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Divestiture (Details) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2015 EUR (€) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 EUR (€) | Dec. 31, 2012 USD ($) | Jul. 31, 2014 USD ($) | Jul. 31, 2014 EUR (€) | Jul. 31, 2013 USD ($) | Jul. 31, 2013 EUR (€) | Jul. 31, 2012 USD ($) | Jul. 31, 2012 EUR (€)
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Date of divestiture | Jul. 31, 2012 | Jul. 31, 2012 |  |  |  |  |  |  |  |  |
Cash received as part of the selling price |  |  |  |  |  |  |  |  |  | $ 1,014 tnc_Paymentsrecievedfromdivestedbusinessesgross | € 815 tnc_Paymentsrecievedfromdivestedbusinessesgross
Amount financed as part of selling price |  |  |  |  |  |  |  |  |  |  | 5,351 tnc_Amountfinancedaspartofsellingprice
Total selling price |  |  |  |  |  |  |  |  |  |  | 6,166 us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Total amount of installment payments received quarterly in 2013 |  |  | 2,826 tnc_Amountofinstallmentpaymentsreceivedquarterly2013 | 2,126 tnc_Amountofinstallmentpaymentsreceivedquarterly2013 |  |  |  |  |  |  |
Total amount of first anniversary payment received |  |  |  |  |  |  |  | 1,435 tnc_Firstanniversarypaymentreceived | 1,075 tnc_Firstanniversarypaymentreceived |  |
Total amount of second anniversary payment received |  |  |  |  |  | 1,418 tnc_Secondanniversarypaymentreceived | 1,075 tnc_Secondanniversarypaymentreceived |  |  |  |
Remaining amount of payments remaining to be received on the third anniversary date | 1,153 tnc_RemainingAmountOfPaymentsRemainingTobeReceivedOnThirdAnniversaryDate | 1,075 tnc_RemainingAmountOfPaymentsRemainingTobeReceivedOnThirdAnniversaryDate |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  | $ 784 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss |  |  |  |  |  |

X
- Definition The amount financed associated with the divestment of businesses during the period. The finance portion only of the selling price. + References No definition available. + Details
Name: | tnc_Amountfinancedaspartofsellingprice
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The total amount of quarterly installment payments received during 2013 as part of these business divestitures. + References No definition available. + Details
Name: | tnc_Amountofinstallmentpaymentsreceivedquarterly2013
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of first anniversary payment received as part of this business divestitures + References No definition available. + Details
Name: | tnc_Firstanniversarypaymentreceived
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow associated with the divestment of businesses during the period. The cash portion only of the selling price. + References No definition available. + Details
Name: | tnc_Paymentsrecievedfromdivestedbusinessesgross
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The total remaining amount of payments to be received on the third anniversary date as part of these business divestitures. + References No definition available. + Details
Name: | tnc_RemainingAmountOfPaymentsRemainingTobeReceivedOnThirdAnniversaryDate
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The total amount of second anniversary payment received as part of this business divestiture. + References No definition available. + Details
Name: | tnc_Secondanniversarypaymentreceived
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
- Definition Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DisposalGroupNotDiscontinuedOperationDisposalDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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