Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent [Abstract]
Net income (loss) from continuing operations	$ (18,798)	$ (132)	$ (167,484)	$ 5,237
Net income attributable to noncontrolling interests	49	24	84	16
Net income (loss) attributable to Ciber, Inc. from continuing operations	(18,847)	(156)	(167,568)	5,221
Gain (loss) from discontinued operations, net of income tax	14	(200)	362	(258)
NET EARNINGS (LOSS) ATTRIBUTABLE TO CIBER, INC.	$ (18,833)	$ (356)	$ (167,206)	$ 4,963
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic weighted average shares outstanding (in shares)	81,178	79,206	80,776	78,938
Dilutive effect of employee stock plans (in shares)	0	0	0	787
Diluted weighted average shares outstanding (in shares)	81,178	79,206	80,776	79,725
Continuing operations (in dollars per share)	$ (0.23)	$ 0.00	$ (2.07)	$ 0.07
Discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.01)
Basic and diluted earnings (loss) per share attributable to Ciber, Inc. (in dollars per share)	$ (0.23)	$ 0.00	$ (2.07)	$ 0.06
Anti-dilutive securities omitted from the calculation (in shares)	4,124	4,141	4,349	3,137