Summary of Other (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Nonoperating Income Expense [Abstract]
Interest expense	$ (15,651)	$ (13,615)
Interest income	59	2,139
Amortization of investment discount	136	2,964
Gain from sale of Priority Review Voucher		108,069
Other (expense) income, net	(72)	1,092
Total other (loss) income	$ (15,528)	$ 100,649