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Acquisitions (Details) (Water Star, Inc., USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Water Star, Inc.
        
Business Acquisition        
Business Acquisition, Effective Date of Acquisition May 31, 2011      
Business Combination, Consideration Transferred       $ 4,456us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= tnc_WaterStarIncMember
Payments to acquire business, gross       2,956us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= tnc_WaterStarIncMember
Number of installment payments paid to acquire Water Star 2tnc_Numberofinstallmentpaymentspaid
/ us-gaap_BusinessAcquisitionAxis
= tnc_WaterStarIncMember		      
Amount of each installment payment paid   $ 750tnc_Amountofinstallmentpaymentpaid
/ us-gaap_BusinessAcquisitionAxis
= tnc_WaterStarIncMember		 $ 750tnc_Amountofinstallmentpaymentpaid
/ us-gaap_BusinessAcquisitionAxis
= tnc_WaterStarIncMember