Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	$ 374	$ 337	$ 499
Provision (benefit) charged to selling, general and administrative expense	325	185	(61)
Allowance resulting from acquisition	117
Write-offs, net of recoveries of amounts previously reserved	(187)	(162)	(102)
Exchange rate changes	22	14	1
Balance at end of year	$ 651	$ 374	$ 337