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Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment by Classification (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Public Utilities, Allowance for Funds Used During Construction, Description | 1869586 |
Property, plant and equipment |  |
Total property, plant and equipment | $ 1,569,683 | $ 1,312,117
Less: Accumulated depreciation and amortization | (294,295) | (270,599)
Plus: Construction work in progress | 108,584 | 84,509
Net property, plant and equipment | 1,383,972 | 1,126,027
Natural Gas Distribution [Member] | Delmarva and Florida [Member] |  |
Property, plant and equipment |  |
Total property, plant and equipment | 657,630 | 589,149
Natural Gas Transmission [Member] | Delmarva Peninsula, Pennsylvania and Florida [Member] |  |
Property, plant and equipment |  |
Total property, plant and equipment | 537,654 | 384,360
Natural Gas Transmission [Member] | OHIO |  |
Property, plant and equipment |  |
Total property, plant and equipment | 70,225 | 66,037
Electric distribution | Florida |  |
Property, plant and equipment |  |
Total property, plant and equipment | 102,133 | 100,227
Propane Operations [Member] | Mid-Atlantic and Florida [Member] |  |
Property, plant and equipment |  |
Total property, plant and equipment | 123,632 | 108,177
Electricity and Steam Generation [Member] | Florida |  |
Property, plant and equipment |  |
Total property, plant and equipment | 35,239 | 35,239
Mobile CNG Utility and Pipeline Solutions [Member] | Florida |  |
Property, plant and equipment |  |
Total property, plant and equipment | 7,240 | 0
Other unregulated energy | Other [Member] |  |
Property, plant and equipment |  |
Total property, plant and equipment | 1,346 | 1,229
Other |  |
Property, plant and equipment |  |
Total property, plant and equipment | $ 34,584 | $ 27,699

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