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

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