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Schedule of Prepayments (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 05, 2015	Dec. 31, 2014
Prepaid And Other Current Assets [Line Items]
Contract manufacturer prepayments	$ 62,439ter_ContractAndManufacturerPrepaid	$ 65,972ter_ContractAndManufacturerPrepaid
Prepaid taxes	10,375us-gaap_PrepaidTaxes	11,462us-gaap_PrepaidTaxes
Prepaid maintenance and other services	7,056ter_PrepaidMaintenanceAndOtherServices	7,343ter_PrepaidMaintenanceAndOtherServices
Other prepayments	12,614us-gaap_OtherPrepaidExpenseCurrent	11,042us-gaap_OtherPrepaidExpenseCurrent
Total prepayments	$ 92,484us-gaap_PrepaidExpenseCurrent	$ 95,819us-gaap_PrepaidExpenseCurrent

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