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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill, Gross
Balance, beginning of period	$ 68,906us-gaap_GoodwillGross	$ 68,585us-gaap_GoodwillGross
Foreign currency fluctuations	(4,048)us-gaap_GoodwillTranslationAdjustments		321us-gaap_GoodwillTranslationAdjustments
Balance, end of period	64,858us-gaap_GoodwillGross	68,906us-gaap_GoodwillGross	68,585us-gaap_GoodwillGross
Accumulated Impairment Losses
Balance, beginning of period	(49,977)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(48,868)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Foreign currency fluctuations	3,474tnc_ImpairmentLossesForeignCurrencyFluctuations		(1,109)tnc_ImpairmentLossesForeignCurrencyFluctuations
Balance, end of period	(46,503)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(49,977)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(48,868)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Net
Balance, beginning of period	18,929us-gaap_Goodwill	19,717us-gaap_Goodwill
Foreign currency fluctuations	574tnc_GoodwillNetForeignCurrencyFluctuations		(788)tnc_GoodwillNetForeignCurrencyFluctuations
Balance, end of period	18,355us-gaap_Goodwill	18,929us-gaap_Goodwill	19,717us-gaap_Goodwill
Acquired Finite-lived Intangible Assets
Original cost	33,161us-gaap_FiniteLivedIntangibleAssetsGross	35,946us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization	(17,573)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(16,918)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net	15,588us-gaap_IntangibleAssetsNetExcludingGoodwill	19,028us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense	2,369us-gaap_AmortizationOfIntangibleAssets	2,560us-gaap_AmortizationOfIntangibleAssets	2,800us-gaap_AmortizationOfIntangibleAssets
Estimated aggregate amortization expense of Intangible Assets
2015	2,039us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016	1,743us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017	1,644us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018	1,637us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019	1,516us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter	7,009us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total	15,588us-gaap_FiniteLivedIntangibleAssetsNet
Customer Lists and Service Contracts
Acquired Finite-lived Intangible Assets
Original cost	21,946us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember	23,763us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Accumulated amortization	(12,099)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember	(11,609)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Intangible Assets, Net	9,847us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember	12,154us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Weighted-average original life (in years)	15 years	15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	4,300us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	4,836us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Accumulated amortization	(2,068)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	(1,976)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Intangible Assets, Net	2,232us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	2,860us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Weighted-average original life (in years)	14 years	14 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	6,915us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember	7,347us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Accumulated amortization	(3,406)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember	(3,333)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Intangible Assets, Net	$ 3,509us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember	$ 4,014us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Weighted-average original life (in years)	13 years	13 years

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