Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investment in Affiliate - Summary of Operating Results of EnergySource (Detail)

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Equity Method Investment in Affiliate - Summary of Operating Results of EnergySource (Detail) (HA EnergySource [Member], Predecessor [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2012
HA EnergySource [Member] | Predecessor [Member]
 
Quarterly Operating Results Unaudited [Line Items]  
Total revenues $ 1.5
Total expenses 2.2
Net loss $ (0.7)