Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	$ 337	$ 499	$ 1,578
Provision (benefit) charged to selling, general and administrative expense	185	(61)	(535)
Write-offs, net of recoveries of amounts previously reserved	(162)	(102)	(494)
Exchange rate changes	14	1	(50)
Balance at end of year	$ 374	$ 337	$ 499