Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 354,473	$ 297,686	$ 679,648	$ 591,594
Cost of revenues	274,705	236,496	532,468	475,990
Gross profit	79,768	61,190	147,180	115,604
Operating expenses	58,109	50,806	110,855	101,531
Acquisition-related expenses	0	704	533	1,735
Restructuring charges	0	1,535	0	8,332
Operating income	21,659	8,145	35,792	4,006
Other income (expense):
Interest expense	(4,005)	(3,641)	(8,052)	(7,256)
Interest income	35	128	84	160
Other	(408)	(498)	(795)	(1,471)
Total other expense	(4,378)	(4,011)	(8,763)	(8,567)
Income (loss) before taxes on income	17,281	4,134	27,029	(4,561)
Taxes (benefit) on income (loss)	5,103	941	7,098	(3,805)
Net income (loss)	12,178	3,193	19,931	(756)
Non-controlling interests (income) loss	(1,078)	229	(2,960)	386
Net income (loss) attributable to Aegion Corporation	$ 11,100	$ 3,422	$ 16,971	$ (370)
Earnings (loss) per share attributable to Aegion Corporation:
Net income (loss) per share, basic (in dollars per share)	$ 0.33	$ 0.10	$ 0.51	$ (0.01)
Net income (loss) per share, diluted (in dollars per share)	$ 0.33	$ 0.10	$ 0.50	$ (0.01)