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Regulatory Assets Liabilities and Reclassification from Regulatory Assets Liabilities into Cost of Gas Sales (Detail) - Jun. 30, 2014 - USD ($)
$ in Millions
Total
Total
Natural Gas Options Contract    
Regulatory Assets [Line Items]    
Loss/(Gain) recognized in Regulatory Assets(Liabilities) $ 0.4 $ (0.5)
Gas Purchase Costs    
Regulatory Assets [Line Items]    
Loss/(Gain) Reclassified into unaudited Consolidated Statement of Earnings [1]   $ (0.9)
[1] These amounts are offset in the unaudited Consolidated Statements of Earnings with Accrued Revenue and therefore there is no effect on earnings.