Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Lake Palma Narrative (Details)

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Lake Palma Narrative (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 24, 2014
Jul. 23, 2014
Schedule of Equity Method Investments [Line Items]          
Advances from equity method investment $ 0us-gaap_EquityMethodInvestmentDividendsOrDistributions $ 0us-gaap_EquityMethodInvestmentDividendsOrDistributions $ (16,000)us-gaap_EquityMethodInvestmentDividendsOrDistributions    
Lake Palma [Member]          
Schedule of Equity Method Investments [Line Items]          
Number of Helicopters Operated 7era_NumberofHelicoptersOperated
/ dei_LegalEntityAxis
= era_LakePalmaMember 		       
Advances from equity method investment 0us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= era_LakePalmaMember 		0us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= era_LakePalmaMember 		1,200,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ dei_LegalEntityAxis
= era_LakePalmaMember 		   
Lake Palma [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_LakePalmaMember 		[1]       51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_LakePalmaMember
Sales price of equity method investment       9,300,000us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_LakePalmaMember 		 
Gain on sale of equity method investment       1,500,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_LakePalmaMember 		 
Debt obligations       $ 2,900,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= era_LakePalmaMember 		 
[1] The Company owned a 51% financial interest in Lake Palma; however, it did not consolidate as it only controlled 50% of the venture’s voting rights. Effective July 24, 2014, the Company sold its interest in Lake Palma to its joint venture partner (see further discussion below).