Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Dart Narrative (Details)

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Dart Narrative (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Feb. 28, 2011
Dart Helicopter Services LLC and Dart Holding Company Ltd. [Member] | Products Purchased [Member]          
Schedule of Equity Method Investments [Line Items]          
Expenses from transactions with related party $ 3,600,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_ProductsPurchasedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCandDartHoldingCompanyLtd.Member 		$ 2,900,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_ProductsPurchasedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCandDartHoldingCompanyLtd.Member 		$ 1,700,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_ProductsPurchasedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCandDartHoldingCompanyLtd.Member 		   
Dart Helicopter Services LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCMember 		       
Additional investment         5,000,000era_EquityMethodInvestmentsAdditionalInvestment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCMember
Dart Helicopter Services LLC [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Notes receivable to related party       300,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCMember 		 
Notes receivable interest rate       5.00%us-gaap_RelatedPartyTransactionRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCMember 		 
Dart Helicopter Services LLC [Member] | Era DHS LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= era_EraDHSLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHelicopterServicesLLCMember 		       
Dart Holding Company Ltd. [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHoldingCompanyLtdMember
Dart Holding Company Ltd. [Member] | Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Notes receivable to related party         $ 5,100,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHoldingCompanyLtdMember
Notes receivable interest rate         4.00%us-gaap_RelatedPartyTransactionRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_EquityMethodInvesteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_DartHoldingCompanyLtdMember