Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	$ 1,682	$ 1,661	$ 1,761
Provision	488	720	695
Write-offs, recoveries and discounts allowed	(114)	(678)	(688)
Other	37	(21)	(107)
Balance, end of year	2,093	1,682	1,661
Allowance for Sales Discounts and Deductions [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	578	832	1,029
Provision	1,516	1,440	2,075
Write-offs, recoveries and discounts allowed	(1,291)	(1,526)	(2,294)
Other	(12)	(168)	22
Balance, end of year	$ 791	$ 578	$ 832