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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
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period     $ 19
Charged to costs & expenses $ 128    
Deductions     19
Balance at end of period 128    
Inventory Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 23,355 $ 25,249 26,675
Charged to costs & expenses 7,006 6,406 3,303
Deductions 352 8,300 4,729
Balance at end of period 30,009 23,355 25,249
Warranty Liability [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 9,724 8,548 8,739
Charged to costs & expenses 7,392 6,951 8,561
Deductions 8,493 5,775 8,752
Balance at end of period 8,623 9,724 8,548
Deferred Tax Asset Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 6,006 6,149 7,250
Charged to costs & expenses   18 69
Deductions 190 161 1,170
Balance at end of period $ 5,816 $ 6,006 $ 6,149