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Revenue from Contracts with Customers (Details 2) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Contract with Customer, Contract Liability [Roll Forward]
Beginning balance	$ 13,466
Additions to sales incentive accrual	14,904
Contract payments	(16,785)
Foreign currency fluctuations	(195)
Ending balance	$ 11,390

X

- Definition

Contract with Customer, Contract Liability

+ References

No definition available.

+ Details

Name:	tnc_ContractwithCustomerContractLiabilityRollForward
Namespace Prefix:	tnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Contract Payments

+ References

No definition available.

+ Details

Name:	tnc_ContractwithCustomerLiabilityContractPayments
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Impact of Foreign Currency

+ References

No definition available.

+ Details

Name:	tnc_ContractwithCustomerLiabilityImpactofForeignCurrency
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Increase (Decrease) for Sales Incentive Accruals

+ References

No definition available.

+ Details

Name:	tnc_ContractwithCustomerLiabilityIncreaseDecreaseforSalesIncentiveAccruals
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130609-203046-203046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130607-203046-203046

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL51751984-203043

+ Details

Name:	us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant