Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v2.4.1.9
Subsequent Events (Details) (Convertible Debt, Subsequent Event, USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended
Feb. 28, 2015
Feb. 28, 2015
Subsequent Event [Line Items]    
Debt instrument, face amount $ 82.5us-gaap_DebtInstrumentFaceAmount $ 82.5us-gaap_DebtInstrumentFaceAmount
Stated interest rate 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
Conversion ratio 0.0539084us-gaap_DebtInstrumentConvertibleConversionRatio1  
Conversion price (in dollar per share) $ 18.55us-gaap_DebtInstrumentConvertibleConversionPrice1 $ 18.55us-gaap_DebtInstrumentConvertibleConversionPrice1
After March 31, 2015 | Redemption Scenario One
    
Subsequent Event [Line Items]    
Threshold percent of stock price trigger 130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= ent_DebtInstrumentRedemptionPeriodOneConversionScenarioOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
After March 31, 2015 | Redemption Scenario Two
    
Subsequent Event [Line Items]    
Threshold percent of stock price trigger 98.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentAxis
= ent_DebtInstrumentRedemptionPeriodoneConversionScenarioTwoMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
Consecutive business days to redeem 5ent_DebtInstrumentConvertibleNumberofBusinessDays
/ us-gaap_DebtInstrumentAxis
= ent_DebtInstrumentRedemptionPeriodoneConversionScenarioTwoMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
Consecutive trading days 5 days  
If Company Undergoes a Fundamental Change
    
Subsequent Event [Line Items]    
Redemption price as a percent 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
On or After February 20, 2019
    
Subsequent Event [Line Items]    
Threshold percent of stock price trigger 130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
Consecutive trading days 30 days  
Trading days 20us-gaap_DebtInstrumentConvertibleThresholdTradingDays
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
On or After February 20, 2022
    
Subsequent Event [Line Items]    
Redemption price as a percent 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember