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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.