Schedule II - Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts [Member], 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]
Beginning of Period	$ 134	$ 21	$ 97
Costs and Expenses	8	113	(71)
Deductions/Write-offs	133	0	5
End of Period	$ 9	$ 134	$ 21