Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investment in Affiliate - Summary of Financial Position of EnergySource (Detail)

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Equity Method Investment in Affiliate - Summary of Financial Position of EnergySource (Detail) (HA EnergySource [Member], Predecessor [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
HA EnergySource [Member] | Predecessor [Member]
 
Balance Sheet Components [Line Items]  
Total assets $ 10.0
Members' capital $ (5.1)