Segment Information - Revenues, by Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
Revenues	$ 342,730	$ 216,975	$ 219,930	$ 226,066	$ 308,637	$ 238,701	$ 265,822	$ 232,817	$ 1,005,701	$ 1,045,977	$ 1,016,149
Retail payments processing
Revenue from External Customer [Line Items]
Revenues									415,729	402,454	406,023
Billers
Revenue from External Customer [Line Items]
Revenues									255,540	241,949	235,039
Online banking and community financial services
Revenue from External Customer [Line Items]
Revenues									125,580	219,698	227,659
Tools and infrastructure
Revenue from External Customer [Line Items]
Revenues									63,923	42,783	40,427
Wholesale banking payments
Revenue from External Customer [Line Items]
Revenues									37,040	41,545	37,879
Payment fraud management
Revenue from External Customer [Line Items]
Revenues									30,130	27,373	36,235
Card and merchant management
Revenue from External Customer [Line Items]
Revenues									$ 77,759	$ 70,175	$ 32,887