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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 1,760 $ 2,250 $ 1,924
Additions Acquisition Beginning Balance 1,292    
Additions Charged to Costs and Expenses 1,109 (255) 668
Additions Charged to Other Accounts (66) 21 12
Deductions & Write-offs (186) (256) (354)
Balance at End of Year 3,909 1,760 2,250
Valuation Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 601 730 827
Additions Acquisition Beginning Balance 423    
Additions Charged to Costs and Expenses 2,262 2,500 2,223
Additions Charged to Other Accounts   (3)  
Deductions & Write-offs (2,148) (2,626) (2,320)
Balance at End of Year 1,138 601 730
Valuation Allowance on Deferred Tax Asset [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 6,127 26,763 27,102
Additions Acquisition Beginning Balance 3,769    
Additions Charged to Costs and Expenses 2,719    
Additions Charged to Other Accounts   113  
Deductions & Write-offs (88) (20,749) (339)
Balance at End of Year $ 12,527 $ 6,127 $ 26,763