General	3 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	GENERAL The accompanying unaudited consolidated financial statements of Aegion Corporation and its subsidiaries (collectively, “Aegion” or the “Company”) reflect all adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. All significant intercompany related accounts and transactions have been eliminated in consolidation. The Consolidated Balance Sheet as of December 31, 2018, which is derived from the audited consolidated financial statements, and the interim unaudited consolidated financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), the requirements of Form 10-Q and Article 10 of Regulation S-X and, consequently, do not include all information or footnotes required by GAAP for complete financial statements or all the disclosures normally made in an Annual Report on Form 10-K. Accordingly, the unaudited consolidated financial statements included herein should be read in conjunction with the audited consolidated financial statements and footnotes included in the Company’s 2018 Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 1, 2019. Acquisitions/Strategic Initiatives/Divestitures 2017 Restructuring On July 28, 2017, the Company’s board of directors approved a realignment and restructuring plan (the “2017 Restructuring”). As part of the 2017 Restructuring, the Company announced plans to: (i) divest the Company’s pipe coating and insulation businesses in Louisiana, The Bayou Companies, LLC and Bayou Wasco Insulation, LLC (collectively “Bayou”; (ii) exit all non-pipe related contract applications for the Tyfo^® system in North America; (iii) right-size the cathodic protection services operation in Canada and the CIPP businesses in Australia and Denmark; and (iv) reduce corporate and other operating costs. During 2018, the Company’s board of directors approved additional actions with respect to the 2017 Restructuring, which included the decisions to: (i) divest the Australia and Denmark CIPP businesses; (ii) take actions to further optimize operations within North America, including measures to reduce consolidated operating costs; and (iii) divest or otherwise exit multiple additional international businesses. See Note 4. Infrastructure Solutions Segment (“Infrastructure Solutions”) On May 14, 2018, the Company’s board of directors approved a plan to divest the Company’s CIPP business in Australia (“Insituform Australia”). While restructuring actions in Insituform Australia led to improvements in operating results, an assessment of the long-term fit within the Company’s portfolio led to the decision to divest the business. Accordingly, the Company has classified Insituform Australia’s assets and liabilities as held for sale on the Consolidated Balance Sheet at March 31, 2019 and December 31, 2018. See Note 5. Corrosion Protection Segment (“Corrosion Protection”) During the first quarter of 2019, the Company initiated plans to sell its interest in its cathodic protection materials manufacturing and production joint venture in Saudi Arabia, Corrpower International Limited (“Corrpower”) and its interest in its Titeliner^® and CIPP joint venture in South Africa, Aegion South Africa Proprietary Limited (“Aegion South Africa”). Accordingly, the Company has classified the assets and liabilities of both businesses as held for sale on the Consolidated Balance Sheet at March 31, 2019. See Note 5.

GENERAL

The accompanying unaudited consolidated financial statements of Aegion Corporation and its subsidiaries (collectively, “Aegion” or the “Company”) reflect all adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. All significant intercompany related accounts and transactions have been eliminated in consolidation.

The Consolidated Balance Sheet as of December 31, 2018, which is derived from the audited consolidated financial statements, and the interim unaudited consolidated financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), the requirements of Form 10-Q and Article 10 of Regulation S-X and, consequently, do not include all information or footnotes required by GAAP for complete financial statements or all the disclosures normally made in an Annual Report on Form 10-K. Accordingly, the unaudited consolidated financial statements included herein should be read in conjunction with the audited consolidated financial statements and footnotes included in the Company’s 2018 Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 1, 2019.

Acquisitions/Strategic Initiatives/Divestitures

2017 Restructuring

On July 28, 2017, the Company’s board of directors approved a realignment and restructuring plan (the “2017 Restructuring”). As part of the 2017 Restructuring, the Company announced plans to: (i) divest the Company’s pipe coating and insulation businesses in Louisiana, The Bayou Companies, LLC and Bayou Wasco Insulation, LLC (collectively “Bayou”; (ii) exit all non-pipe related contract applications for the Tyfo^® system in North America; (iii) right-size the cathodic protection services operation in Canada and the CIPP businesses in Australia and Denmark; and (iv) reduce corporate and other operating costs.

During 2018, the Company’s board of directors approved additional actions with respect to the 2017 Restructuring, which included the decisions to: (i) divest the Australia and Denmark CIPP businesses; (ii) take actions to further optimize operations within North America, including measures to reduce consolidated operating costs; and (iii) divest or otherwise exit multiple additional international businesses. See Note 4.

Infrastructure Solutions Segment (“Infrastructure Solutions”)

On May 14, 2018, the Company’s board of directors approved a plan to divest the Company’s CIPP business in Australia (“Insituform Australia”). While restructuring actions in Insituform Australia led to improvements in operating results, an assessment of the long-term fit within the Company’s portfolio led to the decision to divest the business. Accordingly, the Company has classified Insituform Australia’s assets and liabilities as held for sale on the Consolidated Balance Sheet at March 31, 2019 and December 31, 2018. See Note 5.

Corrosion Protection Segment (“Corrosion Protection”)

During the first quarter of 2019, the Company initiated plans to sell its interest in its cathodic protection materials manufacturing and production joint venture in Saudi Arabia, Corrpower International Limited (“Corrpower”) and its interest in its Titeliner^® and CIPP joint venture in South Africa, Aegion South Africa Proprietary Limited (“Aegion South Africa”). Accordingly, the Company has classified the assets and liabilities of both businesses as held for sale on the Consolidated Balance Sheet at March 31, 2019. See Note 5.