Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2011 New Senior Secured Credit Facilities	Feb. 13, 2012 S1 Corporation	Mar. 31, 2012 S1 Corporation	Mar. 31, 2012 Business Acquisition Pro Forma Information	Mar. 31, 2012 Available-for-sale Securities
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition cash paid					$ 368,700,000
Acquisition transaction paid in shares					5,900,000
Issuance of shares from treasury stock for acquisition of S1 Corporation	95,500
Total Purchase Price					587,284,000
Acquisition transaction, cash exchanged per S1 share					$ 10.00
Acquisition transaction, Company's stock exchanged per S1 share					0.3148
Proration of exchange percentage, S1 share for the Company's shares					33.80%
Proration of exchange percentage, S1 share for cash					66.20%
Share price used to calculate cash payment for fractional shares					$ 34.14
Issuance of shares for acquisition of S1 Corporation								1,107,000
Reclassification of unrealized gain to a realized gain on available-for-sale securities	1,557,000
Acquisition transaction paid in cash			73,700,000
Proceeds from senior bank financing arranged for business acquisition				295,000,000
Acquisition related transaction expenses						5,200,000
Revenue						22,500,000
Net operating losses	(1,613,000)	7,498,000				8,800,000
Additional revenue							4,300,000
Employee related action including share based compensation on Vested transaction RSA							9,600,000
Investment bank fees							7,800,000
Professional fees							$ 1,200,000