Summary of Significant Accounting Policies - Components of Other Expense, Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Regulatory Assets [Abstract]
Interest income	$ (2)	$ (6)	$ (5)
Interest expense			10
Loss on foreign exchange transactions	94	73	122
Other expense, net	$ 92	$ 67	$ 127