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, 2026	Jun. 30, 2025
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	$ 200,036	$ 194,299
Provision	176,282	297,792
Adjustments relating to prior periods	(5,936)	(10,122)
Payments/credits	(184,786)	(249,244)
Ending Balance	185,596	232,725
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	25,563	45,904
Provision	48,056	131,842
Adjustments relating to prior periods	0	0
Payments/credits	(52,925)	(130,222)
Ending Balance	20,694	47,524
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	116,585	107,843
Provision	78,427	109,973
Adjustments relating to prior periods	(4,486)	(9,497)
Payments/credits	(72,801)	(64,359)
Ending Balance	117,725	143,960
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	3,831	5,941
Provision	7,598	10,965
Adjustments relating to prior periods	(1,429)	0
Payments/credits	(5,994)	(11,251)
Ending Balance	4,006	5,655
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning Balance	54,057	34,611
Provision	42,201	45,012
Adjustments relating to prior periods	(21)	(625)
Payments/credits	(53,066)	(43,412)
Ending Balance	$ 43,171	$ 35,586