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- Proforma Consolidated Leverage Ratio (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Greater than or equal to 3.0x      
Line of Credit Facility [Line Items]      
Maximum aggregate principal amount of purchases, cancellations and redemptions of senior notes 20ten_MaximumAggregatePrincipalAmountOfPurchasesCancellationsAndRedemptionsOfSeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= ten_LeverageRatioGreaterThanOrEqualToThreeMember		    
Greater than or equal to 2.5x      
Line of Credit Facility [Line Items]      
Maximum aggregate principal amount of purchases, cancellations and redemptions of senior notes 100ten_MaximumAggregatePrincipalAmountOfPurchasesCancellationsAndRedemptionsOfSeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= ten_LeverageRatioGreaterThanOrEqualToTwoPointFiveMember		    
Greater than or equal to 2.0x      
Line of Credit Facility [Line Items]      
Maximum aggregate principal amount of purchases, cancellations and redemptions of senior notes 200ten_MaximumAggregatePrincipalAmountOfPurchasesCancellationsAndRedemptionsOfSeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= ten_LeverageRatioGreaterThanOrEqualToTwoPointZeroMember		    
Less than 2.0x      
Line of Credit Facility [Line Items]      
Less than 2.0x no limit    
Europe      
Line of Credit Facility [Line Items]      
Financing Cost Related To Sale Of Securitized Receivables 2.00%ten_FinancingCostRelatedToSaleOfSecuritizedReceivables
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 3.00%ten_FinancingCostRelatedToSaleOfSecuritizedReceivables
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 3.00%ten_FinancingCostRelatedToSaleOfSecuritizedReceivables
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember