Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 11,787	$ 15,223	$ 11,031	$ 25,443
Other comprehensive income (loss):
Currency translation adjustments		3,885	(2,963)	2,928	(21,438)
Pension activity, net of tax	[1]	90	16	(83)	12
Deferred gain (loss) on hedging activity, net of tax	[2]	895	(274)	(3,163)	110
Total comprehensive income		16,657	12,002	10,713	4,127
Comprehensive (income) loss attributable to non-controlling interests		365	(700)	593	791
Comprehensive income attributable to Aegion Corporation		17,022	11,302	11,306	4,918
Pension activity, tax (benefit) expense		23	4	(21)	3
Deferred gain on hedging activity, tax		$ 617	$ (183)	$ (2,100)	$ 74

[1] Amounts presented net of tax of $23 and $4 for the quarters ended September 30, 2016 and 2015, respectively, and $(21) and $3 for the nine months ended September 30, 2016 and 2015, respectively.

[2] Amounts presented net of tax of $617 and $(183) for the quarters ended September 30, 2016 and 2015, respectively, and $(2,100) and $74 for the nine months ended September 30, 2016 and 2015, respectively.