Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reserve for Uncollectible Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,131	$ 1,240	$ 1,235
Charged to Costs and Expenses	286	63	173
Charged to Other Accounts
Deductions	(77)	(184)	(154)
Other	14	12	(14)
Balance at End of Period	1,354	1,131	1,240
Reserve for Excess and Obsolete Inventory [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	3,414	4,359	5,052
Charged to Costs and Expenses	2,368	949	1,078
Charged to Other Accounts
Deductions	(1,009)	(1,924)	(1,688)
Other	120	30	(83)
Balance at End of Period	4,893	3,414	4,359
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	1,489	3,400	373
Charged to Costs and Expenses	642	546	3,027
Charged to Other Accounts
Deductions	(373)	(2,457)
Balance at End of Period	$ 1,758	$ 1,489	$ 3,400