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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Marketable securities $ 485,707 $ 1,473,905
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash and cash equivalents 814,019 429,843
Marketable securities 510,392 1,473,905
Derivative assets 3 389
Contingent consideration 60,942 45,102
Derivative liabilities 455 446
Convertible debt [1] 376,417 365,987
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash and cash equivalents 814,019 429,843
Marketable securities 510,392 1,473,905
Derivative assets 3 389
Contingent consideration 60,942 45,102
Derivative liabilities 455 446
Convertible debt [1] $ 599,438 $ 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.