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Financial Instruments - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments and Fair Value [Line Items]            
Available-for-sale securities, realized loss       $ 400,000 $ 0 $ 0
Available-for-sale securities, realized gain       1,700,000 2,400,000 1,000,000
Payments of contingent consideration           388,000
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses     $ 583,076,000 601,660,000 583,076,000  
Fair market value of investments with unrealized losses greater than one year     2,300,000 900,000 2,300,000  
Aggregate loss of investments with unrealized losses greater than one year       500,000 100,000  
Fair market value of investments with unrealized losses less than one year     580,800,000 600,800,000 580,800,000  
Aggregate loss of investments with unrealized losses less than one year       3,600,000 800,000  
Goodwill, carrying value     781,058,000 996,033,000 781,058,000 770,515,000
Goodwill, impairment loss     98,897,000 [1],[2],[3]   98,897,000 0
Gains (losses) on foreign currency transactions       2,500,000 (900,000) (6,900,000)
Realized (losses) gains on foreign currency contracts       (3,000,000) (200,000) 5,900,000
Proceeds from sale of equity interest   $ 5,406,000   5,406,000   $ 34,212,000
Equity And Debt Mutual Funds            
Financial Instruments and Fair Value [Line Items]            
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses     1,234,000 2,560,000 1,234,000  
Available for sale securities with out contractual maturity date       14,000,000    
Foreign Currency Forward Contracts            
Financial Instruments and Fair Value [Line Items]            
Gains (losses) on foreign currency transactions       $ 0 (100,000)  
Fair Value, Measurements, Nonrecurring            
Financial Instruments and Fair Value [Line Items]            
Goodwill, carrying value     372,300,000   372,300,000  
Goodwill, fair value     $ 273,438,000   273,438,000  
Goodwill, impairment loss         $ 98,897,000  
Scenario, Forecast | Universal Robots            
Financial Instruments and Fair Value [Line Items]            
Payments of contingent consideration $ 15,000,000          
EBITDA contingent consideration amount, percentage 100.00%          
Accounts Receivable | Customer 1 | Minimum            
Financial Instruments and Fair Value [Line Items]            
Concentration risk, percentage       10.00%    
Accounts Receivable | Customer 2 | Minimum            
Financial Instruments and Fair Value [Line Items]            
Concentration risk, percentage         10.00%  
[1] Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[2] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[3] In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.