Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, net - Amortization Expense (Details)

v2.4.1.9
Intangible Assets, net - Amortization Expense (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2015 (remaining nine months) $ 26,927,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
2016 25,505,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 19,481,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 15,874,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 10,992,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 16,505,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Net Carrying Value 115,284,000us-gaap_FiniteLivedIntangibleAssetsNet   122,474,000us-gaap_FiniteLivedIntangibleAssetsNet
Amortization of intangible assets $ 6,100,000ent_AmortizationofIntangibleAssetsIncludingValuationAdjustment $ 7,800,000ent_AmortizationofIntangibleAssetsIncludingValuationAdjustment