Product Revenues, Net, Accounts Receivable and Reserves for Product Revenues - Summary of Change in Reserves for Discounts and Allowances (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 94,698	$ 70,466
Provision	106,559	83,809
Adjustments relating to prior years	(3,437)	(2,198)
Payments/credits	(83,822)	(66,624)
Ending balance	113,998	85,453
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	417	799
Provision	6,287	5,642
Adjustments relating to prior years	0	0
Payments/credits	(6,434)	(6,232)
Ending balance	270	209
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	67,493	60,506
Provision	60,824	52,589
Adjustments relating to prior years	(3,437)	(2,228)
Payments/credits	(45,592)	(43,293)
Ending balance	79,288	67,574
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,343	2,798
Provision	7,228	6,192
Adjustments relating to prior years	0	0
Payments/credits	(6,976)	(5,639)
Ending balance	3,595	3,351
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	23,445	6,363
Provision	32,220	19,386
Adjustments relating to prior years	0	30
Payments/credits	(24,820)	(11,460)
Ending balance	$ 30,845	$ 14,319