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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 5,300 $ 6,663 $ 5,209
Additions Due to acquisitions     469
Additions Charged to costs and expenses 5,237 6,730 11,397
Deductions (4,812) (8,093) (10,412)
Balance at end of period 5,725 5,300 6,663
Allowance for Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 697 815 473
Additions Due to acquisitions     119
Additions Charged to costs and expenses 127 226 401
Deductions [1] (176) (344) (178)
Balance at end of period 648 697 815
Allowance for Sales Returns      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 4,603 5,848 4,736
Additions Due to acquisitions     350
Additions Charged to costs and expenses [2] 5,110 6,504 10,996
Deductions [3] (4,636) (7,749) (10,234)
Balance at end of period $ 5,077 $ 4,603 $ 5,848
[1] Uncollectible accounts written off, net of recoveries.
[2] Charged to net sales.
[3] Allowances granted.