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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended		9 Months Ended		1 Months Ended
	Aug. 31, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Aug. 31, 2013 Completed Technology [Member]	Jun. 30, 2013 Alter Power Systems [Member]	Mar. 31, 2013 Alter Power Systems [Member]	Mar. 12, 2013 Alter Power Systems [Member]	Mar. 31, 2013 Alter Power Systems [Member] Completed Technology [Member]	Mar. 31, 2013 Alter Power Systems [Member] Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition purchase price			$ 2,326	$ 24,385		$ 2,058	$ 2,426	$ 2,426
Completed technology of net assets	268	2,806			388
Intangible asset in connection with acquisition							$ 2,806		$ 2,208	$ 598

X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

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X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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