Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Account for Accounts Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 669	$ 1,560	$ 1,459
Charged to Costs and Expenses	373	0	343
Deductions / (Recoveries)	589	891	242
Balance at End of Period	453	669	1,560
Valuation Accounts for Inventories [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	13,655	14,710	9,837
Charged to Costs and Expenses	8,473	6,758	8,762
Deductions / (Recoveries)	9,567	7,813	3,889
Balance at End of Period	$ 12,561	$ 13,655	$ 14,710