Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Computer hardware and software	$ 131,409	$ 100,383
Card-reading equipment	10,887	13,066
Furniture, fixtures, and vehicles	10,291	10,319
Buildings and improvements	10,982	11,294
Property, plant and equipment, gross	163,569	135,062
Less: accumulated depreciation	(82,809)	(61,499)
Property, plant and equipment, net	$ 80,760	$ 73,563
Minimum [Member] | Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Minimum [Member] | Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum [Member] | Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum [Member] | Card-Reading Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum [Member] | Furniture Fixtures and Vehicles [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum [Member] | Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	7 years