| Component: (Network and Table) | |
|---|---|
| Network | 066 - Disclosure - Note 8 - Taxes on Income (Tax Benefits) (Detail) (http://www.aegion.com/role/NoteDetail0000000) |
| Table | Statement [Table] |
| Reporting Entity [Axis] | 0000353020 (http://www.sec.gov/CIK) |
| Statement [Line Items] | Period [Axis] | ||||
|---|---|---|---|---|---|
2012-01-01 - 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 | ||
| Nature of Uncertainty [Axis] | Nature of Uncertainty [Axis] | Nature of Uncertainty [Axis] | Nature of Uncertainty [Axis] | ||
| Expiration Of Statutes Of Limitation [Member] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] | |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | .35 | ||||
Deferred Tax Assets, Operating Loss Carryforwards | 17,225,000 | 14,366,000 | |||
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 7,800,000 | ||||
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 9,400,000 | ||||
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 88,000 | 483,000 | |||
Deferred Tax Assets, Foreign Credit Carryforwards, Not Subject to Expiration | 100,000 | ||||
Deferred Tax Assets, Valuation Allowance | 6,574,000 | 4,691,000 | 4,700,000 | ||
Undistributed Profits of Non-US Subsidiaries Considered Permanently Reinvested | 261,300,000 | ||||
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 400,000 | 1,000,000 | |||
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 600,000 | 100,000 | 200,000 | ||