Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v2.4.1.9
Income Taxes - Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 18, 2013
Valuation Allowance [Line Items]        
Federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Valuation allowance $ 73,659,000us-gaap_DeferredTaxAssetsValuationAllowance $ 50,782,000us-gaap_DeferredTaxAssetsValuationAllowance $ 39,122,000us-gaap_DeferredTaxAssetsValuationAllowance  
Business acquisition, uncertain tax positions 6,300,000ent_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLiabilityforUncertainTaxPositions 3,200,000ent_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLiabilityforUncertainTaxPositions    
Liability for uncertain tax positions 6,300,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent      
Uncertain tax positions, if reversed, would result in a tax benefit 6,300,000ent_UncertainTaxPositionsthatWouldImpactIncomeTaxExpenseBenefit      
Domestic Deferred Tax Assets        
Valuation Allowance [Line Items]        
Valuation allowance 70,900,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= ent_DomesticDeferredTaxAssetsMember 		48,900,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= ent_DomesticDeferredTaxAssetsMember 		   
Foreign Deferred Tax Assets        
Valuation Allowance [Line Items]        
Valuation allowance 2,800,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= ent_ForeignDeferredTaxAssetsMember 		1,900,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= ent_ForeignDeferredTaxAssetsMember 		   
AIA Purchase Agreement        
Valuation Allowance [Line Items]        
Business combination, deferred tax liabilities, net 22,200,000ent_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNet
/ us-gaap_BusinessAcquisitionAxis
= ent_AiaPurchaseAgreementMember 		     
IFES Acquisition Corp Limited        
Valuation Allowance [Line Items]        
Business combination, deferred tax liabilities, net 7,000,000ent_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNet
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember 		    6,200,000ent_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNet
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember
Federal        
Valuation Allowance [Line Items]        
Operating loss carryforwards 128,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember 		102,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember 		   
State        
Valuation Allowance [Line Items]        
Statutory tax rate 2.00%ent_StatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember 		     
Operating loss carryforwards $ 64,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember 		$ 58,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember 		   
Germany        
Valuation Allowance [Line Items]        
Statutory tax rate 33.00%ent_StatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= ent_GermanyMember 		     
United Kingdom        
Valuation Allowance [Line Items]        
Statutory tax rate 22.00%ent_StatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= ent_UnitedKingdomMember 		     
Canada        
Valuation Allowance [Line Items]        
Statutory tax rate 27.00%ent_StatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= ent_CanadaMember