Revenues, by Product Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue from External Customer [Line Items]
Revenues	$ 135,037	$ 112,149	$ 113,366	$ 104,543	$ 141,241	$ 97,017	$ 92,423	$ 87,743	$ 465,095	$ 418,424	$ 405,755
Retail payments processing
Revenue from External Customer [Line Items]
Revenues									289,501	255,536	255,193
Wholesale banking payments
Revenue from External Customer [Line Items]
Revenues									81,640	86,524	72,608
Payment fraud detection
Revenue from External Customer [Line Items]
Revenues									32,939	22,039	25,521
Card and merchant management
Revenue from External Customer [Line Items]
Revenues									23,130	19,240	15,272
Tools and infrastructure
Revenue from External Customer [Line Items]
Revenues									$ 37,885	$ 35,085	$ 37,161