Summarizes Company's debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 US Term Note	Dec. 31, 2011 US Term Note	Dec. 31, 2012 Europe Term Note	Dec. 31, 2011 Europe Term Note	Dec. 31, 2012 W.E.T. Term Note	Dec. 31, 2011 W.E.T. Term Note	Dec. 31, 2012 Bank Of China	Sep. 11, 2012 Bank Of China	Dec. 31, 2012 Capital Lease Obligations	Dec. 31, 2011 Capital Lease Obligations
Debt Instrument [Line Items]
Interest Rate			2.06%	3.58%	1.80%	4.32%	2.00%	4.09%	6.90%	6.90%	5.50%	5.50%
Total debt	$ 56,952	$ 76,247	$ 29,312	$ 33,250	$ 4,476	$ 4,389	$ 18,852	$ 34,903	$ 3,172		$ 1,140	$ 3,705
Current portion	(17,218)	(14,570)
Long-term debt, less current maturities	$ 39,734	$ 61,677