Interest Expense and Other Income (Expense) - Components of Other Income (Expense) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of Other Income Expense [Line Items]
Other income (expense)	$ 195	$ 86	$ 401	$ 439
CSV income [Member]
Components of Other Income Expense [Line Items]
Other income (expense)	235	106	339	564
Foreign exchange expense [Member]
Components of Other Income Expense [Line Items]
Other income (expense)	(17)	(9)	(33)	(106)
Other - net [Member]
Components of Other Income Expense [Line Items]
Other income (expense)	$ (23)	$ (11)	$ 95	$ (19)