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Acquisition - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 1 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]
Business Acquisition [Line Items]          
Current assets         $ 1,053
Property and equipment         211
Intangible assets         2,806
Other assets         67
Total assets acquired         4,137
Debt (Note 11)         770
Deferred taxes and other liabilities         920
Total liabilities assumed         1,690
Total purchase price         2,447
Cash acquired         (21)
Total purchase price, net of cash acquired $ 2,326 $ 24,385 $ 2,058 $ 2,426 $ 2,426