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Divestiture (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 31, 2016
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |  |
Date of divestiture |  |  | Jan. 31, 2016 |  |
Total selling price |  |  |  |  | $ 5,774
Loss on Sale of Business | $ 0 | $ 87 | $ 0 | $ 149 |
Relative size of the disposal group compared to the total company, in terms of revenue |  |  | 2.00% |  |

X
- Definition Percentage of revenue of a disposal group relative to the total company's revenue + References No definition available. + Details
Name: | tnc_Relativesizeofthedisposalgroupcomparedtothetotalcompanyintermsofrevenue
Namespace Prefix: | tnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the entity disposed of a business or a group of assets, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DisposalDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DisposalGroupNotDiscontinuedOperationDisposalDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
Name: | us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration