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

Name:	us-gaap_DerivativeRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

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

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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

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

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
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Derivative Financial Instruments - Summary of Derivative Positions (Details) - 9 months ended Sep. 30, 2017	GBP (£) $ / £ € / £ ZAR / $ CAD / $ $ / € CAD / £	EUR (€) $ / £ € / £ ZAR / $ CAD / $ $ / € CAD / £	USD ($) $ / £ € / £ ZAR / $ CAD / $ $ / € CAD / £	ZAR $ / £ € / £ ZAR / $ CAD / $ $ / € CAD / £
Canadian Dollar/USD \| Sell
Derivative [Line Items]
Notional Amount \| $			$ 1,662,500
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| CAD / $	1.24	1.24	1.24	1.24
Canadian Dollar/British Pound \| Sell
Derivative [Line Items]
Notional Amount	£ 2,700,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| CAD / £	1.67	1.67	1.67	1.67
USD/EURO \| Sell
Derivative [Line Items]
Notional Amount \| €		€ 3,400,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| $ / €	1.19	1.19	1.19	1.19
USD/British Pound \| Sell
Derivative [Line Items]
Notional Amount	£ 4,595,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| $ / £	1.34	1.34	1.34	1.34
EURO/British Pound \| Sell
Derivative [Line Items]
Notional Amount	£ 4,700,000
Weighted Average Remaining Maturity In Years	3 months
Average Exchange Rate \| € / £	0.88	0.88	0.88	0.88
ZAR/USD \| Sell
Derivative [Line Items]
Notional Amount \| ZAR				ZAR 47,459,403
Weighted Average Remaining Maturity In Years	1 month 28 days
Average Exchange Rate \| ZAR / $	13.64	13.64	13.64	13.64
Interest Rate Swaps
Derivative [Line Items]
Notional Amount \| $			$ 236,250,000
Weighted Average Remaining Maturity In Years	3 years 1 month