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Divestiture (Details)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2015
EUR (€)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
EUR (€)
Dec. 31, 2012
USD ($)
Jul. 31, 2014
USD ($)
Jul. 31, 2014
EUR (€)
Jul. 31, 2013
USD ($)
Jul. 31, 2013
EUR (€)
Jul. 31, 2012
USD ($)
Jul. 31, 2012
EUR (€)
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]                      
Date of divestiture Jul. 31, 2012 Jul. 31, 2012                  
Cash received as part of the selling price                   $ 1,014tnc_Paymentsrecievedfromdivestedbusinessesgross € 815tnc_Paymentsrecievedfromdivestedbusinessesgross
Amount financed as part of selling price                     5,351tnc_Amountfinancedaspartofsellingprice
Total selling price                     6,166us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Total amount of installment payments received quarterly in 2013     2,826tnc_Amountofinstallmentpaymentsreceivedquarterly2013 2,126tnc_Amountofinstallmentpaymentsreceivedquarterly2013              
Total amount of first anniversary payment received               1,435tnc_Firstanniversarypaymentreceived 1,075tnc_Firstanniversarypaymentreceived    
Total amount of second anniversary payment received           1,418tnc_Secondanniversarypaymentreceived 1,075tnc_Secondanniversarypaymentreceived        
Remaining amount of payments remaining to be received on the third anniversary date 1,153tnc_RemainingAmountOfPaymentsRemainingTobeReceivedOnThirdAnniversaryDate 1,075tnc_RemainingAmountOfPaymentsRemainingTobeReceivedOnThirdAnniversaryDate                  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal         $ 784us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss