Summary of Other (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Nonoperating Income Expense [Abstract]
Interest expense	$ (15,995)	$ (13,889)	$ (47,477)	$ (41,217)
Interest income	148	122	259	2,899
Amortization of investment discount	0	313	157	4,276
Gain from sale of Priority Review Voucher			102,000	108,069
Gain (loss) on contingent consideration, net	7,200	(45,000)	7,200	(45,000)
Impairment of equity investment	(4,488)		(4,488)
Other (expense) income, net	(314)	(881)	(813)	(160)
Total other (loss) income	$ (13,449)	$ (59,335)	$ 56,838	$ 28,867