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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 | $ 68,906 us-gaap_GoodwillGross | $ 68,585 us-gaap_GoodwillGross |
Foreign currency fluctuations | (4,048)us-gaap_GoodwillTranslationAdjustments |  | 321 us-gaap_GoodwillTranslationAdjustments
Balance, end of period | 64,858 us-gaap_GoodwillGross | 68,906 us-gaap_GoodwillGross | 68,585 us-gaap_GoodwillGross
Accumulated Impairment Losses |  |  |
Balance, beginning of period | (49,977)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (48,868)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Foreign currency fluctuations | 3,474 tnc_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 | 18,929 us-gaap_Goodwill | 19,717 us-gaap_Goodwill |
Foreign currency fluctuations | 574 tnc_GoodwillNetForeignCurrencyFluctuations |  | (788)tnc_GoodwillNetForeignCurrencyFluctuations
Balance, end of period | 18,355 us-gaap_Goodwill | 18,929 us-gaap_Goodwill | 19,717 us-gaap_Goodwill
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 33,161 us-gaap_FiniteLivedIntangibleAssetsGross | 35,946 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated amortization | (17,573)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (16,918)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Intangible Assets, Net | 15,588 us-gaap_IntangibleAssetsNetExcludingGoodwill | 19,028 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Amortization expense | 2,369 us-gaap_AmortizationOfIntangibleAssets | 2,560 us-gaap_AmortizationOfIntangibleAssets | 2,800 us-gaap_AmortizationOfIntangibleAssets
Estimated aggregate amortization expense of Intangible Assets |  |  |
2015 | 2,039 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2016 | 1,743 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 1,644 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 1,637 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 1,516 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Thereafter | 7,009 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |
Total | 15,588 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Customer Lists and Service Contracts |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 21,946 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 23,763 us-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 | 9,847 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 12,154 us-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 | 4,300 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 4,836 us-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 | 2,232 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 2,860 us-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 | 6,915 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember | 7,347 us-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 | $ 3,509 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember | $ 4,014 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |
Weighted-average original life (in years) | 13 years | 13 years |

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