Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=aegn_USDBritishPoundMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=aegn_EUROBritishPoundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=aegn_ZARUSDMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
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Derivative Financial Instruments - Summary of Derivative Positions (Details) - 3 months ended Mar. 31, 2018	GBP (£) € / £ $ / £ R / $	USD ($) € / £ $ / £ R / $	ZAR (R) € / £ $ / £ R / $
USD/British Pound \| Sell
Derivative [Line Items]
Notional Amount	£ 1,761,800
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| $ / £	1.41	1.41	1.41
EURO/British Pound \| Sell
Derivative [Line Items]
Notional Amount	£ 2,568,300
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| € / £	1.14	1.14	1.14
ZAR/USD \| Sell
Derivative [Line Items]
Notional Amount \| R			R 5,747,262
Weighted Average Remaining Maturity In Years	1 month 10 days
Average Exchange Rate \| R / $	0.08	0.08	0.08
Interest Rate Swaps
Derivative [Line Items]
Notional Amount \| $		$ 226,406,250
Weighted Average Remaining Maturity In Years	4 years 9 months