XML 126 R41.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Accounting Policies - Goodwill and Intangibles, Net (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Accounting Policies [Abstract]        
Goodwill impairment charge $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss  
Finite useful life of intangible assets, Minimum 5 years      
Finite useful life of intangible assets, Maximum 50 years      
Finite Lived Intangible Assets Amortization Expenses 4ten_FiniteLivedIntangibleAssetsAmortizationExpenses 5ten_FiniteLivedIntangibleAssetsAmortizationExpenses 5ten_FiniteLivedIntangibleAssetsAmortizationExpenses  
Estimated amortization of intangible assets, 2014 4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths      
Estimated amortization of intangible assets, 2015 3us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo      
Estimated amortization of intangible assets, 2016 3us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree      
Estimated amortization of intangible assets, 2017 2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
Estimated amortization of intangible assets, 2018 1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive      
Capitalization of indefinite life purchased trademarks       $ 1ten_CapitalizationOfIndefiniteLifePurchasedTrademark