Quarterly report pursuant to Section 13 or 15(d)

Notes Payable and Bank Debts - Narrative (Details)

v2.4.1.9
Notes Payable and Bank Debts - Narrative (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 1 Months Ended
Dec. 22, 2014
Feb. 28, 2015
Dec. 31, 2014
Jul. 31, 2013
Mar. 31, 2015
Oct. 18, 2013
PMG            
Debt Instrument [Line Items]            
Business acquisition, assumed indebtedness       $ 3.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ent_PostModernGroupPurchaseMember 		   
Effective interest rate percentage     3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= ent_PostModernGroupPurchaseMember 		     
IFES Acquisition Corp Limited            
Debt Instrument [Line Items]            
Business acquisition, assumed indebtedness           1.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember
Effective interest rate percentage     1.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember 		     
Accrued interest         0ent_DebtInstrumentAccruedInterest
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember 		 
Term Loan | Citibank            
Debt Instrument [Line Items]            
Maximum borrowing capacity 2.4us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ent_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= ent_CitibankMember 		         
Loan payment 0.2us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_CreditFacilityAxis
= ent_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= ent_CitibankMember 		         
Debt issuance cost 0.3us-gaap_DebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= ent_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= ent_CitibankMember 		         
Term loan         2.2us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ent_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= ent_CitibankMember 		 
Revolving Credit Facility | Citibank            
Debt Instrument [Line Items]            
Maximum borrowing capacity 20.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ent_CitibankMember 		      20.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ent_CitibankMember 		 
Term Loan | PMG            
Debt Instrument [Line Items]            
Business acquisition, assumed indebtedness       1.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ent_PostModernGroupPurchaseMember
/ us-gaap_DebtInstrumentAxis
= ent_TermLoanMember 		   
Line of Credit            
Debt Instrument [Line Items]            
Borrowings outstanding under facility letters         0.9us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember 		 
Line of Credit | PMG            
Debt Instrument [Line Items]            
Business acquisition, assumed indebtedness       1.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ent_PostModernGroupPurchaseMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember 		   
Convertible Debt            
Debt Instrument [Line Items]            
Debt instrument, face amount   82.5us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Stated interest rate   2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Conversion ratio   0.0539084us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Conversion price (in USD per share)   $ 18.55us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Convertible debt   69.5us-gaap_ConvertibleDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		    69.6us-gaap_ConvertibleDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		 
Equity component of convertible debt   13.0us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		    13.0us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		 
Convertible Debt | Liability Component            
Debt Instrument [Line Items]            
Deferred debt issuance costs   1.8us-gaap_DeferredFinanceCostsGross
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Convertible Debt | Additional Paid-in Capital            
Debt Instrument [Line Items]            
Deferred debt issuance costs   0.3us-gaap_DeferredFinanceCostsGross
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Convertible Debt | If Company Undergoes a Fundamental Change            
Debt Instrument [Line Items]            
Redemption price   100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Convertible Debt | On or After February 20, 2019            
Debt Instrument [Line Items]            
Percent of stock price to trigger conversion   130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Consecutive trading days   20us-gaap_DebtInstrumentConvertibleThresholdTradingDays
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Consecutive trading days   30 days        
Convertible Debt | On or After February 20, 2022            
Debt Instrument [Line Items]            
Redemption price   100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Convertible Debt | Redemption scenario one | After March 31, 2015            
Debt Instrument [Line Items]            
Percent of stock price to trigger conversion   130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= ent_DebtInstrumentRedemptionPeriodOneConversionScenarioOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Convertible Debt | Redemption scenario two | After March 31, 2015            
Debt Instrument [Line Items]            
Percent of stock price to trigger conversion   98.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= ent_DebtInstrumentRedemptionPeriodoneConversionScenarioTwoMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Consecutive business days   5ent_DebtInstrumentConvertibleNumberofBusinessDays
/ us-gaap_DebtInstrumentAxis
= ent_DebtInstrumentRedemptionPeriodoneConversionScenarioTwoMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember 		       
Consecutive trading days   5 days        
Commercial mortgage loan | Mortgage letters maturing October 2014 | IFES Acquisition Corp Limited            
Debt Instrument [Line Items]            
Business acquisition, assumed indebtedness           0.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember
/ us-gaap_DebtInstrumentAxis
= ent_MortgageLettersMaturingOctober2014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Commercial mortgage loan | Mortgage letters maturing October 2032 | IFES Acquisition Corp Limited            
Debt Instrument [Line Items]            
Business acquisition, assumed indebtedness           $ 1.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ent_IFESAcquisitionCorpLimitedMember
/ us-gaap_DebtInstrumentAxis
= ent_MortgageLettersMaturingOctober2032Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember