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Provisions for Federal and State Income Taxes (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Federal Tax Provision (Benefit)      
Current Federal Tax Provision (Benefit)         
Deferred Federal Tax Provision (Benefit)      
Deferred Federal Tax Provision (Benefit) 10,052,000 9,085,000 7,976,000
Total Federal Tax Provision 10,052,000 9,085,000 7,976,000
State      
Current 386,000 132,000 1,358,000
Deferred 2,214,000 1,759,000 691,000
Total State Tax Provision 2,600,000 1,891,000 2,049,000
Total Provision for Federal and State Income Taxes 12,652,000 10,976,000 10,025,000
Current Benefit of Operating Loss Carrybacks
      
Current Federal Tax Provision (Benefit)      
Current Federal Tax Provision (Benefit)         
Utility Plant Differences
      
Deferred Federal Tax Provision (Benefit)      
Deferred Federal Tax Provision (Benefit) 28,907,000 6,019,000 13,002,000
Net Operating Loss Carryforwards
      
Deferred Federal Tax Provision (Benefit)      
Deferred Federal Tax Provision (Benefit) (8,053,000) 2,835,000 (4,844,000)
Regulatory Assets and Liabilities
      
Deferred Federal Tax Provision (Benefit)      
Deferred Federal Tax Provision (Benefit) (11,483,000) 472,000 513,000
Other, net
      
Deferred Federal Tax Provision (Benefit)      
Deferred Federal Tax Provision (Benefit) $ 681,000 $ (241,000) $ (695,000)