Summary of Company's Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 85,246	$ 82,320
Current portion	(19,519)	(21,439)
Long-term debt, less current maturities	65,727	60,881
US Term Note
Debt Instrument [Line Items]
Interest Rate	1.90%
Total debt	21,875	24,500
US Revolving Note
Debt Instrument [Line Items]
Interest Rate	3.47%
Total debt	14,082
Europe Term Note
Debt Instrument [Line Items]
Interest Rate	1.89%
Total debt	35,493	38,899
W.E.T. Term Note
Debt Instrument [Line Items]
Interest Rate	1.89%
Total debt	6,750	10,920
DEG Loan
Debt Instrument [Line Items]
Interest Rate	4.25%
Total debt	5,477	5,561
Capital Leases
Debt Instrument [Line Items]
Interest Rate	4.20%
Total debt	$ 1,569	$ 2,440