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Revenue from Contracts with Customers (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Contract Liability [Roll Forward] [Roll Forward]
Beginning balance		$ 13,466
Additions to sales incentive accrual	$ 30,458
Contract payments	(26,992)
Foreign currency fluctuations	(280)
Ending balance	$ 16,652

X

- Definition

Contract with Customer, Contract Liability [Roll Forward]

+ References

No definition available.

+ Details

Name:	tnc_ContractwithCustomerContractLiabilityRollForwardRollForward
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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=108792157&loc=SL49130611-203046-203046

+ Details

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

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, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=108792157&loc=SL49130611-203046-203046

+ Details

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