Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Revenues	$ 194,405	$ 192,601	$ 197,944	$ 202,005	$ 219,644	$ 211,306	$ 214,646	$ 218,011	$ 786,955	$ 863,607	$ 877,293
Gross profit	49,099	51,623	51,705	51,715	56,687	54,852	54,556	56,571	204,142	222,666
Operating income from continuing operations	1,334	1,588	2,893	5,936	4,007	(18,426)	(2,412)	7,033	11,751	(9,798)	519
Net income (loss) from continuing operations	(1,645)	(132)	1,151	4,218	3,130	(20,784)	(5,169)	4,066	3,592	(18,757)	(7,607)
Loss from discontinued operations, net of income tax	(24)	(200)	(16)	(42)	(315)	(47)	(288)	(142)	(282)	(792)	(6,924)
Net income (loss) attributable to Ciber, Inc.	$ (1,661)	$ (356)	$ 1,145	$ 4,174	$ 2,795	$ (20,851)	$ (5,467)	$ 3,919	$ 3,302	$ (19,604)	$ (14,520)
Basic and diluted earnings (loss) per share attributable to Ciber, Inc.:
Continuing operations (in dollars per share)	$ (0.02)	$ 0.00	$ 0.01	$ 0.05	$ 0.04	$ (0.27)	$ (0.07)	$ 0.05	$ 0.04	$ (0.24)	$ (0.10)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	(0.01)	(0.09)
Basic and diluted earning (loss) per share attributable to Ciber, Inc. (in dollars per share)	$ (0.02)	$ 0.00	$ 0.01	$ 0.05	$ 0.04	$ (0.27)	$ (0.07)	$ 0.05	$ 0.04	$ (0.25)	$ (0.19)