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Income Taxes - Schedule of Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current Income Tax Expense      
Federal $ 3,483 $ 0 $ 1,566
State 1,990 742 2,116
Investment tax credit adjustments, net (58) (73) (91)
Total current income tax expense 5,415 669 3,591
Deferred Income Tax Expense      
Total deferred income tax expense 13,881 17,320 13,332
Total income tax expense 19,296 17,989 16,923
Property, plant and equipment [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense 14,301 16,885 16,964
Deferred gas costs [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense 515 591 (2,505)
Pensions and other employee benefits [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense 553 786 (402)
FPU merger related premium cost and deferred gain [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense (509)   (13)
Amortization of intangibles [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense 80 17 (211)
Environmental expenditures [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense (82) (65) 32
Net operating loss carryforwards [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense 740 (1,000) 99
Reserve for insurance deductibles [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense   18 (419)
Other [Member]
      
Deferred Income Tax Expense      
Total deferred income tax expense $ (1,717) $ 88 $ (213)