Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (1,476)	$ 7,753
Other comprehensive income (loss):
Currency translation adjustments		2,228	3,869
Deferred gain on hedging activity, net of tax	[1]	494	483
Pension activity, net of tax	[2]	(7)	(5)
Total comprehensive income		1,239	12,100
Comprehensive income attributable to non-controlling interests		(646)	(1,869)
Comprehensive income attributable to Aegion Corporation		$ 593	$ 10,231

[1] Amounts presented net of tax of $177 and $321 for the quarters ended March 31, 2018 and 2017, respectively.

[2] Amounts presented net of tax of $(2) and $(1) for the quarters ended March 31, 2018 and 2017, respectively.