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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Aggregate residual value at lease expiration for vehicle leases	$ 11,316tnc_AggregateResidualValueAtLeaseExpirationForVehicleLeases
Guaranteed aggregate residual value at lease expiration for vehicle leases	9,171us-gaap_GuaranteeObligationsMaximumExposure
Liability for the estimated end-of-term loss related to residual value guarantee	$ 183us-gaap_GuaranteeObligationsCurrentCarryingValue

X

- Definition

The aggregate residual value at lease expiration for vehicle leases.

+ References

No definition available.

+ Details

Name:	tnc_AggregateResidualValueAtLeaseExpirationForVehicleLeases
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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