Annual report pursuant to Section 13 and 15(d)

Intangible Assets, net - Amortization Expense (Details)

v2.4.1.9
Intangible Assets, net - Amortization Expense (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2015 $ 33,974,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
2016 25,679,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 19,464,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 15,874,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 10,992,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 16,491,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Net Carrying Value 122,474,000us-gaap_FiniteLivedIntangibleAssetsNet 142,977,000us-gaap_FiniteLivedIntangibleAssetsNet  
Amortization of intangible assets $ 27,200,000ent_AmortizationofIntangibleAssetsIncludingValuationAdjustment $ 17,300,000ent_AmortizationofIntangibleAssetsIncludingValuationAdjustment $ 0ent_AmortizationofIntangibleAssetsIncludingValuationAdjustment