[Line Items] for Accounting Policies [Table]

No definition available.

Name:	aegn_AccountingPoliciesLineItems
Namespace Prefix:	aegn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Inputs

+ References

No definition available.

+ Details

Name:	aegn_FairValueInputs
Namespace Prefix:	aegn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Inputs, Compound Annual Growth Rate Assumption

+ References

No definition available.

+ Details

Name:	aegn_FairValueInputsCompoundAnnualGrowthRateAssumption
Namespace Prefix:	aegn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reporting Unit, Fair Value in Below of Carrying Amount, Number of Reporting Units

+ References

No definition available.

+ Details

Name:	aegn_ReportingUnitFairValueinBelowofCarryingAmountNumberofReportingUnits
Namespace Prefix:	aegn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Reporting Unit, Fair Value in Excess of Carrying Amount, Number of Reporting Units

+ References

No definition available.

+ Details

Name:	aegn_ReportingUnitFairValueinExcessofCarryingAmountNumberofReportingUnits
Namespace Prefix:	aegn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Reporting Unit, Increase (Decrease) in Fair Value, Percent

+ References

No definition available.

+ Details

Name:	aegn_ReportingUnitIncreaseDecreaseinFairValuePercent
Namespace Prefix:	aegn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reporting Unit, Increase (Decrease) in Fair Value, Value

+ References

No definition available.

+ Details

Name:	aegn_ReportingUnitIncreaseDecreaseinFairValueValue
Namespace Prefix:	aegn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reporting Unit, Percentage of Fair Value in Below of Carrying Amount

+ References

No definition available.

+ Details

Name:	aegn_ReportingUnitPercentageofFairValueinBelowofCarryingAmount
Namespace Prefix:	aegn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputLongTermRevenueGrowthRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=aegn_FyfeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=aegn_EnergyServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Accounting Policies - Impairment (Details) $ in Thousands			3 Months Ended	9 Months Ended	12 Months Ended
Accounting Policies - Impairment (Details) $ in Thousands	Oct. 01, 2018 USD ($) reportingUnit	Oct. 01, 2016	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Line Items]
Definite-lived intangible asset impairment					$ 2,169	$ 41,032	$ 0
Number of reporting units \| reportingUnit	6
Fair value in excess of carrying amount, number of reporting units \| reportingUnit	1
Percentage of fair value in excess of carrying amount	15.00%
Fair value in below of carrying amount, number of reporting units \| reportingUnit	0
Percentage of fair value in below of carrying amount	10.00%
Goodwill impairment					1,389	45,390	0
Goodwill					$ 260,633	260,715	$ 298,619
Discount Rate \| Minimum
Accounting Policies [Line Items]
Fair value inputs	13.00%
Discount Rate \| Maximum
Accounting Policies [Line Items]
Fair value inputs	16.00%
Long-term Revenue Growth Rate \| Minimum
Accounting Policies [Line Items]
Fair value inputs	1.00%
Significant assumptions used in goodwill review, annual revenue growth rate	(3.20%)
Long-term Revenue Growth Rate \| Maximum
Accounting Policies [Line Items]
Fair value inputs	3.00%
Significant assumptions used in goodwill review, annual revenue growth rate	4.80%
Fyfe
Accounting Policies [Line Items]
Percentage of fair value in excess of carrying amount				45.00%
Reporting unit increase (decrease) in fair value			$ 105,200
Reporting unit, increase (decrease) in fair value (percent)			65.30%
Goodwill						$ 9,600
Fyfe \| Discount Rate
Accounting Policies [Line Items]
Fair value inputs		16.00%	17.00%
Fyfe \| Long-term Revenue Growth Rate
Accounting Policies [Line Items]
Fair value inputs		3.50%	2.50%
Significant assumptions used in goodwill review, annual revenue growth rate		4.00%	10.80%
Energy Services
Accounting Policies [Line Items]
Percentage of fair value in excess of carrying amount	15.00%
Goodwill	$ 48,000
Trademarks \| Fyfe
Accounting Policies [Line Items]
Definite-lived intangible asset impairment				$ 3,400
Customer relationships \| Fyfe
Accounting Policies [Line Items]
Definite-lived intangible asset impairment				20,800
Patents and acquired technology \| Fyfe
Accounting Policies [Line Items]
Definite-lived intangible asset impairment				$ 16,800