands, unless otherwise specified	Feb. 13, 2012
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Cash payments	$ 368,700
S1 shares previously held as available-for-sale securities	11,557
Total Purchase Price	587,284
Shareholders
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Cash payments	365,918
Common Stock
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Issuance of share	204,857
Treasury Stock
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Issuance of share	2,174
Covenant not to compete
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Cash payments	$ 2,778