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Debt - Additional Information (Detail) | 12 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  |  |  |  | 12 Months Ended | 1 Months Ended |  |  |  |
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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%

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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