Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Details)	6 Months Ended
Jun. 30, 2019
Condensed Financial Information Disclosure [Abstract]
Ownership percentage of existing and future material domestic owned subsidiaries	100.00%

Ownership percentage of existing and future material domestic owned subsidiaries.

No definition available.

Name:	ten_OwnershipPercentageOfExistingAndFutureMaterialDomesticOwnedSubsidiaries
Namespace Prefix:	ten_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration