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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended
May 24, 2012
Sep. 30, 2013
Jan. 31, 2012
May 24, 2012
Maximum [Member]
May 24, 2012
Minimum [Member]
Apr. 30, 2013
Australian Electricity Systems PTY Ltd [Member]
Mar. 31, 2013
Forma Line Industries CC [Member]
Business Acquisition, Contingent Consideration [Line Items]              
Increase in credit facility $ 90,000,000            
Carrying interest rate       LIBOR plus 1.25% LIBOR plus 1.125%    
Interest rate       1.25% 1.125%    
Expiration date of credit facility Jan. 01, 2015            
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