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Deferred Tax Assets and Liabilities, Non Current (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Utility Plant Differences	$ 66,907,000	$ 57,809,000
Net Operating Loss Carryforwards	(8,521,000)	(11,656,000)
AMT Tax Credit Carryforwards	(1,538,000)	(1,366,000)
Regulatory Assets and Liabilities	17,872,000	23,269,000
Retirement Benefit Obligations	(38,644,000)	(33,591,000)
Other, net	2,606,000	2,829,000
Total Noncurrent Deferred Income Tax Liabilities	$ 38,700,000	$ 37,300,000

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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