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Rates and Other Regulatory Activities - Additional Information (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 DTH | May 14, 2012 Eastern Shore Mainline Expansion Project [Member] | Jan. 30, 2012 Florida [Member] | Nov. 30, 2009 Florida [Member] | Dec. 31, 2012 Florida [Member] Customer mi | Dec. 31, 2011 Florida [Member] | Dec. 31, 2012 Eastern Shore Gas Company [Member] DTH | Dec. 31, 2011 Eastern Shore Gas Company [Member] | Dec. 31, 2012 Eastern Shore Gas Company [Member] Eastern Shore Mainline Expansion Project [Member] DTH | May 14, 2012 Eastern Shore Gas Company [Member] Eastern Shore Mainline Expansion Project [Member]
Investment In Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Inclusion of acquisition adjustment |  |  | $ 34,200,000 |  |  |  |  |  |  |
Costs related to mergers |  |  | 2,200,000 |  |  |  |  |  |  |
Amortization period of merger cost |  |  | 30 years | 5 years |  |  |  |  |  |
Regulatory asset which represents portion of the goodwill allowed to be recovered in future rates after the effective date of the Florida PSC order |  |  |  |  |  | 31,700,000 |  |  |  |
Regulatory asset related to the gross-up of the acquisition adjustment for income tax |  |  |  |  | 349,000 | 18,100,000 |  |  |  |
Portion of the merger-related costs allowed to be recovered in future rates after the effective date |  |  |  |  |  | 1,300,000 |  |  |  |
Amortization expense in depreciation and amortization in the accompanying of income condensed consolidated statement |  |  |  |  | 2,400,000 |  |  |  |  |
Amortization expense related to assets |  |  |  |  | 2,400,000 |  |  |  |  |
Net of tax year one |  |  |  |  | 1,400,000 |  |  |  |  |
Amortization of acquired intangible assets year two |  |  |  |  | 2,300,000 |  |  |  |  |
Net of tax year two |  |  |  |  | 1,400,000 |  |  |  |  |
Amortization of acquired intangible assets year three |  |  |  |  | 1,800,000 |  |  |  |  |
Net of tax year three |  |  |  |  | 1,100,000 |  |  |  |  |
Expected percentage owned pipeline under the agreement |  |  |  |  | 45.00% |  |  |  |  |
Joint construction, ownership and operation of a pipeline extension |  |  |  |  | 16 |  |  |  |  |
Estimated project cost of pipeline |  |  |  |  | 5,800,000 |  |  |  |  |
Annual charge of new jointly-owned pipeline |  |  |  |  | 800,000 |  |  |  |  |
Annual charge to provide transmission service |  |  |  |  | 2,100,000 |  |  |  |  |
Period to replace qualifying mains and services | 10 years |  |  |  | 10 years |  |  |  |  |
Duration of right to give notice to FPU |  |  |  |  | 180 days |  |  |  |  |
Duration of closing of the purchase |  |  |  |  | 12 months |  |  |  |  |
Loss of earnings generated by FPU from number of customers |  |  |  |  | 3,000 |  |  |  |  |
Period of current agreement exceeds |  |  |  |  | 2 years |  |  |  |  |
Expiration date |  |  |  |  | Dec. 31, 2019 |  |  |  |  |
Amortization period of regulatory asset |  |  |  |  | Five |  |  |  |  |
Litigation expense |  |  |  |  | 1,400,000 |  |  |  |  |
Cost incurred | 75,000,000 |  |  |  |  |  |  |  |  |
Reduction in depreciation due to change in depreciation rates |  |  |  |  | 227,000 |  |  |  |  |
Regulatory liabilities contingency gain |  |  |  |  | 1,900,000 |  |  |  |  |
Tax contingency gain on regulatory liabilities |  |  |  |  | 1,200,000 |  |  |  |  |
Regulatory liabilities gross up tax |  |  |  |  | 748,000 |  |  |  |  |
Annual cost of service |  |  |  |  |  |  | 29,100,000 |  |  |
Pre-tax return |  |  |  |  |  |  | 13.90% |  |  |
Number of dekatherms per day |  |  |  |  |  |  | 15,000 |  |  |
Regulatory liability related to the refund due to customers as a result of the settlement |  |  |  |  |  |  |  | 1,300,000 |  |
Approval for volume of additional firm service to construct own and operate the facilities |  |  |  |  |  |  |  |  | 15,040 |
Estimated capital cost of Mainline Expansion Project |  | 16,300,000 |  |  |  |  |  |  |  |
Extension requested by protesting non-profit organization for public review and comment |  |  |  |  |  |  |  |  |  | 60 days
Additional firm transportation service capacity | 17,500 |  |  |  |  |  |  |  |  |
Estimated capital costs of project |  |  |  |  |  |  | 12,100,000 |  |  |
Filing period for fuel retention percentage and cash out surcharge |  |  |  |  |  |  | 24 months |  |  |
Amount of refund to eligible customers | $ 320,000 |  |  |  |  |  |  |  |  |

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