Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 325,175	$ 293,908
Cost of revenues	257,763	239,494
Gross profit	67,412	54,414
Operating expenses	52,746	50,725
Acquisition-related expenses	533	1,031
Restructuring charges	0	6,797
Operating income (loss)	14,133	(4,139)
Other income (expense):
Interest expense	(4,047)	(3,615)
Interest income	49	32
Other	(387)	(973)
Total other expense	(4,385)	(4,556)
Income (loss) before taxes on income	9,748	(8,695)
Taxes (benefit) on income (loss)	1,995	(4,746)
Net income (loss)	7,753	(3,949)
Non-controlling interests (income) loss	(1,882)	157
Net income (loss) attributable to Aegion Corporation	$ 5,871	$ (3,792)
Earnings (loss) per share attributable to Aegion Corporation:
Net income (loss) per share, basic (in dollars per share)	$ 0.17	$ (0.11)
Net income (loss) per share, diluted (in dollars per share)	$ 0.17	$ (0.11)