Debt - Additional Information (Detail) In Thousands, unless otherwise specified	9 Months Ended			9 Months Ended											9 Months Ended		1 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2013 EUR (€)	Feb. 28, 2013 Europe Term Note USD ($)	Sep. 30, 2013 W.E.T. Bank of America credit facility	Sep. 30, 2013 W.E.T. Bank of America credit facility Minimum	Sep. 30, 2013 Eurocurrency Rate Loans	Sep. 30, 2013 Eurocurrency Rate Loans Minimum	Sep. 30, 2013 Eurocurrency Rate Loans Maximum	Sep. 30, 2013 Federal Funds Rate Minimum	Sep. 30, 2013 Federal Funds Rate Maximum	Sep. 30, 2013 US Bank of America credit facility Maximum	Sep. 30, 2013 Base Rate Loans	Sep. 30, 2012 Bank of China USD ($)	Sep. 30, 2012 Bank of China CNY	Sep. 30, 2013 German Investment Corporation USD ($)	Sep. 30, 2013 German Investment Corporation EUR (€)	Sep. 30, 2013 German Investment Corporation Euro Swap Rate
Debt Disclosure [Line Items]
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 EURIBOR) rate (“Eurocurrency Rate Loans”) (0.17% – 0.45% at September 30, 2013) 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 EURIBOR) rate (“Eurocurrency Rate Loans”) (0.17% – 0.45% at September 30, 2013) 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%	2.25%	0.20%	0.40%	0.06%	0.50%	3.25%	1.25%			4.25%	4.25%	3.00%
Amount of draw on europe term note			$ 40,441
Debt instrument face amount													3,159	20,000
Fixed interest rate													6.90%	6.90%
Initial amount drawn from German Investment Corporation															2,601	2,000
Line of credit facility	29,550	20,000													2,701	2,000
Spread variable interest rate																	1.25%
Outstanding letter of credit	$ 450