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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  | 4 us-gaap_NumberOfOperatingSegments |  |
Number of customers exceeding ten percent of net sales |  |  |  |  |  |  |  |  | 0 tnc_Numberofcustomersexceedingtenpercentofnetsales |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 216,277 us-gaap_SalesRevenueNet | $ 202,643 us-gaap_SalesRevenueNet | $ 219,084 us-gaap_SalesRevenueNet | $ 183,979 us-gaap_SalesRevenueNet | $ 195,140 us-gaap_SalesRevenueNet | $ 188,541 us-gaap_SalesRevenueNet | $ 200,238 us-gaap_SalesRevenueNet | $ 168,092 us-gaap_SalesRevenueNet | $ 821,983 us-gaap_SalesRevenueNet | $ 752,011 us-gaap_SalesRevenueNet | $ 738,980 us-gaap_SalesRevenueNet
Long-Lived Assets | 131,678 us-gaap_NoncurrentAssets |  |  |  | 138,587 us-gaap_NoncurrentAssets |  |  |  | 131,678 us-gaap_NoncurrentAssets | 138,587 us-gaap_NoncurrentAssets | 136,325 us-gaap_NoncurrentAssets
Equipment |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 500,141 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = tnc_EquipmentSalesMember | 444,773 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = tnc_EquipmentSalesMember | 435,900 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = tnc_EquipmentSalesMember
Parts and consumables |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 182,845 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_PublicUtilitiesInventoryReplacementPartsMember | 176,442 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_PublicUtilitiesInventoryReplacementPartsMember | 175,782 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_PublicUtilitiesInventoryReplacementPartsMember
Service and other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 114,027 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SalesRevenueServicesNetMember | 109,533 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SalesRevenueServicesNetMember | 106,048 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SalesRevenueServicesNetMember
Specialty surface coatings |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 24,970 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = tnc_SpecialtySurfaceCoatingsMember | 21,263 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = tnc_SpecialtySurfaceCoatingsMember | 21,250 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = tnc_SpecialtySurfaceCoatingsMember
Americas |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 569,004 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 514,544 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 491,661 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Long-Lived Assets | 103,958 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |  |  |  | 106,409 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |  |  |  | 103,958 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 106,409 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 100,662 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Europe, Middle East, Africa |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 165,686 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 157,208 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 166,208 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Long-Lived Assets | 24,051 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 28,296 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 24,051 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 28,296 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 31,164 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 87,293 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 80,259 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 81,111 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Long-Lived Assets | $ 3,669 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | $ 3,882 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | $ 3,669 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | $ 3,882 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | $ 4,499 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember

X
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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