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, 2025	Jun. 30, 2024
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	$ 194,299	$ 164,772
Provision	297,792	158,731
Adjustments relating to prior periods	(10,122)	(4,476)
Payments/credits	(249,244)	(158,712)
Ending Balance	232,725	160,315
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	45,904	27,486
Provision	131,842	41,935
Adjustments relating to prior periods	0	783
Payments/credits	(130,222)	(54,393)
Ending Balance	47,524	15,811
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	107,843	98,194
Provision	109,973	72,684
Adjustments relating to prior periods	(9,497)	(5,171)
Payments/credits	(64,359)	(62,647)
Ending Balance	143,960	103,060
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	5,941	3,831
Provision	10,965	8,585
Adjustments relating to prior periods	0	0
Payments/credits	(11,251)	(8,462)
Ending Balance	5,655	3,954
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	34,611	35,261
Provision	45,012	35,527
Adjustments relating to prior periods	(625)	(88)
Payments/credits	(43,412)	(33,210)
Ending Balance	$ 35,586	$ 37,490