Quarterly report pursuant to Section 13 or 15(d)

Supplemental Condensed Consolidating Statements of Cash Flows (Details)

v2.4.1.9
Supplemental Condensed Consolidating Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 6,788us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 11,277us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchases of property and equipment (8,866)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (18,751)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposition of property and equipment 5,379us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 3,566us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Cash settlements on forward contracts, net (1,103)us-gaap_PaymentsForProceedsFromHedgeInvestingActivities 0us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
Principal payments on notes due from equity investees 169us-gaap_PaymentsForProceedsFromOtherInvestingActivities 161us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Principal payments on third party notes receivable 25era_CashInflowAndOutflowFromNotesReceivable 36era_CashInflowAndOutflowFromNotesReceivable
Escrow deposits, net (2,800)era_NetIncreaseInEscrowDepositsOnLikeKindExchanges (3,048)era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
Repayment of Intercompany Debt, Investing Activities 0era_RepaymentofIntercompanyDebtInvestingActivities  
Net cash used in investing activities (7,196)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (18,036)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Payments on long-term debt (15,697)era_PaymentsOnLongTermDebtAndCapitalLeaseObligations (697)era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
Proceeds from Revolving Credit Facility (20,000)us-gaap_ProceedsFromLongTermLinesOfCredit 0us-gaap_ProceedsFromLongTermLinesOfCredit
Revolving Credit Facility issuance costs 0us-gaap_PaymentsOfFinancingCosts (2,115)us-gaap_PaymentsOfFinancingCosts
Extinguishment of long-term debt (9,297)us-gaap_EarlyRepaymentOfSeniorDebt 0us-gaap_EarlyRepaymentOfSeniorDebt
Proceeds from share award plans 612us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 529us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Repayment of Intercompany Debt, Financing Activities 0era_RepaymentofIntercompanyDebtFinancingActivities  
Repayment of intercompany debt   0us-gaap_RepaymentsOfRelatedPartyDebt
Net cash used in financing activities (4,382)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,283)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effects of exchange rate changes on cash and cash equivalents (2,386)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations (3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net decrease in cash and cash equivalents (7,176)us-gaap_NetCashProvidedByUsedInContinuingOperations (9,045)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents, beginning of period 40,867us-gaap_CashAndCashEquivalentsAtCarryingValue 31,335us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 33,691us-gaap_CashAndCashEquivalentsAtCarryingValue 22,290us-gaap_CashAndCashEquivalentsAtCarryingValue
Eliminations [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash flows from investing activities:    
Purchases of property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Proceeds from disposition of property and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash settlements on forward contracts, net (1,103)us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Principal payments on notes due from equity investees 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Principal payments on third party notes receivable 0era_CashInflowAndOutflowFromNotesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0era_CashInflowAndOutflowFromNotesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Escrow deposits, net 0era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Repayment of Intercompany Debt, Investing Activities 1,103era_RepaymentofIntercompanyDebtInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash used in investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash flows from financing activities:    
Payments on long-term debt (15,000)era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Proceeds from Revolving Credit Facility (20,000)us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Revolving Credit Facility issuance costs   (2,115)us-gaap_PaymentsOfFinancingCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Extinguishment of long-term debt (9,297)us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Proceeds from share award plans 612us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
529us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Repayment of Intercompany Debt, Financing Activities 3,685era_RepaymentofIntercompanyDebtFinancingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Repayment of intercompany debt   1,586us-gaap_RepaymentsOfRelatedPartyDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net cash used in financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Effects of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net decrease in cash and cash equivalents 0us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents, beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents, end of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Parent [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (1,517)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,717)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from investing activities:    
Purchases of property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from disposition of property and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash settlements on forward contracts, net 0us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Principal payments on notes due from equity investees 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Principal payments on third party notes receivable 0era_CashInflowAndOutflowFromNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0era_CashInflowAndOutflowFromNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Escrow deposits, net 0era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayment of Intercompany Debt, Investing Activities 0era_RepaymentofIntercompanyDebtInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash used in investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from financing activities:    
Payments on long-term debt 0era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from Revolving Credit Facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Revolving Credit Facility issuance costs   0us-gaap_PaymentsOfFinancingCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Extinguishment of long-term debt 0us-gaap_EarlyRepaymentOfSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from share award plans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayment of Intercompany Debt, Financing Activities 0era_RepaymentofIntercompanyDebtFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Repayment of intercompany debt   0us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effects of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net decrease in cash and cash equivalents (1,517)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,717)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of period 16,481us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,635us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period 14,964us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
18,918us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 8,304us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
16,806us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash flows from investing activities:    
Purchases of property and equipment (8,866)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(18,751)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from disposition of property and equipment 5,379us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,566us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash settlements on forward contracts, net 0us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Principal payments on notes due from equity investees 169us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
161us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Principal payments on third party notes receivable 25era_CashInflowAndOutflowFromNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
36era_CashInflowAndOutflowFromNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Escrow deposits, net (2,800)era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3,048)era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Repayment of Intercompany Debt, Investing Activities (1,103)era_RepaymentofIntercompanyDebtInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net cash used in investing activities (7,196)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(18,036)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash flows from financing activities:    
Payments on long-term debt (697)era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(697)era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from Revolving Credit Facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Revolving Credit Facility issuance costs   0us-gaap_PaymentsOfFinancingCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Extinguishment of long-term debt 0us-gaap_EarlyRepaymentOfSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Proceeds from share award plans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Repayment of Intercompany Debt, Financing Activities (3,685)era_RepaymentofIntercompanyDebtFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Repayment of intercompany debt   (1,586)us-gaap_RepaymentsOfRelatedPartyDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash used in financing activities (4,382)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,283)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Effects of exchange rate changes on cash and cash equivalents (2,386)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net decrease in cash and cash equivalents (5,660)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3,516)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period 22,188us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,403us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, end of period 16,528us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,887us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantor [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 1us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
188us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash flows from investing activities:    
Purchases of property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from disposition of property and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash settlements on forward contracts, net 0us-gaap_PaymentsForProceedsFromHedgeInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Principal payments on notes due from equity investees 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Principal payments on third party notes receivable 0era_CashInflowAndOutflowFromNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0era_CashInflowAndOutflowFromNotesReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Escrow deposits, net 0era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0era_NetIncreaseInEscrowDepositsOnLikeKindExchanges
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Repayment of Intercompany Debt, Investing Activities 0era_RepaymentofIntercompanyDebtInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash used in investing activities 0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash flows from financing activities:    
Payments on long-term debt 0era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0era_PaymentsOnLongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from Revolving Credit Facility 0us-gaap_ProceedsFromLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Revolving Credit Facility issuance costs   0us-gaap_PaymentsOfFinancingCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Extinguishment of long-term debt 0us-gaap_EarlyRepaymentOfSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Proceeds from share award plans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Repayment of Intercompany Debt, Financing Activities 0era_RepaymentofIntercompanyDebtFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash used in financing activities 0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Effects of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net decrease in cash and cash equivalents 1us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
188us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period 2,198us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,297us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, end of period $ 2,199us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
$ 1,485us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember