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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2013
Jan. 31, 2012
Apr. 30, 2013
Australian Electricity Systems PTY Ltd [Member]
Mar. 31, 2013
Forma Line Industries CC [Member]
Business Acquisition, Contingent Consideration [Line Items]        
Fair value liabilities Level 2 $ 0      
Additional earn-out consideration payment   1,200,000    
Accrued liability additional earn out consideration payment     $ 400,000 $ 100,000
Period of earn-out contingent consideration       1 year