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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance, beginning of year $ 1,761 $ 1,695 $ 2,081
Provision 695 (152) 32
Write-offs, recoveries and discounts allowed (688)   (363)
Other (107) 218 (55)
Balance, end of year 1,661 1,761 1,695
Allowance for Sales Discounts and Deductions [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance, beginning of year 1,029 925 1,301
Provision 2,075 1,191 690
Write-offs, recoveries and discounts allowed (2,294) (1,159) (1,054)
Other 22 72 (12)
Balance, end of year $ 832 $ 1,029 $ 925