Accounts Receivable - Schedule of Changes in Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance	$ (529)	$ (462)
Allowance for doubtful accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	(462)	(609)
Bad debt expense	(30)	146
Write off
Translation adjustments	(37)	1
Ending balance	$ (529)	$ (462)