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Significant Segment Financial Data (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues $ 109,800,000 $ 72,500,000 $ 66,400,000 $ 118,200,000 $ 98,800,000 $ 71,300,000 $ 68,800,000 $ 114,200,000 $ 366,900,000 $ 353,100,000 $ 352,800,000
Interest Income                 3,200,000 4,200,000 1,600,000
Interest Expense                 22,000,000 22,300,000 22,000,000
Depreciation & Amortization Expense                 37,700,000 35,100,000 29,300,000
Income Tax Expense                 12,652,000 10,976,000 10,025,000
Segment Profit 10,300,000 600,000 (100,000) 10,800,000 9,000,000 500,000 (400,000) 9,000,000 21,600,000 18,100,000 16,300,000
Segment Assets 920,600,000       892,300,000       920,600,000 892,300,000 856,100,000
Capital Expenditures                 89,500,000 68,500,000 57,100,000
Gas Segment
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 170,400,000 160,600,000 159,200,000
Interest Income                 500,000 800,000 500,000
Interest Expense                 11,000,000 11,100,000 10,700,000
Depreciation & Amortization Expense                 17,200,000 15,700,000 13,600,000
Income Tax Expense                 7,500 5,800 4,300
Segment Profit                 12,500,000 8,900,000 6,700,000
Segment Assets 502,300,000       471,700,000       502,300,000 471,700,000 442,200,000
Capital Expenditures                 61,100,000 43,900,000 33,600,000
Electricity
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 190,700,000 187,000,000 188,100,000
Interest Income                 2,200,000 2,900,000 900,000
Interest Expense                 9,500,000 9,500,000 9,600,000
Depreciation & Amortization Expense                 19,500,000 18,000,000 14,200,000
Income Tax Expense                 5,100 4,800 5,200
Segment Profit                 7,600,000 7,600,000 7,800,000
Segment Assets 402,800,000       409,300,000       402,800,000 409,300,000 401,900,000
Capital Expenditures                 23,600,000 21,200,000 20,300,000
Unregulated Operation
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 5,800,000 5,500,000 5,500,000
Interest Income                 100,000 100,000 100,000
Income Tax Expense                 800 900 1,100
Segment Profit                 1,200,000 1,300,000 1,700,000
Segment Assets 6,200,000       5,700,000       6,200,000 5,700,000 5,500,000
All Other Segments
                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Interest Income                 400,000 400,000 100,000
Interest Expense                 1,500,000 1,700,000 1,700,000
Depreciation & Amortization Expense                 1,000,000 1,400,000 1,500,000
Income Tax Expense                 (700) (500) (600)
Segment Profit                 300,000 300,000 100,000
Segment Assets 9,300,000       5,600,000       9,300,000 5,600,000 6,500,000
Capital Expenditures                 $ 4,800,000 $ 3,400,000 $ 3,200,000