Product Revenues, Net, Accounts Receivable, Net, and Reserves for Product Revenues - Summary of Change in Reserves for Discounts and Allowances (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 164,772	$ 94,698
Provision	158,731	106,559
Adjustments relating to prior periods	(4,476)	(3,437)
Payments/credits	(158,712)	(83,822)
Ending balance	160,315	113,998
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	27,486	417
Provision	41,935	6,287
Adjustments relating to prior periods	783	0
Payments/credits	(54,393)	(6,434)
Ending balance	15,811	270
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	98,194	67,493
Provision	72,684	60,824
Adjustments relating to prior periods	(5,171)	(3,437)
Payments/credits	(62,647)	(45,592)
Ending balance	103,060	79,288
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,831	3,343
Provision	8,585	7,228
Adjustments relating to prior periods	0	0
Payments/credits	(8,462)	(6,976)
Ending balance	3,954	3,595
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	35,261	23,445
Provision	35,527	32,220
Adjustments relating to prior periods	(88)	0
Payments/credits	(33,210)	(24,820)
Ending balance	$ 37,490	$ 30,845