Segment Information - Revenue By Service and Product Solution (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue summary by product and service solution
Services	$ 396,865	$ 364,374
Products	301,626	249,783
Total sales	698,491	614,157
Financial self-service [Member]
Revenue summary by product and service solution
Services	299,935	264,456
Products	261,067	198,640
Total sales	561,002	463,096
Security [Member]
Revenue summary by product and service solution
Services	96,840	99,918
Products	38,033	43,413
Total sales	134,873	143,331
Financial Self Service And Security [Member]
Revenue summary by product and service solution
Total sales	695,875	606,427
Election And Lottery Systems [Member]
Revenue summary by product and service solution
Total sales	$ 2,616	$ 7,730