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Provisions for Federal and State Income Taxes (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current Federal Tax Provision (Benefit)      
Current Benefit of Operating Loss Carrybacks     $ (6,026,000)
Total Current Federal Tax Provision (Benefit)     (6,026,000)
Deferred Federal Tax Provision (Benefit)      
Utility Plant Differences 6,019,000 13,002,000 11,821,000
Net Operating Loss Carryforwards 2,835,000 (4,844,000) (5,520,000)
Regulatory Assets and Liabilities 472,000 513,000 3,338,000
Other, net (241,000) (695,000) (480,000)
Total Deferred Federal Tax Provision (Benefit) 9,085,000 7,976,000 9,159,000
Total Federal Tax Provision 9,085,000 7,976,000 3,133,000
State      
Current 132,000 1,358,000 28,000
Deferred 1,759,000 691,000 1,303,000
Total State Tax Provision 1,891,000 2,049,000 1,331,000
Total Provision for Federal and State Income Taxes $ 11,000,000 $ 10,000,000 $ 4,500,000