Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues	$ 308,524	$ 356,595	$ 900,118	$ 1,002,857
Cost of revenues	242,206	279,474	718,196	794,493
Gross profit	66,318	77,121	181,922	208,364
Operating expenses	45,277	51,554	146,808	157,964
Acquisition-related expenses	324	457	2,059	780
Restructuring charges	212	172	8,544	1,034
Operating income	20,505	24,938	24,511	48,586
Other income (expense):
Interest expense	(3,825)	(3,144)	(11,081)	(9,365)
Interest income	37	25	197	229
Other	288	(359)	(1,183)	(2,360)
Total other expense	(3,500)	(3,478)	(12,067)	(11,496)
Income before taxes on income	17,005	21,460	12,444	37,090
Taxes on income	5,218	6,237	1,413	11,647
Net income	11,787	15,223	11,031	25,443
Non-controlling interests (income) loss	280	(473)	666	(650)
Net income attributable to Aegion Corporation	$ 12,067	$ 14,750	$ 11,697	$ 24,793
Earnings per share attributable to Aegion Corporation:
Net income (loss) per share, basic (in dollars per share)	$ 0.35	$ 0.41	$ 0.33	$ 0.68
Net income (loss) per share, diluted (in dollars per share)	$ 0.34	$ 0.40	$ 0.33	$ 0.67