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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

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