Summary of Company's Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 94,792	$ 82,320
Current portion	(4,816)	(21,439)
Long-term debt, less current maturities	89,976	60,881
US Term Note
Debt Instrument [Line Items]
Interest Rate	1.98%
Total debt	50,000
Europe Term Loan
Debt Instrument [Line Items]
Interest Rate	1.81%
Total debt	25,267
US Revolving Note
Debt Instrument [Line Items]
Interest Rate	3.00%
Total debt	13,419
US Term Note
Debt Instrument [Line Items]
Total debt		24,500
Europe Term Note
Debt Instrument [Line Items]
Total debt		38,899
W.E.T. Term Note
Debt Instrument [Line Items]
Total debt		10,920
DEG Loan
Debt Instrument [Line Items]
Interest Rate	4.25%
Total debt	5,053	5,561
Capital Leases
Debt Instrument [Line Items]
Interest Rate	4.20%
Total debt	$ 1,053	$ 2,440