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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Doubtful Accounts |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period | $ 2,491 | $ 2,912 | $ 4,118 |
Additions Charged to Cost and Expenses |  | 55 | 69 |
Deductions | 84 | 476 | 1,275 | [1]
Balance at End of Period | 2,407 | 2,491 | 2,912 |
Inventory Reserve |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period | 111,252 | 115,857 | 141,838 |
Additions Charged to Cost and Expenses | 21,332 | 22,193 | 16,592 |
Other | 1,680 | 7,064 | 2,568 |
Deductions | 14,888 | 33,862 | 45,141 |
Balance at End of Period | 119,376 | 111,252 | 115,857 |
Valuation Allowance of Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period | 41,737 | 40,386 | 55,446 |
Additions Charged to Cost and Expenses | 1,322 | 1,380 | 4,546 |
Deductions | 20 | 29 | 19,606 |
Balance at End of Period | $ 43,039 | $ 41,737 | $ 40,386 |
[1] | Based upon an improvement in the aging of accounts receivables in 2013, Teradyne reduced its allowance for doubtful accounts by approximately $1 million.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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