Product Revenues, Net, Accounts Receivable and Reserves for Product Revenues - Summary of Change in Reserves for Discounts and Allowances (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 94,698	$ 70,466
Provision	175,967	128,029
Adjustments relating to prior years	(4,044)	(4,081)
Payments/credits	(133,337)	(107,165)
Ending balance	133,284	87,249
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	417	799
Provision	18,191	8,756
Adjustments relating to prior years	110	0
Payments/credits	(9,386)	(9,193)
Ending balance	9,332	362
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	67,493	60,506
Provision	94,025	80,956
Adjustments relating to prior years	(4,154)	(4,111)
Payments/credits	(73,317)	(70,645)
Ending balance	84,047	66,706
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,343	2,798
Provision	11,251	9,508
Adjustments relating to prior years	0	0
Payments/credits	(10,586)	(8,930)
Ending balance	4,008	3,376
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	23,445	6,363
Provision	52,500	28,809
Adjustments relating to prior years	0	30
Payments/credits	(40,048)	(18,397)
Ending balance	$ 35,897	$ 16,805