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Significant Segment Financial Data (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | $ 72.5 | $ 71.3 | $ 257.1 | $ 254.3 |
Segment Profit (Loss) | 0.6 | 0.5 | 11.3 | 9.1 |
Capital Expenditures | 27.6 | 23.5 | 64.6 | 47.4 |
Segment Assets | 895.2 | 841.9 | 895.2 | 841.9 | 892.3
Electricity |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 52.1 | 49.5 | 140.9 | 143.0 |
Segment Profit (Loss) | 2.6 | 2.5 | 6.0 | 5.1 |
Capital Expenditures | 6.1 | 6.1 | 16.5 | 15.5 |
Segment Assets | 409.6 | 399.8 | 409.6 | 399.8 |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 18.9 | 20.3 | 111.8 | 107.2 |
Segment Profit (Loss) | (1.9) | (2.4) | 4.1 | 3.0 |
Capital Expenditures | 20.1 | 16.8 | 44.6 | 29.9 |
Segment Assets | 474.2 | 430.1 | 474.2 | 430.1 |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | (0.4) |  | 0.3 |  |
Capital Expenditures | 1.4 | 0.6 | 3.5 | 2.0 |
Segment Assets | 4.9 | 5.8 | 4.9 | 5.8 |
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 1.5 | 1.5 | 4.4 | 4.1 |
Segment Profit (Loss) | 0.3 | 0.4 | 0.9 | 1.0 |
Segment Assets | $ 6.5 | $ 6.2 | $ 6.5 | $ 6.2 |

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