Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss		$ (3,991)	$ (1,476)
Other comprehensive income (loss):
Currency translation adjustments		1,862	2,228
Deferred gain (loss) on hedging activity, net of tax	[1]	(2,146)	494
Pension activity, net of tax	[2]	(21)	(7)
Total comprehensive income (loss)		(4,296)	1,239
Comprehensive (income) loss attributable to non-controlling interests		77	(646)
Comprehensive income (loss) attributable to Aegion Corporation		$ (4,219)	$ 593

[1] Amounts presented net of tax of $(59) and $177 for the quarters ended March 31, 2019 and 2018, respectively.

[2] Amounts presented net of tax of $(5) and $(2) for the quarters ended March 31, 2019 and 2018, respectively.