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Deferred Revenue and Customer Advances (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 05, 2015
Dec. 31, 2014
Mar. 30, 2014
Dec. 31, 2013
Deferred Revenue Arrangement        
Extended warranty $ 40,704us-gaap_ExtendedProductWarrantyAccrual $ 43,300us-gaap_ExtendedProductWarrantyAccrual $ 33,949us-gaap_ExtendedProductWarrantyAccrual $ 34,909us-gaap_ExtendedProductWarrantyAccrual
Product maintenance and training 29,820ter_DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining 30,500ter_DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining    
Customer advances 8,884us-gaap_CustomerAdvancesAndDeposits 8,875us-gaap_CustomerAdvancesAndDeposits    
Undelivered elements and other 13,162ter_DeferredRevenueAndCustomerAdvancesUndeliveredElementsAndOther 8,857ter_DeferredRevenueAndCustomerAdvancesUndeliveredElementsAndOther    
Total deferred revenue and customer advances $ 92,570ter_DeferredRevenueAndCustomerAdvances $ 91,532ter_DeferredRevenueAndCustomerAdvances