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- Summary of Long-Term Debt Obligations (Parenthetical) (Detail)
Dec. 31, 2014
Dec. 31, 2013
Revolver Borrowings due 2017    
Debt Instrument [Line Items]    
Average effective interest rate 2.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_RevolverBorrowingDueTwoThousandSeventeenMember		 2.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_RevolverBorrowingDueTwoThousandSeventeenMember
Senior Term Loan due 2014 through 2017    
Debt Instrument [Line Items]    
Average effective interest rate 2.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorLoansMember		 2.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorLoansMember
7 3/4% Senior Notes due 2018    
Debt Instrument [Line Items]    
Stated interest rate 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_SevenPointSevenFivePercentageSeniorNotesDueTwoThousandEighteenMember		 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_SevenPointSevenFivePercentageSeniorNotesDueTwoThousandEighteenMember
6 7/8% Senior Notes due 2020    
Debt Instrument [Line Items]    
Stated interest rate 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_SixPointEightSevenSeniorNotesDueTwoThousandTwentyMember		 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_SixPointEightSevenSeniorNotesDueTwoThousandTwentyMember
Debentures due 2013 through 2025    
Debt Instrument [Line Items]    
Average effective interest rate 7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_DebenturesDueTwoThousandThirteenThroughTwoThousandTwentyFiveMember		 7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_DebenturesDueTwoThousandThirteenThroughTwoThousandTwentyFiveMember
CHINA    
Debt Instrument [Line Items]    
Average effective interest rate 5.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= country_CN		 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= country_CN
Notes due 2013 through 2025    
Debt Instrument [Line Items]    
Average effective interest rate 1.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_NotesDueTwoThousandThirteenThroughTwoThousandTwentyFiveMember		 1.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ten_NotesDueTwoThousandThirteenThroughTwoThousandTwentyFiveMember