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Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 102,400 | $ 74,700 | $ 77,500 | $ 172,200 | $ 119,800 | $ 76,600 | $ 73,300 | $ 156,100 | $ 426,800 | $ 425,800 | $ 366,900
Interest Income |  |  |  |  |  |  |  |  | 1,900 | 1,300 | 3,200
Interest Expense |  |  |  |  |  |  |  |  | 23,800 | 22,200 | 22,000
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 45,700 | 42,100 | 38,500
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 15,443 | 13,995 | 12,652
Segment Profit | 9,300 | $ 1,700 | $ 1,700 | $ 13,600 | 9,400 | $ 1,600 | $ 1,100 | $ 12,600 | 26,300 | 24,700 | 21,600
Segment Assets | 1,046,400 |  |  |  | 1,000,200 |  |  |  | 1,046,400 | 1,000,200 | 920,600
Capital Expenditures |  |  |  |  |  |  |  |  | 103,900 | 92,600 | 89,500
Gas Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 202,600 | 201,400 | 170,400
Interest Income |  |  |  |  |  |  |  |  | 800 | 300 | 500
Interest Expense |  |  |  |  |  |  |  |  | 13,300 | 11,500 | 11,000
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 20,700 | 18,800 | 17,200
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 10,200 | 10,800 | 7,500
Segment Profit |  |  |  |  |  |  |  |  | 15,300 | 15,800 | 12,500
Segment Assets | 596,700 |  |  |  | 566,300 |  |  |  | 596,700 | 566,300 | 502,300
Capital Expenditures |  |  |  |  |  |  |  |  | 64,900 | 62,300 | 61,100
Electricity |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 218,000 | 218,700 | 190,700
Interest Income |  |  |  |  |  |  |  |  | 700 | 600 | 2,200
Interest Expense |  |  |  |  |  |  |  |  | 8,800 | 9,100 | 9,500
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 24,000 | 22,300 | 20,300
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 5,500 | 4,500 | 5,100
Segment Profit |  |  |  |  |  |  |  |  | 8,700 | 6,800 | 7,600
Segment Assets | 416,800 |  |  |  | 414,100 |  |  |  | 416,800 | 414,100 | 402,800
Capital Expenditures |  |  |  |  |  |  |  |  | 29,900 | 24,800 | 23,600
All Other Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Income |  |  |  |  |  |  |  |  | 300 | 300 | 400
Interest Expense |  |  |  |  |  |  |  |  | 1,700 | 1,600 | 1,500
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 900 | 1,000 | 1,000
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,100) | (1,900) | (700)
Segment Profit |  |  |  |  |  |  |  |  | 1,000 | 1,200 | 300
Segment Assets | 26,300 |  |  |  | 13,500 |  |  |  | 26,300 | 13,500 | 9,300
Capital Expenditures |  |  |  |  |  |  |  |  | 9,000 | 5,200 | 4,800
Unregulated Operation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,200 | 5,700 | 5,800
Interest Income |  |  |  |  |  |  |  |  | 100 | 100 | 100
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 100 |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 800 | 600 | 800
Segment Profit |  |  |  |  |  |  |  |  | 1,300 | 900 | 1,200
Segment Assets | $ 6,600 |  |  |  | $ 6,300 |  |  |  | 6,600 | 6,300 | $ 6,200
Capital Expenditures |  |  |  |  |  |  |  |  | $ 100 | $ 300 |

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