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
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 519	$ 141	$ 176
Charged to Costs and Expenses	33	379	6
Charged to Other Accounts	0	0	0
Deductions	(3)	(4)	(41)
Other	2	3	0
Balance at End of Period	551	519	141
Valuation Allowance Against Gross Deferred Income Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	2,887	3,042	1,853
Charged to Costs and Expenses	0	0	0
Charged to Other Accounts	35	11	1,368
Deductions	(156)	(132)	(178)
Other	(127)	(34)	(1)
Balance at End of Period	$ 2,639	$ 2,887	$ 3,042