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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance |  | $ 1,470,228 | $ 1,904,983 | $ 1,522,354 | $ 1,953,646
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  |  |  |  |
Other comprehensive income (loss) |  | 8,115 | (29,385) | 5,449 | (19,924)
Less: reclassification adjustment for (gains) losses included in net income, net of tax |  | (27) | (199) | (97) | 1,469
Balance |  | 1,479,412 | 1,739,940 | 1,479,412 | 1,739,940
ASU 2016-01 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Less: reclassification adjustment for (gains) losses included in net income, net of tax | [1] |  |  |  | (3,125)
Foreign Currency Translation Reclassification Adjustments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance |  |  |  | (12,523) | 15,919
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  | 983 | (18,781)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  |  |  |  |
Other comprehensive income (loss) |  |  |  | 983 | (18,781)
Balance |  | (11,540) | (2,862) | (11,540) | (2,862)
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance |  |  |  | (1,845) | 1,362
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  | 4,637 | (2,489)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  |  |  | (97) | 1,469
Other comprehensive income (loss) |  |  |  | 4,540 | (1,020)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax | [2] |  |  |  | 691
Less: reclassification adjustment for (gains) losses included in net income, net of tax | [1] |  |  |  | (3,125)
Balance |  | 2,695 | (2,092) | 2,695 | (2,092)
Amortization of Prior Service Credit |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance |  |  |  | 1,328 | 1,495
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (37) | (61) | (74) | (123)
Other comprehensive income (loss) |  |  |  | (74) | (123)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax | [2] |  |  |  | 78
Balance |  | 1,254 | 1,450 | 1,254 | 1,450
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance |  | (15,706) | 25,881 | (13,040) | 18,776
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  | 5,620 | (21,270)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (64) | (260) | (171) | (769)
Other comprehensive income (loss) |  | 8,115 | (29,385) | 5,449 | (19,924)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax | [2] |  |  |  | 769
Less: reclassification adjustment for (gains) losses included in net income, net of tax |  | 27 | 199 | 97 | (1,469)
Balance |  | $ (7,591) | $ (3,504) | $ (7,591) | $ (3,504)
[1] | In the six months ended July 1, 2018, Teradyne adopted the ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.”
[2] | In the six months ended July 1, 2018, Teradyne early adopted the ASU 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” As a result, the stranded tax effects resulting from the Tax Reform Act enacted in December 2017 were reclassified from accumulated other comprehensive income to retained earnings.

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