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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 6,663 $ 5,209 $ 3,996
Additions Due to acquisitions   469  
Additions Charged to costs and expenses 6,730 11,397 6,264
Deductions (8,093) (10,412) (5,051)
Balance at end of period 5,300 6,663 5,209
Allowance for Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 815 473 361
Additions Due to acquisitions   119  
Additions Charged to costs and expenses 226 401 260
Deductions [1] (344) (178) (148)
Balance at end of period 697 815 473
Allowance for Sales Returns      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 5,848 4,736 3,635
Additions Due to acquisitions   350  
Additions Charged to costs and expenses [2] 6,504 10,996 6,004
Deductions [3] (7,749) (10,234) (4,903)
Balance at end of period $ 4,603 $ 5,848 $ 4,736
[1] Uncollectible accounts written off, net of recoveries.
[2] Charged to net sales.
[3] Allowances granted.