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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Goodwill, Gross
Balance, beginning of period	$ 64,858us-gaap_GoodwillGross
Foreign currency fluctuations	(3,492)us-gaap_GoodwillTranslationAdjustments
Balance, end of period	61,366us-gaap_GoodwillGross
Accumulated Impairment Losses
Balance, beginning of period	(46,503)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Foreign currency fluctuations	2,694tnc_ImpairmentLossesForeignCurrencyFluctuations
Balance, end of period	(43,809)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Net
Balance, beginning of period	18,355us-gaap_Goodwill
Foreign currency fluctuations	(798)tnc_GoodwillNetForeignCurrencyFluctuations
Balance, end of period	17,557us-gaap_Goodwill
Acquired Finite-lived Intangible Assets
Original cost	30,698us-gaap_FiniteLivedIntangibleAssetsGross		33,161us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization	(16,477)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization		(17,573)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net	14,221us-gaap_IntangibleAssetsNetExcludingGoodwill		15,588us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense	520us-gaap_AmortizationOfIntangibleAssets	611us-gaap_AmortizationOfIntangibleAssets
Estimated aggregate amortization expense of Intangible Assets
Remaining 2015	1,390us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016	1,639us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017	1,542us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018	1,536us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019	1,428us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter	6,686us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total	14,221us-gaap_FiniteLivedIntangibleAssetsNet
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	20,324us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember		21,946us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Accumulated amortization	(11,356)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember		(12,099)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Intangible Assets, Net	8,968us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember		9,847us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Weighted-average original life	15 years		15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	3,812us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember		4,300us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Accumulated amortization	(1,903)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember		(2,068)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Intangible Assets, Net	1,909us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember		2,232us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Weighted-average original life	14 years		14 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	6,562us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember		6,915us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Accumulated amortization	(3,218)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember		(3,406)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Intangible Assets, Net	$ 3,344us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember		$ 3,509us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Weighted-average original life	13 years		13 years

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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