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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