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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 4,135 $ 3,909 $ 1,760
Additions Acquisition Beginning Balance     1,292
Additions Charged to Costs and Expenses 1,435 825 1,109
Additions Charged to Other Accounts     (66)
Deductions & Write-offs (327) (599) (186)
Balance at End of Year 5,243 4,135 3,909
Valuation Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,295 1,138 601
Additions Acquisition Beginning Balance     423
Additions Charged to Costs and Expenses 124 (142) 2,262
Deductions & Write-offs (386) 299 (2,148)
Balance at End of Year 1,033 1,295 1,138
Valuation Allowance on Deferred Tax Asset [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 13,629 12,527 6,127
Additions Acquisition Beginning Balance     3,769
Additions Charged to Costs and Expenses 4,825 1,603 2,719
Deductions & Write-offs (518) (501) (88)
Balance at End of Year $ 17,936 $ 13,629 $ 12,527