Summary of Company's debt (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total debt	$ 82,320	$ 56,952
Current portion	(21,439)	(17,218)
Long-term debt, less current maturities	60,881	39,734
US Term Note
Debt Instrument [Line Items]
Total debt	24,500	29,312
Interest Rate	2.50%	2.06%
Europe Term Note
Debt Instrument [Line Items]
Total debt	38,899	4,476
Interest Rate	2.49%	1.80%
W.E.T. Term Note
Debt Instrument [Line Items]
Total debt	10,920	18,852
Interest Rate	2.01%	2.00%
DEG Loan
Debt Instrument [Line Items]
Total debt	5,561	3,172
Interest Rate	4.25%	6.90%
Capital Leases
Debt Instrument [Line Items]
Total debt	$ 2,440	$ 1,140
Interest Rate	4.20%	5.50%