Schedule of Net-Book-Value and Estimated Remaining Life of Finite-Lived Intangible Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 456,580
Acquired intellectual property
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 406,058
Average Remaining Life (in years)	7 years 9 months 18 days
Repurchased royalty rights
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 26,438
Average Remaining Life (in years)	3 years 10 months 24 days
Technology Transfer
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 23,078
Other
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 1,006
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Average Remaining Life (in years)	1 year 2 months 12 days
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Average Remaining Life (in years)	4 years 7 months 6 days