Annual report pursuant to Section 13 and 15(d)

ESCROW DEPOSITS Escrow Deposits (Details)

v2.4.1.9
ESCROW DEPOSITS Escrow Deposits (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
May 31, 2014
helicopter
Dec. 31, 2014
helicopter
Dec. 31, 2013
helicopter
Dec. 31, 2012
helicopter
Significant Acquisitions and Disposals [Line Items]          
Escrow Deposit     0us-gaap_EscrowDeposit 0us-gaap_EscrowDeposit  
Significant Acquisitions and Disposals, Number of Disposals     3era_SignificantAcquisitionsAndDisposalsNumberOfDisposals 15era_SignificantAcquisitionsAndDisposalsNumberOfDisposals 8era_SignificantAcquisitionsAndDisposalsNumberOfDisposals [1]
Proceeds from Sale of Property, Plant, and Equipment     7,051,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 65,151,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 5,188,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Medium Helicopter [Member]          
Significant Acquisitions and Disposals [Line Items]          
Significant Acquisitions and Disposals, Number of Disposals   2era_SignificantAcquisitionsAndDisposalsNumberOfDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= era_MediumHelicopterMember 		3era_SignificantAcquisitionsAndDisposalsNumberOfDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= era_MediumHelicopterMember 		10era_SignificantAcquisitionsAndDisposalsNumberOfDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= era_MediumHelicopterMember 		2era_SignificantAcquisitionsAndDisposalsNumberOfDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= era_MediumHelicopterMember 		[1]
Proceeds from Sale of Property, Plant, and Equipment $ 3,000,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= era_MediumHelicopterMember 		$ 6,400,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= era_MediumHelicopterMember 		     
[1] Excludes two light-twin helicopters that were removed from service and includes one light-single helicopter that had previously been removed from service.