Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 1,673	$ 2,219	$ 2,356
Additions Charged to Cost and Expenses		87		4
Other		28	20
Deductions		52	566	141
Balance at End of Period	$ 1,673	1,736	1,673	2,219
Inventory Reserve
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		100,779	102,896	116,016
Additions Charged to Cost and Expenses		15,244	11,242	8,844
Other		(85)	368	(126)
Deductions			13,727	21,838
Balance at End of Period	100,779	103,556	100,779	102,896
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	63,919	69,852	63,919	48,369
Additions Charged to Cost and Expenses		7,325	6,333	15,571
Deductions	400			21
Balance at End of Period	$ 69,852	$ 77,177	$ 69,852	$ 63,919