Segment Information - Income from Segments to Consolidated Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment income from operations
Income from operations	$ 29,994	$ 28,192	$ 60,586	$ 54,758
Interest expense, net	(7,190)	(6,046)	(14,041)	(11,837)
Earnings (losses) of equity method investment	115	29	258	(101)
Other income	1,363	860	2,637	1,258
Income tax expense	(4,068)	(2,801)	(6,088)	(4,677)
Net income	20,214	20,234	43,352	39,401
Operating Segments
Segment income from operations
Income from operations	37,279	38,188	75,071	72,271
Operating Segments | Merchant Acquiring, net
Segment income from operations
Income from operations	7,192	8,786	14,100	17,212
Operating Segments | Payment Processing
Segment income from operations
Income from operations	16,566	14,276	33,799	26,690
Operating Segments | Business Solutions
Segment income from operations
Income from operations	13,521	15,126	27,172	28,369
Other
Segment income from operations
Income from operations	$ (7,285)	$ (9,996)	$ (14,485)	$ (17,513)