Debt - Additional Information (Detail)	12 Months Ended		0 Months Ended		1 Months Ended							12 Months Ended									1 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 EUR (€)	Dec. 17, 2012 Europe Term Note	Dec. 15, 2012 Europe Term Note	May 16, 2012 Europe Term Note USD ($)	Dec. 31, 2012 Europe Term Note	Dec. 31, 2011 Europe Term Note	Dec. 17, 2012 US Revolving Note [Member] USD ($)	Dec. 15, 2012 US Revolving Note [Member] USD ($)	Dec. 17, 2012 Wet Revolving Note [Member] EUR (€)	Dec. 15, 2012 Wet Revolving Note [Member] EUR (€)	Dec. 31, 2012 W.E.T. Bank of America credit facility	Dec. 31, 2012 W.E.T. Bank of America credit facility Minimum [Member]	Dec. 31, 2012 Eurocurrency Rate Loans	Dec. 31, 2012 Eurocurrency Rate Loans Minimum [Member]	Dec. 31, 2012 Eurocurrency Rate Loans Maximum [Member]	Dec. 31, 2012 Federal Funds Rate Minimum [Member]	Dec. 31, 2012 Federal Funds Rate Maximum [Member]	Dec. 31, 2012 US Bank of America credit facility [Member] Maximum [Member]	Dec. 31, 2012 Base Rate Loans	May 16, 2012 W.E.T. Term Note USD ($)	Dec. 31, 2012 W.E.T. Term Note	Dec. 31, 2011 W.E.T. Term Note	Dec. 31, 2012 Bank Of China	Sep. 11, 2012 Bank Of China USD ($)	Sep. 11, 2012 Bank Of China CNY
Debt Disclosure [Line Items]
Pay down of outstanding indebtedness					$ 8,237,000																$ 6,353,000
Maturity date			Jun. 30, 2014	Jan. 01, 2013
Line of credit maximum borrowing capacity								30,000,000	25,000,000	20,000,000	10,000,000
Principal amortization of credit facility percentage year one	10.00%	10.00%
Principal amortization of credit facility percentage year two	12.50%	12.50%
Principal amortization of credit facility percentage year three	15.00%	15.00%
Principal amortization of credit facility percentage year four	17.50%	17.50%
Principal amortization of credit facility percentage year five	10.00%	10.00%
Quarterly principal payments												20.00%
Credit facility due date	Mar. 30, 2016	Mar. 30, 2016
Debt instrument, description	The Company has the option to elect interest rates based on either a Eurocurrency (LIBOR or EUIBOR) rate ("Eurocurrency Rate Loans") (0.20% - 0.40% at December 31, 2012) or a base rate ("Base Rate Loans") plus a margin ("Applicable Rate"), which varies based on the Consolidated Leverage Ratio of the Company, as defined by the US and W.E.T. Bank of America credit agreements.	The Company has the option to elect interest rates based on either a Eurocurrency (LIBOR or EUIBOR) rate ("Eurocurrency Rate Loans") (0.20% - 0.40% at December 31, 2012) or a base rate ("Base Rate Loans") plus a margin ("Applicable Rate"), which varies based on the Consolidated Leverage Ratio of the Company, as defined by the US and W.E.T. Bank of America credit agreements.
Interest rate													1.00%	1.75%	0.20%	0.40%	0.09%	0.50%	3.25%	0.75%
Line of credit available amount	29,550,000	20,000,000
Outstanding Letter of Credit	450,000
Debt instrument face amount																									$ 3,159,000	20,000,000
Fixed interest rate						1.80%	4.32%															2.00%	4.09%	6.90%	6.90%	6.90%