Summary of Change in Reserves for Discounts and Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 50,970	$ 51,503
Provision	117,452	78,439
Payments/credits	97,956	78,972
Ending balance	70,466	50,970
Chargebacks [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,281	588
Provision	13,308	9,700
Payments/credits	14,790	8,007
Ending balance	799	2,281
Rebates [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	41,771	44,738
Provision	78,637	52,180
Payments/credits	59,902	55,147
Ending balance	60,506	41,771
Prompt Pay [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,949	1,506
Provision	9,400	6,384
Payments/credits	8,551	5,941
Ending balance	2,798	1,949
Other Accruals [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,969	4,671
Provision	16,107	10,175
Payments/credits	14,713	9,877
Ending balance	$ 6,363	$ 4,969