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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 2,250 $ 1,924 $ 2,078
Additions Charged to Costs and Expenses (255) 668 631
Additions Charged to Other Accounts 21 12 (62)
Deductions & Write-offs (256) (354) (723)
Balance at End of Year 1,760 2,250 1,924
Valuation Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 730 827 801
Additions Charged to Costs and Expenses 2,500 2,223 1,933
Additions Charged to Other Accounts (3)   (36)
Deductions & Write-offs (2,626) (2,320) (1,871)
Balance at End of Year 601 730 827
Valuation Allowance on Deferred Tax Asset [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 26,763 27,102 27,497
Additions Charged to Other Accounts 113    
Deductions & Write-offs (20,749) (339) (395)
Balance at End of Year $ 6,127 $ 26,763 $ 27,102