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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Dec. 31, 2018
Financial Instruments and Fair Value [Line Items]          
Available-for-sale securities, realized gain $ 100,000 $ 100,000 $ 200,000 $ 400,000  
Available-for-sale securities, realized loss 100,000     1,500,000  
Available-for-sale marketable securities, Fair Market Value of Investments in debt securities with Unrealized Losses 38,277,000   38,277,000   $ 191,978,000
Fair market value of investments with unrealized losses greater than one year 22,700,000   22,700,000   28,500,000
Aggregate loss of investments with unrealized losses greater than one year 400,000   400,000   1,600,000
Fair market value of investments with unrealized losses less than one year 15,600,000   15,600,000   163,500,000
Aggregate loss of investments with unrealized losses less than one year 100,000   100,000   1,400,000
Unrealized Gain (loss) on contracts 1,300,000 1,900,000 1,900,000 2,500,000  
Equity securities unrealized gain loss 900,000 $ 400,000 3,700,000 $ 400,000  
Debt Mutual Funds          
Financial Instruments and Fair Value [Line Items]          
Available for sale securities with out contractual maturity date 3,300,000   3,300,000    
Mobile Industrial Robots (MiR)          
Financial Instruments and Fair Value [Line Items]          
Maximum amount of contingent consideration paid for acquisition $ 84,100,000   84,100,000    
Foreign Exchange Contracts          
Financial Instruments and Fair Value [Line Items]          
Unrealized Gain (loss) on contracts     $ 143,300,000   $ 163,100,000