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Acquisition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 Alter Power Systems [Member] | Mar. 31, 2013 Alter Power Systems [Member] | Mar. 12, 2013 Alter Power Systems [Member] | Sep. 30, 2013 Alter Power Systems [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition purchase price, net of cash acquired |  |  |  |  | $ 2,426 |
Acquisition date |  |  |  |  |  | Mar. 12, 2013
Total cash paid, net of cash acquired | 2,326 | 24,385 | 2,058 | 2,426 | 2,426 |
Cash acquired from acquisition |  |  |  |  |  | 21
Remaining cash to be paid |  |  |  |  |  | 368
Holdback provisions paid |  |  |  |  |  | $ 123

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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