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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jul. 01, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Marketable securities $ 800,437 $ 1,473,905
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash and cash equivalents 480,384 429,843
Marketable securities 823,726 1,473,905
Derivative assets 7 389
Contingent consideration 60,914 45,102
Derivative liabilities 253 446
Convertible debt [1] 372,897 365,987
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash and cash equivalents 480,384 429,843
Marketable securities 823,726 1,473,905
Derivative assets 7 389
Contingent consideration 60,914 45,102
Derivative liabilities 253 446
Convertible debt [1] $ 612,693 $ 659,525
[1] The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note, which includes the equity conversion features.