Product Revenues, Net, Accounts Receivable, Net and Reserves for Product RevenuesProduct Revenues, Net, Accounts Receivable, Net and Reserves for Product Revenues - Summary of Change in Reserves for Discounts and Allowances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 164,772	$ 94,698
Provision	79,763	51,454
Adjustments relating to prior periods	(1,749)	(2,162)
Payments/credits	(86,886)	(48,698)
Ending balance	155,900	95,292
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	27,486	417
Provision	20,466	2,827
Adjustments relating to prior periods	783	0
Payments/credits	(30,358)	(3,244)
Ending balance	18,377	0
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	98,194	67,493
Provision	35,951	30,488
Adjustments relating to prior periods	(2,532)	(2,162)
Payments/credits	(36,623)	(28,025)
Ending balance	94,990	67,794
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,831	3,343
Provision	4,381	3,572
Adjustments relating to prior periods	0	0
Payments/credits	(3,685)	(3,389)
Ending balance	4,527	3,526
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	35,261	23,445
Provision	18,965	14,567
Adjustments relating to prior periods	0	0
Payments/credits	(16,220)	(14,040)
Ending balance	$ 38,006	$ 23,972