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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 1,522,354 $ 1,953,646
Other comprehensive income (loss) before reclassifications, net of tax (2,559) 7,854
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (107) 0
Other comprehensive (loss) income (2,666) 9,461
Reclassification of tax effects resulting from the Tax Reform Act, net of tax [1]   769
Less: reclassification adjustment for gains included in net income, net of tax (70) 1,668
Balance 1,470,228 1,904,983
ASU 2016-01    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Less: reclassification adjustment for gains included in net income, net of tax [2]   (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 (4,659) 10,541
Other comprehensive (loss) income (4,659) 10,541
Balance (17,182) 26,460
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 2,100 (2,687)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (70) 1,668
Other comprehensive (loss) income 2,030 (1,019)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax [1]   691
Balance 185 (2,091)
Unrealized Gains (Losses) on Marketable Securities | ASU 2016-01    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Less: reclassification adjustment for gains included in net income, net of tax [2]   (3,125)
Amortization of Prior Service Credit    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 1,328 1,495
Amounts reclassified from accumulated other comprehensive income (loss), net of tax [3] (37) (61)
Other comprehensive (loss) income (37) (61)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax [1]   78
Balance 1,291 1,512
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (13,040) 18,776
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (107) (769)
Less: reclassification adjustment for gains included in net income, net of tax (70) 1,668
Balance $ (15,706) $ 25,881
[1] In the three months ended April 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.
[2] In the three months ended April 1, 2018, Teradyne adopted the ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.”
[3] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit. See Note R: “Retirement Plans.”