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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 2,356 $ 2,407 $ 2,491
Additions Charged to Cost and Expenses 4    
Deductions 141 51 84
Balance at End of Period 2,219 2,356 2,407
Inventory Reserve      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 116,016 119,376 111,252
Additions Charged to Cost and Expenses 8,844 17,493 21,332
Other (126) 4,417 1,680
Deductions 21,838 25,270 14,888
Balance at End of Period 102,896 116,016 119,376
Valuation Allowance of Deferred Tax Assets      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 48,369 43,039 41,737
Additions Charged to Cost and Expenses 15,571 5,413 1,322
Deductions 21 83 20
Balance at End of Period $ 63,919 $ 48,369 $ 43,039