Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Computer Hardware And Software [Member] Minimum [Member]	Dec. 31, 2012 Computer Hardware And Software [Member] Maximum [Member]	Dec. 31, 2012 Card-Reading Equipment [Member]	Dec. 31, 2012 Furniture, Fixtures And Vehicles [Member] Minimum [Member]	Dec. 31, 2012 Furniture, Fixtures And Vehicles [Member] Maximum [Member]	Dec. 31, 2012 Building And Improvements [Member] Minimum [Member]	Dec. 31, 2012 Building And Improvements [Member] Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			3 years	7 years	5 years	3 years	6 years	10 years	30 years
Computer hardware and software	$ 65,988	$ 72,920
Card-reading equipment	10,218	6,960
Furniture, fixtures, and vehicles	7,986	5,236
Buildings and improvements	9,710	8,264
Property, plant and equipment, gross	93,902	93,380
Less: accumulated depreciation	(48,706)	(60,656)
Property, plant and equipment, net	$ 45,196	$ 32,724