Selected Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]
Revenues	$ 219,644	$ 211,306	$ 214,646	$ 218,011	$ 222,300	$ 215,057	$ 220,395	$ 219,541	$ 863,607	$ 877,293	$ 865,597
Gross profit	56,687	54,852	54,556	56,571	57,731	54,062	56,038	55,226	222,666	223,057
Operating income (loss) from continuing operations	4,007	(18,426)	(2,412)	7,033	4,167	(13,469)	5,035	4,786	(9,798)	519	12,668
Net income (loss) from continuing operations	3,130	(20,784)	(5,169)	4,066	1,522	(13,513)	2,935	1,449	(18,757)	(7,607)	(4,073)
Income (loss) from discontinued operations, net of income tax	(315)	(47)	(288)	(142)	(1,435)	(952)	(4,555)	18	(792)	(6,924)	(10,009)
Net income (loss) attributable to Ciber, Inc.	$ 2,795	$ (20,851)	$ (5,467)	$ 3,919	$ 102	$ (14,469)	$ (1,766)	$ 1,613	$ (19,604)	$ (14,520)	$ (14,627)
Basic and diluted earnings (loss) per share attributable to Ciber, Inc.:
Continuing operations (in dollars per share)	$ 0.04	$ (0.27)	$ (0.07)	$ 0.05	$ 0.02	$ (0.18)	$ 0.04	$ 0.02	$ (0.24)	$ (0.10)	$ (0.06)
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.02)	$ (0.01)	$ (0.06)	$ 0.00	$ (0.01)	$ (0.09)	$ (0.14)
Basic and diluted loss per share attributable to Ciber, Inc. (in dollars per share)	$ 0.04	$ (0.27)	$ (0.07)	$ 0.05	$ 0.00	$ (0.19)	$ (0.02)	$ 0.02	$ (0.25)	$ (0.19)	$ (0.20)