Segment Information - Revenue By Service and Product Solution (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue summary by product and service solution
Services	$ 396,909	$ 388,951	$ 793,774	$ 753,325
Products	346,279	273,431	647,905	523,214
Total sales	743,188	662,382	1,441,679	1,276,539
Financial self-service [Member]
Revenue summary by product and service solution
Services	295,587	285,337	595,522	549,793
Products	294,105	225,078	555,172	423,718
Total sales	589,692	510,415	1,150,694	973,511
Security [Member]
Revenue summary by product and service solution
Services	101,248	103,602	198,088	203,520
Products	42,780	44,431	80,813	87,844
Total sales	144,028	148,033	278,901	291,364
Financial Self Service And Security [Member]
Revenue summary by product and service solution
Total sales	733,720	658,448	1,429,595	1,264,875
Election And Lottery Systems [Member]
Revenue summary by product and service solution
Total sales	$ 9,468	$ 3,934	$ 12,084	$ 11,664