Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 12,178	$ 3,193	$ 19,931	$ (756)
Other comprehensive income (loss):
Currency translation adjustments		12,569	(399)	16,438	(957)
Deferred gain (loss) on hedging activity, net of tax	[1]	(307)	(486)	176	(4,059)
Pension activity, net of tax	[2]	(11)	(52)	(16)	(173)
Total comprehensive income (loss)		24,429	2,256	36,529	(5,945)
Comprehensive (income) loss attributable to non-controlling interests		(1,111)	313	(2,980)	228
Comprehensive income (loss) attributable to Aegion Corporation		23,318	2,569	33,549	(5,717)
Deferred gain on hedging activity, tax		(204)	(325)	117	(2,717)
Pension activity, tax (benefit) expense		$ (3)	$ (13)	$ (4)	$ (43)

[1] Amounts presented net of tax of $(204) and $(325) for the quarters ended June 30, 2017 and 2016, respectively, and $117 and $(2,717) for the six months ended June 30, 2017 and 2016, respectively.

[2] Amounts presented net of tax of $(3) and $(13) for the quarters ended June 30, 2017 and 2016, respectively, and $(4) and $(43) for the six months ended June 30, 2017 and 2016, respectively.