Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 324,861	$ 325,175
Cost of revenues	263,357	257,763
Gross profit	61,504	67,412
Operating expenses	56,142	52,746
Acquisition and divestiture expenses	392	533
Restructuring and related charges	1,789	0
Operating income	3,181	14,133
Other income (expense):
Interest expense	(5,443)	(4,047)
Interest income	47	49
Other	(262)	(387)
Total other expense	(5,658)	(4,385)
Income (loss) before taxes on income	(2,477)	9,748
Taxes (benefit) on income (loss)	(1,001)	1,995
Net income (loss)	(1,476)	7,753
Non-controlling interests income	(593)	(1,882)
Net income (loss) attributable to Aegion Corporation	$ (2,069)	$ 5,871
Earnings (loss) per share attributable to Aegion Corporation:
Net income (loss) per share, basic (in dollars per share)	$ (0.06)	$ 0.17
Net income (loss) per share, diluted (in dollars per share)	$ (0.06)	$ 0.17