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Schedule of Prepayments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Prepaid And Other Current Assets [Line Items]
Contract manufacturer prepayments	$ 65,972ter_ContractAndManufacturerPrepaid	$ 115,388ter_ContractAndManufacturerPrepaid
Prepaid taxes	11,462us-gaap_PrepaidTaxes	3,281us-gaap_PrepaidTaxes
Prepaid maintenance and other services	7,343ter_PrepaidMaintenanceAndOtherServices	6,538ter_PrepaidMaintenanceAndOtherServices
Other prepayments	11,042us-gaap_OtherPrepaidExpenseCurrent	11,167us-gaap_OtherPrepaidExpenseCurrent
Total prepayments	$ 95,819us-gaap_PrepaidExpenseCurrent	$ 136,374us-gaap_PrepaidExpenseCurrent

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