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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at beginning of period $ 6,190 $ 5,725 $ 5,300 $ 6,663
Additions Due to acquisitions 421 0 0 0
Additions Charged to costs and expenses 5,082 4,926 5,237 6,730
Deductions (3,838) (4,461) (4,812) (8,093)
Balance at end of period 7,855 6,190 5,725 5,300
Allowance for Doubtful Accounts        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at beginning of period 1,158 648 697 815
Additions Due to acquisitions 0 0 0 0
Additions Charged to costs and expenses 786 594 127 226
Deductions [1] (448) (84) (176) (344)
Balance at end of period 1,496 1,158 648 697
Allowance for Sales Returns        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at beginning of period 5,032 5,077 4,603 5,848
Additions Due to acquisitions 421 0 0 0
Additions Charged to costs and expenses [2] 4,296 4,332 5,110 6,504
Deductions [3] (3,390) (4,377) (4,636) (7,749)
Balance at end of period $ 6,359 $ 5,032 $ 5,077 $ 4,603
[1] Uncollectible accounts written off, net of recoveries.
[2] Charged to net sales.
[3] Allowances granted.