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Newly Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Discrete tax benefits recognized related to excess tax benefits, Amount | $ 5 | $ 1,149

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- Definition Effective Income Tax Rate Reconciliation, Share Based Compensation, Excess Tax Benefit, Amount + References No definition available. + Details
Name: | tnc_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration