Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Balance at beginning of year	$ 1,678	$ 500
Additions based on tax position related to current year	67	63
Additions based on tax positions related to prior year	413
Amount acquired with W.E.T Acquisition		1,216
Effect of foreign currency translation	33	(101)
Balance at end of year	$ 2,191	$ 1,678