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Revenue Percent by Major Customers (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
General Motors      
Revenue, Major Customer [Line Items]      
Customer accounted for ten percent or more of net sales 15.00%ten_EntityWideRevenueMajorCustomerPercent
/ us-gaap_MajorCustomersAxis
= ten_GeneralMotorsMember		 15.00%ten_EntityWideRevenueMajorCustomerPercent
/ us-gaap_MajorCustomersAxis
= ten_GeneralMotorsMember		 17.00%ten_EntityWideRevenueMajorCustomerPercent
/ us-gaap_MajorCustomersAxis
= ten_GeneralMotorsMember
Ford      
Revenue, Major Customer [Line Items]      
Customer accounted for ten percent or more of net sales 13.00%ten_EntityWideRevenueMajorCustomerPercent
/ us-gaap_MajorCustomersAxis
= ten_FordMember		 14.00%ten_EntityWideRevenueMajorCustomerPercent
/ us-gaap_MajorCustomersAxis
= ten_FordMember		 15.00%ten_EntityWideRevenueMajorCustomerPercent
/ us-gaap_MajorCustomersAxis
= ten_FordMember