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Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Revenue Arrangement
Extended warranty	$ 43,300us-gaap_ExtendedProductWarrantyAccrual	$ 34,909us-gaap_ExtendedProductWarrantyAccrual	$ 28,044us-gaap_ExtendedProductWarrantyAccrual	$ 14,030us-gaap_ExtendedProductWarrantyAccrual
Equipment maintenance and training	30,500ter_DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining	22,455ter_DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining
Customer advances	8,875us-gaap_CustomerAdvancesAndDeposits	4,825us-gaap_CustomerAdvancesAndDeposits
Undelivered elements	8,857ter_DeferredRevenueAndCustomerAdvancesUndeliveredElements	6,971ter_DeferredRevenueAndCustomerAdvancesUndeliveredElements
Total deferred revenue and customer advances	$ 91,532ter_DeferredRevenueAndCustomerAdvances	$ 69,160ter_DeferredRevenueAndCustomerAdvances

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- Definition

Total deferred revenue and customer advances.

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Deferred revenue and customer advances maintenance and training.

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Deferred revenue and customer advances undelivered elements.

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- Definition

Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15a)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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