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Acquisition - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Alter Power Systems [Member]
Mar. 12, 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 2,058    2,058  
Cash acquired from acquisition     21  
Remaining cash to be paid     368  
Holdback provisions paid     $ 123