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Business Combinations - Additional Information (Detail) (Australian Electricity [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Australian Electricity [Member]
     
Business Acquisition [Line Items]      
Acquisition of outstanding equity   $ 6.3  
Business combination working capital adjustment   0.5  
Cost of Acquisition of subsidiaries and other assets   1.8  
Additional earn-out consideration payment as of purchase price     1.1
liability additional contingent consideration paid $ 0.4 $ 0.4