Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS Schedule of Related Party Transactions (Details)

v2.4.1.9
RELATED PARTY TRANSACTIONS Schedule of Related Party Transactions (Details) (SEACOR [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Expenses from transactions with related party $ 3,048us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 3,367us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 11,096us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Payroll Costs [Member]
      
Related Party Transaction [Line Items]      
Expenses from transactions with related party 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_PayrollCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember 		5us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_PayrollCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember 		8,159us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_PayrollCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Administrative Support [Member]
      
Related Party Transaction [Line Items]      
Expenses from transactions with related party 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_AdministrativeSupportMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember 		299us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_AdministrativeSupportMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember 		2,937us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_AdministrativeSupportMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Amended and Restated Transition Services Agreement [Member]
      
Related Party Transaction [Line Items]      
Expenses from transactions with related party $ 3,048us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_AmendedAndRestatedTransitionServicesAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember 		$ 3,063us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_AmendedAndRestatedTransitionServicesAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember 		$ 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= era_AmendedAndRestatedTransitionServicesAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember