Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 276,904	$ 324,861
Cost of revenues	228,609	263,357
Gross profit	48,295	61,504
Operating expenses	47,870	56,142
Acquisition and divestiture expenses	113	392
Restructuring and related charges	1,086	1,789
Operating income (loss)	(774)	3,181
Other income (expense):
Interest expense	(3,590)	(5,443)
Interest income	285	47
Other	(674)	(262)
Total other expense	(3,979)	(5,658)
Loss before tax benefit	(4,753)	(2,477)
Tax benefit on loss	(762)	(1,001)
Net loss	(3,991)	(1,476)
Non-controlling interests income	(10)	(593)
Net loss attributable to Aegion Corporation	$ (4,001)	$ (2,069)
Loss per share attributable to Aegion Corporation:
Basic (in dollars per share)	$ (0.13)	$ (0.06)
Diluted (in dollars per share)	$ (0.13)	$ (0.06)