Product Revenues, Net, Accounts Receivable and Reserves for Product Revenues - Summary of Change in Reserves for Discounts and Allowances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 94,698	$ 70,466
Provision	51,454	39,557
Adjustments relating to prior years	(2,162)	(819)
Payments/credits	(48,698)	(26,296)
Ending balance	95,292	82,908
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	417	799
Provision	2,827	2,437
Adjustments relating to prior years	0	0
Payments/credits	(3,244)	(2,906)
Ending balance	0	330
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	67,493	60,506
Provision	30,488	24,989
Adjustments relating to prior years	(2,162)	(849)
Payments/credits	(28,025)	(16,563)
Ending balance	67,794	68,083
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,343	2,798
Provision	3,572	2,950
Adjustments relating to prior years	0	0
Payments/credits	(3,389)	(2,645)
Ending balance	3,526	3,103
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	23,445	6,363
Provision	14,567	9,181
Adjustments relating to prior years	0	30
Payments/credits	(14,040)	(4,182)
Ending balance	$ 23,972	$ 11,392