Segment Information - Operations by Segments (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of operating business segments (in segment) | segment			3
Segment Reporting Information [Line Items]
Revenues	$ 103,511	$ 97,672	$ 204,791	$ 193,151
Income from operations	29,994	28,192	60,586	54,758
Operating Segments
Segment Reporting Information [Line Items]
Income from operations	37,279	38,188	75,071	72,271
Operating Segments | Merchant Acquiring, net
Segment Reporting Information [Line Items]
Revenues	23,506	23,277	45,991	46,167
Income from operations	7,192	8,786	14,100	17,212
Operating Segments | Payment Processing
Segment Reporting Information [Line Items]
Revenues	39,476	36,289	78,209	70,828
Income from operations	16,566	14,276	33,799	26,690
Operating Segments | Business Solutions
Segment Reporting Information [Line Items]
Revenues	49,312	46,238	97,991	91,852
Income from operations	13,521	15,126	27,172	28,369
Other
Segment Reporting Information [Line Items]
Revenues	(8,783)	(8,132)	(17,400)	(15,696)
Income from operations	$ (7,285)	$ (9,996)	$ (14,485)	$ (17,513)