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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 1,953,646 $ 1,828,659 $ 1,965,786
Other comprehensive income (loss) before reclassifications, net of tax (30,552) 39,703  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 (713)  
Other comprehensive (loss) income (29,460) 38,990 (12,070)
Reclassification of tax effects resulting from the Tax Reform Act, net of tax [1] 769    
Reclassification of unrealized gains on equity securities, net of tax 1,337 (441) (683)
Balance 1,522,354 1,953,646 1,828,659
ASU 2016-01      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification of unrealized gains on equity securities, net of tax [2] (3,125)    
Foreign Currency Translation Reclassification Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 15,919 (21,921)  
Other comprehensive income (loss) before reclassifications, net of tax (28,442) 37,840  
Other comprehensive (loss) income (28,442) 37,840  
Balance (12,523) 15,919 (21,921)
Unrealized Gains (Losses) on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 1,362 (60)  
Other comprehensive income (loss) before reclassifications, net of tax (2,110) 1,863  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1,337 (441)  
Other comprehensive (loss) income (773) 1,422  
Reclassification of tax effects resulting from the Tax Reform Act, net of tax [1] 691    
Balance (1,845) 1,362 (60)
Unrealized Gains (Losses) on Marketable Securities | ASU 2016-01      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification of unrealized gains on equity securities, net of tax [2] (3,125)    
Amortization of Prior Service Credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 1,495 1,767  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (245) (272) (321)
Other comprehensive (loss) income (245) (272)  
Reclassification of tax effects resulting from the Tax Reform Act, net of tax [1] 78    
Balance 1,328 1,495 1,767
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 18,776 (20,214) (8,144)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (769) (713) (1,004)
Reclassification of unrealized gains on equity securities, net of tax 1,337 (441) (683)
Balance $ (13,040) $ 18,776 $ (20,214)
[1] In the year ended December 31, 2018, Teradyne early adopted 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 year ended December 31, 2018, Teradyne adopted ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” See Note B: “Accounting Policies.”