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Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Alter Power Systems [Member] |  |
Debt [Line Items] |  |
Number of financial institutions for available lines of credit and borrowing arrangements | 4 |
Maturity dates of financial institutions | 2013 through 2015 |
Japan line of credit [Member] |  |
Debt [Line Items] |  |
Number of financial institutions for available lines of credit and borrowing arrangements | 2 |
Aggregate borrowings expire and renewed | 3 month intervals |
Aggregate borrowings | $ 24,424 |
Debt instrument maximum interest rate | 0.63% |
Debt instrument minimum interest rate | 1.475% |
Total borrowings outstanding | 0 | 0
Plasmart line of credit [Member] |  |
Debt [Line Items] |  |
Aggregate borrowings | 1,349 |
Total borrowings outstanding | 0 | 0
Average interest rate on borrowings | 5.19% |
Line of credit facility expiration year | 2014 |
Lines of credit [Member] | Alter Power Systems [Member] |  |
Debt [Line Items] |  |
Aggregate borrowings | 872 |
Lines of credit [Member] | Alter Power Systems [Member] | Minimum [Member] |  |
Debt [Line Items] |  |
Average interest rate on borrowings | 6.66% |
Lines of credit [Member] | Alter Power Systems [Member] | Maximum [Member] |  |
Debt [Line Items] |  |
Average interest rate on borrowings | 7.75% |
Term loan [Member] | Alter Power Systems [Member] |  |
Debt [Line Items] |  |
Aggregate borrowings | 564 |
Total borrowings outstanding | $ 791 |
Term loan [Member] | Alter Power Systems [Member] | Minimum [Member] |  |
Debt [Line Items] |  |
Average interest rate on borrowings | 1.34% |
Term loan [Member] | Alter Power Systems [Member] | Maximum [Member] |  |
Debt [Line Items] |  |
Average interest rate on borrowings | 4.23% |

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- Definition Debt Instrument Date Of Maturity + References No definition available. + Details
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- Details
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- Definition Line Of Credit Facility Expiration Year + References No definition available. + Details
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- Definition General renewal period for line of credit facility. + References No definition available. + Details
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- Definition Number of financial institutions for lines of credit and borrowing arrangements. + References No definition available. + Details
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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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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- 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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